diff options
Diffstat (limited to 'progs/demos/clearspd.c')
| -rw-r--r-- | progs/demos/clearspd.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/progs/demos/clearspd.c b/progs/demos/clearspd.c new file mode 100644 index 0000000000..b2edf32069 --- /dev/null +++ b/progs/demos/clearspd.c @@ -0,0 +1,221 @@ +/* $Id: clearspd.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ + +/* + * Simple GLUT program to measure glClear() and glutSwapBuffers() speed. + * Brian Paul February 15, 1997 This file in public domain. + */ + +/* + * $Log: clearspd.c,v $ + * Revision 1.1 1999/08/19 00:55:40 jtg + * Initial revision + * + * Revision 3.3 1999/03/28 18:18:33 brianp + * minor clean-up + * + * Revision 3.2 1999/03/18 08:16:34 joukj + * + * cmpstr needs string.h to included to avoid warnings + * + * Revision 3.1 1998/06/29 02:38:30 brianp + * removed unneeded includes + * + * Revision 3.0 1998/02/14 18:42:29 brianp + * initial rev + * + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <string.h> +#include <GL/glut.h> + + +static float MinPeriod = 2.0; /* 2 seconds */ +static int ColorMode = GLUT_RGB; +static int Width = 400.0; +static int Height = 400.0; +static int Loops = 100; +static float ClearColor = 0.0; +static GLbitfield BufferMask = GL_COLOR_BUFFER_BIT; +static GLboolean SwapFlag = GL_FALSE; + + + +static void Idle( void ) +{ + glutPostRedisplay(); +} + + +static void Display( void ) +{ + double t0, t1; + double clearRate; + double pixelRate; + int i; + + glClearColor( ClearColor, ClearColor, ClearColor, 0.0 ); + ClearColor += 0.1; + if (ClearColor>1.0) + ClearColor = 0.0; + + if (SwapFlag) { + t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001; + for (i=0;i<Loops;i++) { + glClear( BufferMask ); + glutSwapBuffers(); + } + t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001; + } + else { + t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001; + for (i=0;i<Loops;i++) { + glClear( BufferMask ); + } + t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001; + glutSwapBuffers(); + } + + if (t1-t0 < MinPeriod) { + /* Next time do more clears to get longer elapsed time */ + Loops *= 2; + return; + } + + clearRate = Loops / (t1-t0); + pixelRate = clearRate * Width * Height; + if (SwapFlag) { + printf("Rate: %d clears+swaps in %gs = %g clears+swaps/s %d pixels/s\n", + Loops, t1-t0, clearRate, (int)pixelRate ); + } + else { + printf("Rate: %d clears in %gs = %g clears/s %d pixels/s\n", + Loops, t1-t0, clearRate, (int)pixelRate); + } +} + + +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(); +} + + +static void Init( int argc, char *argv[] ) +{ + int i; + for (i=1; i<argc; i++) { + if (strcmp(argv[i],"+rgb")==0) + ColorMode = GLUT_RGB; + else if (strcmp(argv[i],"+ci")==0) + ColorMode = GLUT_INDEX; + else if (strcmp(argv[i],"-color")==0) + BufferMask = 0; + else if (strcmp(argv[i],"+depth")==0) + BufferMask |= GL_DEPTH_BUFFER_BIT; + else if (strcmp(argv[i],"+alpha")==0) + ColorMode = GLUT_RGB | GLUT_ALPHA; + else if (strcmp(argv[i],"+stencil")==0) + BufferMask |= GL_STENCIL_BUFFER_BIT; + else if (strcmp(argv[i],"+accum")==0) + BufferMask |= GL_ACCUM_BUFFER_BIT; + else if (strcmp(argv[i],"-width")==0) { + Width = atoi(argv[i+1]); + i++; + } + else if (strcmp(argv[i],"-height")==0) { + Height = atoi(argv[i+1]); + i++; + } + else if (strcmp(argv[i],"+swap")==0) { + SwapFlag = GL_TRUE; + } + else if (strcmp(argv[i],"-swap")==0) { + SwapFlag = GL_FALSE; + } + else + printf("Unknown option: %s\n", argv[i]); + } + + if (ColorMode & GLUT_ALPHA) + printf("Mode: RGB + Alpha\n"); + else if (ColorMode==GLUT_RGB) + printf("Mode: RGB\n"); + else + printf("Mode: Color Index\n"); + printf("SwapBuffers: %s\n", SwapFlag ? "yes" : "no" ); + printf("Size: %d x %d\n", Width, Height); + printf("Buffers: "); + if (BufferMask & GL_COLOR_BUFFER_BIT) printf("color "); + if (BufferMask & GL_DEPTH_BUFFER_BIT) printf("depth "); + if (BufferMask & GL_STENCIL_BUFFER_BIT) printf("stencil "); + if (BufferMask & GL_ACCUM_BUFFER_BIT) printf("accum "); + printf("\n"); +} + + +static void Help( const char *program ) +{ + printf("%s options:\n", program); + printf(" +rgb RGB mode\n"); + printf(" +ci color index mode\n"); + printf(" -color don't clear color buffer\n"); + printf(" +alpha clear alpha buffer\n"); + printf(" +depth clear depth buffer\n"); + printf(" +stencil clear stencil buffer\n"); + printf(" +accum clear accum buffer\n"); + printf(" +swap also do SwapBuffers\n"); + printf(" -swap don't do SwapBuffers\n"); +} + + +int main( int argc, char *argv[] ) +{ + printf("For options: %s -help\n", argv[0]); + + Init( argc, argv ); + + glutInit( &argc, argv ); + glutInitWindowSize( (int) Width, (int) Height ); + glutInitWindowPosition( 0, 0 ); + + glutInitDisplayMode( ColorMode | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL | GLUT_ACCUM ); + + glutCreateWindow( argv[0] ); + + if (argc==2 && strcmp(argv[1],"-help")==0) { + Help(argv[0]); + return 0; + } + + glutReshapeFunc( Reshape ); + glutKeyboardFunc( Key ); + glutDisplayFunc( Display ); + glutIdleFunc( Idle ); + + glutMainLoop(); + return 0; +} |