progs/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/glew.h>
  39 #include <GL/glut.h>
  40
  41 #include "readtex.h"
  42
  43 #define IMAGE_FILE "../images/tree3.rgb"
  44
  45 static int Width = 420;
  46 static int Height = 150;
  47 static const GLfloat Near = 5.0, Far = 25.0;
  48
  49 static GLubyte * image = NULL;
  50 static GLubyte * temp_image = NULL;
  51 static GLuint img_width = 0;
  52 static GLuint img_height = 0;
  53 static GLuint img_format = 0;
  54
  55 PFNGLWINDOWPOS2IPROC win_pos_2i = NULL;
  56
  57
  58 static void Display( void )
  59 {
  60    GLint err;
  61
  62
  63    glClearColor(0.2, 0.2, 0.8, 0);
  64    glClear( GL_COLOR_BUFFER_BIT );
  65
  66
  67    /* This is the "reference" square.
  68     */
  69
  70    (*win_pos_2i)( 5, 5 );
  71    glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, image );
  72
  73    glPixelStorei( GL_PACK_INVERT_MESA, GL_FALSE );
  74    err = glGetError();
  75    if ( err != GL_NO_ERROR ) {
  76       printf( "Setting PACK_INVERT_MESA to false generated an error (0x%04x).\n",
  77               err );
  78    }
  79
  80    glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
  81    (*win_pos_2i)( 5 + 1 * (10 + img_width), 5 );
  82    glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
  83
  84    glPixelStorei( GL_PACK_INVERT_MESA, GL_TRUE );
  85    err = glGetError();
  86    if ( err != GL_NO_ERROR ) {
  87       printf( "Setting PACK_INVERT_MESA to true generated an error (0x%04x).\n",
  88               err );
  89    }
  90
  91    glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
  92    (*win_pos_2i)( 5 + 2 * (10 + img_width), 5 );
  93    glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
  94
  95    glutSwapBuffers();
  96 }
  97
  98
  99 static void Reshape( int width, int height )
 100 {
 101    GLfloat ar = (float) width / (float) height;
 102    Width = width;
 103    Height = height;
 104    glViewport( 0, 0, width, height );
 105    glMatrixMode( GL_PROJECTION );
 106    glLoadIdentity();
 107    glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
 108    glMatrixMode( GL_MODELVIEW );
 109    glLoadIdentity();
 110    glTranslatef( 0.0, 0.0, -15.0 );
 111 }
 112
 113
 114 static void Key( unsigned char key, int x, int y )
 115 {
 116    (void) x;
 117    (void) y;
 118    switch (key) {
 119       case 27:
 120          exit(0);
 121          break;
 122    }
 123    glutPostRedisplay();
 124 }
 125
 126
 127 static void Init( void )
 128 {
 129    const char * const ver_string = (const char * const)
 130        glGetString( GL_VERSION );
 131    const float ver = strtod( ver_string, NULL );
 132
 133
 134    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 135    printf("GL_VERSION = %s\n", ver_string);
 136
 137    if ( !glutExtensionSupported("GL_MESA_pack_invert") ) {
 138       printf("\nSorry, this program requires GL_MESA_pack_invert.\n");
 139       exit(1);
 140    }
 141
 142    if ( ver >= 1.4 ) {
 143       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2i" );
 144    }
 145    else if ( glutExtensionSupported("GL_ARB_window_pos") ) {
 146       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iARB" );
 147    }
 148    else if ( glutExtensionSupported("GL_MESA_window_pos") ) {
 149       win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iMESA" );
 150    }
 151
 152
 153    /* Do this check as a separate if-statement instead of as an else in case
 154     * one of the required extensions is supported but glutGetProcAddress
 155     * returns NULL.
 156     */
 157
 158    if ( win_pos_2i == NULL ) {
 159       printf("\nSorry, this program requires either GL 1.4 (or higher),\n"
 160              "GL_ARB_window_pos, or GL_MESA_window_pos.\n");
 161       exit(1);
 162    }
 163
 164    printf("\nThe left 2 squares should be the same color, and the right\n"
 165           "square should look upside-down.\n");
 166
 167
 168    image = LoadRGBImage( IMAGE_FILE, (GLint *) & img_width, (GLint *) & img_height,
 169                          & img_format );
 170    if ( image == NULL ) {
 171       printf( "Could not open image file \"%s\".\n", IMAGE_FILE );
 172       exit(1);
 173    }
 174
 175    temp_image = malloc( 3 * img_height * img_width );
 176    if ( temp_image == NULL ) {
 177       printf( "Could not allocate memory for temporary image.\n" );
 178       exit(1);
 179    }
 180 }
 181
 182
 183 int main( int argc, char *argv[] )
 184 {
 185    glutInit( &argc, argv );
 186    glutInitWindowPosition( 0, 0 );
 187    glutInitWindowSize( Width, Height );
 188    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 189    glutCreateWindow( "GL_MESA_pack_invert test" );
 190    glewInit();
 191    glutReshapeFunc( Reshape );
 192    glutKeyboardFunc( Key );
 193    glutDisplayFunc( Display );
 194    Init();
 195    glutMainLoop();
 196    return 0;
 197 }