/* * (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/glut.h> #include "readtex.h" #define IMAGE_FILE "../images/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; PFNGLWINDOWPOS2IPROC win_pos_2i = NULL; static void Display( void ) { GLint err; glClearColor(0.2, 0.2, 0.8, 0); glClear( GL_COLOR_BUFFER_BIT ); /* This is the "reference" square. */ (*win_pos_2i)( 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 ); (*win_pos_2i)( 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 ); (*win_pos_2i)( 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 ) { const char * const ver_string = (const char * const) glGetString( GL_VERSION ); const float ver = strtof( ver_string, NULL ); printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); printf("GL_VERSION = %s\n", ver_string); if ( !glutExtensionSupported("GL_MESA_pack_invert") ) { printf("\nSorry, this program requires GL_MESA_pack_invert.\n"); exit(1); } if ( ver >= 1.4 ) { win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2i" ); } else if ( glutExtensionSupported("GL_ARB_window_pos") ) { win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iARB" ); } else if ( glutExtensionSupported("GL_MESA_window_pos") ) { win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iMESA" ); } /* 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. */ if ( win_pos_2i == NULL ) { printf("\nSorry, this program requires either GL 1.4 (or higher),\n" "GL_ARB_window_pos, or GL_MESA_window_pos.\n"); exit(1); } printf("\nThe left 2 squares should be the same color, and the right\n" "square should look upside-down.\n"); image = LoadRGBImage( IMAGE_FILE, & img_width, & 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" ); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutDisplayFunc( Display ); Init(); glutMainLoop(); return 0; }