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// slang-support.cpp
#define _CRT_SECURE_NO_WARNINGS 1
#include "slang-support.h"
#include <assert.h>
#include <stdio.h>
namespace renderer_test {
struct SlangShaderCompilerWrapper : public ShaderCompiler
{
ShaderCompiler* innerCompiler;
SlangCompileTarget target;
SlangSourceLanguage sourceLanguage;
virtual ShaderProgram* compileProgram(ShaderCompileRequest const& request) override
{
SlangSession* slangSession = spCreateSession(NULL);
SlangCompileRequest* slangRequest = spCreateCompileRequest(slangSession);
spSetCodeGenTarget(slangRequest, target);
// Define a macro so that shader code in a test can detect what language we
// are nominally working with.
char const* langDefine = nullptr;
switch (sourceLanguage)
{
case SLANG_SOURCE_LANGUAGE_GLSL: langDefine = "__GLSL__"; break;
case SLANG_SOURCE_LANGUAGE_HLSL: langDefine = "__HLSL__"; break;
case SLANG_SOURCE_LANGUAGE_SLANG: langDefine = "__SLANG__"; break;
default:
assert(!"unexpected");
break;
}
spAddPreprocessorDefine(slangRequest, langDefine, "1");
// If we are dealing with GLSL input, then we need to set up
// Slang to pass through to glslang instead of actually running
// the compiler (this is a workaround to make direct comparisons
// possible)
if (sourceLanguage == SLANG_SOURCE_LANGUAGE_GLSL)
{
spSetPassThrough(slangRequest, SLANG_PASS_THROUGH_GLSLANG);
}
// Preocess any additional command-line options specified for Slang using
// the `-xslang <arg>` option to `render-test`.
spProcessCommandLineArguments(slangRequest, &gOptions.slangArgs[0], gOptions.slangArgCount);
int computeTranslationUnit = 0;
int vertexTranslationUnit = 0;
int fragmentTranslationUnit = 0;
char const* vertexEntryPointName = request.vertexShader.name;
char const* fragmentEntryPointName = request.fragmentShader.name;
char const* computeEntryPointName = request.computeShader.name;
if (sourceLanguage == SLANG_SOURCE_LANGUAGE_GLSL)
{
// GLSL presents unique challenges because, frankly, it got the whole
// compilation model wrong. One aspect of working around this is that
// we will compile the same source file multiple times: once per
// entry point, and we will have different preprocessor definitions
// active in each case.
vertexTranslationUnit = spAddTranslationUnit(slangRequest, sourceLanguage, nullptr);
spAddTranslationUnitSourceString(slangRequest, vertexTranslationUnit, request.source.path, request.source.dataBegin);
spTranslationUnit_addPreprocessorDefine(slangRequest, vertexTranslationUnit, "__GLSL_VERTEX__", "1");
vertexEntryPointName = "main";
fragmentTranslationUnit = spAddTranslationUnit(slangRequest, sourceLanguage, nullptr);
spAddTranslationUnitSourceString(slangRequest, fragmentTranslationUnit, request.source.path, request.source.dataBegin);
spTranslationUnit_addPreprocessorDefine(slangRequest, fragmentTranslationUnit, "__GLSL_FRAGMENT__", "1");
fragmentEntryPointName = "main";
computeTranslationUnit = spAddTranslationUnit(slangRequest, sourceLanguage, nullptr);
spAddTranslationUnitSourceString(slangRequest, computeTranslationUnit, request.source.path, request.source.dataBegin);
spTranslationUnit_addPreprocessorDefine(slangRequest, computeTranslationUnit, "__GLSL_COMPUTE__", "1");
computeEntryPointName = "main";
}
else
{
int translationUnit = spAddTranslationUnit(slangRequest, sourceLanguage, nullptr);
spAddTranslationUnitSourceString(slangRequest, translationUnit, request.source.path, request.source.dataBegin);
vertexTranslationUnit = translationUnit;
fragmentTranslationUnit = translationUnit;
computeTranslationUnit = translationUnit;
}
ShaderProgram * result = nullptr;
Slang::List<const char*> rawTypeNames;
for (auto typeName : request.entryPointTypeArguments)
rawTypeNames.Add(typeName.Buffer());
if (request.computeShader.name)
{
int computeEntryPoint = spAddEntryPointEx(slangRequest, computeTranslationUnit,
computeEntryPointName,
spFindProfile(slangSession, request.computeShader.profile),
(int)rawTypeNames.Count(),
rawTypeNames.Buffer());
spSetLineDirectiveMode(slangRequest, SLANG_LINE_DIRECTIVE_MODE_NONE);
int compileErr = spCompile(slangRequest);
if (auto diagnostics = spGetDiagnosticOutput(slangRequest))
{
fprintf(stderr, "%s", diagnostics);
}
if (!compileErr)
{
ShaderCompileRequest innerRequest = request;
size_t codeSize = 0;
char const* code = (char const*) spGetEntryPointCode(slangRequest, computeEntryPoint, &codeSize);
innerRequest.computeShader.source.dataBegin = code;
innerRequest.computeShader.source.dataEnd = code + codeSize;
result = innerCompiler->compileProgram(innerRequest);
}
}
else
{
int vertexEntryPoint = spAddEntryPointEx(slangRequest, vertexTranslationUnit, vertexEntryPointName, spFindProfile(slangSession, request.vertexShader.profile), (int)rawTypeNames.Count(), rawTypeNames.Buffer());
int fragmentEntryPoint = spAddEntryPointEx(slangRequest, fragmentTranslationUnit, fragmentEntryPointName, spFindProfile(slangSession, request.fragmentShader.profile), (int)rawTypeNames.Count(), rawTypeNames.Buffer());
int compileErr = spCompile(slangRequest);
if (auto diagnostics = spGetDiagnosticOutput(slangRequest))
{
// TODO(tfoley): re-enable when I get a logging solution in place
// OutputDebugStringA(diagnostics);
fprintf(stderr, "%s", diagnostics);
}
if (!compileErr)
{
ShaderCompileRequest innerRequest = request;
size_t vertexCodeSize = 0;
char const* vertexCode = (char const*) spGetEntryPointCode(slangRequest, vertexEntryPoint, &vertexCodeSize);
size_t fragmentCodeSize = 0;
char const* fragmentCode = (char const*) spGetEntryPointCode(slangRequest, fragmentEntryPoint, &fragmentCodeSize);
innerRequest.vertexShader.source.dataBegin = vertexCode;
innerRequest.vertexShader.source.dataEnd = vertexCode + vertexCodeSize;
innerRequest.fragmentShader.source.dataBegin = fragmentCode;
innerRequest.fragmentShader.source.dataEnd = fragmentCode + fragmentCodeSize;
result = innerCompiler->compileProgram(innerRequest);
}
}
// We clean up the Slang compilation context and result *after*
// we have run the downstream compiler, because Slang
// owns the memory allocation for the generated text, and will
// free it when we destroy the compilation result.
spDestroyCompileRequest(slangRequest);
spDestroySession(slangSession);
return result;
}
};
ShaderCompiler* createSlangShaderCompiler(
ShaderCompiler* innerCompiler,
SlangSourceLanguage sourceLanguage,
SlangCompileTarget target)
{
auto result = new SlangShaderCompilerWrapper();
result->innerCompiler = innerCompiler;
result->sourceLanguage = sourceLanguage;
result->target = target;
return result;
}
} // renderer_test
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