src/tests/invert.c

   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/glut.h>
  39
  40 #include "readtex.h"
  41
  42 #define IMAGE_FILE "../images/tree3.rgb"
  43
  44 static int Width = 420;
  45 static int Height = 150;
  46 static const GLfloat Near = 5.0, Far = 25.0;
  47
  48 static GLubyte * image = NULL;
  49 static GLubyte * temp_image = NULL;
  50 static GLuint img_width = 0;
  51 static GLuint img_height = 0;
  52 static GLuint img_format = 0;
  53
  54 PFNGLWINDOWPOS2IPROC win_pos_2i = NULL;
  55
  56
  57 static 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    (*win_pos_2i)( 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    (*win_pos_2i)( 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    (*win_pos_2i)( 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
  98 static 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
 113 static 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
 126 static void Init( void )
 127 {
 128    const char * const ver_string = (const char * const)
 129        glGetString( GL_VERSION );
 130    const float ver = strtof( ver_string, NULL );
 131
 132
 133    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 134    printf("GL_VERSION = %s\n", ver_string);
 135
 136    if ( !glutExtensionSupported("GL_MESA_pack_invert") ) {
 137       printf("\nSorry, this program requires GL_MESA_pack_invert.\n");
 138       exit(1);
 139    }
 140
 141    if ( ver >= 1.4 ) {
 142       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2i" );
 143    }
 144    else if ( glutExtensionSupported("GL_ARB_window_pos") ) {
 145       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iARB" );
 146    }
 147    else if ( glutExtensionSupported("GL_MESA_window_pos") ) {
 148       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iMESA" );
 149    }
 150
 151
 152    /* Do this check as a separate if-statement instead of as an else in case
 153     * one of the required extensions is supported but glutGetProcAddress
 154     * returns NULL.
 155     */
 156
 157    if ( win_pos_2i == NULL ) {
 158       printf("\nSorry, this program requires either GL 1.4 (or higher),\n"
 159              "GL_ARB_window_pos, or GL_MESA_window_pos.\n");
 160       exit(1);
 161    }
 162
 163    printf("\nThe left 2 squares should be the same color, and the right\n"
 164           "square should look upside-down.\n");
 165
 166
 167    image = LoadRGBImage( IMAGE_FILE, & img_width, & img_height,
 168                          & img_format );
 169    if ( image == NULL ) {
 170       printf( "Could not open image file \"%s\".\n", IMAGE_FILE );
 171       exit(1);
 172    }
 173
 174    temp_image = malloc( 3 * img_height * img_width );
 175    if ( temp_image == NULL ) {
 176       printf( "Could not allocate memory for temporary image.\n" );
 177       exit(1);
 178    }
 179 }
 180
 181
 182 int main( int argc, char *argv[] )
 183 {
 184    glutInit( &argc, argv );
 185    glutInitWindowPosition( 0, 0 );
 186    glutInitWindowSize( Width, Height );
 187    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 188    glutCreateWindow( "GL_MESA_pack_invert test" );
 189    glutReshapeFunc( Reshape );
 190    glutKeyboardFunc( Key );
 191    glutDisplayFunc( Display );
 192    Init();
 193    glutMainLoop();
 194    return 0;
 195 }