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Restore support for BC1_RGB compressed format.

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For Vulkan BC1_RGB formats, swizzle alpha of substituted
Metal BC1_RGBA to 1.0, to return value expected by Vulkan.
This commit is contained in:
Bill Hollings 2021-11-09 12:13:51 -05:00
parent 0516bb84e9
commit 6e054ad5db
3 changed files with 15 additions and 4 deletions
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2
Docs/Whats_New.md
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@ -24,8 +24,6 @@ Released TBD
is not supported on platform, but app doesn't actually attempt to render to multiple layers.
- Fix dynamic pipeline state such as `vkCmdSetDepthBias()` sometimes ignoring pipeline dyamic
state flags when called before `vkCmdBindPipeline()`.
- Remove advertising support for pixel formats `VK_FORMAT_BC1_RGB_UNORM_BLOCK` and `VK_FORMAT_BC1_RGB_SRGB_BLOCK`,
as these can cause rare compatibility problems with transparency encoding.
- Update to latest SPIRV-Cross version:
- MSL: Add support for `OpSpecConstantOp` ops `OpQuantizeToF16` and `OpSRem`.
- MSL: Return fragment function value even when last SPIR-V Op is discard (`OpKill`).

13
MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
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@ -1489,6 +1489,19 @@ VkResult MVKImageViewPlane::initSwizzledMTLPixelFormat(const VkImageViewCreateIn
_componentSwizzle = pCreateInfo->components;
VkImageAspectFlags aspectMask = pCreateInfo->subresourceRange.aspectMask;
// Use swizzle adjustment to bridge some differences between Vulkan and Metal pixel formats.
// Do this ahead of other tests and adjustments so that swizzling will be enabled by tests below.
switch (pCreateInfo->format) {
case VK_FORMAT_BC1_RGB_UNORM_BLOCK:
case VK_FORMAT_BC1_RGB_SRGB_BLOCK:
// Metal doesn't support BC1_RGB, so force substituted BC1_RGBA alpha to 1.0.
_componentSwizzle.a = VK_COMPONENT_SWIZZLE_ONE;
break;
default:
break;
}
#define SWIZZLE_MATCHES(R, G, B, A) mvkVkComponentMappingsMatch(_componentSwizzle, {VK_COMPONENT_SWIZZLE_ ##R, VK_COMPONENT_SWIZZLE_ ##G, VK_COMPONENT_SWIZZLE_ ##B, VK_COMPONENT_SWIZZLE_ ##A} )
#define VK_COMPONENT_SWIZZLE_ANY VK_COMPONENT_SWIZZLE_MAX_ENUM

4
MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
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@ -935,8 +935,8 @@ void MVKPixelFormats::initVkFormatCapabilities() {
addVkFormatDesc( X8_D24_UNORM_PACK32, Invalid, Depth24Unorm_Stencil8, Invalid, Invalid, 1, 1, 4, DepthStencil );
addVkFormatDesc( BC1_RGB_UNORM_BLOCK, Invalid, BC1_RGBA, Invalid, Invalid, 4, 4, 8, Compressed );
addVkFormatDesc( BC1_RGB_SRGB_BLOCK, Invalid, BC1_RGBA_sRGB, Invalid, Invalid, 4, 4, 8, Compressed );
addVkFormatDesc( BC1_RGB_UNORM_BLOCK, BC1_RGBA, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
addVkFormatDesc( BC1_RGB_SRGB_BLOCK, BC1_RGBA_sRGB, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
addVkFormatDesc( BC1_RGBA_UNORM_BLOCK, BC1_RGBA, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );
addVkFormatDesc( BC1_RGBA_SRGB_BLOCK, BC1_RGBA_sRGB, Invalid, Invalid, Invalid, 4, 4, 8, Compressed );