1 files changed, 118 insertions, 0 deletions
diff --git a/progs/demos/winpos.c b/progs/demos/winpos.c
new file mode 100644
index 000000000..2ee1df69f
--- /dev/null
+++ b/progs/demos/winpos.c
@@ -0,0 +1,118 @@
+
+/*
+ * Example of how to use the GL_MESA_window_pos extension.
+ * Brian Paul   This file is in the public domain.
+ */
+
+#include <math.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#ifdef _WIN32
+#include <windows.h>
+#endif
+#define GL_GLEXT_PROTOTYPES
+#include "GL/glut.h"
+
+#include "readtex.h"
+
+#define IMAGE_FILE "../images/girl.rgb"
+
+
+#ifndef M_PI
+#  define M_PI 3.14159265
+#endif
+
+
+
+static GLubyte *Image;
+static int ImgWidth, ImgHeight;
+static GLenum ImgFormat;
+
+typedef void (APIENTRY * PFNWINDOWPOSFUNC)(GLfloat x, GLfloat y);
+static PFNWINDOWPOSFUNC WindowPosFunc;
+
+static void draw( void )
+{
+   GLfloat angle;
+
+   glClear( GL_COLOR_BUFFER_BIT );
+
+   for (angle = -45.0; angle <= 135.0; angle += 10.0) {
+      GLfloat x = 50.0 + 200.0 * cos( angle * M_PI / 180.0 );
+      GLfloat y = 50.0 + 200.0 * sin( angle * M_PI / 180.0 );
+
+      /* Don't need to worry about the modelview or projection matrices!!! */
+      (*WindowPosFunc)( x, y );
+
+      glDrawPixels( ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image );
+   }
+   glFinish();
+}
+
+
+static void key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         exit(0);
+   }
+}
+
+
+/* new window size or exposure */
+static void reshape( int width, int height )
+{
+   glViewport(0, 0, (GLint)width, (GLint)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);
+      exit(0);
+   }
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(500, 500);
+   glutInitDisplayMode( GLUT_RGB );
+
+   if (glutCreateWindow("winpos") <= 0) {
+      exit(0);
+   }
+
+   init();
+
+   glutReshapeFunc( reshape );
+   glutKeyboardFunc( key );
+   glutDisplayFunc( draw );
+   glutMainLoop();
+   return 0;
+}