void phongShaderOverride::updateShader(
MHWRender::MShaderInstance& shader,
const MHWRender::MAttributeParameterMappingList& mappings)
{
// Cache resolved name if found to avoid lookup on every update
if (fResolvedSpecularColorName.length() == 0)
{
const MHWRender::MAttributeParameterMapping* mapping =
mappings.findByParameterName("specularColor");
if (mapping)
{
fResolvedSpecularColorName = mapping->resolvedParameterName();
}
}
// Set parameter
if (fResolvedSpecularColorName.length() > 0)
{
shader.setParameter(fResolvedSpecularColorName, fSpecularColor);
}
}
void simpleNoiseShaderOverride::updateShader(
MHWRender::MShaderInstance& shader,
const MHWRender::MAttributeParameterMappingList& mappings)
{
// Handle resolved name caching
if (fResolvedNoiseMapName.length() == 0)
{
const MHWRender::MAttributeParameterMapping* mapping =
mappings.findByParameterName("noiseLookupMap");
if (mapping)
{
fResolvedNoiseMapName = mapping->resolvedParameterName();
}
}
if (fResolvedNoiseSamplerName.length() == 0)
{
const MHWRender::MAttributeParameterMapping* mapping =
mappings.findByParameterName("noiseLookupMapSampler");
if (mapping)
{
fResolvedNoiseSamplerName = mapping->resolvedParameterName();
}
}
// Set the parameters on the shader
if (fResolvedNoiseMapName.length() > 0 &&
fResolvedNoiseSamplerName.length() > 0)
{
// Set a point-clamp sampler to the shader
if (!fNoiseSamplerState)
{
MHWRender::MSamplerStateDesc desc;
desc.filter = MHWRender::MSamplerState::kMinMagMipPoint;
desc.addressU = desc.addressV = desc.addressW =
MHWRender::MSamplerState::kTexClamp;
desc.minLOD = 0;
desc.maxLOD = 0;
fNoiseSamplerState =
MHWRender::MStateManager::acquireSamplerState(desc);
}
if (fNoiseSamplerState)
{
shader.setParameter(fResolvedNoiseSamplerName, *fNoiseSamplerState);
}
// Generate the noise lookup table texture if necessary
if (!fNoiseTexture)
{
MHWRender::MRenderer* renderer =
MHWRender::MRenderer::theRenderer();
MHWRender::MTextureManager* textureMgr =
renderer ? renderer->getTextureManager() : NULL;
if (textureMgr)
{
// First, search the texture cache to see if another instance of
// this override has already generated the texture. We can reuse
// it to save GPU memory since the noise data is constant.
fNoiseTexture =
textureMgr->findTexture(sNoiseLookupTextureName);
// Not in cache, so we need to actually build the texture
if (!fNoiseTexture)
{
// Get Maya's noise table
const std::vector<float>& noiseData = GetMayaNoiseTable();
// Create a 3D texture containing the data
MHWRender::MTextureDescription desc;
desc.setToDefault2DTexture();
desc.fWidth = desc.fHeight = desc.fDepth =
MRenderUtil::noiseTableCubeSide();
desc.fFormat = MHWRender::kR32_FLOAT;
desc.fTextureType = MHWRender::kVolumeTexture;
desc.fMipmaps = 1;
fNoiseTexture = textureMgr->acquireTexture(
sNoiseLookupTextureName,
desc,
(const void*)&(noiseData[0]),
false);
}
}
}
// Set the texture to the shader instance
if (fNoiseTexture)
{
MHWRender::MTextureAssignment textureAssignment;
textureAssignment.texture = fNoiseTexture;
shader.setParameter(fResolvedNoiseMapName, textureAssignment);
}
}
}