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// options.cpp
#include "options.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
namespace renderer_test {
Options gOptions;
SlangResult parseOptions(int* argc, char** argv)
{
int argCount = *argc;
char const* const* argCursor = argv;
char const* const* argEnd = argCursor + argCount;
char const** writeCursor = (char const**) argv;
// first argument is the application name
if( argCursor != argEnd )
{
gOptions.appName = *argCursor++;
}
// now iterate over arguments to collect options
while(argCursor != argEnd)
{
char const* arg = *argCursor++;
if( arg[0] != '-' )
{
*writeCursor++ = arg;
continue;
}
if( strcmp(arg, "--") == 0 )
{
while(argCursor != argEnd)
{
char const* arg = *argCursor++;
*writeCursor++ = arg;
}
break;
}
else if( strcmp(arg, "-o") == 0 )
{
if( argCursor == argEnd )
{
fprintf(stderr, "expected argument for '%s' option\n", arg);
return SLANG_FAIL;
}
gOptions.outputPath = *argCursor++;
}
else if( strcmp(arg, "-hlsl") == 0 )
{
gOptions.rendererID = RendererID::D3D11;
gOptions.inputLanguageID = InputLanguageID::Native;
}
else if( strcmp(arg, "-glsl") == 0 )
{
gOptions.rendererID = RendererID::GL;
gOptions.inputLanguageID = InputLanguageID::Native;
}
else if( strcmp(arg, "-hlsl-rewrite") == 0 )
{
gOptions.rendererID = RendererID::D3D11;
gOptions.inputLanguageID = InputLanguageID::NativeRewrite;
}
else if( strcmp(arg, "-glsl-rewrite") == 0 )
{
gOptions.rendererID = RendererID::GL;
gOptions.inputLanguageID = InputLanguageID::NativeRewrite;
}
else if( strcmp(arg, "-slang") == 0 )
{
gOptions.rendererID = RendererID::D3D11;
gOptions.inputLanguageID = InputLanguageID::Slang;
}
else if( strcmp(arg, "-glsl-cross") == 0 )
{
gOptions.rendererID = RendererID::GL;
gOptions.inputLanguageID = InputLanguageID::Slang;
}
else if( strcmp(arg, "-xslang") == 0 )
{
// This is an option that we want to pass along to Slang
if( argCursor == argEnd )
{
fprintf(stderr, "expected argument for '%s' option\n", arg);
return SLANG_FAIL;
}
if( gOptions.slangArgCount == kMaxSlangArgs )
{
fprintf(stderr, "maximum number of '%s' options exceeded (%d)\n", arg, kMaxSlangArgs);
return SLANG_FAIL;
}
gOptions.slangArgs[gOptions.slangArgCount++] = *argCursor++;
}
else if (strcmp(arg, "-compute") == 0)
{
gOptions.shaderType = ShaderProgramType::Compute;
}
else if (strcmp(arg, "-graphics") == 0)
{
gOptions.shaderType = ShaderProgramType::Graphics;
}
else if (strcmp(arg, "-gcompute") == 0)
{
gOptions.shaderType = ShaderProgramType::GraphicsCompute;
}
else if (strcmp(arg, "-vk") == 0
|| strcmp(arg, "-vulkan") == 0)
{
gOptions.rendererID = RendererID::VK;
}
else if (strcmp(arg, "-d3d12") == 0
|| strcmp(arg, "-dx12") == 0)
{
gOptions.rendererID = RendererID::D3D12;
}
else
{
fprintf(stderr, "unknown option '%s'\n", arg);
return SLANG_FAIL;
}
}
// any arguments left over were positional arguments
argCount = (int)(writeCursor - argv);
argCursor = argv;
argEnd = argCursor + argCount;
// first positional argument is source shader path
if( argCursor != argEnd )
{
gOptions.sourcePath = *argCursor++;
}
// any remaining arguments represent an error
if(argCursor != argEnd)
{
fprintf(stderr, "unexpected arguments\n");
return SLANG_FAIL;
}
*argc = 0;
return SLANG_OK;
}
} // renderer_test
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