diff options
author | Ian Romanick <idr@us.ibm.com> | 2004-05-26 16:38:38 +0000 |
---|---|---|
committer | Ian Romanick <idr@us.ibm.com> | 2004-05-26 16:38:38 +0000 |
commit | 63b2e426acc81b0b5da82ca290ea42b5c9db7423 (patch) | |
tree | 94dab04c45183400c077f14fb0e5f8602f370533 /progs/tests/api_speed.c | |
parent | e6e0ba781b0a6a1b8747cae49ca622a6a61b1bf8 (diff) |
Test the overhead of just calling a GL function. The Python script is
a helper to do multiple runs and compare the results.
Diffstat (limited to 'progs/tests/api_speed.c')
-rw-r--r-- | progs/tests/api_speed.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/progs/tests/api_speed.c b/progs/tests/api_speed.c new file mode 100644 index 0000000000..f42c73dfc9 --- /dev/null +++ b/progs/tests/api_speed.c @@ -0,0 +1,146 @@ +/* + * (C) Copyright IBM Corporation 2002 + * 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 api_speed.c + * Simple test to measure the overhead of making GL calls. + * + * The main purpose of this test is to measure the difference in calling + * overhead of different dispatch methods. Since it uses asm/timex.h to + * access the Pentium's cycle counters, it will probably only compile on + * Linux (though most architectures have a get_cycles function in timex.h). + * That is why it isn't in the default Makefile. + * + * \author Ian Romanick <idr@us.ibm.com> + */ + +#include <stdio.h> +#include <stdlib.h> +#define GL_GLEXT_PROTOTYPES +#include <GL/gl.h> +#include <GL/glext.h> +#include <GL/glut.h> + +#define inline __inline__ +#include <asm/timex.h> + +static float Width = 400; +static float Height = 400; +static unsigned count = 1000000; + + +static void Idle( void ) +{ + glutPostRedisplay(); +} + +#define DO_FUNC(f,p) \ + do { \ + t0 = get_cycles(); \ + for ( i = 0 ; i < count ; i++ ) { \ + f p ; \ + } \ + t1 = get_cycles(); \ + printf("%u calls to % 20s required %llu cycles.\n", count, # f, t1 - t0); \ + } while( 0 ) + +/** + * Main display function. This is the place to add more API calls. + */ +static void Display( void ) +{ + int i; + const float v[3] = { 1.0, 0.0, 0.0 }; + cycles_t t0; + cycles_t t1; + + glBegin(GL_TRIANGLE_STRIP); + + DO_FUNC( glColor3fv, (v) ); + DO_FUNC( glNormal3fv, (v) ); + DO_FUNC( glTexCoord2fv, (v) ); + DO_FUNC( glTexCoord3fv, (v) ); + DO_FUNC( glMultiTexCoord2fv, (GL_TEXTURE0, v) ); + DO_FUNC( glMultiTexCoord2f, (GL_TEXTURE0, 0.0, 0.0) ); + DO_FUNC( glFogCoordfv, (v) ); + DO_FUNC( glFogCoordf, (0.5) ); + + glEnd(); + + exit(0); +} + + +static void Reshape( int width, int height ) +{ + Width = width; + Height = height; + glViewport( 0, 0, width, height ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glOrtho(0.0, width, 0.0, height, -1.0, 1.0); + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); +} + + +static void Key( unsigned char key, int x, int y ) +{ + (void) x; + (void) y; + switch (key) { + case 27: + exit(0); + break; + } + glutPostRedisplay(); +} + + +int main( int argc, char *argv[] ) +{ + glutInit( &argc, argv ); + glutInitWindowSize( (int) Width, (int) Height ); + glutInitWindowPosition( 0, 0 ); + + glutInitDisplayMode( GLUT_RGB ); + + glutCreateWindow( argv[0] ); + + if ( argc > 1 ) { + count = strtoul( argv[1], NULL, 0 ); + if ( count == 0 ) { + fprintf( stderr, "Usage: %s [iterations]\n", argv[0] ); + exit(1); + } + } + + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + glutIdleFunc( Idle ); + + glutMainLoop(); + return 0; +} |