From fe22b8c07d5bae3d8720ab70e29067db762c8443 Mon Sep 17 00:00:00 2001
From: Doug Binks <doug@enkisoftware.com>
Date: Tue, 18 Feb 2014 18:17:09 +0100
Subject: [PATCH] Support for cases where the gl header does not include
 GL_ARB_TIMER_QUERY

---
 example/example_gl3.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/example/example_gl3.c b/example/example_gl3.c
index b0b4b73..129eb00 100644
--- a/example/example_gl3.c
+++ b/example/example_gl3.c
@@ -31,6 +31,14 @@
 #include "nanovg_gl3buf.h"
 #include "demo.h"
 
+
+// timer query support
+#ifndef GL_ARB_timer_query
+#define GL_TIME_ELAPSED                   0x88BF
+typedef void (APIENTRY *pfnGLGETQUERYOBJECTUI64V)(GLuint id, GLenum pname, GLuint64* params);
+pfnGLGETQUERYOBJECTUI64V glGetQueryObjectui64v = 0;
+#endif
+
 void errorcb(int error, const char* desc)
 {
 	printf("GLFW error %d: %s\n", error, desc);
@@ -117,6 +125,13 @@ int main()
 
 	timerquery = glfwExtensionSupported("GL_ARB_timer_query");
 	if( timerquery ) {
+#ifndef GL_ARB_timer_query
+		glGetQueryObjectui64v = (pfnGLGETQUERYOBJECTUI64V)glfwGetProcAddress("glGetQueryObjectui64v");
+		if( !glGetQueryObjectui64v )
+		{
+			timerquery = GL_FALSE;
+		}
+#endif
 		glGenQueries(NUM_QUERIES, timerqueryid);
 	}