From 66fa33e5767ff4fb1f6e689cebe8963083bf29ad Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 3 Dec 2002 03:13:17 +0000
Subject: updated to use ARB extensions

---
 progs/demos/winpos.c | 40 ++++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 16 deletions(-)

(limited to 'progs/demos/winpos.c')

diff --git a/progs/demos/winpos.c b/progs/demos/winpos.c
index 2dfa9af600..f6415263d4 100644
--- a/progs/demos/winpos.c
+++ b/progs/demos/winpos.c
@@ -1,4 +1,4 @@
-/* $Id: winpos.c,v 1.5 2002/04/22 16:03:37 brianp Exp $ */
+/* $Id: winpos.c,v 1.6 2002/12/03 03:13:17 brianp Exp $ */
 
 /*
  * Example of how to use the GL_MESA_window_pos extension.
@@ -12,7 +12,7 @@
 #ifdef _WIN32
 #include <windows.h>
 #endif
-#define GL_GLEXT_LEGACY
+#define GL_GLEXT_PROTOTYPES
 #include "GL/glut.h"
 
 #include "readtex.c"  /* a hack, I know */
@@ -30,18 +30,12 @@ static GLubyte *Image;
 static int ImgWidth, ImgHeight;
 static GLenum ImgFormat;
 
+static void (*WindowPosFunc)(GLfloat x, GLfloat y);
 
 
 static void draw( void )
 {
    GLfloat angle;
-   char *extensions;
-
-   extensions = (char *) glGetString( GL_EXTENSIONS );
-   if (strstr( extensions, "GL_MESA_window_pos")==NULL) {
-      printf("Sorry, GL_MESA_window_pos extension not available.\n");
-      return;
-   }
 
    glClear( GL_COLOR_BUFFER_BIT );
 
@@ -50,16 +44,14 @@ static void draw( void )
       GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 );
 
       /* Don't need to worry about the modelview or projection matrices!!! */
-#ifdef GL_MESA_window_pos
-      glWindowPos2fMESA( x, y );
-#endif
+      (*WindowPosFunc)( x, y );
+
       glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image );
    }
+   glFinish();
 }
 
 
-
-
 static void key( unsigned char key, int x, int y )
 {
    (void) x;
@@ -71,7 +63,6 @@ static void key( unsigned char key, int x, int y )
 }
 
 
-
 /* new window size or exposure */
 static void reshape( int width, int height )
 {
@@ -81,6 +72,24 @@ static void reshape( int width, int height )
 
 static void init( void )
 {
+#ifdef GL_ARB_window_pos
+   if (glutExtensionSupported("GL_ARB_window_pos")) {
+      printf("Using GL_ARB_window_pos\n");
+      WindowPosFunc = &glWindowPos2fARB;
+   }
+   else
+#elif defined(GL_ARB_window_pos)
+   if (glutExtensionSupported("GL_MESA_window_pos")) {
+      printf("Using GL_MESA_window_pos\n");
+      WindowPosFunc = &glWindowPos2fMESA;
+   }
+   else
+#endif
+   {
+      printf("Sorry, GL_ARB/MESA_window_pos extension not available.\n");
+      exit(1);
+   }
+
    Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
    if (!Image) {
       printf("Couldn't read %s\n", IMAGE_FILE);
@@ -90,7 +99,6 @@ static void init( void )
 }
 
 
-
 int main( int argc, char *argv[] )
 {
    glutInitWindowPosition(0, 0);
-- 
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