From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001
From: jtg <jtg>
Date: Thu, 19 Aug 1999 00:55:39 +0000
Subject: Initial revision

---
 progs/demos/clearspd.c | 221 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 221 insertions(+)
 create mode 100644 progs/demos/clearspd.c

(limited to 'progs/demos/clearspd.c')

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;
+}
-- 
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