progs/tests/bug_3101.c

   1 /*
   2  * (C) Copyright IBM Corporation 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file blendminmax.c
  27  *
  28  * Simple test of GL_EXT_blend_minmax functionality.  Four squares are drawn
  29  * with different blending modes, but all should be rendered with the same
  30  * final color.
  31  *
  32  * \author Ian Romanick <idr@us.ibm.com>
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <GL/glut.h>
  38
  39 static int Width = 400;
  40 static int Height = 200;
  41 static const GLfloat Near = 5.0, Far = 25.0;
  42
  43
  44 static void Display( void )
  45 {
  46    glClearColor(0.2, 0.2, 0.8, 0);
  47    glClear( GL_COLOR_BUFFER_BIT );
  48
  49    glPushMatrix();
  50
  51    /* This is the "reference" square.
  52     */
  53
  54    glTranslatef(-4.5, 0, 0);
  55    glBlendEquation( GL_FUNC_ADD );
  56    glBlendFunc( GL_ONE, GL_ZERO );
  57    glBegin(GL_QUADS);
  58    glColor3f( 0.5, 0.5, 0.5 );
  59    glVertex2f(-1, -1);
  60    glVertex2f( 1, -1);
  61    glEdgeFlag(GL_TRUE);
  62    glVertex2f( 1,  1);
  63    glVertex2f(-1,  1);
  64    glEnd();
  65
  66    glutSwapBuffers();
  67 }
  68
  69
  70 static void Reshape( int width, int height )
  71 {
  72    GLfloat ar = (float) width / (float) height;
  73    Width = width;
  74    Height = height;
  75    glViewport( 0, 0, width, height );
  76    glMatrixMode( GL_PROJECTION );
  77    glLoadIdentity();
  78    glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
  79    glMatrixMode( GL_MODELVIEW );
  80    glLoadIdentity();
  81    glTranslatef( 0.0, 0.0, -15.0 );
  82 }
  83
  84
  85 static void Key( unsigned char key, int x, int y )
  86 {
  87    (void) x;
  88    (void) y;
  89    switch (key) {
  90       case 27:
  91          exit(0);
  92          break;
  93    }
  94    glutPostRedisplay();
  95 }
  96
  97
  98 static void Init( void )
  99 {
 100    const char * const ver_string = (const char * const)
 101        glGetString( GL_VERSION );
 102
 103    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 104    printf("GL_VERSION = %s\n", ver_string);
 105
 106    printf("\nThis program should draw a single square, but not crash.\n");
 107    printf("This is a regression test for bug #3101.\n");
 108    printf("https://bugs.freedesktop.org/show_bug.cgi?id=3101\n");
 109    glEnable( GL_BLEND );
 110 }
 111
 112
 113 int main( int argc, char *argv[] )
 114 {
 115    glutInit( &argc, argv );
 116    glutInitWindowPosition( 0, 0 );
 117    glutInitWindowSize( Width, Height );
 118    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 119    glutCreateWindow( "Bug #3101 Test" );
 120    glutReshapeFunc( Reshape );
 121    glutKeyboardFunc( Key );
 122    glutDisplayFunc( Display );
 123    Init();
 124    glutMainLoop();
 125    return 0;
 126 }