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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2014 Blender Foundation. All rights reserved. */
/** \file
* \ingroup GHOST
*
* Definition of GHOST_ContextSDL class.
*/
#include "GHOST_ContextSDL.h"
#include <vector>
#include <cassert>
#include <cstdio>
#include <cstring>
SDL_GLContext GHOST_ContextSDL::s_sharedContext = nullptr;
int GHOST_ContextSDL::s_sharedCount = 0;
GHOST_ContextSDL::GHOST_ContextSDL(bool stereoVisual,
SDL_Window *window,
int contextProfileMask,
int contextMajorVersion,
int contextMinorVersion,
int contextFlags,
int contextResetNotificationStrategy)
: GHOST_Context(stereoVisual),
m_window(window),
m_hidden_window(nullptr),
m_contextProfileMask(contextProfileMask),
m_contextMajorVersion(contextMajorVersion),
m_contextMinorVersion(contextMinorVersion),
m_contextFlags(contextFlags),
m_contextResetNotificationStrategy(contextResetNotificationStrategy),
m_context(nullptr)
{
// assert(m_window != nullptr);
}
GHOST_ContextSDL::~GHOST_ContextSDL()
{
if (m_context == nullptr) {
return;
}
if (m_window != nullptr && m_context == SDL_GL_GetCurrentContext()) {
SDL_GL_MakeCurrent(m_window, nullptr);
}
if (m_context != s_sharedContext || s_sharedCount == 1) {
assert(s_sharedCount > 0);
s_sharedCount--;
if (s_sharedCount == 0) {
s_sharedContext = nullptr;
}
SDL_GL_DeleteContext(m_context);
}
if (m_hidden_window != nullptr) {
SDL_DestroyWindow(m_hidden_window);
}
}
GHOST_TSuccess GHOST_ContextSDL::swapBuffers()
{
SDL_GL_SwapWindow(m_window);
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_ContextSDL::activateDrawingContext()
{
if (m_context == nullptr) {
return GHOST_kFailure;
}
return SDL_GL_MakeCurrent(m_window, m_context) ? GHOST_kSuccess : GHOST_kFailure;
}
GHOST_TSuccess GHOST_ContextSDL::releaseDrawingContext()
{
if (m_context == nullptr) {
return GHOST_kFailure;
}
/* Untested, may not work. */
return SDL_GL_MakeCurrent(nullptr, nullptr) ? GHOST_kSuccess : GHOST_kFailure;
}
GHOST_TSuccess GHOST_ContextSDL::initializeDrawingContext()
{
#ifdef GHOST_OPENGL_ALPHA
const bool needAlpha = true;
#else
const bool needAlpha = false;
#endif
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, m_contextProfileMask);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, m_contextMajorVersion);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, m_contextMinorVersion);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, m_contextFlags);
SDL_GL_SetAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
if (needAlpha) {
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
}
if (m_stereoVisual) {
SDL_GL_SetAttribute(SDL_GL_STEREO, 1);
}
if (m_window == nullptr) {
m_hidden_window = SDL_CreateWindow("Offscreen Context Windows",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
1,
1,
SDL_WINDOW_OPENGL | SDL_WINDOW_BORDERLESS |
SDL_WINDOW_HIDDEN);
m_window = m_hidden_window;
}
m_context = SDL_GL_CreateContext(m_window);
GHOST_TSuccess success;
if (m_context != nullptr) {
if (!s_sharedContext) {
s_sharedContext = m_context;
}
s_sharedCount++;
success = (SDL_GL_MakeCurrent(m_window, m_context) < 0) ? GHOST_kFailure : GHOST_kSuccess;
initContextGLEW();
initClearGL();
SDL_GL_SwapWindow(m_window);
success = GHOST_kSuccess;
}
else {
success = GHOST_kFailure;
}
return success;
}
GHOST_TSuccess GHOST_ContextSDL::releaseNativeHandles()
{
m_window = nullptr;
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_ContextSDL::setSwapInterval(int interval)
{
if (SDL_GL_SetSwapInterval(interval) == -1) {
return GHOST_kFailure;
}
return GHOST_kSuccess;
}
GHOST_TSuccess GHOST_ContextSDL::getSwapInterval(int &intervalOut)
{
intervalOut = SDL_GL_GetSwapInterval();
return GHOST_kSuccess;
}
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