Android opengl debug callback, Android device properties, fix texture internal format

engine/util.h

@@ -12,14 +12,7 @@ glm::vec4 rand_color();
 glm::vec3 convert_hsv2rgb(const glm::vec3 c);
 glm::vec3 convert_rgb2hsv(const glm::vec3 c);
 
-//void check_OpenGLError(const char* stmt, const char* fname, int line)
-//{
-//    GLenum err;
-//    while ((err = glGetError()) != GL_NO_ERROR)
-//    {
-//        //LOG("OpenGL error %08x (%s), at %s:%i - for %s", err, gluErrorString(err), fname, line, stmt);
-//    }
-//}
+void check_OpenGLError(const char* stmt, const char* fname, int line);
 
 template<typename T, int N> struct cbuffer
 {