VertexBufferLayout.h

#pragma once
#include <vector>
#include <GL/glew.h>
#include "Common.h"
#include <assert.h>

struct VertexBufferElement {
	unsigned int type;
	unsigned int count;
	unsigned char normalized;

	static unsigned int GetSizeOfType(unsigned int type ) {
		switch (type) {
		case GL_FLOAT: return 4;
		case GL_UNSIGNED_INT: return 4;
		case GL_UNSIGNED_BYTE: return 1;
		}
		ASSERT(false);
		return 0;
	}
};

class VertexBufferLayout {
private:
	std::vector<VertexBufferElement> m_Elements;
	unsigned int m_Stride;
public:
	VertexBufferLayout() : m_Stride(0) {}

	template<typename T>
	void Push(unsigned int count) {
		//static_assert(false);
		m_Stride = 0;
	}

	template<>
	void Push<float>(unsigned int count) {
		m_Elements.push_back({GL_FLOAT,count, GL_FALSE});
		m_Stride += VertexBufferElement::GetSizeOfType(GL_FLOAT) * count;
	}

	template<>
	void Push<unsigned int>(unsigned int count) {
		m_Elements.push_back({ GL_UNSIGNED_INT,count, GL_FALSE });
		m_Stride += VertexBufferElement::GetSizeOfType(GL_UNSIGNED_INT) * count;
	}

	template<>
	void Push<unsigned char>(unsigned int count) {
		m_Elements.push_back({ GL_UNSIGNED_BYTE,count, GL_TRUE });
		m_Stride += VertexBufferElement::GetSizeOfType(GL_UNSIGNED_BYTE) * count;
	}
	inline const std::vector<VertexBufferElement>& GetElements() const { return m_Elements; };
	inline unsigned int GetStride() const { return m_Stride; }
};