src/tests/api_speed.c

   1 /*
   2  * (C) Copyright IBM Corporation 2002
   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 api_speed.c
  27  * Simple test to measure the overhead of making GL calls.
  28  *
  29  * The main purpose of this test is to measure the difference in calling
  30  * overhead of different dispatch methods.  Since it uses asm/timex.h to
  31  * access the Pentium's cycle counters, it will probably only compile on
  32  * Linux (though most architectures have a get_cycles function in timex.h).
  33  * That is why it isn't in the default Makefile.
  34  *
  35  * \author Ian Romanick <idr@us.ibm.com>
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #define GL_GLEXT_PROTOTYPES
  41 #include <GL/gl.h>
  42 #include <GL/glext.h>
  43 #include <GL/glut.h>
  44
  45 #define inline __inline__
  46 #include <asm/timex.h>
  47
  48 static float Width = 400;
  49 static float Height = 400;
  50 static unsigned count = 1000000;
  51
  52
  53 static void Idle( void )
  54 {
  55    glutPostRedisplay();
  56 }
  57
  58 #define DO_FUNC(f,p) \
  59    do { \
  60       t0 = get_cycles(); \
  61       for ( i = 0 ; i < count ; i++ ) { \
  62          f p ; \
  63       } \
  64       t1 = get_cycles(); \
  65       printf("%u calls to % 20s required %llu cycles.\n", count, # f, t1 - t0); \
  66    } while( 0 )
  67
  68 /**
  69  * Main display function.  This is the place to add more API calls.
  70  */
  71 static void Display( void )
  72 {
  73    int i;
  74    const float v[3] = { 1.0, 0.0, 0.0 };
  75    cycles_t t0;
  76    cycles_t t1;
  77
  78    glBegin(GL_TRIANGLE_STRIP);
  79
  80    DO_FUNC( glColor3fv, (v) );
  81    DO_FUNC( glNormal3fv, (v) );
  82    DO_FUNC( glTexCoord2fv, (v) );
  83    DO_FUNC( glTexCoord3fv, (v) );
  84    DO_FUNC( glMultiTexCoord2fv, (GL_TEXTURE0, v) );
  85    DO_FUNC( glMultiTexCoord2f, (GL_TEXTURE0, 0.0, 0.0) );
  86    DO_FUNC( glFogCoordfvEXT, (v) );
  87    DO_FUNC( glFogCoordfEXT, (0.5) );
  88
  89    glEnd();
  90
  91    exit(0);
  92 }
  93
  94
  95 static void Reshape( int width, int height )
  96 {
  97    Width = width;
  98    Height = height;
  99    glViewport( 0, 0, width, height );
 100    glMatrixMode( GL_PROJECTION );
 101    glLoadIdentity();
 102    glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
 103    glMatrixMode( GL_MODELVIEW );
 104    glLoadIdentity();
 105 }
 106
 107
 108 static void Key( unsigned char key, int x, int y )
 109 {
 110    (void) x;
 111    (void) y;
 112    switch (key) {
 113       case 27:
 114          exit(0);
 115          break;
 116    }
 117    glutPostRedisplay();
 118 }
 119
 120
 121 int main( int argc, char *argv[] )
 122 {
 123    glutInit( &argc, argv );
 124    glutInitWindowSize( (int) Width, (int) Height );
 125    glutInitWindowPosition( 0, 0 );
 126
 127    glutInitDisplayMode( GLUT_RGB );
 128
 129    glutCreateWindow( argv[0] );
 130
 131    if ( argc > 1 ) {
 132       count = strtoul( argv[1], NULL, 0 );
 133       if ( count == 0 ) {
 134          fprintf( stderr, "Usage: %s [iterations]\n", argv[0] );
 135          exit(1);
 136       }
 137    }
 138
 139    glutReshapeFunc( Reshape );
 140    glutKeyboardFunc( Key );
 141    glutDisplayFunc( Display );
 142    glutIdleFunc( Idle );
 143
 144    glutMainLoop();
 145    return 0;
 146 }