/// <summary>
/// Creates a vertex and fragment shader pair from the given <see cref="ShaderDescription"/> pair 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="vertexShaderDescription">The vertex 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="fragmentShaderDescription">The fragment 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>A two-element array, containing the vertex shader (element 0) and the fragment shader (element 1).</returns>
public static Shader[] CreateFromSpirv(
this ResourceFactory factory,
ShaderDescription vertexShaderDescription,
ShaderDescription fragmentShaderDescription,
CrossCompileOptions options)
{
GraphicsBackend backend = factory.BackendType;
if (backend == GraphicsBackend.Vulkan)
{
vertexShaderDescription.ShaderBytes = EnsureSpirv(vertexShaderDescription);
fragmentShaderDescription.ShaderBytes = EnsureSpirv(fragmentShaderDescription);
return(new Shader[]
{
factory.CreateShader(ref vertexShaderDescription),
factory.CreateShader(ref fragmentShaderDescription)
});
}
CrossCompileTarget target = GetCompilationTarget(factory.BackendType);
VertexFragmentCompilationResult compilationResult = SpirvCompilation.CompileVertexFragment(
vertexShaderDescription.ShaderBytes,
fragmentShaderDescription.ShaderBytes,
target,
options);
string vertexEntryPoint = (backend == GraphicsBackend.Metal && vertexShaderDescription.EntryPoint == "main")
? "main0"
: vertexShaderDescription.EntryPoint;
byte[] vertexBytes = GetBytes(backend, compilationResult.VertexShader);
Shader vertexShader = factory.CreateShader(new ShaderDescription(
vertexShaderDescription.Stage,
vertexBytes,
vertexEntryPoint));
string fragmentEntryPoint = (backend == GraphicsBackend.Metal && fragmentShaderDescription.EntryPoint == "main")
? "main0"
: fragmentShaderDescription.EntryPoint;
byte[] fragmentBytes = GetBytes(backend, compilationResult.FragmentShader);
Shader fragmentShader = factory.CreateShader(new ShaderDescription(
fragmentShaderDescription.Stage,
fragmentBytes,
fragmentEntryPoint));
return(new Shader[] { vertexShader, fragmentShader });
}
private string[] CompileVertexFragment(ShaderVariantDescription variant)
{
List <string> generatedFiles = new List <string>();
List <Exception> compilationExceptions = new List <Exception>();
byte[] vsBytes = null;
byte[] fsBytes = null;
string vertexFileName = variant.Shaders.FirstOrDefault(vsd => vsd.Stage == ShaderStages.Vertex)?.FileName;
if (vertexFileName != null)
{
try
{
vsBytes = CompileToSpirv(variant, vertexFileName, ShaderStages.Vertex);
//string spvPath = Path.Combine(_outputPath, $"{variant.Name}_{ShaderStages.Vertex.ToString()}.spv");
string spvPath = Path.Combine(_outputPath, $"{variant.Name}.vert.spv");
File.WriteAllBytes(spvPath, vsBytes);
generatedFiles.Add(spvPath);
}
catch (Exception e)
{
compilationExceptions.Add(e);
}
}
string fragmentFileName = variant.Shaders.FirstOrDefault(vsd => vsd.Stage == ShaderStages.Fragment)?.FileName;
if (fragmentFileName != null)
{
try
{
fsBytes = CompileToSpirv(variant, fragmentFileName, ShaderStages.Fragment);
//string spvPath = Path.Combine(_outputPath, $"{variant.Name}_{ShaderStages.Fragment.ToString()}.spv");
string spvPath = Path.Combine(_outputPath, $"{variant.Name}.frag.spv");
File.WriteAllBytes(spvPath, fsBytes);
generatedFiles.Add(spvPath);
}
catch (Exception e)
{
compilationExceptions.Add(e);
}
}
if (compilationExceptions.Count > 0)
{
throw new AggregateException(
$"Errors were encountered when compiling from GLSL to SPIR-V.",
compilationExceptions);
}
foreach (CrossCompileTarget target in variant.Targets)
{
try
{
bool writeReflectionFile = true;
VertexFragmentCompilationResult result = SpirvCompilation.CompileVertexFragment(
vsBytes,
fsBytes,
target,
variant.CrossCompileOptions);
if (result.VertexShader != null)
{
string vsPath = Path.Combine(_outputPath, $"{variant.Name}_Vertex.{GetExtension(target)}");
File.WriteAllText(vsPath, result.VertexShader);
generatedFiles.Add(vsPath);
}
if (result.FragmentShader != null)
{
string fsPath = Path.Combine(_outputPath, $"{variant.Name}_Fragment.{GetExtension(target)}");
File.WriteAllText(fsPath, result.FragmentShader);
generatedFiles.Add(fsPath);
}
if (writeReflectionFile)
{
writeReflectionFile = false;
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());
}