Improve Windows vulkan draw performance by reducing the size of a struct.

src/modules/graphics/metal/Shader.mm

@@ -948,7 +948,7 @@ id<MTLRenderPipelineState> Shader::getCachedRenderPipeline(const RenderPipelineK
 			const auto &attrib = attributes.attribs[i];
 			int metalBufferIndex = firstVertexBufferBinding + attrib.bufferIndex;
 
-			vertdesc.attributes[i].format = getMTLVertexFormat(attrib.format);
+			vertdesc.attributes[i].format = getMTLVertexFormat(attrib.getFormat());
 			vertdesc.attributes[i].offset = attrib.offsetFromVertex;
 			vertdesc.attributes[i].bufferIndex = metalBufferIndex;
 

src/modules/graphics/opengl/OpenGL.cpp

@@ -870,7 +870,7 @@ void OpenGL::setVertexAttributes(const VertexAttributes &attributes, const Buffe
 			int components = 0;
 			GLboolean normalized = GL_FALSE;
 			bool intformat = false;
-			GLenum gltype = getGLVertexDataType(attrib.format, components, normalized, intformat);
+			GLenum gltype = getGLVertexDataType(attrib.getFormat(), components, normalized, intformat);
 
 			const void *offsetpointer = reinterpret_cast<void*>(bufferinfo.offset + attrib.offsetFromVertex);
 

src/modules/graphics/vertex.cpp

@@ -26,6 +26,8 @@ namespace love
 namespace graphics
 {
 
+static_assert(sizeof(VertexAttributeInfo) == 4, "Unexpected sizeof(VertexAttributeInfo)");
+
 static_assert(sizeof(Color32) == 4, "sizeof(Color32) incorrect!");
 static_assert(sizeof(STf_RGBAub) == sizeof(float)*2 + sizeof(Color32), "sizeof(STf_RGBAub) incorrect!");
 static_assert(sizeof(STPf_RGBAub) == sizeof(float)*3 + sizeof(Color32), "sizeof(STPf_RGBAub) incorrect!");
@@ -336,7 +338,7 @@ bool VertexAttributes::operator == (const VertexAttributes &other) const
 		{
 			const auto &a = attribs[i];
 			const auto &b = other.attribs[i];
-			if (a.bufferIndex != b.bufferIndex || a.format != b.format || a.offsetFromVertex != b.offsetFromVertex)
+			if (a.bufferIndex != b.bufferIndex || a.packedFormat != b.packedFormat || a.offsetFromVertex != b.offsetFromVertex)
 				return false;
 
 			if (bufferLayouts[a.bufferIndex].stride != other.bufferLayouts[a.bufferIndex].stride)

src/modules/graphics/vertex.h

@@ -298,9 +298,12 @@ struct BufferBindings
 
 struct VertexAttributeInfo
 {
-	uint8 bufferIndex;
-	DataFormat format : 8;
 	uint16 offsetFromVertex;
+	uint8 packedFormat;
+	uint8 bufferIndex;
+
+	void setFormat(DataFormat format) { packedFormat = (uint8)format; }
+	DataFormat getFormat() const { return (DataFormat)packedFormat; }
 };
 
 struct VertexBufferLayout
@@ -335,7 +338,7 @@ struct VertexAttributes
 		enableBits |= (1u << index);
 
 		attribs[index].bufferIndex = bufferindex;
-		attribs[index].format = format;
+		attribs[index].setFormat(format);
 		attribs[index].offsetFromVertex = offsetfromvertex;
 	}
 

src/modules/graphics/vulkan/Graphics.cpp

@@ -2273,7 +2273,7 @@ void Graphics::createVulkanVertexFormat(
 			attributeDescription.location = i;
 			attributeDescription.binding = bufferBinding;
 			attributeDescription.offset = attrib.offsetFromVertex;
-			attributeDescription.format = Vulkan::getVulkanVertexFormat(attrib.format);
+			attributeDescription.format = Vulkan::getVulkanVertexFormat(attrib.getFormat());
 
 			attributeDescriptions.push_back(attributeDescription);
 		}