frame_buffer.hpp

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#ifndef GLK_FRAME_BUFFER_HPP
#define GLK_FRAME_BUFFER_HPP
 
#include <memory>
#include <GL/gl3w.h>
#include <Eigen/Core>
 
#include <glk/texture.hpp>
 
namespace glk {
 
class FrameBuffer {
public:
  FrameBuffer(const Eigen::Vector2i& size, int num_color_buffers = 1, bool use_depth = true);
 
  ~FrameBuffer();
 
  void bind();
  void unbind() const;
 
  int num_color_buffers() const;
  glk::Texture& add_color_buffer(int layout, GLuint internal_format, GLuint format, GLuint type);
  glk::Texture& add_depth_buffer(GLuint internal_format = GL_DEPTH_COMPONENT32F, GLuint format = GL_DEPTH_COMPONENT, GLuint type = GL_FLOAT);
 
  void bind_ext_depth_buffer(const glk::Texture& depth_texture);
 
  Eigen::Vector2i size() const;
  void set_size(const Eigen::Vector2i& size);
 
  const Texture& color() const;
  const Texture& color(int i) const;
  const Texture& depth() const;
 
  Texture& color();
  Texture& color(int i);
  Texture& depth();
 
private:
  int width;
  int height;
 
  GLint viewport[4];
 
  std::vector<GLenum> color_attachments;
  std::vector<int> color_buffer_layouts;
  std::vector<std::shared_ptr<Texture>> color_buffers;
  std::shared_ptr<Texture> depth_buffer;
 
  GLuint frame_buffer;
};
 
}  // namespace glk
 
#endif