void DeferredLightingEffect::prepare(RenderArgs* args) {
// clear the normal and specular buffers
auto textureCache = DependencyManager::get<TextureCache>();
textureCache->setPrimaryDrawBuffers(false, true, false);
glClear(GL_COLOR_BUFFER_BIT);
textureCache->setPrimaryDrawBuffers(false, false, true);
// clearing to zero alpha for specular causes problems on my Nvidia card; clear to lowest non-zero value instead
const float MAX_SPECULAR_EXPONENT = 128.0f;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f / MAX_SPECULAR_EXPONENT);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
textureCache->setPrimaryDrawBuffers(true, false, false);
}
void TextureCache::setPrimaryDrawBuffers(bool color, bool normal, bool specular) {
gpu::Batch batch;
setPrimaryDrawBuffers(batch, color, normal, specular);
gpu::GLBackend::renderBatch(batch);
}
