#pragma once
#include "hd2d/GL.h"

#include <initializer_list>
#include <vector>

namespace hd2d {

// Creates an immutable 2D texture with clamp-to-edge sampling.
GLuint createTexture2D(GLenum internalFormat, int w, int h, GLenum filter = GL_LINEAR, int levels = 1);

// Framebuffer owning its color attachments. Depth can be owned (depthFormat)
// or borrowed from another target (sharedDepth) so passes can depth-test
// against an earlier pass without copying.
class RenderTarget {
public:
    RenderTarget() = default;
    RenderTarget(const RenderTarget&) = delete;
    RenderTarget& operator=(const RenderTarget&) = delete;
    ~RenderTarget() { destroy(); }

    void create(int w, int h, std::initializer_list<GLenum> colorFormats, GLenum depthFormat = 0,
                GLuint sharedDepth = 0, GLenum filter = GL_LINEAR);
    void destroy();
    void bind() const;  // binds FBO and sets viewport

    GLuint fbo() const { return fbo_; }
    GLuint color(int i = 0) const { return colors_[i]; }
    GLuint depth() const { return depth_; }
    int width() const { return w_; }
    int height() const { return h_; }

private:
    GLuint fbo_ = 0, depth_ = 0;
    bool ownsDepth_ = false;
    std::vector<GLuint> colors_;
    int w_ = 0, h_ = 0;
};

}  // namespace hd2d