/* * (C) Copyright IBM Corporation 2004 * 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 blendsquare.c * * Simple test of GL_NV_blend_square functionality. Four squares are drawn * with different blending modes, but all should be rendered with the same * final color. * * \author Ian Romanick <idr@us.ibm.com> */ #include <stdio.h> #include <stdlib.h> #include <GL/glew.h> #include <GL/glut.h> static int Width = 400; static int Height = 200; static const GLfloat Near = 5.0, Far = 25.0; static void Display( void ) { glClearColor(0.2, 0.2, 0.8, 0); glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); glTranslatef(-4.5, 0, 0); glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); glColor3f( 0.5 * 0.5, 0.5 * 0.5, 0.5 * 0.5 ); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glTranslatef(3.0, 0, 0); glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); glColor3f( 0.5, 0.5, 0.5 ); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glBlendFunc( GL_DST_COLOR, GL_ZERO ); glBegin(GL_QUADS); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glTranslatef(3.0, 0, 0); glBlendFunc( GL_SRC_COLOR, GL_ZERO ); glBegin(GL_QUADS); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glTranslatef(3.0, 0, 0); glBlendFunc( GL_ONE, GL_ZERO ); glBegin(GL_QUADS); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glBlendFunc( GL_ZERO, GL_DST_COLOR ); glBegin(GL_QUADS); glVertex2f(-1, -1); glVertex2f( 1, -1); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glPopMatrix(); 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 double version = strtod( ver_string, NULL ); printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); printf("GL_VERSION = %s\n", ver_string); if ( (version < 1.4) && !glutExtensionSupported("GL_NV_blend_square")) { printf("Sorry, this program requires either OpenGL 1.4 or GL_NV_blend_square\n"); exit(1); } printf("\nAll 4 squares should be the same color. The two on the left are drawn\n" "without NV_blend_square functionality, and the two on the right are drawn\n" "with NV_blend_square functionality. If the two on the left are dark, but\n" "the two on the right are not, then NV_blend_square is broken.\n"); glEnable( GL_BLEND ); glBlendEquation( GL_FUNC_ADD ); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowPosition( 0, 0 ); glutInitWindowSize( Width, Height ); glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); glutCreateWindow( "GL_NV_blend_square test" ); glewInit(); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutDisplayFunc( Display ); Init(); glutMainLoop(); return 0; }