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#pragma once
#include <cstdint>
#include <vector>
namespace Donut
{
struct VertexBufferElement
{
uint32_t type;
uint32_t count;
uint8_t normalized;
uint32_t offset;
static auto get_size_of_type(uint32_t type) -> uint32_t;
};
class VertexBufferLayout
{
public:
VertexBufferLayout() = default;
~VertexBufferLayout() = default;
template<typename T>
auto push(uint32_t count) -> void
{
static_assert(false);
}
template<>
void push<float>(uint32_t count)
{
m_elements.push_back({ 0x1406, count, 0, m_stride }); // GL_FLOAT
m_stride += count * VertexBufferElement::get_size_of_type(0x1406);
}
template<>
void push<uint32_t>(uint32_t count)
{
m_elements.push_back({ 0x1405, count, 0, m_stride }); // GL_UNSIGNED_INT
m_stride += count * VertexBufferElement::get_size_of_type(0x1405);
}
template<>
void push<uint8_t>(uint32_t count)
{
m_elements.push_back({ 0x1401, count, 1, m_stride }); // GL_UNSIGNED_BYTE
m_stride += count * VertexBufferElement::get_size_of_type(0x1401);
}
inline auto get_elements() const -> const std::vector<VertexBufferElement>& { return m_elements; }
inline auto get_stride() const -> uint32_t { return m_stride; }
private:
std::vector<VertexBufferElement> m_elements;
uint32_t m_stride = 0;
};
class VertexBuffer
{
public:
virtual ~VertexBuffer() = default;
virtual auto bind() const -> void = 0;
virtual auto unbind() const -> void = 0;
virtual auto set_data(const void* data, uint32_t size) -> void = 0;
virtual auto get_layout() const -> const VertexBufferLayout& = 0;
virtual auto set_layout(const VertexBufferLayout& layout) -> void = 0;
static auto create(const void* data, uint32_t size) -> VertexBuffer*;
};
};
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