gl_context.hh

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Copyright 2020, Blender Foundation.
 * All rights reserved.
 */
 
#pragma once
 
#include "gpu_context_private.hh"
 
#include "GPU_framebuffer.h"
 
#include "BLI_set.hh"
#include "BLI_vector.hh"
 
#include "gl_state.hh"
 
#include "glew-mx.h"
 
#include <mutex>
 
namespace blender {
namespace gpu {
 
class GLVaoCache;
 
class GLSharedOrphanLists {
 public:
  std::mutex lists_mutex;
  Vector<GLuint> textures;
  Vector<GLuint> buffers;
 
 public:
  void orphans_clear(void);
};
 
class GLContext : public Context {
 public:
  static GLint max_cubemap_size;
  static GLint max_texture_3d_size;
  static GLint max_ubo_size;
  static GLint max_ubo_binds;
  static bool base_instance_support;
  static bool clear_texture_support;
  static bool copy_image_support;
  static bool debug_layer_support;
  static bool direct_state_access_support;
  static bool fixed_restart_index_support;
  static bool multi_bind_support;
  static bool multi_draw_indirect_support;
  static bool shader_draw_parameters_support;
  static bool texture_cube_map_array_support;
  static bool texture_filter_anisotropic_support;
  static bool texture_gather_support;
  static bool vertex_attrib_binding_support;
  static bool debug_layer_workaround;
  static bool unused_fb_slot_workaround;
  static bool generate_mipmap_workaround;
  static float derivative_signs[2];
 
  GLuint default_attr_vbo_;
 
  uint16_t bound_ubo_slots;
 
 private:
  Set<GLVaoCache *> vao_caches_;
  Set<GPUFrameBuffer *> framebuffers_;
  std::mutex lists_mutex_;
  Vector<GLuint> orphaned_vertarrays_;
  Vector<GLuint> orphaned_framebuffers_;
  GLSharedOrphanLists &shared_orphan_list_;
 
 public:
  GLContext(void *ghost_window, GLSharedOrphanLists &shared_orphan_list);
  ~GLContext();
 
  static void check_error(const char *info);
 
  void activate(void) override;
  void deactivate(void) override;
 
  void flush(void) override;
  void finish(void) override;
 
  void memory_statistics_get(int *total_mem, int *free_mem) override;
 
  static GLContext *get()
  {
    return static_cast<GLContext *>(Context::get());
  }
 
  static GLStateManager *state_manager_active_get()
  {
    GLContext *ctx = GLContext::get();
    return static_cast<GLStateManager *>(ctx->state_manager);
  };
 
  /* These need to be called with the context the id was created with. */
  void vao_free(GLuint vao_id);
  void fbo_free(GLuint fbo_id);
  /* These can be called by any threads even without OpenGL ctx. Deletion will be delayed. */
  static void buf_free(GLuint buf_id);
  static void tex_free(GLuint tex_id);
 
  void vao_cache_register(GLVaoCache *cache);
  void vao_cache_unregister(GLVaoCache *cache);
 
  void debug_group_begin(const char *name, int index) override;
  void debug_group_end(void) override;
 
 private:
  static void orphans_add(Vector<GLuint> &orphan_list, std::mutex &list_mutex, GLuint id);
  void orphans_clear(void);
 
  MEM_CXX_CLASS_ALLOC_FUNCS("GLContext")
};
 
}  // namespace gpu
}  // namespace blender