Merge pull request #1399 from billhollings/e5b9g9r9-disable-blending
Disable blending for VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 on macOS Apple Silicon.
diff --git a/Docs/Whats_New.md b/Docs/Whats_New.md
index 6a1c749..ed29646 100644
--- a/Docs/Whats_New.md
+++ b/Docs/Whats_New.md
@@ -20,6 +20,8 @@
- Fix incorrect translation of clear color values on Apple Silicon.
- Fix swizzle of depth and stencil values into RGBA (`float4`) variable in shaders.
+- Disable `VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BLEND_BIT` for
+ `VK_FORMAT_E5B9G9R9_UFLOAT_PACK32` on macOS Apple Silicon.
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
index c40a156..fb305ba 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
@@ -1546,7 +1546,10 @@
addGPUOSMTLPixFmtCaps( Apple5, 10.16, RGBA8Unorm_sRGB, All );
addGPUOSMTLPixFmtCaps( Apple5, 10.16, BGRA8Unorm_sRGB, All );
+ // Blending is actually supported for this format, but format channels cannot be individually write-enabled during blending.
+ // Disabling blending is the least-intrusive way to handle this in a Vulkan-friendly way.
addGPUOSMTLPixFmtCaps( Apple5, 10.16, RGB9E5Float, All );
+ disableMTLPixFmtCaps ( RGB9E5Float, Blend);
addGPUOSMTLPixFmtCaps( Apple5, 10.16, PVRTC_RGBA_2BPP, RF );
addGPUOSMTLPixFmtCaps( Apple5, 10.16, PVRTC_RGBA_2BPP_sRGB, RF );
