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/*
* (C) Copyright IBM Corporation 2005
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file invert.c
*
* Simple test of GL_MESA_pack_invert functionality. Three squares are
* drawn. The first two should look the same, and the third one should
* look inverted.
*
* \author Ian Romanick <idr@us.ibm.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/glut.h>
#include "readtex.h"
#define IMAGE_FILE DEMOS_DATA_DIR "tree3.rgb"
static int Width = 420;
static int Height = 150;
static const GLfloat Near = 5.0, Far = 25.0;
static GLubyte * image = NULL;
static GLubyte * temp_image = NULL;
static GLuint img_width = 0;
static GLuint img_height = 0;
static GLuint img_format = 0;
static void Display( void )
{
GLint err;
glClearColor(0.2, 0.2, 0.8, 0);
glClear( GL_COLOR_BUFFER_BIT );
/* This is the "reference" square.
*/
glWindowPos2i( 5, 5 );
glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, image );
glPixelStorei( GL_PACK_INVERT_MESA, GL_FALSE );
err = glGetError();
if ( err != GL_NO_ERROR ) {
printf( "Setting PACK_INVERT_MESA to false generated an error (0x%04x).\n",
err );
}
glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
glWindowPos2i( 5 + 1 * (10 + img_width), 5 );
glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
glPixelStorei( GL_PACK_INVERT_MESA, GL_TRUE );
err = glGetError();
if ( err != GL_NO_ERROR ) {
printf( "Setting PACK_INVERT_MESA to true generated an error (0x%04x).\n",
err );
}
glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
glWindowPos2i( 5 + 2 * (10 + img_width), 5 );
glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
glutSwapBuffers();
}
static void Reshape( int width, int height )
{
GLfloat ar = (float) width / (float) height;
Width = width;
Height = height;
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
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 Init( void )
{
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
if ( !glutExtensionSupported("GL_MESA_pack_invert") ) {
printf("\nSorry, this program requires GL_MESA_pack_invert.\n");
exit(1);
}
if ( !glutExtensionSupported("GL_ARB_window_pos") ) {
printf("\nSorry, this program requires GL_ARB_window_pos.\n");
exit(1);
}
/* Do this check as a separate if-statement instead of as an else in case
* one of the required extensions is supported but glutGetProcAddress
* returns NULL.
*/
printf("\nThe left 2 squares should be the same color, and the right\n"
"square should look upside-down.\n");
image = LoadRGBImage( IMAGE_FILE, (GLint *) & img_width, (GLint *) & img_height,
& img_format );
if ( image == NULL ) {
printf( "Could not open image file \"%s\".\n", IMAGE_FILE );
exit(1);
}
temp_image = malloc( 3 * img_height * img_width );
if ( temp_image == NULL ) {
printf( "Could not allocate memory for temporary image.\n" );
exit(1);
}
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( Width, Height );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
glutCreateWindow( "GL_MESA_pack_invert test" );
glewInit();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
return 0;
}
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