void StimulusDisplay::addContext(int _context_id){
context_ids.push_back(_context_id);
int contextIndex = context_ids.size() - 1;
OpenGLContextLock ctxLock = opengl_context_manager->setCurrent(_context_id);
getCurrentViewportSize(bufferWidths[contextIndex], bufferHeights[contextIndex]);
CVDisplayLinkRef dl;
if (kCVReturnSuccess != CVDisplayLinkCreateWithActiveCGDisplays(&dl)) {
throw SimpleException("Unable to create display link");
}
displayLinks.push_back(dl);
displayLinkContexts.emplace_back(new DisplayLinkContext(this, contextIndex));
if (kCVReturnSuccess != CVDisplayLinkSetOutputCallback(dl,
&StimulusDisplay::displayLinkCallback,
displayLinkContexts.back().get()))
{
throw SimpleException("Unable to set display link output callback");
}
if (kCVReturnSuccess != opengl_context_manager->prepareDisplayLinkForContext(dl, _context_id)) {
throw SimpleException("Unable to associate display link with OpenGL context");
}
if (0 == contextIndex) {
setMainDisplayRefreshRate();
allocateBufferStorage();
}
}
void StimulusDisplay::allocateBufferStorage(int contextIndex) {
if (!(glewIsSupported("GL_EXT_framebuffer_object") && glewIsSupported("GL_EXT_framebuffer_blit"))) {
throw SimpleException("renderer does not support required OpenGL framebuffer extensions");
}
glGenFramebuffersEXT(1, &framebuffers[contextIndex]);
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, framebuffers[contextIndex]);
glGenRenderbuffersEXT(1, &renderbuffers[contextIndex]);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, renderbuffers[contextIndex]);
getCurrentViewportSize(bufferWidths[contextIndex], bufferHeights[contextIndex]);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA8, bufferWidths[contextIndex], bufferHeights[contextIndex]);
glFramebufferRenderbufferEXT(GL_DRAW_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_RENDERBUFFER_EXT,
renderbuffers[contextIndex]);
GLenum status = glCheckFramebufferStatusEXT(GL_DRAW_FRAMEBUFFER_EXT);
if (GL_FRAMEBUFFER_COMPLETE_EXT != status) {
throw SimpleException("OpenGL framebuffer setup failed");
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
}
