/// <summary>
/// Creates a compute shader from the given <see cref="ShaderDescription"/> containing SPIR-V bytecode or GLSL source
/// code.
/// </summary>
/// <param name="factory">The <see cref="ResourceFactory"/> used to compile the translated shader code.</param>
/// <param name="computeShaderDescription">The compute shader's description.
/// <see cref="ShaderDescription.ShaderBytes"/> should contain SPIR-V bytecode or Vulkan-style GLSL source code which
/// can be compiled to SPIR-V.</param>
/// <param name="options">The <see cref="CrossCompileOptions"/> which will control the parameters used to translate the
/// shaders from SPIR-V to the target language.</param>
/// <returns>The compiled compute <see cref="Shader"/>.</returns>
public static Shader CreateFromSpirv(
this ResourceFactory factory,
ShaderDescription computeShaderDescription,
CrossCompileOptions options)
{
GraphicsBackend backend = factory.BackendType;
if (backend == GraphicsBackend.Vulkan)
{
computeShaderDescription.ShaderBytes = EnsureSpirv(computeShaderDescription);
return(factory.CreateShader(ref computeShaderDescription));
}
CrossCompileTarget target = GetCompilationTarget(factory.BackendType);
ComputeCompilationResult compilationResult = SpirvCompilation.CompileCompute(
computeShaderDescription.ShaderBytes,
target,
options);
string computeEntryPoint = (backend == GraphicsBackend.Metal && computeShaderDescription.EntryPoint == "main")
? "main0"
: computeShaderDescription.EntryPoint;
byte[] computeBytes = GetBytes(backend, compilationResult.ComputeShader);
return(factory.CreateShader(new ShaderDescription(
computeShaderDescription.Stage,
computeBytes,
computeEntryPoint)));
}
private string[] CompileCompute(ShaderVariantDescription variant)
{
List <string> generatedFiles = new List <string>();
byte[] csBytes = CompileToSpirv(variant, variant.Shaders[0].FileName, ShaderStages.Compute);
string spvPath = Path.Combine(_outputPath, $"{variant.Name}_{ShaderStages.Compute.ToString()}.spv");
File.WriteAllBytes(spvPath, csBytes);
generatedFiles.Add(spvPath);
List <Exception> compilationExceptions = new List <Exception>();
foreach (CrossCompileTarget target in variant.Targets)
{
try
{
ComputeCompilationResult result = SpirvCompilation.CompileCompute(csBytes, target, variant.CrossCompileOptions);
string csPath = Path.Combine(_outputPath, $"{variant.Name}_Compute.{GetExtension(target)}");
File.WriteAllText(csPath, result.ComputeShader);
generatedFiles.Add(csPath);
string reflectionPath = Path.Combine(_outputPath, $"{variant.Name}_ReflectionInfo.json");
JsonSerializer serializer = new JsonSerializer();
serializer.Formatting = Formatting.Indented;
StringEnumConverter enumConverter = new StringEnumConverter();
serializer.Converters.Add(enumConverter);
using (StreamWriter sw = File.CreateText(reflectionPath))
using (JsonTextWriter jtw = new JsonTextWriter(sw))
{
serializer.Serialize(jtw, result.Reflection);
}
generatedFiles.Add(reflectionPath);
}
catch (Exception e)
{
compilationExceptions.Add(e);
}
}
if (compilationExceptions.Count > 0)
{
throw new AggregateException($"Errors were encountered when compiling shader variant(s).", compilationExceptions);
}
return(generatedFiles.ToArray());
}