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