1 files changed, 147 insertions, 8 deletions
diff --git a/source/Mesh.hpp b/source/Mesh.hpp
index d383087..a208eda 100644
--- a/source/Mesh.hpp
+++ b/source/Mesh.hpp
@@ -1,17 +1,156 @@
 #pragma once
 
-#include "PodVector.hpp"
 #include "RcPtr.hpp"
+#include "SmallVector.hpp"
 
+#include <glad/glad.h>
+#include <cstddef>
 #include <cstdint>
+#include <vector>
 
-struct MeshVertex {
-	float x, y, z;
-	float u, v;
-	uint8_t r, g, b, a;
+namespace Tags {
+/// Vertex element semantics, used to identify the meaning of vertex buffer contents
+enum VertexElementSemantic {
+	/// Position, typically VET_Float3
+	VES_Position = 1,
+	/// Blending weights
+	VES_BlendWeights = 2,
+	/// Blending indices
+	VES_BlendIndices = 3,
+	/// Normal, typically VET_Float3
+	VES_Normal = 4,
+	/// Colour, typically VET_Ubyte4
+	VES_Colour = 5,
+	/// Secondary colour. Generally free for custom data. Means specular with OpenGL FFP.
+	VES_Colour2 = 6,
+	/// Texture coordinates, typically VET_Float2
+	VES_Texture_coordinates = 7,
+	/// Binormal (Y axis if normal is Z)
+	VES_Binormal = 8,
+	/// Tangent (X axis if normal is Z)
+	VES_Tangent = 9,
+	/// The number of VertexElementSemantic elements (note - the first value VES_Position is 1)
+	VES_COUNT = 9,
 };
 
-class Mesh : public RefCounted {
-private:
-	PodVector<MeshVertex> mVertex;
+enum VertexElementType {
+	VET_Float1,
+	VET_Float2,
+	VET_Float3,
+	VET_Float4,
+
+	VET_Short2,
+	VET_Short4,
+	VET_Ubyte4,
+
+	// the following are not universally supported on all hardware:
+	VET_Double1,
+	VET_Double2,
+	VET_Double3,
+	VET_Double4,
+	VET_Ushort2,
+	VET_Ushort4,
+	VET_Int1,
+	VET_Int2,
+	VET_Int3,
+	VET_Int4,
+	VET_Uint1,
+	VET_Uint2,
+	VET_Uint3,
+	VET_Uint4,
+	VET_Byte4, /// signed bytes
+
+	VET_NORM_BEGIN,
+	VET_Byte4Norm = VET_NORM_BEGIN, /// signed bytes (normalized to -1..1)
+	VET_Ubyte4Norm, /// unsigned bytes (normalized to 0..1)
+	VET_Short2Norm, /// signed shorts (normalized to -1..1)
+	VET_Short4Norm,
+	VET_Ushort2Norm, /// unsigned shorts (normalized to 0..1)
+	VET_Ushort4Norm,
+	VET_NORM_END = VET_Ushort4Norm,
+};
+
+int SizeOf(VertexElementType type);
+bool IsNormalized(VertexElementType type);
+
+enum IndexType {
+	IT_16Bit,
+	IT_32Bit,
+};
+
+int SizeOf(IndexType type);
+} // namespace Tags
+
+struct GpuVertexBuffer : public RefCounted {
+	GLuint handle;
+	int sizeInBytes;
+
+	GpuVertexBuffer();
+	~GpuVertexBuffer();
+
+	void Upload(const std::byte* data, size_t sizeInBytes);
+};
+
+struct GpuIndexBuffer : public RefCounted {
+	GLuint handle;
+	Tags::IndexType indexType;
+	int sizeInBytes;
+
+	GpuIndexBuffer();
+	~GpuIndexBuffer();
+
+	void Upload(const std::byte* data, size_t count);
+	void Upload(const std::byte* data, Tags::IndexType type, size_t count);
+};
+
+struct BufferBindings : public RefCounted {
+	SmallVector<RcPtr<GpuVertexBuffer>, 4> bindings;
+
+	int GetMaxBindingIndex() const;
+
+	/// Safe. Returns nullptr if the index is not bound to any buffers.
+	GpuVertexBuffer* GetBinding(int index) const;
+	/// Adds or updates a buffer binding. Setting a binding to nullptr effectively removes the binding.
+	void SetBinding(int index, GpuVertexBuffer* buffer);
+	void Clear();
+};
+
+struct VertexElementFormat {
+	int offset;
+	int bindingIndex;
+	Tags::VertexElementType type;
+	Tags::VertexElementSemantic semantic;
+
+	int GetStride() const;
+
+	auto operator<=>(const VertexElementFormat&) const = default;
+};
+
+struct VertexFormat : public RefCounted {
+	std::vector<VertexElementFormat> elements;
+	int vertexSize = 0;
+
+	const std::vector<VertexElementFormat>& GetElements() { return elements; }
+	void AddElement(VertexElementFormat element);
+	void RemoveElement(int index);
+
+	void Sort();
+	void CompactBindingIndex();
+};
+
+class GpuMesh : public RefCounted {
+public:
+	RcPtr<VertexFormat> vertFormat;
+	RcPtr<BufferBindings> vertBufBindings;
+	RcPtr<GpuIndexBuffer> indexBuf;
+
+public:
+	GpuMesh(VertexFormat* vertexFormat, BufferBindings* bindings, GpuIndexBuffer* indexBuffer);
+
+	bool IsEmpty() const;
+	void SetVertex(VertexFormat* vertexFormat, BufferBindings* bindings);
+	VertexFormat* GetVertexFormat() const;
+	BufferBindings* GetVertexBufferBindings() const;
+	void SetIndex(GpuIndexBuffer* buffer);
+	GpuIndexBuffer* GetIndexBuffer() const;
 };