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Reduce the size of the D3D12 vertex shader constants

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This is needed to add more fragment shader constants in the future as we're already at our 64 size limit
This commit is contained in:
Sam Lantinga
2025-09-27 19:18:46 -07:00
parent 5622eef5a8
commit 524ba0a4ad
12 changed files with 698 additions and 897 deletions
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19
src/render/direct3d12/SDL_render_d3d12.c
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@@ -59,8 +59,7 @@ extern "C" {
// Vertex shader, common values
typedef struct
{
Float4X4 model;
Float4X4 projectionAndView;
Float4X4 mpv;
} D3D12_VertexShaderConstants;
// These should mirror the definitions in D3D12_PixelShader_Common.hlsli
@@ -232,7 +231,7 @@ typedef struct
D3D12_SRVPoolNode srvPoolNodes[SDL_D3D12_MAX_NUM_TEXTURES];
// Vertex buffer constants
D3D12_VertexShaderConstants vertexShaderConstantsData;
Float4X4 projectionAndView;
// Cached renderer properties
DXGI_MODE_ROTATION rotation;
@@ -2449,9 +2448,7 @@ static bool D3D12_UpdateViewport(SDL_Renderer *renderer)
* set here (as of this writing, on Dec 26, 2013). When done, store it
* for eventual transfer to the GPU.
*/
data->vertexShaderConstantsData.projectionAndView = MatrixMultiply(
view,
projection);
data->projectionAndView = MatrixMultiply(view, projection);
/* Update the Direct3D viewport, which seems to be aligned to the
* swap buffer's coordinate space, which is always in either
@@ -2694,12 +2691,14 @@ static bool D3D12_SetDrawState(SDL_Renderer *renderer, const SDL_RenderCommand *
rendererData->currentSampler = *sampler;
}
if (updateSubresource == true || SDL_memcmp(&rendererData->vertexShaderConstantsData.model, newmatrix, sizeof(*newmatrix)) != 0) {
SDL_memcpy(&rendererData->vertexShaderConstantsData.model, newmatrix, sizeof(*newmatrix));
if (updateSubresource == true) {
D3D12_VertexShaderConstants vertex_constants;
// Our model matrix is always identity
vertex_constants.mpv = rendererData->projectionAndView;
ID3D12GraphicsCommandList2_SetGraphicsRoot32BitConstants(rendererData->commandList,
0,
32,
&rendererData->vertexShaderConstantsData,
sizeof(vertex_constants) / sizeof(float),
&vertex_constants,
0);
}