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Get SDL_GPUVertexElementFormat from IOVarMetadata #185

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Get SDL_GPUVertexElementFormat from IOVarMetadata #185

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6 changes: 6 additions & 0 deletions include/SDL3_shadercross/SDL_shadercross.h
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Original file line number Diff line number Diff line change
Expand Up @@ -345,6 +345,12 @@ extern SDL_DECLSPEC void * SDLCALL SDL_ShaderCross_CompileSPIRVFromHLSL(
const SDL_ShaderCross_HLSL_Info *info,
size_t *size);

/**
* Returns the SDL_GPUVertexElementFormat from a variable's SDL_ShaderCross_IOVarMetadata
*/
extern SDL_DECLSPEC SDL_GPUVertexElementFormat SDLCALL SDL_ShaderCross_GPUVertexElementFormatFromIOVarMetadata(
const SDL_ShaderCross_IOVarMetadata *meta);

#ifdef __cplusplus
}
#endif
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25 changes: 25 additions & 0 deletions src/SDL_shadercross.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2650,3 +2650,28 @@ SDL_GPUShaderFormat SDL_ShaderCross_GetHLSLShaderFormats(void)

return supportedFormats;
}

SDL_GPUVertexElementFormat SDL_ShaderCross_GPUVertexElementFormatFromIOVarMetadata(
const SDL_ShaderCross_IOVarMetadata *meta)
{
if (meta == NULL) {
SDL_InvalidParamError("metadata");
return SDL_GPU_VERTEXELEMENTFORMAT_INVALID;
}

switch (meta->vector_type) {
case SDL_SHADERCROSS_IOVAR_TYPE_INT8: return SDL_GPU_VERTEXELEMENTFORMAT_BYTE2 + meta->vector_size/2 - 1;
case SDL_SHADERCROSS_IOVAR_TYPE_UINT8: return SDL_GPU_VERTEXELEMENTFORMAT_UBYTE2 + meta->vector_size/2 - 1;

case SDL_SHADERCROSS_IOVAR_TYPE_INT16: return SDL_GPU_VERTEXELEMENTFORMAT_SHORT2 + meta->vector_size/2 - 1;
case SDL_SHADERCROSS_IOVAR_TYPE_UINT16: return SDL_GPU_VERTEXELEMENTFORMAT_USHORT2 + meta->vector_size/2 - 1;
case SDL_SHADERCROSS_IOVAR_TYPE_FLOAT16: return SDL_GPU_VERTEXELEMENTFORMAT_HALF2 + meta->vector_size/2 - 1;

case SDL_SHADERCROSS_IOVAR_TYPE_INT32: return SDL_GPU_VERTEXELEMENTFORMAT_INT + meta->vector_size - 1;
case SDL_SHADERCROSS_IOVAR_TYPE_UINT32: return SDL_GPU_VERTEXELEMENTFORMAT_UINT + meta->vector_size - 1;
case SDL_SHADERCROSS_IOVAR_TYPE_FLOAT32: return SDL_GPU_VERTEXELEMENTFORMAT_FLOAT + meta->vector_size - 1;

/* SDL_gpu api does not include 64-bit types in SDL_GPUVertexElementFormat */
default: return SDL_GPU_VERTEXELEMENTFORMAT_INVALID;
}
}