[nostalgia/glutils] Add FrameBuffer type

src/nostalgia/glutils/glutils.hpp

@@ -6,11 +6,15 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+#pragma once
+
 #include <ox/std/defines.hpp>
 
 #define GL_GLEXT_PROTOTYPES 1
 #ifdef OX_OS_Darwin
+#ifndef GL_SILENCE_DEPRECATION
 #define GL_SILENCE_DEPRECATION
+#endif
 #include <OpenGL/gl3.h>
 #else
 #include <GLES3/gl3.h>
@@ -63,7 +67,7 @@ struct GLObject: public Base {
 		o.id = 0;
 	}
 
-	~GLObject() {
+	~GLObject() noexcept {
 		del(id);
 	}
 
@@ -94,22 +98,51 @@ struct GLObject: public Base {
 };
 
 void deleteBuffer(GLuint b) noexcept;
+void deleteFrameBuffer(GLuint b) noexcept;
+void deleteRenderBuffer(GLuint b) noexcept;
 void deleteTexture(GLuint t) noexcept;
 void deleteVertexArray(GLuint v) noexcept;
 
 extern template struct GLObject<deleteBuffer>;
+extern template struct GLObject<deleteFrameBuffer>;
+extern template struct GLObject<deleteRenderBuffer>;
 extern template struct GLObject<deleteTexture, TextureBase>;
 extern template struct GLObject<deleteVertexArray>;
 extern template struct GLObject<glDeleteProgram>;
 extern template struct GLObject<glDeleteShader>;
 
 using GLBuffer = GLObject<deleteBuffer>;
+using GLFrameBuffer = GLObject<deleteBuffer>;
+using GLRenderBuffer = GLObject<deleteRenderBuffer>;
 using GLShader = GLObject<glDeleteShader>;
 using GLProgram = GLObject<glDeleteProgram>;
 using GLTexture = GLObject<deleteTexture, TextureBase>;
 using GLVertexArray = GLObject<deleteVertexArray>;
 
+/**
+ * FrameBuffer holds everything needed for a usable frame buffer to exist.
+ * It differs from GLFrameBuffer in that GLFrameBuffer only manages the FBO
+ * and not its dependencies.
+ */
+struct FrameBuffer {
+	GLFrameBuffer fbo;
+	GLTexture color;
+	GLRenderBuffer depth;
+
+	constexpr operator GLuint&() noexcept {
+		return fbo.id;
+	}
+
+	constexpr operator const GLuint&() const noexcept {
+		return fbo.id;
+	}
+};
+
+
 [[nodiscard]]
 ox::Result<GLProgram> buildShaderProgram(const GLchar *vert, const GLchar *frag) noexcept;
 
-}
+[[nodiscard]]
+FrameBuffer generateFrameBuffer(int width, int height) noexcept;
+
+}