/// <summary>
/// Generates a OpenGL sampler based on sampler/texture combination.
/// </summary>
/// <param name="sampler">The D3D sampler (can be null).</param>
/// <param name="texture">The D3D texture.</param>
private void GenerateGLSampler(Variable sampler, Variable texture, bool needsComparison = false)
{
Variable glslSampler;
if (texture == null)
throw new InvalidOperationException();
var samplerKey = new SamplerTextureKey(sampler, texture);
if (!samplerMapping.TryGetValue(samplerKey, out glslSampler))
{
var samplerTypeName = texture.Type.ResolveType().Name.Text.Replace("Texture", "sampler");
// Handle comparison samplers
if (needsComparison)
samplerTypeName += "Shadow";
glslSampler = new Variable(new TypeName(samplerTypeName), texture.Name + (sampler != null ? "_" + sampler.Name : "_NoSampler")) { Span = sampler == null ? texture.Span : sampler.Span };
samplerMapping.Add(samplerKey, glslSampler);
}
}
/// <summary>
/// Generates a OpenGL sampler based on sampler/texture combination.
/// </summary>
/// <param name="sampler">The D3D sampler (can be null).</param>
/// <param name="texture">The D3D texture.</param>
private void GenerateGLSampler(Variable sampler, Variable texture, bool needsComparison = false)
{
Variable glslSampler;
if (texture == null)
throw new InvalidOperationException();
var samplerKey = new SamplerTextureKey(sampler, texture);
if (!samplerMapping.TryGetValue(samplerKey, out glslSampler))
{
var samplerType = texture.Type.ResolveType();
var samplerTypeName = samplerType.Name.Text;
if (samplerTypeName.StartsWith("Texture"))
samplerTypeName = "sampler" + samplerTypeName.Substring("Texture".Length);
else if (samplerTypeName.StartsWith("Buffer"))
samplerTypeName = "samplerBuffer";
// TODO: How do we support this on OpenGL ES 2.0? Cast to int/uint on Load()/Sample()?
var genericSamplerType = samplerType as IGenerics;
if (genericSamplerType != null && genericSamplerType.GenericArguments.Count == 1)
{
var genericArgument = genericSamplerType.GenericArguments[0].ResolveType();
if (TypeBase.GetBaseType(genericArgument) == ScalarType.UInt)
samplerTypeName = "u" + samplerTypeName;
else if (TypeBase.GetBaseType(genericArgument) == ScalarType.Int)
samplerTypeName = "i" + samplerTypeName;
}
// Handle comparison samplers
if (needsComparison)
samplerTypeName += "Shadow";
glslSampler = new Variable(new TypeName(samplerTypeName), texture.Name + (sampler != null ? "_" + sampler.Name : "_NoSampler")) { Span = sampler == null ? texture.Span : sampler.Span };
samplerMapping.Add(samplerKey, glslSampler);
}
}