From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001
From: jtg <jtg>
Date: Thu, 19 Aug 1999 00:55:39 +0000
Subject: Initial revision

---
 progs/demos/paltex.c | 186 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 progs/demos/paltex.c

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

diff --git a/progs/demos/paltex.c b/progs/demos/paltex.c
new file mode 100644
index 0000000000..e33a8ee075
--- /dev/null
+++ b/progs/demos/paltex.c
@@ -0,0 +1,186 @@
+/* $Id: paltex.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
+
+/*
+ * Paletted texture demo.  Written by Brian Paul.  This file in public domain.
+ */
+
+/*
+ * $Log: paltex.c,v $
+ * Revision 1.1  1999/08/19 00:55:40  jtg
+ * Initial revision
+ *
+ * Revision 3.1  1999/03/28 18:20:49  brianp
+ * minor clean-up
+ *
+ * Revision 3.0  1998/02/14 18:42:29  brianp
+ * initial rev
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static float Rot = 0.0;
+
+
+static void Idle( void )
+{
+   Rot += 5.0;
+   glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT );
+
+   glPushMatrix();
+   glRotatef(Rot, 0, 0, 1);
+
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 1);  glVertex2f(-1, -1);
+   glTexCoord2f(1, 1);  glVertex2f( 1, -1);
+   glTexCoord2f(1, 0);  glVertex2f( 1,  1);
+   glTexCoord2f(0, 0);  glVertex2f(-1,  1);
+   glEnd();
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void SpecialKey( int key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         break;
+      case GLUT_KEY_DOWN:
+         break;
+      case GLUT_KEY_LEFT:
+         break;
+      case GLUT_KEY_RIGHT:
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+   GLubyte texture[8][8] = {  /* PT = Paletted Texture! */
+      {  0,   0,   0,   0,   0,   0,   0,   0},
+      {  0, 100, 100, 100,   0, 180, 180, 180},
+      {  0, 100,   0, 100,   0,   0, 180,   0},
+      {  0, 100,   0, 100,   0,   0, 180,   0},
+      {  0, 100, 100, 100,   0,   0, 180,   0},
+      {  0, 100,   0,   0,   0,   0, 180,   0},
+      {  0, 100,   0,   0,   0,   0, 180,   0},
+      {  0, 100, 255,   0,   0,   0, 180, 250},
+   };
+
+   GLubyte table[256][4];
+   int i;
+
+   if (!glutExtensionSupported("GL_EXT_paletted_texture")) {
+      printf("Sorry, GL_EXT_paletted_texture not supported\n");
+      exit(0);
+   }
+
+   /* put some wacky colors into the texture palette */
+   for (i=0;i<256;i++) {
+      table[i][0] = i;
+      table[i][1] = 0;
+      table[i][2] = 127 + i / 2;
+      table[i][3] = 255;
+   }
+
+#ifdef GL_EXT_paletted_texture
+
+#if defined(GL_EXT_shared_texture_palette) && defined(SHARED_PALETTE)
+   printf("Using shared palette\n");
+   glColorTableEXT(GL_SHARED_TEXTURE_PALETTE_EXT,    /* target */
+                   GL_RGBA,          /* internal format */
+                   256,              /* table size */
+                   GL_RGBA,          /* table format */
+                   GL_UNSIGNED_BYTE, /* table type */
+                   table);           /* the color table */
+   glEnable(GL_SHARED_TEXTURE_PALETTE_EXT);
+#else
+   glColorTableEXT(GL_TEXTURE_2D,    /* target */
+                   GL_RGBA,          /* internal format */
+                   256,              /* table size */
+                   GL_RGBA,          /* table format */
+                   GL_UNSIGNED_BYTE, /* table type */
+                   table);           /* the color table */
+#endif
+
+   glTexImage2D(GL_TEXTURE_2D,       /* target */
+                0,                   /* level */
+                GL_COLOR_INDEX8_EXT, /* internal format */
+                8, 8,                /* width, height */
+                0,                   /* border */
+                GL_COLOR_INDEX,      /* texture format */
+                GL_UNSIGNED_BYTE,    /* texture type */
+                texture);            /* teh texture */
+#endif
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+   glEnable(GL_TEXTURE_2D);
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 400, 400 );
+
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+
+   glutCreateWindow(argv[0]);
+
+   Init();
+
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutSpecialFunc( SpecialKey );
+   glutDisplayFunc( Display );
+   glutIdleFunc( Idle );
+
+   glutMainLoop();
+   return 0;
+}
-- 
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