[#63] Add convenience enum for vertex component type.

As requested by @tfrish in mattermost. That's only the additions in
lines 16..24. The rest of the changes are a clean-up of spaces and tabs.

include/vkcv/VertexLayout.hpp

@@ -6,50 +6,56 @@
 
 namespace vkcv{
 
-	/* With these enums, 0 is reserved to signal uninitialized or invalid data. */
-	enum class PrimitiveType : uint32_t {
-		UNDEFINED = 0,
-		POSITION = 1,
-		NORMAL = 2,
-		TEXCOORD_0 = 3
-	};
-	/* This struct describes one vertex attribute of a vertex buffer. */
-	typedef struct {
-		PrimitiveType type;			// POSITION, NORMAL, ...
-		uint32_t offset;			// offset in bytes
-		uint32_t length;			// length of ... in bytes
-		uint32_t stride;			// stride in bytes
-		uint16_t componentType;		// eg. 5126 for float
-		uint8_t  componentCount;	// eg. 3 for vec3
-	} VertexAttribute;
-
-    enum class VertexFormat{
-        FLOAT,
-        FLOAT2,
-        FLOAT3,
-        FLOAT4,
-        INT,
-        INT2,
-        INT3,
-        INT4
-    };
-
-	uint32_t getFormatSize(VertexFormat format);
-
-    struct VertexInputAttachment{
-        VertexInputAttachment() = delete;
-        VertexInputAttachment(uint32_t location, uint32_t binding, VertexFormat format, uint32_t offset) noexcept;
-
-        uint32_t location;
-        uint32_t binding;
-        VertexFormat format;
-        uint32_t offset;
-    };
-
-    struct VertexLayout{
-        VertexLayout() noexcept;
-        VertexLayout(const std::vector<VertexInputAttachment> &inputs) noexcept;
-        std::unordered_map<uint32_t, VertexInputAttachment> attachmentMap;
-        uint32_t stride;
-    };
-}
+/* With these enums, 0 is reserved to signal uninitialized or invalid data. */
+enum class PrimitiveType : uint32_t {
+	UNDEFINED = 0,
+	POSITION = 1,
+	NORMAL = 2,
+	TEXCOORD_0 = 3
+};
+
+/* These integer values are used the same way in OpenGL, Vulkan and glTF. This
+ * enum is not needed for translation, it's only for the programmers
+ * convenience (easier to read in if/switch statements etc). While this enum
+ * exists in (almost) the same definition in the fx-gltf library, we want to
+ * avoid exposing that dependency, thus it is re-defined here. */
+enum class VertexComponentType : uint16_t {
+	NONE=0, INT8=5120, UINT8=5121, INT16=5122, UINT16=5123,
+	UINT32=5125, FLOAT32=5126
+};
+
+/* This struct describes one vertex attribute of a vertex buffer. */
+typedef struct {
+	PrimitiveType type;		// POSITION, NORMAL, ...
+	uint32_t offset;		// offset in bytes
+	uint32_t length;		// length of ... in bytes
+	uint32_t stride;		// stride in bytes
+	uint16_t componentType;		// eg. 5126 for float
+	uint8_t  componentCount;	// eg. 3 for vec3
+} VertexAttribute;
+
+enum class VertexFormat {
+	FLOAT, FLOAT2, FLOAT3, FLOAT4,
+	INT, INT2, INT3, INT4
+};
+
+uint32_t getFormatSize(VertexFormat format);
+
+struct VertexInputAttachment{
+	VertexInputAttachment() = delete;
+	VertexInputAttachment(uint32_t location, uint32_t binding, VertexFormat format, uint32_t offset) noexcept;
+
+	uint32_t location;
+	uint32_t binding;
+	VertexFormat format;
+	uint32_t offset;
+};
+
+struct VertexLayout{
+	VertexLayout() noexcept;
\ No newline at end of file
+	VertexLayout(const std::vector<VertexInputAttachment> &inputs) noexcept;
+	std::unordered_map<uint32_t, VertexInputAttachment> attachmentMap;
+	uint32_t stride;
+};
+
+}