igl | opengl | Add workround for OpenGL + Tracy

Summary:
Tracy requires an implementation for glQueryCounterEXT, which isn't available on Android with the default configuration.

This workaround provides the implementation for the function to silence a linking error when compiling IGL OpenGL.

Reviewed By: corporateshark, rameshviswanathan

Differential Revision: D63145793

fbshipit-source-id: cf066cfb2acab8e4f81c380ba10d7655ebfd7696

src/igl/opengl/GLFunc.cpp

@@ -20,6 +20,15 @@
 #define IGL_GET_PROC_ADDRESS(funcName) nullptr
 #endif // IGL_EGL
 
+// When using OpenGL, Tracy needs glQueryCounterEXT to be defined, but it's not available in all
+// platforms or OpenGL versions. The following is a workaround to make Tracy work in all platforms.
+// Note: OpenGL has not been tested with Tracy yet, and that's why the workaround works with OpenGL
+#if defined(IGL_WITH_TRACY)
+#if !defined GL_TIMESTAMP && defined GL_TIMESTAMP_EXT
+extern "C" void glQueryCounterEXT(GLuint, GLenum) {}
+#endif
+#endif
+
 #define GLEXTENSION_DIRECT_CALL(funcName, funcType, ...) funcName(__VA_ARGS__);
 #define GLEXTENSION_DIRECT_CALL_WITH_RETURN(funcName, funcType, returnOnError, ...) \
   return funcName(__VA_ARGS__);