+++ /dev/null
-/*
- * (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 blendminmax.c
- *
- * Simple test of GL_EXT_blend_minmax 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();
-
- /* This is the "reference" square.
- */
-
- glTranslatef(-4.5, 0, 0);
- glBlendEquation( GL_FUNC_ADD );
- 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();
-
-
- /* GL_MIN and GL_MAX are supposed to ignore the blend function setting.
- * To test that, we set the blend function to GL_ZERO for both color and
- * alpha each time GL_MIN or GL_MAX is used.
- *
- * Apple ships an extension called GL_ATI_blend_weighted_minmax (supported
- * on Mac OS X 10.2 and later). I believe the difference with that
- * extension is that it uses the blend function. However, I have no idea
- * what the enums are for it. The extension is listed at Apple's developer
- * site, but there is no documentation.
- *
- * http://developer.apple.com/opengl/extensions.html
- */
-
- glTranslatef(3.0, 0, 0);
- glBlendEquation( GL_FUNC_ADD );
- 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();
-
- glBlendEquation( GL_MAX );
- glBlendFunc( GL_ZERO, GL_ZERO );
- glBegin(GL_QUADS);
- glColor3f( 0.2, 0.2, 0.2 );
- glVertex2f(-1, -1);
- glVertex2f( 1, -1);
- glVertex2f( 1, 1);
- glVertex2f(-1, 1);
- glEnd();
-
-
- glTranslatef(3.0, 0, 0);
- glBlendEquation( GL_FUNC_ADD );
- 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();
-
- glBlendEquation( GL_MIN );
- glBlendFunc( GL_ZERO, GL_ZERO );
- glBegin(GL_QUADS);
- glColor3f( 0.8, 0.8, 0.8 );
- glVertex2f(-1, -1);
- glVertex2f( 1, -1);
- glVertex2f( 1, 1);
- glVertex2f(-1, 1);
- glEnd();
-
-
- glTranslatef(3.0, 0, 0);
- glBlendEquation( GL_FUNC_ADD );
- glBlendFunc( GL_ONE, GL_ZERO );
- glBegin(GL_QUADS);
- glColor3f( 0.8, 0.8, 0.8 );
- glVertex2f(-1, -1);
- glVertex2f( 1, -1);
- glVertex2f( 1, 1);
- glVertex2f(-1, 1);
- glEnd();
-
- glBlendEquation( GL_MIN );
- glBlendFunc( GL_ZERO, 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();
-
- 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 *)
- glGetString( GL_VERSION );
-
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
- printf("GL_VERSION = %s\n", ver_string);
-
- if ( !glutExtensionSupported("GL_ARB_imaging") && !glutExtensionSupported("GL_EXT_blend_minmax")) {
- printf("Sorry, this program requires either GL_ARB_imaging or GL_EXT_blend_minmax.\n");
- exit(1);
- }
-
- printf("\nAll 4 squares should be the same color.\n");
- glEnable( GL_BLEND );
-}
-
-
-int main( int argc, char *argv[] )
-{
- glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( Width, Height );
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
- glutCreateWindow( "GL_EXT_blend_minmax test" );
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff