+_mesa_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb);
+
+extern GLboolean
+_mesa_has_depthstencil_combined(const struct gl_framebuffer *fb);
+
+extern void
+_mesa_test_framebuffer_completeness(struct gl_context *ctx,
+ struct gl_framebuffer *fb);
+
+extern GLboolean
+_mesa_is_legal_color_format(const struct gl_context *ctx, GLenum baseFormat);