/*
 * Copyright © 2022 Imagination Technologies Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include "pvr_device_info.h"
#include "pvr_pds.h"
#include "pvr_rogue_pds_defs.h"
#include "pvr_rogue_pds_disasm.h"
#include "pvr_rogue_pds_encode.h"
#include "pvr_types.h"
#include "util/log.h"
#include "util/macros.h"

#define R32_C(x) ((x) + PVR_ROGUE_PDSINST_REGS32_CONST32_LOWER)
#define R32_T(x) ((x) + PVR_ROGUE_PDSINST_REGS32_TEMP32_LOWER)
#define R32_P(x) ((x) + PVR_ROGUE_PDSINST_REGS32_PTEMP32_LOWER)

#define R32TP_T(x) ((x) + PVR_ROGUE_PDSINST_REGS32TP_TEMP32_LOWER)
#define R32TP_P(x) ((x) + PVR_ROGUE_PDSINST_REGS32TP_PTEMP32_LOWER)

#define R64_C(x) ((x) + PVR_ROGUE_PDSINST_REGS64_CONST64_LOWER)
#define R64_T(x) ((x) + PVR_ROGUE_PDSINST_REGS64_TEMP64_LOWER)
#define R64_P(x) ((x) + PVR_ROGUE_PDSINST_REGS64_PTEMP64_LOWER)

#define R64TP_T(x) ((x) + PVR_ROGUE_PDSINST_REGS64TP_TEMP64_LOWER)
#define R64TP_P(x) ((x) + PVR_ROGUE_PDSINST_REGS64TP_PTEMP64_LOWER)

/* 32-bit PTemp index for draw indirect base instance. */
#define PVR_INDIRECT_BASE_INSTANCE_PTEMP 1U

/* Number of constants to reserve per DDMAD instruction in the PDS Vertex. */
#define PVR_PDS_DDMAD_NUM_CONSTS 8

#if defined(TRACE_PDS)
/* Some macros for a pretty printing. */

#   define pvr_debug_pds_const(reg, size, annotation) \
      mesa_logd("const[%d]   @  (%dbits)  %s", reg, size, annotation)
#   define pvr_debug_pds_temp(reg, size, annotation) \
      mesa_logd("temp[%d]    @  (%dbits)  %s", reg, size, annotation)
#   define pvr_debug_pds_note(...) mesa_logd("              // " __VA_ARGS__)
#   define pvr_debug_pds_flag(flags, flag) \
      {                                    \
         if ((flags & flag) == flag)       \
            mesa_logd(" > " #flag);        \
      }
#   define pvr_debug(annotation) mesa_logd(annotation)

#else
#   define pvr_debug_pds_const(reg, size, annotation)
#   define pvr_debug_pds_temp(reg, size, annotation)
#   define pvr_debug_pds_note(...)
#   define pvr_debug_pds_flag(flags, flag)
#   define pvr_debug(annotation)
#endif

struct pvr_pds_const_map_entry_write_state {
   const struct pvr_pds_info *PDS_info;
   struct pvr_const_map_entry *entry;
   size_t size_of_last_entry_in_bytes;
   uint32_t entry_count;
   size_t entries_size_in_bytes;
};

static void pvr_init_pds_const_map_entry_write_state(
   struct pvr_pds_info *PDS_info,
   struct pvr_pds_const_map_entry_write_state *entry_write_state)
{
   entry_write_state->PDS_info = PDS_info;
   entry_write_state->entry = PDS_info->entries;
   entry_write_state->size_of_last_entry_in_bytes = 0;
   entry_write_state->entry_count = 0;
   entry_write_state->entries_size_in_bytes = 0;
}

/* Returns a pointer to the next struct pvr_const_map_entry. */
static void *pvr_prepare_next_pds_const_map_entry(
   struct pvr_pds_const_map_entry_write_state *entry_write_state,
   size_t size_of_next_entry_in_bytes)
{
   /* Move on to the next entry. */
   uint8_t *next_entry = ((uint8_t *)entry_write_state->entry +
                          entry_write_state->size_of_last_entry_in_bytes);
   entry_write_state->entry = (struct pvr_const_map_entry *)next_entry;

   entry_write_state->size_of_last_entry_in_bytes = size_of_next_entry_in_bytes;
   entry_write_state->entry_count++;
   entry_write_state->entries_size_in_bytes += size_of_next_entry_in_bytes;

   /* Check if we can write into the next entry. */
   assert(entry_write_state->entries_size_in_bytes <=
          entry_write_state->PDS_info->entries_size_in_bytes);

   return entry_write_state->entry;
}

static void pvr_write_pds_const_map_entry_vertex_attribute_address(
   struct pvr_pds_const_map_entry_write_state *entry_write_state,
   const struct pvr_pds_vertex_dma *DMA,
   uint32_t const_val,
   bool use_robust_vertex_fetch)
{
   pvr_debug_pds_note("DMA %d dwords, stride %d, offset %d, bindingIdx %d",
                      DMA->size_in_dwords,
                      DMA->stride,
                      DMA->offset,
                      DMA->binding_index);

   if (use_robust_vertex_fetch) {
      struct pvr_const_map_entry_robust_vertex_attribute_address
         *robust_attribute_entry;

      robust_attribute_entry =
         pvr_prepare_next_pds_const_map_entry(entry_write_state,
                                              sizeof(*robust_attribute_entry));
      robust_attribute_entry->type =
         PVR_PDS_CONST_MAP_ENTRY_TYPE_ROBUST_VERTEX_ATTRIBUTE_ADDRESS;
      robust_attribute_entry->const_offset = const_val;
      robust_attribute_entry->binding_index = DMA->binding_index;
      robust_attribute_entry->attrib_size_in_bytes = DMA->attrib_size_in_bytes;
      robust_attribute_entry->offset = DMA->offset;
      robust_attribute_entry->stride = DMA->stride;
      robust_attribute_entry->size_in_dwords = DMA->size_in_dwords;
      robust_attribute_entry->robustness_buffer_offset =
         DMA->robustness_buffer_offset;
   } else {
      struct pvr_const_map_entry_vertex_attribute_address *attribute_entry;

      attribute_entry =
         pvr_prepare_next_pds_const_map_entry(entry_write_state,
                                              sizeof(*attribute_entry));
      attribute_entry->type =
         PVR_PDS_CONST_MAP_ENTRY_TYPE_VERTEX_ATTRIBUTE_ADDRESS;
      attribute_entry->const_offset = const_val;
      attribute_entry->binding_index = DMA->binding_index;
      attribute_entry->offset = DMA->offset;
      attribute_entry->stride = DMA->stride;
      attribute_entry->size_in_dwords = DMA->size_in_dwords;
   }
}

static ALWAYS_INLINE uint32_t pvr_pds_encode_doutu(uint32_t cc,
                                                   uint32_t end,
                                                   uint32_t src0)
{
   return pvr_pds_inst_encode_dout(cc,
                                   end,
                                   0,
                                   src0,
                                   PVR_ROGUE_PDSINST_DSTDOUT_DOUTU);
}

static uint32_t
pvr_encode_burst(struct pvr_pds_const_map_entry_write_state *entry_write_state,
                 bool last_dma,
                 bool halt,
                 unsigned int const32,
                 unsigned int const64,
                 unsigned int dma_size_in_dwords,
                 unsigned int destination,
                 unsigned int store)
{
   uint32_t literal_value;

   /* Encode literal value. */
   literal_value = dma_size_in_dwords
                   << PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTD_SRC1_BSIZE_SHIFT;
   literal_value |= destination
                    << PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTD_SRC1_AO_SHIFT;
   literal_value |= PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTD_SRC1_CMODE_CACHED |
                    store;

   if (last_dma)
      literal_value |= PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTD_SRC1_LAST_EN;

   /* Create const map entry. */
   struct pvr_const_map_entry_literal32 *literal_entry;

   literal_entry = pvr_prepare_next_pds_const_map_entry(entry_write_state,
                                                        sizeof(*literal_entry));
   literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
   literal_entry->const_offset = const32;
   literal_entry->literal_value = literal_value;

   /* Encode DOUTD */
   return pvr_pds_inst_encode_dout(0,
                                   halt,
                                   R32_C(const32),
                                   R64_C(const64),
                                   PVR_ROGUE_PDSINST_DSTDOUT_DOUTD);
}

#define pvr_encode_burst_cs(psDataEntry,        \
                            last_dma,           \
                            halt,               \
                            const32,            \
                            const64,            \
                            dma_size_in_dwords, \
                            destination)        \
   pvr_encode_burst(                            \
      psDataEntry,                              \
      last_dma,                                 \
      halt,                                     \
      const32,                                  \
      const64,                                  \
      dma_size_in_dwords,                       \
      destination,                              \
      PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_COMMON_STORE)

static uint32_t pvr_encode_direct_write(
   struct pvr_pds_const_map_entry_write_state *entry_write_state,
   bool last_dma,
   bool halt,
   unsigned int const32,
   unsigned int const64,
   uint32_t data_mask,
   unsigned int destination,
   uint32_t destination_store,
   const struct pvr_device_info *dev_info)
{
   struct pvr_const_map_entry_literal32 *literal_entry;

   uint32_t instruction =
      pvr_pds_inst_encode_dout(0,
                               halt,
                               const32,
                               const64,
                               PVR_ROGUE_PDSINST_DSTDOUT_DOUTW);

   literal_entry = pvr_prepare_next_pds_const_map_entry(entry_write_state,
                                                        sizeof(*literal_entry));
   literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
   literal_entry->const_offset = const32;
   literal_entry->literal_value = destination_store;

   if (PVR_HAS_FEATURE(dev_info, slc_mcu_cache_controls)) {
      literal_entry->literal_value |=
         PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_CMODE_CACHED;
   }

   literal_entry->literal_value |=
      destination << PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_AO_SHIFT;

   if (data_mask == 0x1) {
      literal_entry->literal_value |=
         PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_BSIZE_LOWER;
   } else if (data_mask == 0x2) {
      literal_entry->literal_value |=
         PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_BSIZE_UPPER;
   } else {
      literal_entry->literal_value |=
         PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_BSIZE_ALL64;
   }

   if (last_dma) {
      literal_entry->literal_value |=
         PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_LAST_EN;
   }

   return instruction;
}

/* Constant and Temporary register allocation
 * - reserve space for a 32-bit register or a 64-bit register
 * - returned indices are offsets to 32-bit register locations
 * - 64-bit registers need to be aligned to even indices.
 */
#define RESERVE_32BIT 1U
#define RESERVE_64BIT 2U

#if MESA_DEBUG
#   define pvr_find_constant(usage, words, name) \
      pvr_find_constant2(usage, words, name)
#   define pvr_get_temps(usage, words, name) pvr_get_temps2(usage, words, name)
#else
#   define pvr_find_constant(usage, words, name) \
      pvr_find_constant2(usage, words, NULL);
#   define pvr_get_temps(usage, words, name) pvr_get_temps2(usage, words, NULL)
#endif

static uint32_t
pvr_find_constant2(uint8_t *const_usage, uint8_t words, const char *const_name)
{
   uint32_t const_index = ~0;
   uint32_t step = words;
   uint8_t mask = (1 << words) - 1;

   assert(words == 1 || words == 2);

   /* Find a register at 'step' alignment that satisfies the mask. */
   for (uint32_t i = 0; i < PVR_MAX_VERTEX_ATTRIB_DMAS; i++) {
      for (uint32_t b = 0; b < PVR_PDS_DDMAD_NUM_CONSTS; b += step) {
         if ((const_usage[i] & (mask << b)) != 0)
            continue;
         const_usage[i] |= (mask << b);
         const_index = i * 8 + b;
         pvr_debug_pds_const(const_index, words * 32, const_name);
         return const_index;
      }
   }

   UNREACHABLE("Unexpected: Space cannot be found for constant");
   return ~0;
}

#define PVR_MAX_PDS_TEMPS 32
struct pvr_temp_usage {
   uint32_t temp_usage;
   uint8_t temp_used;
   uint8_t temps_needed;
};

#define PVR_INVALID_TEMP UINT8_C(~0)

static uint8_t pvr_get_temps2(struct pvr_temp_usage *temps,
                              uint8_t temps_needed,
                              const char *temp_name)
{
   uint8_t step = temps_needed;
   uint8_t mask = (1 << temps_needed) - 1;

   assert(temps_needed == 1 || temps_needed == 2);
   assert(temps->temp_used + temps_needed <= PVR_MAX_PDS_TEMPS);

   for (uint8_t i = 0; i < PVR_MAX_PDS_TEMPS; i += step) {
      if ((temps->temp_usage & (mask << i)) != 0)
         continue;

      const size_t clzBits = 8 * sizeof(unsigned int);

      temps->temp_usage |= (mask << i);
      temps->temp_used += temps_needed;
      temps->temps_needed =
         clzBits - __builtin_clz((unsigned int)temps->temp_usage);

      pvr_debug_pds_temp(i, temps_needed * 32, temp_name);

      return i;
   }

   UNREACHABLE("Unexpected: Space cannot be found for temps");
   return PVR_INVALID_TEMP;
}

/**
 * Wrapper macro to add a toggle for "data mode", allowing us to calculate the
 * size of a PDS program without actually attempting to store it.
 *
 * \param dest The array/memory pointer where the PDS program should be stored.
 *             If the given code is NULL, automatically switch to count mode
 *             instead of attempting to fill in unallocated memory.
 * \param counter The local counter that holds the total instruction count.
 * \param statement What function call/value should be stored at dest[counter]
 *                  when condition is false.
 */

#define PVR_PDS_MODE_TOGGLE(dest, counter, statement) \
   if (!dest) {                                       \
      counter++;                                      \
   } else {                                           \
      dest[counter++] = statement;                    \
      PVR_PDS_PRINT_INST(statement);                  \
   }

/**
 * Generates the PDS vertex primary program for the dma's listed in the input
 * structure. Produces the constant map for the Vulkan driver based upon the
 * requirements of the instructions added to the program.
 *
 * PDS Data Layout
 * ---------------
 *
 * The PDS data is optimized for the DDMAD layout, with the data for those
 * instructions laid out first. The data required for other instructions is laid
 * out in the entries unused by the DDMADs.
 *
 * DDMAD layout
 * \verbatim
 * 	bank | index | usage
 * 	0    |  0:1  | temps (current index)[-]
 * 	2    |  2:3  | stride[32]
 * 	1    |  4:5  | base address[64]
 * 	3    |  6:7  | ctrl[64]
 * \endverbatim
 *
 *  Each DMA whose stride > 0 requires one entry, laid out as above. We stride
 * 	over the banks to ensure that each ddmad reads each of its operands from a
 * 	different bank (i.e. remove bank clashes)
 *
 * 	Note: This is "wasting" const[0:1] and const[2], however these free
 * 	registers will be used by other, non-ddmad instructions.
 *
 * 	The const register usage is maintained in the au8ConstUsage array, the
 * DDMAD instructions, for example, will utilize the top 5 registers in each
 * block of 8 hence a 'usage mask' of 0xF8 (0b11111000).
 *
 * 	Constant Map
 * 	------------
 *
 * 	The constant map is built up as we add PDS instructions and passed back
 * for the driver to fill in the PDS data section with the correct parameters
 * for each draw call.
 *
 * \param input_program PDS Program description.
 * \param code Buffer to be filled in with the PDS program. If NULL is provided,
 *             automatically switch to count-mode, preventing writes to
 *             unallocated memory.
 * \param info PDS info structure filled in for the driver, contains the
 *             constant map.
 * \param use_robust_vertex_fetch Do vertex fetches apply range checking.
 * \param dev_info pvr device information struct.
 */
void pvr_pds_generate_vertex_primary_program(
   struct pvr_pds_vertex_primary_program_input *input_program,
   uint32_t *code,
   struct pvr_pds_info *info,
   bool use_robust_vertex_fetch,
   const struct pvr_device_info *dev_info)
{
   struct pvr_pds_const_map_entry_write_state entry_write_state;
   struct pvr_const_map_entry_doutu_address *doutu_address_entry;

   uint32_t instruction = 0; /* index into code */
   uint32_t index; /* index used for current attribute, either vertex or
                    * instance.
                    */

   uint32_t total_dma_count = 0;
   uint32_t running_dma_count = 0;

   uint32_t write_instance_control = ~0;
   uint32_t write_vertex_control = ~0;
   uint32_t write_base_instance_control = ~0;
   uint32_t write_base_vertex_control = ~0;
   uint32_t pvr_write_draw_index_control = ~0;
   uint32_t write_view_index_control = ~0;

   uint32_t ddmad_count = 0;
   uint32_t doutw_count = 0;

   uint32_t base_instance = 0;
   uint32_t base_vertex = 0;
   uint32_t draw_index = 0;

   uint8_t const_usage[PVR_MAX_VERTEX_ATTRIB_DMAS] = { 0 };

   struct pvr_temp_usage temp_usage = { 0 };

   uint32_t zero_temp = PVR_INVALID_TEMP;

   uint32_t max_index_temp = PVR_INVALID_TEMP;
   uint32_t current_index_temp = PVR_INVALID_TEMP;

   uint32_t index_id_temp = PVR_INVALID_TEMP;
   uint32_t base_instance_ID_temp = PVR_INVALID_TEMP;
   uint32_t instance_ID_temp = PVR_INVALID_TEMP;

   /* Debug tracing of program flags. */
   pvr_debug("pvr_pds_generate_vertex_primary_program");
   pvr_debug("=================================================");
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_VERTEX_ID_REQUIRED);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_INSTANCE_ID_REQUIRED);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_VARIANT);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_REQUIRED);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_BASE_VERTEX_REQUIRED);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_DRAW_INDEX_REQUIRED);
   pvr_debug_pds_flag(input_program->flags,
                      PVR_PDS_VERTEX_FLAGS_VIEW_INDEX_REQUIRED);
   pvr_debug(" ");

   pvr_init_pds_const_map_entry_write_state(info, &entry_write_state);

   /* At a minimum we need 2 dwords for the DOUTU, but since we allocate in
    * blocks of 4 we can reserve dwords for the instance/vertex DOUTW.
    */
   info->data_size_in_dwords = 4;

   /* Reserve 2 temps - these are automatically filled in by the VDM
    *
    * For instanced draw calls we manually increment the instance id by the
    * base-instance offset which is either provided as a constant, or in a
    * ptemp (for draw indirect)
    *
    * temp - contents
    * ---------------
    * 0    - index id (pre-filled)
    * 1    - base instance + instance id
    */
   index_id_temp = pvr_get_temps(&temp_usage, RESERVE_32BIT, "VDM Index id");
   instance_ID_temp =
      pvr_get_temps(&temp_usage, RESERVE_32BIT, "VDM Instance id");

   /* Reserve the lowest 2 dwords for DOUTU.
    * [------XX]
    */
   const_usage[0] = 0x03;

   /* Reserve consts for all the DDMAD's. */
   for (uint32_t dma = 0; dma < input_program->dma_count; dma++) {
      /* Mark the consts required by this ddmad "in-use".
       * [XXXXX---]
       */
      const_usage[ddmad_count++] |= 0xf8;
   }

   /* Start off by assuming we can fit everything in the 8 dwords/ddmad
    * footprint, if any DOUTD/DOUTW falls outside we will increase this
    * counter.
    */
   if (ddmad_count)
      info->data_size_in_dwords = PVR_PDS_DDMAD_NUM_CONSTS * ddmad_count;

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_VERTEX_ID_REQUIRED) {
      doutw_count++;
      write_vertex_control =
         pvr_find_constant(const_usage, RESERVE_32BIT, "Vertex id DOUTW Ctrl");
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_INSTANCE_ID_REQUIRED) {
      doutw_count++;
      write_instance_control = pvr_find_constant(const_usage,
                                                 RESERVE_32BIT,
                                                 "Instance id DOUTW Ctrl");
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_REQUIRED) {
      doutw_count++;
      write_base_instance_control =
         pvr_find_constant(const_usage,
                           RESERVE_32BIT,
                           "Base Instance DOUTW Ctrl");
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_BASE_VERTEX_REQUIRED) {
      doutw_count++;
      write_base_vertex_control = pvr_find_constant(const_usage,
                                                    RESERVE_32BIT,
                                                    "Base Vertex DOUTW Ctrl");

      /* Load base vertex from constant for non-indirect variants. */
      if ((input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) ==
          0) {
         struct pvr_const_map_entry_base_vertex *psBaseVertexEntry =
            (struct pvr_const_map_entry_base_vertex *)entry_write_state.entry;

         base_vertex =
            pvr_find_constant(const_usage, RESERVE_32BIT, "base_vertex");

         psBaseVertexEntry =
            pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                 sizeof(*psBaseVertexEntry));
         psBaseVertexEntry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_BASE_VERTEX;
         psBaseVertexEntry->const_offset = base_vertex;
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDEX_REQUIRED) {
      doutw_count++;
      pvr_write_draw_index_control =
         pvr_find_constant(const_usage, RESERVE_32BIT, "Draw Index DOUTW Ctrl");

      /* Set draw index to 0 for non-indirect variants. */
      if ((input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) ==
          0) {
         struct pvr_const_map_entry_literal32 *literal_entry;

         draw_index =
            pvr_find_constant(const_usage, RESERVE_32BIT, "draw_index");

         literal_entry =
            pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                 sizeof(*literal_entry));
         literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
         literal_entry->const_offset = draw_index;
         literal_entry->literal_value = 0;
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_VIEW_INDEX_REQUIRED) {
      doutw_count++;
      write_view_index_control =
         pvr_find_constant(const_usage, RESERVE_32BIT, "View index DOUTW Ctrl");
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
      /* Load absolute instance id into uiInstanceIdTemp. */
      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_pds_inst_encode_add32(
            /* cc    */ 0,
            /* alum  */ 0,
            /* sna   */ 0,
            /* src0  */ R32_P(PVR_INDIRECT_BASE_INSTANCE_PTEMP),
            /* src1  */ R32_T(instance_ID_temp),
            /* dst   */ R32TP_T(instance_ID_temp)));
   } else if (input_program->flags &
              PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_VARIANT) {
      struct pvr_const_map_entry_base_instance *base_instance_entry =
         (struct pvr_const_map_entry_base_instance *)entry_write_state.entry;

      base_instance =
         pvr_find_constant(const_usage, RESERVE_32BIT, "base_instance");

      PVR_PDS_MODE_TOGGLE(code,
                          instruction,
                          pvr_pds_inst_encode_add32(
                             /* cc    */ 0,
                             /* alum  */ 0,
                             /* sna   */ 0,
                             /* src0  */ R32_C(base_instance),
                             /* src1  */ R32_T(instance_ID_temp),
                             /* dst   */ R32TP_T(instance_ID_temp)));

      base_instance_entry =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*base_instance_entry));
      base_instance_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_BASE_INSTANCE;
      base_instance_entry->const_offset = base_instance;
   } else if (input_program->flags &
              PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_REQUIRED) {
      struct pvr_const_map_entry_base_instance *base_instance_entry =
         (struct pvr_const_map_entry_base_instance *)entry_write_state.entry;

      base_instance = pvr_find_constant(const_usage,
                                        RESERVE_32BIT,
                                        "base_instance (Driver Const)");

      /* Base instance provided by the driver. */
      base_instance_entry =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*base_instance_entry));
      base_instance_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_BASE_INSTANCE;
      base_instance_entry->const_offset = base_instance;
   }

   total_dma_count = ddmad_count;

   total_dma_count += doutw_count;

   if (use_robust_vertex_fetch) {
      pvr_debug_pds_note("RobustBufferVertexFetch Initialization");

      if (PVR_HAS_FEATURE(dev_info, pds_ddmadt)) {
         zero_temp = pvr_get_temps(&temp_usage, RESERVE_32BIT, "zero_temp");

         /* Load 0 into instance_ID_temp. */
         PVR_PDS_MODE_TOGGLE(code,
                             instruction,
                             pvr_pds_inst_encode_limm(0, /* cc */
                                                      zero_temp, /* SRC1 */
                                                      0, /* SRC0 */
                                                      0 /* GR */
                                                      ));
      } else {
         zero_temp = pvr_get_temps(&temp_usage, RESERVE_64BIT, "zero_temp");

         max_index_temp =
            pvr_get_temps(&temp_usage, RESERVE_64BIT, "uMaxIndex");
         current_index_temp =
            pvr_get_temps(&temp_usage, RESERVE_64BIT, "uCurrentIndex");

         PVR_PDS_MODE_TOGGLE(code,
                             instruction,
                             pvr_pds_inst_encode_sftlp64(
                                0, /* cc */
                                PVR_ROGUE_PDSINST_LOP_XOR, /* LOP */
                                1, /* IM */
                                R64TP_T(zero_temp >> 1), /* SRC0 (REGS64TP)
                                                          */
                                R64TP_T(zero_temp >> 1), /* SRC1 (REGS64TP)
                                                          */
                                0, /* SRC2 (REGS32) */
                                R64TP_T(zero_temp >> 1) /* DST (REG64TP) */
                                ));
         PVR_PDS_MODE_TOGGLE(code,
                             instruction,
                             pvr_pds_inst_encode_sftlp64(
                                0, /* cc */
                                PVR_ROGUE_PDSINST_LOP_NONE, /* LOP */
                                1, /* IM */
                                R64TP_T(zero_temp >> 1), /* SRC0 (REGS64TP)
                                                          */
                                0, /* SRC1 (REGS64TP) */
                                0, /* SRC2 (REGS32) */
                                R64TP_T(current_index_temp >> 1) /* DST */
                                /* (REG64TP) */
                                ));
         PVR_PDS_MODE_TOGGLE(code,
                             instruction,
                             pvr_pds_inst_encode_sftlp64(
                                0, /* cc */
                                PVR_ROGUE_PDSINST_LOP_NONE, /* LOP */
                                1, /* IM */
                                R64TP_T(zero_temp >> 1), /* SRC0 (REGS64TP)
                                                          */
                                0, /* SRC1 (REGS64TP) */
                                0, /* SRC2 (REGS32) */
                                R64TP_T(max_index_temp >> 1) /* DST */
                                /* (REG64TP) */
                                ));
      }
   }

   if (input_program->dma_count && use_robust_vertex_fetch) {
      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_pds_inst_encode_bra(PVR_ROGUE_PDSINST_PREDICATE_KEEP, /* SRCC */
                                 0, /* Neg */
                                 PVR_HAS_FEATURE(dev_info, pds_ddmadt)
                                    ? PVR_ROGUE_PDSINST_PREDICATE_OOB
                                    : PVR_ROGUE_PDSINST_PREDICATE_P0, /* SETC */
                                 1 /* Addr */
                                 ));
   }

   for (uint32_t dma = 0; dma < input_program->dma_count; dma++) {
      struct pvr_const_map_entry_vertex_attribute_stride *stride_entry;
      uint32_t const_base = dma * PVR_PDS_DDMAD_NUM_CONSTS;
      uint32_t control_word;
      struct pvr_const_map_entry_literal32 *literal_entry;

      const struct pvr_pds_vertex_dma *vertex_dma =
         &input_program->dma_list[dma];
      bool last_dma = (++running_dma_count == total_dma_count);

      pvr_debug_pds_note("Vertex Attribute DMA %d (last=%d)", dma, last_dma);

      /* The id we use to index into this dma. */
      if (vertex_dma->flags & PVR_PDS_VERTEX_DMA_FLAGS_INSTANCE_RATE) {
         pvr_debug_pds_note("Instance Rate (divisor = %d)",
                            vertex_dma->divisor);

         /* 4    - madd 0 - needs to be 64-bit aligned
          * 5    - madd 1
          */
         if (vertex_dma->divisor > 1) {
            const uint32_t adjusted_instance_ID_temp =
               pvr_get_temps(&temp_usage,
                             RESERVE_64BIT,
                             "adjusted_instance_ID_temp");
            const uint32_t MADD_temp =
               pvr_get_temps(&temp_usage, RESERVE_64BIT, "MADD_temp");

            /* 1. Remove base instance value from temp 1 to get instance id
             * 2. Divide the instance id by the divisor - Iout = (Iin *
             *    Multiplier) >> (shift+31)
             * 3. Add the base instance back on.
             *
             * Need two zero temps for the add part of the later MAD.
             */

            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_add64(
                                   /* cc    */ 0,
                                   /* alum  */ 0,
                                   /* sna   */ 1,
                                   /* src0  */ R64_T(MADD_temp >> 1),
                                   /* src1  */ R64_T(MADD_temp >> 1),
                                   /* dst   */ R64TP_T(MADD_temp >> 1)));

            if (input_program->flags &
                PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
               /* Subtract base instance from temp 1, put into
                * adjusted_instance_ID_temp.
                */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 1,
                     /* src0  */ R32_T(instance_ID_temp),
                     /* src1  */ R32_P(PVR_INDIRECT_BASE_INSTANCE_PTEMP),
                     /* dst   */ R32TP_T(adjusted_instance_ID_temp)));
            } else if (input_program->flags &
                       PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_VARIANT) {
               /* Subtract base instance from temp 1, put into
                * adjusted_instance_ID_temp.
                */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 1,
                     /* src0  */ R32_T(instance_ID_temp),
                     /* src1  */ R32_C(base_instance),
                     /* dst   */ R32TP_T(adjusted_instance_ID_temp)));
            } else {
               /* Copy instance from temp 1 to adjusted_instance_ID_temp.
                */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 0,
                     /* src0  */ R32_T(instance_ID_temp),
                     /* src1  */ R32_T(MADD_temp), /* MADD_temp is set
                                                    * to 0 at this point.
                                                    */
                     /* dst   */ R32TP_T(adjusted_instance_ID_temp)));
            }

            /* shift = the bit of the next highest power of two. */
            uint32_t shift_unsigned =
               (31 - __builtin_clz(vertex_dma->divisor - 1)) + 1;
            int32_t shift = (int32_t)shift_unsigned;
            uint32_t shift_2s_comp;

            pvr_debug_pds_note(
               "Perform instance rate divide (as integer multiply and rshift)");

            const uint32_t multipier_constant =
               pvr_find_constant(const_usage,
                                 RESERVE_32BIT,
                                 "MultiplierConstant (for InstanceDivisor)");

            /* multiplier = ( 2^(shift + 31) + (divisor - 1) ) / divisor,
               note: the division above is integer division. */
            uint64_t multipier64 =
               (uint64_t)((((uint64_t)1 << ((uint64_t)shift_unsigned + 31)) +
                           ((uint64_t)vertex_dma->divisor - (uint64_t)1)) /
                          (uint64_t)vertex_dma->divisor);
            uint32_t multiplier = (uint32_t)multipier64;

            pvr_debug_pds_note(" - Value of MultiplierConstant = %u",
                               multiplier);
            pvr_debug_pds_note(" - Value of Shift = %d", shift);

            literal_entry =
               pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                    sizeof(*literal_entry));
            literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
            literal_entry->const_offset = multipier_constant;
            literal_entry->literal_value = multiplier;

            /* (Iin * Multiplier) */
            PVR_PDS_MODE_TOGGLE(
               code,
               instruction,
               pvr_rogue_inst_encode_mad(0, /* Sign of add is positive */
                                         0, /* Unsigned ALU mode */
                                         0, /* Unconditional */
                                         R32_C(multipier_constant),
                                         R32_T(adjusted_instance_ID_temp),
                                         R64_T(MADD_temp / 2),
                                         R64TP_T(MADD_temp / 2)));

            /*  >> (shift + 31) */
            shift += 31;
            shift *= -1;

            if (shift < -31) {
               /* >> (31) */
               shift_2s_comp = 0xFFFE1;
               PVR_PDS_MODE_TOGGLE(code,
                                   instruction,
                                   pvr_pds_inst_encode_sftlp64(
                                      /* cc */ 0,
                                      /* LOP */ PVR_ROGUE_PDSINST_LOP_NONE,
                                      /* IM */ 1, /*  enable immediate */
                                      /* SRC0 */ R64_T(MADD_temp / 2),
                                      /* SRC1 */ 0, /* This won't be used
                                                       in a shift
                                                       operation. */
                                      /* SRC2 (Shift) */ shift_2s_comp,
                                      /* DST */ R64TP_T(MADD_temp / 2)));
               shift += 31;
            }

            /* >> (shift + 31) */
            shift_2s_comp = *((uint32_t *)&shift);
            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_sftlp64(
                                   /* cc */ 0,
                                   /* LOP */ PVR_ROGUE_PDSINST_LOP_NONE,
                                   /* IM */ 1, /*  enable immediate */
                                   /* SRC0 */ R64_T(MADD_temp / 2),
                                   /* SRC1 */ 0, /* This won't be used
                                                  * in a shift
                                                  * operation. */
                                   /* SRC2 (Shift) */ shift_2s_comp,
                                   /* DST */ R64TP_T(MADD_temp / 2)));

            if (input_program->flags &
                PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
               /* Add base instance. */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 0,
                     /* src0  */ R32_T(MADD_temp),
                     /* src1  */ R32_P(PVR_INDIRECT_BASE_INSTANCE_PTEMP),
                     /* dst   */ R32TP_T(MADD_temp)));
            } else if (input_program->flags &
                       PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_VARIANT) {
               /* Add base instance. */
               PVR_PDS_MODE_TOGGLE(code,
                                   instruction,
                                   pvr_pds_inst_encode_add32(
                                      /* cc    */ 0,
                                      /* alum  */ 0,
                                      /* sna   */ 0,
                                      /* src0  */ R32_T(MADD_temp),
                                      /* src1  */ R32_C(base_instance),
                                      /* dst   */ R32TP_T(MADD_temp)));
            }

            pvr_debug_pds_note(
               "DMA Vertex Index will be sourced from 'MADD_temp'");
            index = MADD_temp;
         } else if (vertex_dma->divisor == 0) {
            if (base_instance_ID_temp == PVR_INVALID_TEMP) {
               base_instance_ID_temp = pvr_get_temps(&temp_usage,
                                                     RESERVE_32BIT,
                                                     "uBaseInstanceIDTemp");
            }

            /* Load 0 into instance_ID_temp. */
            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_limm(
                                   /* cc       */ 0,
                                   /* src1     */ base_instance_ID_temp,
                                   /* src0     */ 0,
                                   /* gr       */ 0));

            if (input_program->flags &
                PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
               /* Add base instance. */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 0,
                     /* src0  */ R32_P(PVR_INDIRECT_BASE_INSTANCE_PTEMP),
                     /* src1  */ R32_T(base_instance_ID_temp),
                     /* dst   */ R32TP_T(base_instance_ID_temp)));

            } else if (input_program->flags &
                       PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_VARIANT) {
               /* Add base instance. */
               PVR_PDS_MODE_TOGGLE(
                  code,
                  instruction,
                  pvr_pds_inst_encode_add32(
                     /* cc    */ 0,
                     /* alum  */ 0,
                     /* sna   */ 0,
                     /* src0  */ R32_C(base_instance),
                     /* src1  */ R32_T(base_instance_ID_temp),
                     /* dst   */ R32TP_T(base_instance_ID_temp)));
            }

            pvr_debug_pds_note(
               "DMA Vertex Index will be sourced from 'uBaseInstanceIdTemp'");
            index = base_instance_ID_temp;
         } else {
            pvr_debug_pds_note(
               "DMA Vertex Index will be sourced from 'uInstanceIdTemp'");
            index = instance_ID_temp;
         }
      } else {
         pvr_debug_pds_note(
            "DMA Vertex Index will be sourced from 'uIndexIdTemp'");
         index = index_id_temp;
      }

      /* DDMAD Const Usage [__XX_---] */
      pvr_write_pds_const_map_entry_vertex_attribute_address(
         &entry_write_state,
         vertex_dma,
         const_base + 4,
         use_robust_vertex_fetch);

      /* DDMAD Const Usage [__XXX---] */
      stride_entry =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*stride_entry));
      stride_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_VERTEX_ATTRIBUTE_STRIDE;
      stride_entry->const_offset = const_base + 3;
      stride_entry->binding_index = vertex_dma->binding_index;

      control_word = vertex_dma->size_in_dwords
                     << PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_BSIZE_SHIFT;
      control_word |= vertex_dma->destination
                      << PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_AO_SHIFT;
      control_word |= (PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_DEST_UNIFIED_STORE |
                       PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_CMODE_CACHED);

      /* DDMADT instructions will do a dummy doutd when OOB if
       * PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_LAST_EN is set but as the driver
       * would need to do another doutd after an OOB DDMADT to provide the 'in
       * bounds' data the DDMADT can't be set as LAST.
       *
       * This requires us to include a final dummy DDMAD.LAST instruction.
       *
       * Pseudocode taken from SeriesXE2017.PDS Instruction Controller
       * Specification.doc
       *
       *	DDMAD src0,src1,src2,src3
       *
       *	calculated_source_address := src0*src1+src2
       *	base_address              := src2
       *	dma_parameters            := src3[31:0]
       *	buffer_size               := src3[63:33]
       *	test                      := src3[32]
       *
       *	if (test == 1) {
       *	   // DDMAD(T)
       *	   if (calculated_source_address[39:0] + (burst_size<<2) <=
       *         base_address[39:0] + buffer_size) {
       *        OOB := 0
       *        DOUTD calculated_source_address,dma_paramters
       *     } else {
       *        OOB := 1
       *        if (last_instance == 1) {
       *           dma_parameters[BURST_SIZE] := 0
       *           DOUTD calculated_source_address,dma_paramters
       *	      }
       *	   }
       *	} else {
       *	   // DDMAD
       *	   DOUTD calculated_source_address,dma_paramters
       *	}
       */

      if (last_dma && (!PVR_HAS_FEATURE(dev_info, pds_ddmadt) ||
                       !use_robust_vertex_fetch)) {
         pvr_debug_pds_note("LAST DDMAD");
         control_word |= PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_LAST_EN;
      }

      /* DDMAD Const Usage [_XXXX---] */
      literal_entry =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*literal_entry));
      literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
      literal_entry->const_offset = (const_base + 6);
      literal_entry->literal_value = control_word;

      if (PVR_HAS_FEATURE(dev_info, pds_ddmadt)) {
         /* DDMAD Const Usage [XXXXX---]
          * With DDMADT an extra 32bits of SRC3 contains the information for
          * performing out-of-bounds tests on the DMA.
          */

         if (use_robust_vertex_fetch) {
            struct pvr_pds_const_map_entry_vertex_attr_ddmadt_oob_buffer_size
               *oob_buffer_size;
            oob_buffer_size =
               pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                    sizeof(*oob_buffer_size));

            oob_buffer_size->type =
               PVR_PDS_CONST_MAP_ENTRY_TYPE_VERTEX_ATTR_DDMADT_OOB_BUFFER_SIZE;
            oob_buffer_size->const_offset = const_base + 7;
            oob_buffer_size->offset = vertex_dma->offset;
            oob_buffer_size->binding_index = vertex_dma->binding_index;
            oob_buffer_size->size_in_dwords = vertex_dma->size_in_dwords;
            oob_buffer_size->attrib_size_in_bytes =
               vertex_dma->attrib_size_in_bytes;
         } else {
            literal_entry =
               pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                    sizeof(*literal_entry));
            literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
            literal_entry->const_offset = const_base + 7;
            literal_entry->literal_value = 0;
         }

         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_pds_inst_encode_ddmad(0, /* cc */
                                      0, /* END */
                                      R32_C(const_base + 3), /* SRC0 (REGS32) */
                                      index, /* SRC1 (REGS32T) */
                                      R64_C((const_base + 4) >> 1), /* SRC2
                                                                     * (REGS64)
                                                                     */
                                      R64_C((const_base + 6) >> 1) /* SRC3
                                                                    * (REGS64C)
                                                                    */
                                      ));

         if (use_robust_vertex_fetch) {
            /* If not out of bounds, skip next DDMAD instructions. */
            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_ddmad(
                                   1, /* cc */
                                   0, /* END */
                                   R32_C(const_base + 3), /* SRC0 (REGS32) */
                                   R32_T(zero_temp), /* SRC1 (REGS32T) */
                                   R64_C((const_base + 4) >> 1), /* SRC2
                                                                  * (REGS64)
                                                                  */
                                   R64_C((const_base + 6) >> 1) /* SRC3
                                                                 * (REGS64C)
                                                                 */
                                   ));

            /* Now the driver must have a dummy DDMAD marked as last. */
            if (last_dma) {
               uint32_t dummy_dma_const = pvr_find_constant(const_usage,
                                                            RESERVE_64BIT,
                                                            "uDummyDMAConst");
               uint32_t zero_const =
                  pvr_find_constant(const_usage, RESERVE_64BIT, "uZeroConst");

               literal_entry =
                  pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                       sizeof(*literal_entry));
               literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
               literal_entry->const_offset = zero_const;
               literal_entry->literal_value = 0;

               literal_entry =
                  pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                       sizeof(*literal_entry));
               literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
               literal_entry->const_offset = zero_const + 1;
               literal_entry->literal_value = 0;

               literal_entry =
                  pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                       sizeof(*literal_entry));
               literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
               literal_entry->const_offset = dummy_dma_const;
               literal_entry->literal_value = 0;

               literal_entry->literal_value |=
                  0 << PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_BSIZE_SHIFT;
               literal_entry->literal_value |=
                  (PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_DEST_UNIFIED_STORE |
                   PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_CMODE_CACHED);
               literal_entry->literal_value |=
                  PVR_ROGUE_PDSINST_DDMAD_FIELDS_SRC3_LAST_EN;

               literal_entry =
                  pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                       sizeof(*literal_entry));
               literal_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_LITERAL32;
               literal_entry->const_offset = dummy_dma_const + 1;
               literal_entry->literal_value = 0;

               PVR_PDS_MODE_TOGGLE(code,
                                   instruction,
                                   pvr_pds_inst_encode_ddmad(
                                      0, /* cc */
                                      0, /* END */
                                      R32_C(zero_const), /* SRC0 (REGS32)
                                                          */
                                      R32_T(zero_temp), /* SRC1 (REGS32T)
                                                         */
                                      R64_C((dummy_dma_const) >> 1), /* SRC2
                                                                        (REGS64)
                                                                     */
                                      R64_C((dummy_dma_const) >> 1) /* SRC3
                                                                       (REGS64C)
                                                                    */
                                      ));
            }
         }
      } else {
         if (use_robust_vertex_fetch) {
            struct pvr_const_map_entry_vertex_attribute_max_index
               *max_index_entry;

            pvr_debug("RobustVertexFetch DDMAD");

            const uint32_t max_index_const =
               pvr_find_constant(const_usage, RESERVE_32BIT, "max_index_const");

            max_index_entry =
               pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                    sizeof(*max_index_entry));
            max_index_entry->const_offset = max_index_const;
            max_index_entry->type =
               PVR_PDS_CONST_MAP_ENTRY_TYPE_VERTEX_ATTRIBUTE_MAX_INDEX;
            max_index_entry->binding_index = vertex_dma->binding_index;
            max_index_entry->offset = vertex_dma->offset;
            max_index_entry->stride = vertex_dma->stride;
            max_index_entry->size_in_dwords = vertex_dma->size_in_dwords;
            max_index_entry->attrib_size_in_bytes =
               vertex_dma->attrib_size_in_bytes;

            PVR_PDS_MODE_TOGGLE(
               code,
               instruction,
               pvr_pds_inst_encode_add32(0, /* cc */
                                         0, /* ALUM */
                                         PVR_ROGUE_PDSINST_LOP_NONE, /* SNA */
                                         R32_C(max_index_const), /* SRC0
                                                                  * (REGS32)
                                                                  */
                                         R32_T(zero_temp), /* SRC1 (REGS32) */
                                         R32TP_T(max_index_temp) /* DST
                                                                  * (REG32TP)
                                                                  */
                                         ));

            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_sftlp32(
                                   1, /* IM */
                                   0, /* cc */
                                   PVR_ROGUE_PDSINST_LOP_NONE, /* LOP */
                                   index, /* SRC0 (REGS32T) */
                                   0, /* SRC1 (REGS32) */
                                   0, /* SRC2 (REG32TP) */
                                   R32TP_T(current_index_temp) /* DST
                                                                * (REG32TP)
                                                                */
                                   ));

            PVR_PDS_MODE_TOGGLE(
               code,
               instruction,
               pvr_pds_inst_encode_cmp(
                  0, /* cc enable */
                  PVR_ROGUE_PDSINST_COP_GT, /* Operation */
                  R64TP_T(current_index_temp >> 1), /* SRC
                                                     * (REGS64TP)
                                                     */
                  R64_T(max_index_temp >> 1) /* SRC1 (REGS64) */
                  ));

            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_sftlp32(
                                   1, /* IM */
                                   1, /* cc */
                                   PVR_ROGUE_PDSINST_LOP_NONE, /* LOP */
                                   zero_temp, /* SRC0 (REGS32T) */
                                   0, /* SRC1 (REGS32) */
                                   0, /* SRC2 (REG32TP) */
                                   R32TP_T(current_index_temp) /* DST
                                                                * (REG32TP)
                                                                */
                                   ));

            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_ddmad(
                                   0, /* cc  */
                                   0, /* END */
                                   R32_C(const_base + 3), /* SRC0 (REGS32) */
                                   current_index_temp, /* SRC1 (REGS32T) */
                                   R64_C((const_base + 4) >> 1), /* SRC2
                                                                  * (REGS64)
                                                                  */
                                   (const_base + 6) >> 1 /* SRC3 (REGS64C) */
                                   ));
         } else {
            PVR_PDS_MODE_TOGGLE(code,
                                instruction,
                                pvr_pds_inst_encode_ddmad(
                                   /* cc    */ 0,
                                   /* end   */ 0,
                                   /* src0  */ R32_C(const_base + 3),
                                   /* src1  */ (index),
                                   /* src2  */ R64_C((const_base + 4) >> 1),
                                   /* src3  */ (const_base + 6) >> 1));
         }
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_VERTEX_ID_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);

      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_encode_direct_write(
            &entry_write_state,
            last_dma,
            false,
            R64_C(write_vertex_control),
            R64_T(0),
            0x1,
            input_program->vertex_id_register,
            PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
            dev_info));
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_INSTANCE_ID_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);

      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_encode_direct_write(
            &entry_write_state,
            last_dma,
            false,
            R64_C(write_instance_control),
            R64_T(0),
            0x2,
            input_program->instance_id_register,
            PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
            dev_info));
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_BASE_INSTANCE_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);

      if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
         /* Base instance comes from ptemp 1. */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(write_base_instance_control),
               R64_P(PVR_INDIRECT_BASE_INSTANCE_PTEMP >> 1),
               0x2,
               input_program->base_instance_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      } else {
         uint32_t data_mask = (base_instance & 1) ? 0x2 : 0x1;

         /* Base instance comes from driver constant. */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(write_base_instance_control),
               R64_C(base_instance >> 1),
               data_mask,
               input_program->base_instance_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_BASE_VERTEX_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);

      if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
         /* Base vertex comes from ptemp 0 (initialized by PDS hardware). */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(write_base_vertex_control),
               R64_P(0),
               0x1,
               input_program->base_vertex_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      } else {
         uint32_t data_mask = (base_vertex & 1) ? 0x2 : 0x1;

         /* Base vertex comes from driver constant (literal 0). */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(write_base_vertex_control),
               R64_C(base_vertex >> 1),
               data_mask,
               input_program->base_vertex_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDEX_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);

      if (input_program->flags & PVR_PDS_VERTEX_FLAGS_DRAW_INDIRECT_VARIANT) {
         /* Draw index comes from ptemp 3. */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(pvr_write_draw_index_control),
               R64_P(1),
               0x2,
               input_program->draw_index_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      } else {
         uint32_t data_mask = (draw_index & 1) ? 0x2 : 0x1;

         /* Draw index comes from constant (literal 0). */
         PVR_PDS_MODE_TOGGLE(
            code,
            instruction,
            pvr_encode_direct_write(
               &entry_write_state,
               last_dma,
               false,
               R64_C(pvr_write_draw_index_control),
               R64_C(draw_index >> 1),
               data_mask,
               input_program->draw_index_register,
               PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
               dev_info));
      }
   }

   if (input_program->flags & PVR_PDS_VERTEX_FLAGS_VIEW_INDEX_REQUIRED) {
      bool last_dma = (++running_dma_count == total_dma_count);
      uint32_t data_mask = (PVR_PTEMP_VIEW_INDEX & 1) ? 0x2 : 0x1;

      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_encode_direct_write(
            &entry_write_state,
            last_dma,
            false,
            R64_C(write_view_index_control),
            R64_P(PVR_PTEMP_VIEW_INDEX >> 1),
            data_mask,
            input_program->view_index_register,
            PVR_ROGUE_PDSINST_DOUT_FIELDS_DOUTW_SRC1_DEST_UNIFIED_STORE,
            dev_info));
   }

   doutu_address_entry =
      pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                           sizeof(*doutu_address_entry));
   doutu_address_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_DOUTU_ADDRESS;
   doutu_address_entry->const_offset = 0;
   doutu_address_entry->doutu_control = input_program->usc_task_control.src0;

   if (use_robust_vertex_fetch) {
      /* Restore IF0 */
      PVR_PDS_MODE_TOGGLE(
         code,
         instruction,
         pvr_pds_inst_encode_bra(PVR_ROGUE_PDSINST_PREDICATE_KEEP, /* SRCCC */
                                 0, /* Neg */
                                 PVR_ROGUE_PDSINST_PREDICATE_IF0, /* SETCC */
                                 1 /* Addr */
                                 ));
   }

   PVR_PDS_MODE_TOGGLE(code, instruction, pvr_pds_encode_doutu(1, 1, 0));
   PVR_PDS_MODE_TOGGLE(code, instruction, pvr_pds_inst_encode_halt(0));

   assert(running_dma_count == total_dma_count);

   for (uint32_t i = 0; i < ARRAY_SIZE(const_usage); i++) {
      if (const_usage[i] == 0)
         break;

      info->data_size_in_dwords =
         8 * i + (32 - __builtin_clz((uint32_t)const_usage[i]));
   }

   info->temps_required = temp_usage.temps_needed;
   info->entry_count = entry_write_state.entry_count;
   info->entries_written_size_in_bytes =
      entry_write_state.entries_size_in_bytes;
   info->code_size_in_dwords = instruction;

   pvr_debug("=================================================\n");
}

void pvr_pds_generate_descriptor_upload_program(
   struct pvr_pds_descriptor_program_input *input_program,
   uint32_t *code_section,
   struct pvr_pds_info *info)
{
   unsigned int num_consts64 = 0;
   unsigned int num_consts32 = 0;
   unsigned int next_const64;
   unsigned int next_const32;
   unsigned int instruction = 0;
   uint32_t compile_time_buffer_index = 0;

   unsigned int total_dma_count = 0;
   unsigned int running_dma_count = 0;

   struct pvr_pds_const_map_entry_write_state entry_write_state;

   /* Calculate the total register usage so we can stick 32-bit consts
    * after 64. Each DOUTD/DDMAD requires 1 32-bit constant and 1 64-bit
    * constant.
    */
   num_consts32 = input_program->descriptor_set_count;
   num_consts64 = input_program->descriptor_set_count;
   total_dma_count = input_program->descriptor_set_count;

   pvr_init_pds_const_map_entry_write_state(info, &entry_write_state);

   /* 1 DOUTD per compile time buffer: */
   for (unsigned int index = 0; index < input_program->buffer_count; index++) {
      num_consts32++;
      num_consts64++;
      total_dma_count++;
   }

   /* DOUTU for the secondary update program requires a 64-bit constant. */
   if (input_program->secondary_program_present)
      num_consts64++;

   info->data_size_in_dwords = (num_consts64 * 2) + (num_consts32);

   /* Start counting constants. */
   next_const64 = 0;
   next_const32 = num_consts64 * 2;

   /* For each descriptor set perform a DOUTD. */
   for (unsigned int descriptor_index = 0;
        descriptor_index < input_program->descriptor_set_count;
        descriptor_index++) {
      struct pvr_const_map_entry_descriptor_set *descriptor_set_entry;
      struct pvr_pds_descriptor_set *descriptor_set =
         &input_program->descriptor_sets[descriptor_index];

      bool last_dma = (++running_dma_count == total_dma_count);
      bool halt = last_dma && !input_program->secondary_program_present;

      descriptor_set_entry =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*descriptor_set_entry));
      descriptor_set_entry->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_DESCRIPTOR_SET;
      descriptor_set_entry->const_offset = next_const64 * 2;
      descriptor_set_entry->descriptor_set = descriptor_set->descriptor_set;

      PVR_PDS_MODE_TOGGLE(code_section,
                          instruction,
                          pvr_encode_burst_cs(&entry_write_state,
                                              last_dma,
                                              halt,
                                              next_const32,
                                              next_const64,
                                              descriptor_set->size_in_dwords,
                                              descriptor_set->destination));

      next_const64++;
      next_const32++;
   }

   for (unsigned int index = 0; index < input_program->buffer_count; index++) {
      struct pvr_pds_buffer *buffer = &input_program->buffers[index];

      bool last_dma = (++running_dma_count == total_dma_count);
      bool halt = last_dma && !input_program->secondary_program_present;

      switch (buffer->type) {
      case PVR_BUFFER_TYPE_DYNAMIC:
      case PVR_BUFFER_TYPE_PUSH_CONSTS:
      case PVR_BUFFER_TYPE_BLEND_CONSTS:
      case PVR_BUFFER_TYPE_POINT_SAMPLER:
      case PVR_BUFFER_TYPE_IA_SAMPLER:
      case PVR_BUFFER_TYPE_FRONT_FACE_OP:
      case PVR_BUFFER_TYPE_FS_META:
      case PVR_BUFFER_TYPE_TILE_BUFFERS:
      case PVR_BUFFER_TYPE_SPILL_INFO:
      case PVR_BUFFER_TYPE_SCRATCH_INFO:
      case PVR_BUFFER_TYPE_SAMPLE_LOCATIONS: {
         struct pvr_const_map_entry_special_buffer *special_buffer_entry;

         special_buffer_entry =
            pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                 sizeof(*special_buffer_entry));
         special_buffer_entry->type =
            PVR_PDS_CONST_MAP_ENTRY_TYPE_SPECIAL_BUFFER;
         special_buffer_entry->buffer_type = buffer->type;
         special_buffer_entry->size_in_dwords = buffer->size_in_dwords;

         switch (buffer->type) {
         case PVR_BUFFER_TYPE_DYNAMIC:
            special_buffer_entry->data = buffer->desc_set;
            break;

         default:
            break;
         }
         break;
      }
      case PVR_BUFFER_TYPE_COMPILE_TIME: {
         struct pvr_const_map_entry_special_buffer *special_buffer_entry;

         special_buffer_entry =
            pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                                 sizeof(*special_buffer_entry));
         special_buffer_entry->type =
            PVR_PDS_CONST_MAP_ENTRY_TYPE_SPECIAL_BUFFER;
         special_buffer_entry->buffer_type = PVR_BUFFER_TYPE_COMPILE_TIME;
         special_buffer_entry->buffer_index = compile_time_buffer_index++;
         break;
      }
      }

      entry_write_state.entry->const_offset = next_const64 * 2;

      PVR_PDS_MODE_TOGGLE(code_section,
                          instruction,
                          pvr_encode_burst_cs(&entry_write_state,
                                              last_dma,
                                              halt,
                                              next_const32,
                                              next_const64,
                                              buffer->size_in_dwords,
                                              buffer->destination));

      next_const64++;
      next_const32++;
   }

   if (total_dma_count != running_dma_count)
      fprintf(stderr, "Mismatch in DMA count\n");

   if (input_program->secondary_program_present) {
      struct pvr_const_map_entry_doutu_address *doutu_address;

      PVR_PDS_MODE_TOGGLE(code_section,
                          instruction,
                          pvr_pds_encode_doutu(false, true, next_const64));

      doutu_address =
         pvr_prepare_next_pds_const_map_entry(&entry_write_state,
                                              sizeof(*doutu_address));
      doutu_address->type = PVR_PDS_CONST_MAP_ENTRY_TYPE_DOUTU_ADDRESS;
      doutu_address->const_offset = next_const64 * 2;
      doutu_address->doutu_control = input_program->secondary_task_control.src0;

      next_const64++;
   }

   if (instruction == 0 && input_program->must_not_be_empty) {
      PVR_PDS_MODE_TOGGLE(code_section,
                          instruction,
                          pvr_pds_inst_encode_halt(
                             /* cc */ false));
   }

   info->entry_count = entry_write_state.entry_count;
   info->entries_written_size_in_bytes =
      entry_write_state.entries_size_in_bytes;
   info->code_size_in_dwords = instruction;
}
