buffer.hpp

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#pragma once
 
#include <cstddef>
#include <initializer_list>
#include <string>
#include <vector>
 
namespace lmgl {
 
namespace renderer {

enum class ShaderDataType { None = 0, Float, Float2, Float3, Float4, Mat3, Mat4, Int, Int2, Int3, Int4, Bool };

struct BufferElement {

    std::string name;

    ShaderDataType type;

    unsigned int size;

    size_t offset;

    bool normalized;

    BufferElement() = default;

    BufferElement(ShaderDataType type, const std::string &name, bool normalized = false);

    unsigned int get_component_count() const;
};

class BufferLayout {
  public:
    BufferLayout() {}

    BufferLayout(const std::initializer_list<BufferElement> &elements);

    inline unsigned int get_stride() const { return m_stride; }

    inline const std::vector<BufferElement> &get_elements() const { return m_elements; }

    std::vector<BufferElement>::iterator begin();

    std::vector<BufferElement>::iterator end();

    std::vector<BufferElement>::const_iterator begin() const;

    std::vector<BufferElement>::const_iterator end() const;
 
  private:
    void calculate_offsets_and_stride();

    std::vector<BufferElement> m_elements;

    unsigned int m_stride = 0;
};

class VertexBuffer {
  public:
    VertexBuffer(const void *vertices, unsigned int size, bool dynamic = false);

    ~VertexBuffer();

    void bind() const;

    void unbind() const;

    void set_data(const void *data, unsigned int size);

    void set_layout(const BufferLayout &layout);

    const BufferLayout &get_layout() const;
 
  private:
    unsigned int m_renderer_id;

    unsigned int m_count;

    BufferLayout m_layout;
};

class IndexBuffer {
  public:
    IndexBuffer(const unsigned int *indices, unsigned int count);

    ~IndexBuffer();

    void bind() const;

    void unbind() const;

    inline unsigned int get_count() const { return m_count; }
 
  private:
    unsigned int m_renderer_id;

    unsigned int m_count;
};
 
} // namespace renderer
 
} // namespace lmgl