Remove atomic usage for RG32Uint.

Author: squidbus

MoltenVK/MoltenVK/GPUObjects/MVKBuffer.mm

@@ -296,7 +296,7 @@
         if ( mvkIsAnyFlagEnabled(_buffer->getUsage(), VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT) ) {
 			usage |= MTLTextureUsageShaderWrite;
 #if MVK_XCODE_15
-			if (getMetalFeatures().nativeTextureAtomics && (_mtlPixelFormat == MTLPixelFormatR32Sint || _mtlPixelFormat == MTLPixelFormatR32Uint || _mtlPixelFormat == MTLPixelFormatRG32Uint))
+			if (getMetalFeatures().nativeTextureAtomics && (_mtlPixelFormat == MTLPixelFormatR32Sint || _mtlPixelFormat == MTLPixelFormatR32Uint))
 				usage |= MTLTextureUsageShaderAtomic;
 #endif
         }

MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm

@@ -748,7 +748,7 @@
 	}
 
 #if MVK_XCODE_15
-	if (supportAtomics && (mtlFormat == MTLPixelFormatR32Uint || mtlFormat == MTLPixelFormatR32Sint || mtlFormat == MTLPixelFormatRG32Uint)) {
+	if (supportAtomics && (mtlFormat == MTLPixelFormatR32Uint || mtlFormat == MTLPixelFormatR32Sint)) {
 		mvkEnableFlags(mtlUsage, MTLTextureUsageShaderAtomic);
 	}
 #endif
@@ -1497,7 +1497,6 @@
 // Modifies the format capability tables based on the capabilities of the specific MTLDevice
 void MVKPixelFormats::modifyMTLFormatCapabilities(const MVKMTLDeviceCapabilities& gpuCaps) {
 
-	bool noVulkanSupport =  false;		// Indicated supported in Metal but not Vulkan or SPIR-V.
 	bool notMac =  gpuCaps.isAppleGPU && !gpuCaps.supportsMac1;
 	bool iosOnly1 = notMac && !gpuCaps.supportsApple2;
 	bool iosOnly2 = notMac && !gpuCaps.supportsApple3;
@@ -1538,12 +1537,6 @@
 	setMTLPixFmtCapsIf( iosOnly6, RG32Uint, RWC );
 	setMTLPixFmtCapsIf( iosOnly6, RG32Sint, RWC );
 
-	// Metal supports reading both R&G into as one 64-bit atomic operation, but Vulkan and SPIR-V do not.
-	// Including this here so we remember to update this if support is added to Vulkan in the future.
-	bool atomic64 = noVulkanSupport && (gpuCaps.supportsApple9 || (gpuCaps.supportsApple8 && gpuCaps.supportsMac2));
-	enableMTLPixFmtCapsIf( atomic64, RG32Uint, Atomic );
-	enableMTLPixFmtCapsIf( atomic64, RG32Sint, Atomic );
-
 	setMTLPixFmtCapsIf( iosOnly8, RG32Float, RWCMB );
 	setMTLPixFmtCapsIf( iosOnly6, RG32Float, RWCB );