progs/tests/crossbar.c

   1 /*
   2  * (C) Copyright IBM Corporation 2005
   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 crossbar.c
  27  *
  28  * Simple test of GL_ARB_texture_env_crossbar functionality.  Several squares
  29  * are drawn with different texture combine modes, but all should be rendered
  30  * with the same final color.
  31  *
  32  * \author Ian Romanick <idr@us.ibm.com>
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <GL/glew.h>
  39 #include <GL/glut.h>
  40
  41 static const GLint tests[][8] = {
  42    { 1, GL_REPLACE,  GL_PRIMARY_COLOR, GL_PRIMARY_COLOR,
  43      2, GL_REPLACE,  GL_TEXTURE,       GL_PRIMARY_COLOR },
  44    { 3, GL_REPLACE,  GL_PRIMARY_COLOR, GL_PRIMARY_COLOR,
  45      2, GL_SUBTRACT, GL_TEXTURE0,      GL_TEXTURE1 },
  46    { 2, GL_REPLACE,  GL_PRIMARY_COLOR, GL_PRIMARY_COLOR,
  47      2, GL_REPLACE,  GL_TEXTURE0,      GL_TEXTURE0 },
  48    { 2, GL_REPLACE,  GL_PRIMARY_COLOR, GL_PRIMARY_COLOR,
  49      1, GL_SUBTRACT, GL_TEXTURE0,      GL_TEXTURE1 },
  50    { 3, GL_ADD,      GL_TEXTURE1,      GL_TEXTURE1,
  51      2, GL_MODULATE, GL_TEXTURE1,      GL_PREVIOUS },
  52    { 3, GL_ADD,      GL_TEXTURE1,      GL_TEXTURE1,
  53      4, GL_MODULATE, GL_TEXTURE0,      GL_PREVIOUS },
  54 };
  55
  56 #define NUM_TESTS (sizeof(tests) / sizeof(tests[0]))
  57
  58 static int Width = 100 * (NUM_TESTS + 1);
  59 static int Height = 200;
  60 static const GLfloat Near = 5.0, Far = 25.0;
  61
  62
  63 static void Display( void )
  64 {
  65    unsigned i;
  66
  67
  68    glClearColor(0.2, 0.2, 0.8, 0);
  69    glClear( GL_COLOR_BUFFER_BIT );
  70
  71    glPushMatrix();
  72
  73    /* This is the "reference" square.
  74     */
  75
  76    glActiveTexture( GL_TEXTURE0 );
  77    glDisable( GL_TEXTURE_2D );
  78    glActiveTexture( GL_TEXTURE1 );
  79    glDisable( GL_TEXTURE_2D );
  80
  81    glTranslatef(-(NUM_TESTS * 1.5), 0, 0);
  82    glBegin(GL_QUADS);
  83    glColor3f( 0.5, 0.5, 0.5 );
  84    glVertex2f(-1, -1);
  85    glVertex2f( 1, -1);
  86    glVertex2f( 1,  1);
  87    glVertex2f(-1,  1);
  88    glEnd();
  89
  90    for ( i = 0 ; i < NUM_TESTS ; i++ ) {
  91       glActiveTexture( GL_TEXTURE0 );
  92       glEnable( GL_TEXTURE_2D );
  93       glBindTexture( GL_TEXTURE_2D, tests[i][0] );
  94       glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE );
  95       glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB, tests[i][1] );
  96       glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB, tests[i][2] );
  97       glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB, tests[i][3] );
  98
  99       glActiveTexture( GL_TEXTURE1 );
 100       glEnable( GL_TEXTURE_2D );
 101       glBindTexture( GL_TEXTURE_2D, tests[i][4] );
 102       glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE );
 103       glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB, tests[i][5] );
 104       glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB, tests[i][6] );
 105       glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB, tests[i][7] );
 106
 107       glCallList(1);
 108    }
 109
 110    glPopMatrix();
 111
 112    glutSwapBuffers();
 113 }
 114
 115
 116 static void Reshape( int width, int height )
 117 {
 118    GLfloat ar = (float) width / (float) height;
 119    Width = width;
 120    Height = height;
 121    glViewport( 0, 0, width, height );
 122    glMatrixMode( GL_PROJECTION );
 123    glLoadIdentity();
 124    glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
 125    glMatrixMode( GL_MODELVIEW );
 126    glLoadIdentity();
 127    glTranslatef( 0.0, 0.0, -15.0 );
 128 }
 129
 130
 131 static void Key( unsigned char key, int x, int y )
 132 {
 133    (void) x;
 134    (void) y;
 135    switch (key) {
 136       case 27:
 137          exit(0);
 138          break;
 139    }
 140    glutPostRedisplay();
 141 }
 142
 143
 144 static void Init( void )
 145 {
 146    const char * const ver_string = (const char * const)
 147        glGetString( GL_VERSION );
 148    float ver = strtof( ver_string, NULL );
 149    GLint tex_units;
 150    GLint temp[ 256 ];
 151
 152
 153    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 154    printf("GL_VERSION = %s\n", ver_string);
 155
 156    if ( (!glutExtensionSupported("GL_ARB_multitexture")
 157          && (ver < 1.3))
 158         || (!glutExtensionSupported("GL_ARB_texture_env_combine")
 159             && !glutExtensionSupported("GL_EXT_texture_env_combine")
 160             && (ver < 1.3))
 161         || (!glutExtensionSupported("GL_ARB_texture_env_crossbar")
 162             && !glutExtensionSupported("GL_NV_texture_env_combine4")
 163             && (ver < 1.4)) ) {
 164       printf("\nSorry, this program requires GL_ARB_multitexture and either\n"
 165              "GL_ARB_texture_env_combine or GL_EXT_texture_env_combine (or OpenGL 1.3).\n"
 166              "Either GL_ARB_texture_env_crossbar or GL_NV_texture_env_combine4 (or\n"
 167              "OpenGL 1.4) are also required.\n");
 168       exit(1);
 169    }
 170
 171    glGetIntegerv( GL_MAX_TEXTURE_UNITS, & tex_units );
 172    if ( tex_units < 2 ) {
 173       printf("\nSorry, this program requires at least 2 texture units.\n");
 174       exit(1);
 175    }
 176
 177    printf("\nAll %u squares should be the same color.\n", NUM_TESTS + 1);
 178
 179    (void) memset( temp, 0x00, sizeof( temp ) );
 180    glBindTexture( GL_TEXTURE_2D, 1 );
 181    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 182    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 183    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0,
 184                  GL_RGBA, GL_UNSIGNED_BYTE, temp );
 185
 186    (void) memset( temp, 0x7f, sizeof( temp ) );
 187    glBindTexture( GL_TEXTURE_2D, 2 );
 188    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 189    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 190    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0,
 191                  GL_RGBA, GL_UNSIGNED_BYTE, temp );
 192
 193    (void) memset( temp, 0xff, sizeof( temp ) );
 194    glBindTexture( GL_TEXTURE_2D, 3 );
 195    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 196    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 197    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0,
 198                  GL_RGBA, GL_UNSIGNED_BYTE, temp );
 199
 200    (void) memset( temp, 0x3f, sizeof( temp ) );
 201    glBindTexture( GL_TEXTURE_2D, 4 );
 202    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
 203    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 204    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0,
 205                  GL_RGBA, GL_UNSIGNED_BYTE, temp );
 206
 207
 208    glNewList( 1, GL_COMPILE );
 209    glTranslatef(3.0, 0, 0);
 210    glBegin(GL_QUADS);
 211    glColor3f( 0.9, 0.0, 0.0 );
 212    glMultiTexCoord2f( GL_TEXTURE0, 0.5, 0.5 );
 213    glMultiTexCoord2f( GL_TEXTURE1, 0.5, 0.5 );
 214    glVertex2f(-1, -1);
 215    glVertex2f( 1, -1);
 216    glVertex2f( 1,  1);
 217    glVertex2f(-1,  1);
 218    glEnd();
 219    glEndList();
 220 }
 221
 222
 223 int main( int argc, char *argv[] )
 224 {
 225    glutInit( &argc, argv );
 226    glutInitWindowPosition( 0, 0 );
 227    glutInitWindowSize( Width, Height );
 228    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 229    glutCreateWindow( "GL_ARB_texture_env_crossbar test" );
 230    glewInit();
 231    glutReshapeFunc( Reshape );
 232    glutKeyboardFunc( Key );
 233    glutDisplayFunc( Display );
 234    Init();
 235    glutMainLoop();
 236    return 0;
 237 }