gl_state.hh

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

 
#pragma once
 
#include "MEM_guardedalloc.h"
 
#include "BLI_utildefines.h"
 
#include "gpu_state_private.hh"
 
#include <epoxy/gl.h>
 
namespace blender {
namespace gpu {
 
class GLFrameBuffer;
class GLTexture;

class GLStateManager : public StateManager {
 public:
  GLFrameBuffer *active_fb = nullptr;
 
 private:
  GPUState current_;
  GPUStateMutable current_mutable_;
  float line_width_range_[2];
  uint texture_unpack_row_length_ = 0;

  GLuint targets_[64] = {GL_TEXTURE_2D};
  GLuint textures_[64] = {0};
  GLuint samplers_[64] = {0};
  uint64_t dirty_texture_binds_ = 0;
 
  GLuint images_[8] = {0};
  GLenum formats_[8] = {0};
  uint8_t dirty_image_binds_ = 0;
 
 public:
  GLStateManager();
 
  void apply_state() override;
  void force_state() override;
 
  void issue_barrier(GPUBarrier barrier_bits) override;
 
  void texture_bind(Texture *tex, GPUSamplerState sampler, int unit) override;
  void texture_bind_temp(GLTexture *tex);
  void texture_unbind(Texture *tex) override;
  void texture_unbind_all() override;
 
  void image_bind(Texture *tex, int unit) override;
  void image_unbind(Texture *tex) override;
  void image_unbind_all() override;
 
  uint64_t bound_texture_slots();
  uint8_t bound_image_slots();

  void texture_unpack_row_length_set(uint len) override;
  uint texture_unpack_row_length_get() const;
 
 private:
  static void set_write_mask(GPUWriteMask value);
  static void set_depth_test(GPUDepthTest value);
  static void set_stencil_test(GPUStencilTest test, GPUStencilOp operation);
  static void set_stencil_mask(GPUStencilTest test, const GPUStateMutable &state);
  static void set_clip_distances(int new_dist_len, int old_dist_len);
  static void set_logic_op(bool enable);
  static void set_facing(bool invert);
  static void set_backface_culling(GPUFaceCullTest test);
  static void set_provoking_vert(GPUProvokingVertex vert);
  static void set_shadow_bias(bool enable);
  static void set_clip_control(bool enable);
  static void set_blend(GPUBlend value);
 
  void set_state(const GPUState &state);
  void set_mutable_state(const GPUStateMutable &state);
 
  void texture_bind_apply();
  void image_bind_apply();
 
  MEM_CXX_CLASS_ALLOC_FUNCS("GLStateManager")
};
 
/* Fence synchronization primitive. */
class GLFence : public Fence {
 private:
  GLsync gl_sync_ = 0;
 
 public:
  GLFence() : Fence() {};
  ~GLFence();
 
  void signal() override;
  void wait() override;
 
  MEM_CXX_CLASS_ALLOC_FUNCS("GLFence")
};
 
static inline GLbitfield to_gl(GPUBarrier barrier_bits)
{
  GLbitfield barrier = 0;
  if (barrier_bits & GPU_BARRIER_SHADER_IMAGE_ACCESS) {
    barrier |= GL_SHADER_IMAGE_ACCESS_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_SHADER_STORAGE) {
    barrier |= GL_SHADER_STORAGE_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_TEXTURE_FETCH) {
    barrier |= GL_TEXTURE_FETCH_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_TEXTURE_UPDATE) {
    barrier |= GL_TEXTURE_UPDATE_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_COMMAND) {
    barrier |= GL_COMMAND_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_FRAMEBUFFER) {
    barrier |= GL_FRAMEBUFFER_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_VERTEX_ATTRIB_ARRAY) {
    barrier |= GL_VERTEX_ATTRIB_ARRAY_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_ELEMENT_ARRAY) {
    barrier |= GL_ELEMENT_ARRAY_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_UNIFORM) {
    barrier |= GL_UNIFORM_BARRIER_BIT;
  }
  if (barrier_bits & GPU_BARRIER_BUFFER_UPDATE) {
    barrier |= GL_BUFFER_UPDATE_BARRIER_BIT;
  }
  return barrier;
}
 
}  // namespace gpu
}  // namespace blender