init

engine/include/hd2d/RenderTarget.h

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+#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