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gpu: alpha-to-coverage support

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This commit is contained in:
Caleb Cornett
2025-04-03 17:47:37 -04:00
committed by Sam Lantinga
parent d6d2c958a4
commit 44710a248c
6 changed files with 75 additions and 3 deletions
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2
include/SDL3/SDL_gpu.h
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@@ -1767,7 +1767,7 @@ typedef struct SDL_GPUMultisampleState
SDL_GPUSampleCount sample_count; /**< The number of samples to be used in rasterization. */
Uint32 sample_mask; /**< Reserved for future use. Must be set to 0. */
bool enable_mask; /**< Reserved for future use. Must be set to false. */
Uint8 padding1;
bool enable_alpha_to_coverage; /**< true enables the alpha-to-coverage feature. */
Uint8 padding2;
Uint8 padding3;
} SDL_GPUMultisampleState;

6
src/gpu/SDL_gpu.c
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@@ -827,6 +827,12 @@ SDL_GPUGraphicsPipeline *SDL_CreateGPUGraphicsPipeline(
SDL_assert_release(!"Format is not supported for color targets on this device!");
return NULL;
}
if (graphicsPipelineCreateInfo->multisample_state.enable_alpha_to_coverage &&
(IsIntegerFormat(graphicsPipelineCreateInfo->target_info.color_target_descriptions[i].format)
|| IsCompressedFormat(graphicsPipelineCreateInfo->target_info.color_target_descriptions[i].format))) {
SDL_assert_release(!"Format is not compatible with alpha-to-coverage!");
return NULL;
}
if (graphicsPipelineCreateInfo->target_info.color_target_descriptions[i].blend_state.enable_blend) {
const SDL_GPUColorTargetBlendState *blend_state = &graphicsPipelineCreateInfo->target_info.color_target_descriptions[i].blend_state;
CHECK_BLENDFACTOR_ENUM_INVALID(blend_state->src_color_blendfactor, NULL)

65
src/gpu/SDL_sysgpu.h
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@@ -373,6 +373,71 @@ static inline bool IsIntegerFormat(
}
}
static inline bool IsCompressedFormat(
SDL_GPUTextureFormat format)
{
switch (format) {
case SDL_GPU_TEXTUREFORMAT_BC1_RGBA_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC1_RGBA_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_BC2_RGBA_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC2_RGBA_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_BC3_RGBA_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC3_RGBA_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_BC4_R_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC5_RG_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_FLOAT:
case SDL_GPU_TEXTUREFORMAT_BC6H_RGB_UFLOAT:
case SDL_GPU_TEXTUREFORMAT_BC7_RGBA_UNORM:
case SDL_GPU_TEXTUREFORMAT_BC7_RGBA_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_4x4_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x4_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x5_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x5_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x6_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x5_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x6_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x8_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x5_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x6_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x8_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x10_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x10_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x12_UNORM:
case SDL_GPU_TEXTUREFORMAT_ASTC_4x4_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x4_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x5_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x5_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x6_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x5_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x6_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x8_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x5_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x6_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x8_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x10_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x10_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x12_UNORM_SRGB:
case SDL_GPU_TEXTUREFORMAT_ASTC_4x4_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x4_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_5x5_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x5_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_6x6_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x5_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x6_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_8x8_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x5_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x6_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x8_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_10x10_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x10_FLOAT:
case SDL_GPU_TEXTUREFORMAT_ASTC_12x12_FLOAT:
return true;
default:
return false;
}
}
static inline Uint32 IndexSize(SDL_GPUIndexElementSize size)
{
return (size == SDL_GPU_INDEXELEMENTSIZE_16BIT) ? 2 : 4;

2
src/gpu/d3d12/SDL_gpu_d3d12.c
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@@ -2819,7 +2819,7 @@ static bool D3D12_INTERNAL_ConvertBlendState(
}
SDL_zerop(blendDesc);
blendDesc->AlphaToCoverageEnable = FALSE;
blendDesc->AlphaToCoverageEnable = pipelineInfo->multisample_state.enable_alpha_to_coverage;
blendDesc->IndependentBlendEnable = FALSE;
for (UINT i = 0; i < MAX_COLOR_TARGET_BINDINGS; i += 1) {

1
src/gpu/metal/SDL_gpu_metal.m
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@@ -1135,6 +1135,7 @@ static SDL_GPUGraphicsPipeline *METAL_CreateGraphicsPipeline(
// Multisample
pipelineDescriptor.rasterSampleCount = SDLToMetal_SampleCount[createinfo->multisample_state.sample_count];
pipelineDescriptor.alphaToCoverageEnabled = createinfo->multisample_state.enable_alpha_to_coverage;
// Depth Stencil

2
src/gpu/vulkan/SDL_gpu_vulkan.c
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@@ -6355,7 +6355,7 @@ static SDL_GPUGraphicsPipeline *VULKAN_CreateGraphicsPipeline(
multisampleStateCreateInfo.sampleShadingEnable = VK_FALSE;
multisampleStateCreateInfo.minSampleShading = 1.0f;
multisampleStateCreateInfo.pSampleMask = &sampleMask;
multisampleStateCreateInfo.alphaToCoverageEnable = VK_FALSE;
multisampleStateCreateInfo.alphaToCoverageEnable = createinfo->multisample_state.enable_alpha_to_coverage;
multisampleStateCreateInfo.alphaToOneEnable = VK_FALSE;
// Depth Stencil State