test2/source/blender/draw/intern/draw_shader.cc

/* SPDX-FileCopyrightText: 2020 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup draw_engine
 */

#include "draw_shader.hh"

#include "GPU_batch.hh"
#include "GPU_capabilities.hh"

#include "opensubdiv_capi_type.hh"
#include "opensubdiv_evaluator_capi.hh"

#include "DRW_render.hh"

#define SHADER_CUSTOM_DATA_INTERP_MAX_DIMENSIONS 4

static blender::StringRefNull get_subdiv_shader_info_name(SubdivShaderType shader_type)
{
  switch (shader_type) {
    case SubdivShaderType::BUFFER_LINES:
      return "subdiv_lines";

    case SubdivShaderType::BUFFER_LINES_LOOSE:
      return "subdiv_lines_loose";

    case SubdivShaderType::BUFFER_TRIS:
      return "subdiv_tris_single_material";

    case SubdivShaderType::BUFFER_TRIS_MULTIPLE_MATERIALS:
      return "subdiv_tris_multiple_materials";

    case SubdivShaderType::BUFFER_EDGE_FAC:
      return "subdiv_edge_fac";

    case SubdivShaderType::BUFFER_SCULPT_DATA:
      return "subdiv_sculpt_data";

    case SubdivShaderType::PATCH_EVALUATION:
      return "subdiv_patch_evaluation_verts";

    case SubdivShaderType::PATCH_EVALUATION_FVAR:
      return "subdiv_patch_evaluation_fvar";

    case SubdivShaderType::PATCH_EVALUATION_FACE_DOTS:
      return "subdiv_patch_evaluation_fdots";

    case SubdivShaderType::PATCH_EVALUATION_FACE_DOTS_WITH_NORMALS:
      return "subdiv_patch_evaluation_fdots_normals";

    case SubdivShaderType::PATCH_EVALUATION_ORCO:
      return "subdiv_patch_evaluation_verts_orcos";

    case SubdivShaderType::BUFFER_UV_STRETCH_ANGLE:
      return "subdiv_edituv_stretch_angle";

    case SubdivShaderType::BUFFER_UV_STRETCH_AREA:
      return "subdiv_edituv_stretch_area";

    case SubdivShaderType::BUFFER_NORMALS_ACCUMULATE:
      return "subdiv_normals_accumulate";

    case SubdivShaderType::BUFFER_NORMALS_FINALIZE:
      return "subdiv_normals_finalize";

    case SubdivShaderType::BUFFER_CUSTOM_NORMALS_FINALIZE:
      return "subdiv_custom_normals_finalize";

    case SubdivShaderType::BUFFER_LNOR:
      return "subdiv_loop_normals";

    case SubdivShaderType::COMP_CUSTOM_DATA_INTERP:
      break;

    default:
      break;
  }
  BLI_assert_unreachable();
  return "";
}

namespace blender::draw::Shader {

class ShaderCache {
  static gpu::StaticShaderCache<ShaderCache> &get_static_cache()
  {
    static gpu::StaticShaderCache<ShaderCache> static_cache;
    return static_cache;
  }

 public:
  static ShaderCache &get()
  {
    return get_static_cache().get();
  }
  static void release()
  {
    get_static_cache().release();
  }

  gpu::StaticShader hair_refine = {"draw_hair_refine_compute"};
  gpu::StaticShader debug_draw_display = {"draw_debug_draw_display"};
  gpu::StaticShader draw_visibility_compute = {"draw_visibility_compute"};
  gpu::StaticShader draw_view_finalize = {"draw_view_finalize"};
  gpu::StaticShader draw_resource_finalize = {"draw_resource_finalize"};
  gpu::StaticShader draw_command_generate = {"draw_command_generate"};

  gpu::StaticShader subdiv_sh[SUBDIVISION_MAX_SHADERS];
  gpu::StaticShader subdiv_custom_data_sh[SHADER_CUSTOM_DATA_INTERP_MAX_DIMENSIONS][GPU_COMP_MAX];

  ShaderCache()
  {
    for (int i : IndexRange(SUBDIVISION_MAX_SHADERS)) {
      if (SubdivShaderType(i) == SubdivShaderType::COMP_CUSTOM_DATA_INTERP) {
        continue;
      }
      subdiv_sh[i] = {get_subdiv_shader_info_name(SubdivShaderType(i)).c_str()};
    }

    for (int dimension : IndexRange(SHADER_CUSTOM_DATA_INTERP_MAX_DIMENSIONS)) {
      for (GPUVertCompType comp_type : {GPU_COMP_U16, GPU_COMP_I32, GPU_COMP_F32}) {
        std::string info_name = "subdiv_custom_data_interp";
        const char *dimension_names[] = {"_1d", "_2d", "_3d", "_4d"};
        info_name += dimension_names[dimension];

        switch (comp_type) {
          case GPU_COMP_U16:
            info_name += "_u16";
            break;
          case GPU_COMP_I32:
            info_name += "_i32";
            break;
          case GPU_COMP_F32:
            info_name += "_f32";
            break;
          default:
            BLI_assert_unreachable();
        }

        subdiv_custom_data_sh[dimension][comp_type] = {info_name};
      }
    }
  }
};

}  // namespace blender::draw::Shader

using namespace blender::draw::Shader;

GPUShader *DRW_shader_hair_refine_get(ParticleRefineShader /*refinement*/)
{
  return ShaderCache::get().hair_refine.get();
}

GPUShader *DRW_shader_curves_refine_get(blender::draw::CurvesEvalShader /*type*/)
{
  /* TODO: Implement curves evaluation types (Bezier and Catmull Rom). */
  return ShaderCache::get().hair_refine.get();
}

GPUShader *DRW_shader_debug_draw_display_get()
{
  return ShaderCache::get().debug_draw_display.get();
}

GPUShader *DRW_shader_draw_visibility_compute_get()
{
  return ShaderCache::get().draw_visibility_compute.get();
}

GPUShader *DRW_shader_draw_view_finalize_get()
{
  return ShaderCache::get().draw_view_finalize.get();
}

GPUShader *DRW_shader_draw_resource_finalize_get()
{
  return ShaderCache::get().draw_resource_finalize.get();
}

GPUShader *DRW_shader_draw_command_generate_get()
{
  return ShaderCache::get().draw_command_generate.get();
}

GPUShader *DRW_shader_subdiv_get(SubdivShaderType shader_type)
{
  BLI_assert(!ELEM(shader_type, SubdivShaderType::COMP_CUSTOM_DATA_INTERP));
  return ShaderCache::get().subdiv_sh[uint(shader_type)].get();
}

GPUShader *DRW_shader_subdiv_custom_data_get(GPUVertCompType comp_type, int dimensions)
{
  BLI_assert(dimensions >= 1 && dimensions <= SHADER_CUSTOM_DATA_INTERP_MAX_DIMENSIONS);
  if (comp_type == GPU_COMP_U16) {
    BLI_assert(dimensions == 4);
  }
  BLI_assert(ELEM(comp_type, GPU_COMP_U16, GPU_COMP_I32, GPU_COMP_F32));

  return ShaderCache::get().subdiv_custom_data_sh[dimensions - 1][comp_type].get();
}

void DRW_shaders_free()
{
  GPU_shader_unbind();
  ShaderCache::release();
}