Route framebuffer texture copies through GL backend

src/renderer_gl/opengl_capabilities.cpp

@@ -748,6 +748,36 @@ pp::foundation::Status update_opengl_texture_2d(
     return pp::foundation::Status::success();
 }
 
+pp::foundation::Status copy_opengl_framebuffer_to_texture_2d(
+    OpenGlTexture2DFramebufferCopy copy,
+    OpenGlTexture2DFramebufferCopyDispatch dispatch) noexcept
+{
+    if (dispatch.copy_tex_sub_image_2d == nullptr) {
+        return pp::foundation::Status::invalid_argument(
+            "OpenGL framebuffer-to-texture copy dispatch callback must not be null");
+    }
+
+    if (copy.width < 0 || copy.height < 0) {
+        return pp::foundation::Status::invalid_argument(
+            "OpenGL framebuffer-to-texture copy dimensions are invalid");
+    }
+
+    if (copy.width == 0 || copy.height == 0) {
+        return pp::foundation::Status::success();
+    }
+
+    dispatch.copy_tex_sub_image_2d(
+        texture_2d_target(),
+        copy.level,
+        copy.destination_x,
+        copy.destination_y,
+        copy.source_x,
+        copy.source_y,
+        copy.width,
+        copy.height);
+    return pp::foundation::Status::success();
+}
+
 pp::foundation::Status generate_opengl_texture_2d_mipmaps(
     std::uint32_t texture_id,
     OpenGlTexture2DMipmapDispatch dispatch) noexcept