QOpenGLFramebufferObject* GlowEffect::render(bool toTexture) {
PerformanceTimer perfTimer("glowEffect");
TextureCache* textureCache = DependencyManager::get<TextureCache>();
QOpenGLFramebufferObject* primaryFBO = textureCache->getPrimaryFramebufferObject();
primaryFBO->release();
glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
QOpenGLFramebufferObject* destFBO = toTexture ?
textureCache->getSecondaryFramebufferObject() : NULL;
if (!Menu::getInstance()->isOptionChecked(MenuOption::EnableGlowEffect) || _isEmpty) {
// copy the primary to the screen
if (destFBO && QOpenGLFramebufferObject::hasOpenGLFramebufferBlit()) {
QOpenGLFramebufferObject::blitFramebuffer(destFBO, primaryFBO);
} else {
maybeBind(destFBO);
if (!destFBO) {
glViewport(0, 0, Application::getInstance()->getGLWidget()->getDeviceWidth(),
Application::getInstance()->getGLWidget()->getDeviceHeight());
}
glEnable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
glColor3f(1.0f, 1.0f, 1.0f);
renderFullscreenQuad();
glDisable(GL_TEXTURE_2D);
glEnable(GL_LIGHTING);
maybeRelease(destFBO);
}
} else {
// diffuse into the secondary/tertiary (alternating between frames)
QOpenGLFramebufferObject* oldDiffusedFBO =
textureCache->getSecondaryFramebufferObject();
QOpenGLFramebufferObject* newDiffusedFBO =
textureCache->getTertiaryFramebufferObject();
if (_isOddFrame) {
qSwap(oldDiffusedFBO, newDiffusedFBO);
}
newDiffusedFBO->bind();
if (_isFirstFrame) {
glClear(GL_COLOR_BUFFER_BIT);
} else {
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, oldDiffusedFBO->texture());
_diffuseProgram->bind();
QSize size = primaryFBO->size();
_diffuseProgram->setUniformValue(_diffusionScaleLocation, 1.0f / size.width(), 1.0f / size.height());
renderFullscreenQuad();
_diffuseProgram->release();
}
newDiffusedFBO->release();
// add diffused texture to the primary
glBindTexture(GL_TEXTURE_2D, newDiffusedFBO->texture());
if (toTexture) {
destFBO = oldDiffusedFBO;
}
maybeBind(destFBO);
if (!destFBO) {
glViewport(0, 0,
Application::getInstance()->getGLWidget()->getDeviceWidth(),
Application::getInstance()->getGLWidget()->getDeviceHeight());
}
_addSeparateProgram->bind();
renderFullscreenQuad();
_addSeparateProgram->release();
maybeRelease(destFBO);
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE0);
}
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glBindTexture(GL_TEXTURE_2D, 0);
_isFirstFrame = false;
return destFBO;
}
