void OpenGLRenderer::SetRenderState(RenderState renderState, bool enable) {
switch(renderState) {
case AlphaBlending: {
setGLState(GL_BLEND, enable);
break;
}
case AlphaTest: {
setGLState(GL_ALPHA_TEST, enable);
break;
}
case ColorKey: {
SetRenderState(AlphaTest, enable);
if(enable)
SetAlphaFunc(CmpNotEqual, 0.0f);
break;
}
case DepthTest: {
setGLState(GL_DEPTH_TEST, enable);
break;
}
case DepthWrite: {
glDepthMask(enable ? GL_TRUE : GL_FALSE);
break;
}
case Fog: {
setGLState(GL_FOG, enable);
break;
}
case Lighting: {
setGLState(GL_LIGHTING, enable);
break;
}
case ZBias: {
setGLState(GL_POLYGON_OFFSET_FILL, enable);
break;
}
default:
LogWarning << "unsupported render state: " << renderState;
}
CHECK_GL;
}
void OpenGLRenderer::SetRenderState(RenderState renderState, bool enable) {
switch(renderState) {
case AlphaBlending: {
if(m_hasBlend == enable) {
return;
}
/*
* When rendering color-keyed textures with GL_BLEND enabled we still
* need to 'discard' transparent texels, as blending might not use the src alpha!
* On the other hand, we can't use GL_SAMPLE_ALPHA_TO_COVERAGE when blending
* as that could result in the src alpha being applied twice (e.g. for text).
* So we must toggle between alpha to coverage and alpha test when toggling blending.
* TODO Fix it so that the apha channel from the color-keyed textures is
* always used as part of the blending factor.
*/
bool colorkey = m_hasColorKey;
if(colorkey && m_hasMSAA) {
SetRenderState(ColorKey, false);
}
m_hasBlend = enable;
if(colorkey && m_hasMSAA) {
SetRenderState(ColorKey, true);
}
setGLState(GL_BLEND, enable);
break;
}
case ColorKey: {
if(m_hasColorKey == enable) {
return;
}
m_hasColorKey = enable;
if(m_hasMSAA && !m_hasBlend) {
// TODO(option-video) add a config option for this
setGLState(GL_SAMPLE_ALPHA_TO_COVERAGE, enable);
} else {
setGLState(GL_ALPHA_TEST, enable);
if(enable) {
SetAlphaFunc(CmpNotEqual, 0.0f);
}
}
break;
}
case DepthTest: {
glDepthFunc(enable ? GL_LEQUAL : GL_ALWAYS);
break;
}
case DepthWrite: {
glDepthMask(enable ? GL_TRUE : GL_FALSE);
break;
}
case Fog: {
setGLState(GL_FOG, enable);
break;
}
case Lighting: {
setGLState(GL_LIGHTING, enable);
break;
}
case ZBias: {
setGLState(GL_POLYGON_OFFSET_FILL, enable);
break;
}
default:
LogWarning << "Unsupported render state: " << renderState;
}
}