// TODO: move this method to an extension method
public ParameterKey <Texture> GetTextureKey(ComputeTextureBase computeTexture, MaterialComputeColorKeys baseKeys)
{
var keyResolved = (ParameterKey <Texture>)(computeTexture.Key ?? baseKeys.TextureBaseKey ?? MaterialKeys.GenericTexture);
return(GetTextureKey(computeTexture.Texture, keyResolved, baseKeys.DefaultTextureValue));
}
public override ShaderSource GenerateShaderSource(MaterialGeneratorContext context, MaterialComputeColorKeys baseKeys)
{
// TODO: Use a generated UsedTexcoordIndex when backing textures
var usedTexcoord = "TEXCOORD" + MaterialUtility.GetTextureIndex(TexcoordIndex);
var textureKey = context.GetTextureKey(this, baseKeys);
var samplerKey = context.GetSamplerKey(Sampler);
UsedKey = textureKey;
var scale = Scale;
var scaleFactor = context.CurrentOverrides.UVScale;
if (scaleFactor != Vector2.One)
{
scale *= scaleFactor;
}
var channelStr = GetTextureChannelAsString();
// "TTEXTURE", "TStream"
ShaderClassSource shaderSource;
// TODO: Workaround bad to have to copy all the new ShaderClassSource(). Check how to improve this
if (context.OptimizeMaterials)
{
var scaleStr = MaterialUtility.GetAsShaderString(scale);
var offsetStr = MaterialUtility.GetAsShaderString(Offset);
// If materials are optimized, we precompute best shader combination (note: will generate shader permutations!)
if (context.IsNotPixelStage)
{
if (Offset != Vector2.Zero)
shaderSource = new ShaderClassSource("ComputeColorTextureLodScaledOffsetSampler", textureKey, usedTexcoord, samplerKey, channelStr, scaleStr, offsetStr, 0.0f);
else if (scale != Vector2.One)
shaderSource = new ShaderClassSource("ComputeColorTextureLodScaledSampler", textureKey, usedTexcoord, samplerKey, channelStr, scaleStr, 0.0f);
else
shaderSource = new ShaderClassSource("ComputeColorTextureLodSampler", textureKey, usedTexcoord, samplerKey, channelStr, 0.0f);
}
else
{
if (Offset != Vector2.Zero)
shaderSource = new ShaderClassSource("ComputeColorTextureScaledOffsetSampler", textureKey, usedTexcoord, samplerKey, channelStr, scaleStr, offsetStr);
else if (scale != Vector2.One)
shaderSource = new ShaderClassSource("ComputeColorTextureScaledSampler", textureKey, usedTexcoord, samplerKey, channelStr, scaleStr);
else
shaderSource = new ShaderClassSource("ComputeColorTextureSampler", textureKey, usedTexcoord, samplerKey, channelStr);
}
}
else
{
// Try to avoid shader permutations, by putting UV scaling/offset in shader parameters
var textureScale = (ParameterKey<Vector2>)context.GetParameterKey(MaterialKeys.TextureScale);
var textureOffset = (ParameterKey<Vector2>)context.GetParameterKey(MaterialKeys.TextureOffset);
context.Parameters.Set(textureScale, scale);
context.Parameters.Set(textureOffset, Offset);
if (context.IsNotPixelStage)
{
shaderSource = new ShaderClassSource("ComputeColorTextureLodScaledOffsetDynamicSampler", textureKey, usedTexcoord, samplerKey, channelStr, textureScale, textureOffset, 0.0f);
}
else
{
shaderSource = new ShaderClassSource("ComputeColorTextureScaledOffsetDynamicSampler", textureKey, usedTexcoord, samplerKey, channelStr, textureScale, textureOffset);
}
}
return shaderSource;
}