gpu_context.cc

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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.
 *
 * The Original Code is Copyright (C) 2016 by Mike Erwin.
 * All rights reserved.
 */
 
/* TODO Create cmake option. */
#define WITH_OPENGL_BACKEND 1
 
#include "BLI_assert.h"
#include "BLI_utildefines.h"
 
#include "GPU_context.h"
#include "GPU_framebuffer.h"
 
#include "GHOST_C-api.h"
 
#include "gpu_backend.hh"
#include "gpu_batch_private.hh"
#include "gpu_context_private.hh"
#include "gpu_matrix_private.h"
 
#ifdef WITH_OPENGL_BACKEND
#  include "gl_backend.hh"
#  include "gl_context.hh"
#endif
 
#include <mutex>
#include <vector>
 
using namespace blender::gpu;
 
static thread_local Context *active_ctx = nullptr;
 
/* -------------------------------------------------------------------- */
namespace blender::gpu {
 
Context::Context()
{
  thread_ = pthread_self();
  is_active_ = false;
  matrix_state = GPU_matrix_state_create();
}
 
Context::~Context()
{
  GPU_matrix_state_discard(matrix_state);
  delete state_manager;
  delete front_left;
  delete back_left;
  delete front_right;
  delete back_right;
  delete imm;
}
 
bool Context::is_active_on_thread()
{
  return (this == active_ctx) && pthread_equal(pthread_self(), thread_);
}
 
Context *Context::get()
{
  return active_ctx;
}
 
}  // namespace blender::gpu
 
/* -------------------------------------------------------------------- */
 
GPUContext *GPU_context_create(void *ghost_window)
{
  if (GPUBackend::get() == nullptr) {
    /* TODO move where it make sense. */
    GPU_backend_init(GPU_BACKEND_OPENGL);
  }
 
  Context *ctx = GPUBackend::get()->context_alloc(ghost_window);
 
  GPU_context_active_set(wrap(ctx));
  return wrap(ctx);
}
 
/* to be called after GPU_context_active_set(ctx_to_destroy) */
void GPU_context_discard(GPUContext *ctx_)
{
  Context *ctx = unwrap(ctx_);
  delete ctx;
  active_ctx = nullptr;
}
 
/* ctx can be NULL */
void GPU_context_active_set(GPUContext *ctx_)
{
  Context *ctx = unwrap(ctx_);
 
  if (active_ctx) {
    active_ctx->deactivate();
  }
 
  active_ctx = ctx;
 
  if (ctx) {
    ctx->activate();
  }
}
 
GPUContext *GPU_context_active_get(void)
{
  return wrap(Context::get());
}
 
/* -------------------------------------------------------------------- */
static std::mutex main_context_mutex;
 
void GPU_context_main_lock(void)
{
  main_context_mutex.lock();
}
 
void GPU_context_main_unlock(void)
{
  main_context_mutex.unlock();
}
 
/* -------------------------------------------------------------------- */
static GPUBackend *g_backend;
 
void GPU_backend_init(eGPUBackendType backend_type)
{
  BLI_assert(g_backend == nullptr);
 
  switch (backend_type) {
#if WITH_OPENGL_BACKEND
    case GPU_BACKEND_OPENGL:
      g_backend = new GLBackend;
      break;
#endif
    default:
      BLI_assert(0);
      break;
  }
}
 
void GPU_backend_exit(void)
{
  /* TODO assert no resource left. Currently UI textures are still not freed in their context
   * correctly. */
  delete g_backend;
  g_backend = nullptr;
}
 
GPUBackend *GPUBackend::get()
{
  return g_backend;
}