Allow more WebGL2 FBO attachment formats

Add support for most of the framebuffer attachment formats
introduced in WebGL2 for textures and renderbuffers.

Related format tables:

- https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glTexImage2D.xhtml
- https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glRenderbufferStorage.xhtml

components/script/dom/webglrenderbuffer.rs

@@ -145,6 +145,31 @@ impl WebGLRenderbuffer {
             constants::RGBA4 | constants::DEPTH_COMPONENT16 | constants::STENCIL_INDEX8 => {
                 internal_format
             },
+            constants::R8 |
+            constants::R8UI |
+            constants::R8I |
+            constants::R16UI |
+            constants::R16I |
+            constants::R32UI |
+            constants::R32I |
+            constants::RG8 |
+            constants::RG8UI |
+            constants::RG8I |
+            constants::RG16UI |
+            constants::RG16I |
+            constants::RG32UI |
+            constants::RG32I |
+            constants::RGB8 |
+            constants::RGBA8 |
+            constants::SRGB8_ALPHA8 |
+            constants::RGB10_A2 |
+            constants::RGBA8UI |
+            constants::RGBA8I |
+            constants::RGB10_A2UI |
+            constants::RGBA16UI |
+            constants::RGBA16I |
+            constants::RGBA32I |
+            constants::RGBA32UI |
             constants::DEPTH_COMPONENT24 |
             constants::DEPTH_COMPONENT32F |
             constants::DEPTH24_STENCIL8 |