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VideoBackends:D3D12: Dynamic vertex loader support

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This commit is contained in:
TellowKrinkle
2022-06-20 02:55:49 -05:00
parent 936b4d5d0d
commit dae56a24b8
8 changed files with 129 additions and 27 deletions
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31
Source/Core/VideoCommon/UberShaderVertex.cpp
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@ -60,11 +60,34 @@ ShaderCode GenVertexShader(APIType api_type, const ShaderHostConfig& host_config
SSBO_BINDING(1) readonly restrict buffer Vertices {{
uint vertex_buffer[];
}};
)");
if (api_type == APIType::D3D)
{
// Write a function to get an offset into vertex_buffer corresponding to this vertex.
// This must be done differently for D3D compared to OpenGL/Vulkan/Metal, as on OpenGL, etc.,
// gl_VertexID starts counting at the base vertex specified in glDrawElementsBaseVertex,
// while on D3D, SV_VertexID (which spirv-cross translates gl_VertexID into) starts counting
// at 0 regardless of the BaseVertexLocation value passed to DrawIndexed. In both cases,
// offset 0 of vertex_buffer corresponds to index 0 with basevertex set to 0, so we have to
// manually apply the basevertex offset for D3D
// D3D12 uses a root constant for this uniform, since it changes with every draw.
// D3D11 doesn't currently support dynamic vertex loader, and we'll have to figure something
// out for it if we want to support it in the future.
out.Write("UBO_BINDING(std140, 3) uniform DX_Constants {{\n"
" uint base_vertex;\n"
"}};\n\n"
"uint GetVertexBaseOffset() {{\n"
" return (gl_VertexID + base_vertex) * vertex_stride;\n"
"}}\n");
}
else
{
out.Write("uint GetVertexBaseOffset() {{\n"
" return gl_VertexID * vertex_stride;\n"
"}}\n");
}
uint GetVertexBaseOffset() {{
return gl_VertexID * vertex_stride;
}}
out.Write(R"(
uint4 load_input_uint4_ubyte4(uint vtx_offset, uint attr_offset) {{
uint value = vertex_buffer[vtx_offset + attr_offset];
return uint4(value & 0xff, (value >> 8) & 0xff, (value >> 16) & 0xff, value >> 24);