Shader Extension Proposal #202
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Co-authored-by: Ethan Lee <[email protected]> Co-authored-by: Caleb Cornett <[email protected]>
| @@ -166,7 +166,8 @@ typedef enum FNA3D_CubeMapFace | |||
| typedef enum FNA3D_BufferUsage | |||
| { | |||
| FNA3D_BUFFERUSAGE_NONE, | |||
| FNA3D_BUFFERUSAGE_WRITEONLY | |||
| FNA3D_BUFFERUSAGE_WRITEONLY, | |||
| FNA3D_BUFFERUSAGE_COMPUTE_EXT /* SDL shader extension only */ | |||
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Does this mean 'usable by compute AND write only'? Or is it a bit
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This value is actually completely ignored on every backend, so setting COMPUTE_EXT on the SDL backend is the only place this would actually matter.
include/FNA3D.h
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| */ | ||
| FNA3DAPI void FNA3D_BindComputeTexturesEXT( | ||
| FNA3D_Device *device, | ||
| SDL_GpuComputeTextureBinding *pBindings |
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Is there a blessed way to feed FNA3D textures in to this? Or would you use a SysTexture?
From looking at this it seems like in this proposal, fragment/vertex shaders ('graphics' shaders) can only consume FNA3D textures, and compute shaders can only consume raw SDL_Gpu textures.
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FNA3D texture handles are just sdl_gpu texture handles, but I agree that this is awkward... I'll just wrap the SDL struct and handle it in the implementation
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Actually I was wrong and FNA3D_Driver_SDL was wrapping the texture handles. So nice catch!
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Tried to create something that would be as minimally invasive to the rest of the API as possible. When using the graphics shader extension, the rest of the API is still used normally, only the Effect calls are omitted.
Technically this doesn't break ABI because isRenderTarget on CreateTexture_ is now interpreted as a bitflag, but the value was always 1 or 0 before.