/*
 * Copyright © 2021 Google
 *
 * SPDX-License-Identifier: MIT
 */

#define AC_SURFACE_INCLUDE_NIR
#include "ac_surface.h"

#include "radv_meta.h"
#include "vk_common_entrypoints.h"

static nir_shader *
build_dcc_retile_compute_shader(struct radv_device *dev, struct radeon_surf *surf)
{
   const struct radv_physical_device *pdev = radv_device_physical(dev);
   enum glsl_sampler_dim dim = GLSL_SAMPLER_DIM_BUF;
   const struct glsl_type *buf_type = glsl_image_type(dim, false, GLSL_TYPE_UINT);
   nir_builder b = radv_meta_init_shader(dev, MESA_SHADER_COMPUTE, "dcc_retile_compute");

   b.shader->info.workgroup_size[0] = 8;
   b.shader->info.workgroup_size[1] = 8;

   nir_def *src_dcc_size = nir_load_push_constant(&b, 2, 32, nir_imm_int(&b, 0), .range = 8);
   nir_def *src_dcc_pitch = nir_channels(&b, src_dcc_size, 1);
   nir_def *src_dcc_height = nir_channels(&b, src_dcc_size, 2);

   nir_def *dst_dcc_size = nir_load_push_constant(&b, 2, 32, nir_imm_int(&b, 8), .range = 8);
   nir_def *dst_dcc_pitch = nir_channels(&b, dst_dcc_size, 1);
   nir_def *dst_dcc_height = nir_channels(&b, dst_dcc_size, 2);
   nir_variable *input_dcc = nir_variable_create(b.shader, nir_var_uniform, buf_type, "dcc_in");
   input_dcc->data.descriptor_set = 0;
   input_dcc->data.binding = 0;
   nir_variable *output_dcc = nir_variable_create(b.shader, nir_var_uniform, buf_type, "dcc_out");
   output_dcc->data.descriptor_set = 0;
   output_dcc->data.binding = 1;

   nir_def *input_dcc_ref = &nir_build_deref_var(&b, input_dcc)->def;
   nir_def *output_dcc_ref = &nir_build_deref_var(&b, output_dcc)->def;

   nir_def *coord = get_global_ids(&b, 2);
   nir_def *zero = nir_imm_int(&b, 0);
   coord =
      nir_imul(&b, coord, nir_imm_ivec2(&b, surf->u.gfx9.color.dcc_block_width, surf->u.gfx9.color.dcc_block_height));

   nir_def *src = ac_nir_dcc_addr_from_coord(&b, &pdev->info, surf->bpe, &surf->u.gfx9.color.dcc_equation,
                                             src_dcc_pitch, src_dcc_height, zero, nir_channel(&b, coord, 0),
                                             nir_channel(&b, coord, 1), zero, zero, zero);
   nir_def *dst = ac_nir_dcc_addr_from_coord(&b, &pdev->info, surf->bpe, &surf->u.gfx9.color.display_dcc_equation,
                                             dst_dcc_pitch, dst_dcc_height, zero, nir_channel(&b, coord, 0),
                                             nir_channel(&b, coord, 1), zero, zero, zero);

   nir_def *dcc_val = nir_image_deref_load(&b, 1, 32, input_dcc_ref, nir_vec4(&b, src, src, src, src),
                                           nir_undef(&b, 1, 32), nir_imm_int(&b, 0), .image_dim = dim);

   nir_image_deref_store(&b, output_dcc_ref, nir_vec4(&b, dst, dst, dst, dst), nir_undef(&b, 1, 32), dcc_val,
                         nir_imm_int(&b, 0), .image_dim = dim);

   return b.shader;
}

static VkResult
get_pipeline_layout(struct radv_device *device, VkPipelineLayout *layout_out)
{
   const char *key_data = "radv-dcc-retile";

   const VkDescriptorSetLayoutBinding bindings[] = {
      {
         .binding = 0,
         .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,
         .descriptorCount = 1,
         .stageFlags = VK_SHADER_STAGE_COMPUTE_BIT,
      },
      {
         .binding = 1,
         .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,
         .descriptorCount = 1,
         .stageFlags = VK_SHADER_STAGE_COMPUTE_BIT,
      },

   };

   const VkDescriptorSetLayoutCreateInfo desc_info = {
      .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
      .flags = VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT,
      .bindingCount = 2,
      .pBindings = bindings,
   };

   const VkPushConstantRange pc_range = {
      .stageFlags = VK_SHADER_STAGE_COMPUTE_BIT,
      .size = 16,
   };

   return vk_meta_get_pipeline_layout(&device->vk, &device->meta_state.device, &desc_info, &pc_range, key_data,
                                      strlen(key_data), layout_out);
}

/*
 * This take a surface, but the only things used are:
 * - BPE
 * - DCC equations
 * - DCC block size
 *
 * BPE is always 4 at the moment and the rest is derived from the tilemode.
 */
static VkResult
get_pipeline(struct radv_device *device, struct radv_image *image, VkPipeline *pipeline_out,
             VkPipelineLayout *layout_out)
{
   const unsigned swizzle_mode = image->planes[0].surface.u.gfx9.swizzle_mode;
   char key_data[64];
   VkResult result;

   result = get_pipeline_layout(device, layout_out);
   if (result != VK_SUCCESS)
      return result;

   snprintf(key_data, sizeof(key_data), "radv-dcc-retile-%d", swizzle_mode);

   VkPipeline pipeline_from_cache = vk_meta_lookup_pipeline(&device->meta_state.device, key_data, strlen(key_data));
   if (pipeline_from_cache != VK_NULL_HANDLE) {
      *pipeline_out = pipeline_from_cache;
      return VK_SUCCESS;
   }

   nir_shader *cs = build_dcc_retile_compute_shader(device, &image->planes[0].surface);

   const VkPipelineShaderStageCreateInfo stage_info = {
      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
      .stage = VK_SHADER_STAGE_COMPUTE_BIT,
      .module = vk_shader_module_handle_from_nir(cs),
      .pName = "main",
      .pSpecializationInfo = NULL,
   };

   const VkComputePipelineCreateInfo pipeline_info = {
      .sType = VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO,
      .stage = stage_info,
      .flags = 0,
      .layout = *layout_out,
   };

   result = vk_meta_create_compute_pipeline(&device->vk, &device->meta_state.device, &pipeline_info, key_data,
                                            strlen(key_data), pipeline_out);

   ralloc_free(cs);
   return result;
}

void
radv_retile_dcc(struct radv_cmd_buffer *cmd_buffer, struct radv_image *image)
{
   struct radv_meta_saved_state saved_state;
   struct radv_device *device = radv_cmd_buffer_device(cmd_buffer);
   struct radv_buffer buffer;
   VkPipelineLayout layout;
   VkPipeline pipeline;
   VkResult result;

   assert(image->vk.image_type == VK_IMAGE_TYPE_2D);
   assert(image->vk.array_layers == 1 && image->vk.mip_levels == 1);

   struct radv_cmd_state *state = &cmd_buffer->state;

   result = get_pipeline(device, image, &pipeline, &layout);
   if (result != VK_SUCCESS) {
      vk_command_buffer_set_error(&cmd_buffer->vk, result);
      return;
   }

   state->flush_bits |= radv_dst_access_flush(cmd_buffer, VK_PIPELINE_STAGE_2_ALL_COMMANDS_BIT,
                                              VK_ACCESS_2_SHADER_READ_BIT, 0, image, NULL);

   radv_meta_save(&saved_state, cmd_buffer,
                  RADV_META_SAVE_DESCRIPTORS | RADV_META_SAVE_COMPUTE_PIPELINE | RADV_META_SAVE_CONSTANTS);

   radv_CmdBindPipeline(radv_cmd_buffer_to_handle(cmd_buffer), VK_PIPELINE_BIND_POINT_COMPUTE, pipeline);

   radv_buffer_init(&buffer, device, image->bindings[0].bo, image->size, image->bindings[0].offset);

   struct radv_buffer_view views[2];
   VkBufferView view_handles[2];
   radv_buffer_view_init(views, device,
                         &(VkBufferViewCreateInfo){
                            .sType = VK_STRUCTURE_TYPE_BUFFER_VIEW_CREATE_INFO,
                            .buffer = radv_buffer_to_handle(&buffer),
                            .offset = image->planes[0].surface.meta_offset,
                            .range = image->planes[0].surface.meta_size,
                            .format = VK_FORMAT_R8_UINT,
                         });
   radv_buffer_view_init(views + 1, device,
                         &(VkBufferViewCreateInfo){
                            .sType = VK_STRUCTURE_TYPE_BUFFER_VIEW_CREATE_INFO,
                            .buffer = radv_buffer_to_handle(&buffer),
                            .offset = image->planes[0].surface.display_dcc_offset,
                            .range = image->planes[0].surface.u.gfx9.color.display_dcc_size,
                            .format = VK_FORMAT_R8_UINT,
                         });
   for (unsigned i = 0; i < 2; ++i)
      view_handles[i] = radv_buffer_view_to_handle(&views[i]);

   radv_meta_push_descriptor_set(cmd_buffer, VK_PIPELINE_BIND_POINT_COMPUTE, layout, 0, 2,
                                 (VkWriteDescriptorSet[]){
                                    {
                                       .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
                                       .dstBinding = 0,
                                       .dstArrayElement = 0,
                                       .descriptorCount = 1,
                                       .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,
                                       .pTexelBufferView = &view_handles[0],
                                    },
                                    {
                                       .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
                                       .dstBinding = 1,
                                       .dstArrayElement = 0,
                                       .descriptorCount = 1,
                                       .descriptorType = VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER,
                                       .pTexelBufferView = &view_handles[1],
                                    },
                                 });

   unsigned width = DIV_ROUND_UP(image->vk.extent.width, vk_format_get_blockwidth(image->vk.format));
   unsigned height = DIV_ROUND_UP(image->vk.extent.height, vk_format_get_blockheight(image->vk.format));

   unsigned dcc_width = DIV_ROUND_UP(width, image->planes[0].surface.u.gfx9.color.dcc_block_width);
   unsigned dcc_height = DIV_ROUND_UP(height, image->planes[0].surface.u.gfx9.color.dcc_block_height);

   uint32_t constants[] = {
      image->planes[0].surface.u.gfx9.color.dcc_pitch_max + 1,
      image->planes[0].surface.u.gfx9.color.dcc_height,
      image->planes[0].surface.u.gfx9.color.display_dcc_pitch_max + 1,
      image->planes[0].surface.u.gfx9.color.display_dcc_height,
   };
   vk_common_CmdPushConstants(radv_cmd_buffer_to_handle(cmd_buffer), layout, VK_SHADER_STAGE_COMPUTE_BIT, 0, 16,
                              constants);

   radv_unaligned_dispatch(cmd_buffer, dcc_width, dcc_height, 1);

   radv_buffer_view_finish(views);
   radv_buffer_view_finish(views + 1);
   radv_buffer_finish(&buffer);

   radv_meta_restore(&saved_state, cmd_buffer);

   state->flush_bits |=
      RADV_CMD_FLAG_CS_PARTIAL_FLUSH | radv_src_access_flush(cmd_buffer, VK_PIPELINE_STAGE_2_COMPUTE_SHADER_BIT,
                                                             VK_ACCESS_2_SHADER_WRITE_BIT, 0, image, NULL);
}
