gpu_codegen.hh

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/* SPDX-FileCopyrightText: 2005 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
#include "BLI_hash_mm2a.hh"
#include "BLI_listbase.h"
#include "BLI_vector.hh"
 
#include "GPU_material.hh"
#include "GPU_vertex_format.hh"
#include "gpu_node_graph.hh"
#include "gpu_shader_create_info.hh"
 
#include <sstream>
#include <string>
 
namespace blender::gpu::shader {
 
struct GPUCodegenCreateInfo : ShaderCreateInfo {
  struct NameBuffer {
    using NameEntry = std::array<char, 32>;

    char attr_names[16][GPU_MAX_SAFE_ATTR_NAME + 1];
    char var_names[16][8];
    Vector<std::unique_ptr<NameEntry>, 16> sampler_names;
 
    /* Returns the appended name memory location */
    const char *append_sampler_name(const char name[32]);
  };

  StageInterfaceInfo *interface_generated = nullptr;
  NameBuffer name_buffer;
  std::string info_name_;
 
  GPUCodegenCreateInfo(const char *name) : ShaderCreateInfo(name), info_name_(name)
  {
    /* Base class is always initialized first, so we need to update the name_ pointer here. */
    name_ = info_name_.c_str();
  };
  ~GPUCodegenCreateInfo()
  {
    MEM_delete(interface_generated);
  }
};
 
class GPUCodegen {
 public:
  GPUMaterial &mat;
  GPUNodeGraph &graph;
  GPUCodegenOutput output = {};
  GPUCodegenCreateInfo *create_info = nullptr;
 
 private:
  uint32_t hash_ = 0;
  BLI_HashMurmur2A hm2a_;
  ListBase ubo_inputs_ = {nullptr, nullptr};
  GPUInput *cryptomatte_input_ = nullptr;

  uint nodes_total_ = 0;
  uint textures_total_ = 0;
  uint uniforms_total_ = 0;
 
 public:
  GPUCodegen(GPUMaterial *mat_, GPUNodeGraph *graph_, const char *debug_name);
  ~GPUCodegen();
 
  void generate_graphs();
  void generate_cryptomatte();
  void generate_uniform_buffer();
  void generate_attribs();
  void generate_resources();
  void generate_library();
 
  uint32_t hash_get() const
  {
    return hash_;
  }
 
  /* Heuristic determined during pass codegen for whether a
   * more optimal variant of this material should be compiled. */
  bool should_optimize_heuristic() const;
 
 private:
  void set_unique_ids();
 
  void node_serialize(std::stringstream &eval_ss, const GPUNode *node);
  std::string graph_serialize(eGPUNodeTag tree_tag,
                              GPUNodeLink *output_link,
                              const char *output_default = nullptr);
  std::string graph_serialize(eGPUNodeTag tree_tag);
};
 
}  // namespace blender::gpu::shader