1/*
2 * (C) Copyright IBM Corporation 2005
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
19 * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25/**
26 * \file invert.c
27 *
28 * Simple test of GL_MESA_pack_invert functionality.  Three squares are
29 * drawn.  The first two should look the same, and the third one should
30 * look inverted.
31 *
32 * \author Ian Romanick <idr@us.ibm.com>
33 */
34
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <GL/glew.h>
39#include "glut_wrap.h"
40
41#include "readtex.h"
42
43#define IMAGE_FILE DEMOS_DATA_DIR "tree3.rgb"
44
45static int Width = 420;
46static int Height = 150;
47static const GLfloat Near = 5.0, Far = 25.0;
48
49static GLubyte * image = NULL;
50static GLubyte * temp_image = NULL;
51static GLuint img_width = 0;
52static GLuint img_height = 0;
53static GLuint img_format = 0;
54
55
56
57static void Display( void )
58{
59   GLint err;
60
61
62   glClearColor(0.2, 0.2, 0.8, 0);
63   glClear( GL_COLOR_BUFFER_BIT );
64
65
66   /* This is the "reference" square.
67    */
68
69   glWindowPos2i( 5, 5 );
70   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, image );
71
72   glPixelStorei( GL_PACK_INVERT_MESA, GL_FALSE );
73   err = glGetError();
74   if ( err != GL_NO_ERROR ) {
75      printf( "Setting PACK_INVERT_MESA to false generated an error (0x%04x).\n",
76	      err );
77   }
78
79   glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
80   glWindowPos2i( 5 + 1 * (10 + img_width), 5 );
81   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
82
83   glPixelStorei( GL_PACK_INVERT_MESA, GL_TRUE );
84   err = glGetError();
85   if ( err != GL_NO_ERROR ) {
86      printf( "Setting PACK_INVERT_MESA to true generated an error (0x%04x).\n",
87	      err );
88   }
89
90   glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
91   glWindowPos2i( 5 + 2 * (10 + img_width), 5 );
92   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
93
94   glutSwapBuffers();
95}
96
97
98static void Reshape( int width, int height )
99{
100   GLfloat ar = (float) width / (float) height;
101   Width = width;
102   Height = height;
103   glViewport( 0, 0, width, height );
104   glMatrixMode( GL_PROJECTION );
105   glLoadIdentity();
106   glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
107   glMatrixMode( GL_MODELVIEW );
108   glLoadIdentity();
109   glTranslatef( 0.0, 0.0, -15.0 );
110}
111
112
113static void Key( unsigned char key, int x, int y )
114{
115   (void) x;
116   (void) y;
117   switch (key) {
118      case 27:
119         exit(0);
120         break;
121   }
122   glutPostRedisplay();
123}
124
125
126static void Init( void )
127{
128   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
129   printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
130
131   if ( !glutExtensionSupported("GL_MESA_pack_invert") ) {
132      printf("\nSorry, this program requires GL_MESA_pack_invert.\n");
133      exit(1);
134   }
135
136   if ( !glutExtensionSupported("GL_ARB_window_pos") ) {
137      printf("\nSorry, this program requires GL_ARB_window_pos.\n");
138      exit(1);
139   }
140
141   /* Do this check as a separate if-statement instead of as an else in case
142    * one of the required extensions is supported but glutGetProcAddress
143    * returns NULL.
144    */
145
146   printf("\nThe left 2 squares should be the same color, and the right\n"
147	  "square should look upside-down.\n");
148
149
150   image = LoadRGBImage( IMAGE_FILE, (GLint *) & img_width, (GLint *) & img_height,
151			 & img_format );
152   if ( image == NULL ) {
153      printf( "Could not open image file \"%s\".\n", IMAGE_FILE );
154      exit(1);
155   }
156
157   temp_image = malloc( 3 * img_height * img_width );
158   if ( temp_image == NULL ) {
159      printf( "Could not allocate memory for temporary image.\n" );
160      exit(1);
161   }
162}
163
164
165int main( int argc, char *argv[] )
166{
167   glutInit( &argc, argv );
168   glutInitWindowPosition( 0, 0 );
169   glutInitWindowSize( Width, Height );
170   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
171   glutCreateWindow( "GL_MESA_pack_invert test" );
172   glewInit();
173   glutReshapeFunc( Reshape );
174   glutKeyboardFunc( Key );
175   glutDisplayFunc( Display );
176   Init();
177   glutMainLoop();
178   return 0;
179}
180