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// This is a small program to precompile hlsl library to a header file,
// used only for fixed function shader generation with d3d11 linker.
// It also generates 8 * 4 combinations of texture sampling functions.
//
// Useful because fxc doesn't support lib_* targets,
// but once it does it's probably a good idea to deprecate this.
#include <windows.h>
#include <d3d11.h>
#include <d3dcommon.h>
#include <d3dcompiler.h>
#include <cstdio>
#include <cassert>
typedef HRESULT (WINAPI *D3DCompileFunc)(
const void* pSrcData,
unsigned long SrcDataSize,
const char* pFileName,
const D3D10_SHADER_MACRO* pDefines,
void* pInclude,
const char* pEntrypoint,
const char* pTarget,
unsigned int Flags1,
unsigned int Flags2,
ID3DBlob** ppCode,
ID3DBlob** ppErrorMsgs
);
const char* dllName = "D3DCompiler_47.dll";
const char* readFile(const char* path)
{
FILE* f = fopen(path, "rb");
if (!f)
return NULL;
fseek(f, 0, SEEK_END);
size_t s = ftell(f);
fseek(f, 0, SEEK_SET);
char* out = (char*)malloc(s+1);
fread(out, s, 1, f);
out[s] = '\0';
fclose(f);
return out;
}
void printCompiledShader(ID3DBlob* shader, const char* name, FILE* out)
{
const unsigned char* data = (const unsigned char*)shader->GetBufferPointer();
size_t size = (size_t)shader->GetBufferSize();
fprintf(out, "const BYTE %s[] = { \n", name);
for(int i = 0; i < size; ++i) {
fprintf(out, ((i==size-1) ? "%d" : "%d,"), (int)data[i]);
if((i+1) % 16 == 0)
fprintf(out, "\n");
}
fprintf(out, "\n};\n");
}
// type: 0 - 2d, 1 - 2d proj, 2 - 3d, 3 - cube
const char* generateTextureSamplingLib(int type, int unit)
{
const int maxSize = 2048;
static char hlsl[maxSize];
const char* textureTypes[] = { "Texture2D", "Texture2D", "Texture3D", "TextureCube" };
const char* coordTypes[] = {"float2", "float4", "float3", "float3" };
const char* coords[] = {"uv.xy", "uv.xy/uv.w", "uv.xyz", "uv.xyz" };
sprintf(hlsl,
"%s<float4> Tex%d : register(t%d);\n"
"SamplerState Smp%d : register(s%d);\n"
"export float4 LoadTex%d(%s uv) { return Tex%d.Sample(Smp%d, %s); }\n",
textureTypes[type], unit, unit, unit, unit, unit,
coordTypes[type], unit, unit, coords[type]
);
return hlsl;
}
const char* textureSamplingLibName(int type, int unit)
{
static const char* typeStr[] = {"2D", "Proj", "3D", "Cube"};
static char name[32];
sprintf(name, "g_FFSampleTex%s%d", typeStr[type], unit);
return name;
}
// Since we can't bind multiple textures to the same texture register,
// we'll have to generate 4 * 8 sampling functions and link the correct ones
// at runtime.
void printTextureSampling(D3DCompileFunc compileFunc, FILE* out)
{
// Print compiled shaders
for (int type = 0; type < 4; ++type)
{
for (int unit = 0; unit < 8; ++unit)
{
const char* name = textureSamplingLibName(type, unit);
const char* hlsl = generateTextureSamplingLib(type, unit);
ID3DBlob* errors;
ID3DBlob* shader;
HRESULT hr = compileFunc(
hlsl, strlen(hlsl), name, NULL, NULL, NULL,
"lib_4_0_level_9_1", D3DCOMPILE_OPTIMIZATION_LEVEL3, 0, &shader, &errors
);
assert(SUCCEEDED(hr));
printCompiledShader(shader, name, out);
shader->Release();
}
}
// Print index to all shaders
fprintf(out, "const BYTE* g_FFSampleTexLib[] = { \n");
for (int type = 0; type < 4; ++type)
for (int unit = 0; unit < 8; ++unit)
fprintf(out, "%s,\n", textureSamplingLibName(type, unit));
fprintf(out, "};\n");
// Print sizes of all shaders
fprintf(out, "const size_t g_FFSampleTexLibSize[] = { \n");
for (int type = 0; type < 4; ++type)
for (int unit = 0; unit < 8; ++unit)
fprintf(out, "sizeof(%s),\n", textureSamplingLibName(type, unit));
fprintf(out, "};\n");
}
int main(int argc, const char** argv)
{
if (argc != 3)
{
printf("Usage: CompileShaderLib.exe src.hlsl out.h\n");
return 1;
}
HMODULE dll = LoadLibraryA (dllName);
if (!dll)
{
printf("Can't load %s\n", dllName);
return 1;
}
D3DCompileFunc compileFunc = (D3DCompileFunc) GetProcAddress(dll, "D3DCompile");
if (!compileFunc)
{
printf("Can't get D3DCompile function address\n");
return 1;
}
const char* hlsl = readFile(argv[1]);
ID3DBlob* errors;
ID3DBlob* shader;
HRESULT hr = compileFunc(
hlsl, strlen(hlsl), argv[1], NULL, NULL, NULL,
"lib_4_0_level_9_1", D3DCOMPILE_OPTIMIZATION_LEVEL3, 0, &shader, &errors
);
if (FAILED(hr))
{
printf("Failed to compile, 0x%x:\n%s\n", hr, errors ? errors->GetBufferPointer() : "");
return 1;
}
free((void*)hlsl);
FILE* out = fopen(argv[2], "w");
fprintf(out, "// File autogenerated by CompileShaderLib.exe\n");
printCompiledShader(shader, "g_FFShaderLibrary", out);
shader->Release();
printTextureSampling(compileFunc, out);
fclose(out);
return 0;
}
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