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#pragma once
#include "GraphicsTags.hpp"
#include "RcPtr.hpp"
#include "SmallVector.hpp"
#include <glad/glad.h>
#include <cstddef>
#include <cstdint>
#include <vector>
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;
};
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