--- /dev/null
+/*
+ * (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 )
+{
+ 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 );
+ 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 );
+ 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;
+}
projects / mesa.git / commitdiff