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-rw-r--r--progs/demos/trispd.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/progs/demos/trispd.c b/progs/demos/trispd.c
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+/* $Id: trispd.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */
+
+/*
+ * Simple GLUT program to measure triangle strip rendering speed.
+ * Brian Paul February 15, 1997 This file is in the public domain.
+ */
+
+/*
+ * $Log: trispd.c,v $
+ * Revision 1.1 1999/08/19 00:55:40 jtg
+ * Initial revision
+ *
+ * Revision 3.4 1999/03/28 18:24:37 brianp
+ * minor clean-up
+ *
+ * Revision 3.3 1999/03/18 08:16:52 joukj
+ *
+ * cmpstr needs string.h to included to avoid warnings
+ *
+ * Revision 3.2 1998/07/08 03:02:00 brianp
+ * added Marten Stromberg's texture options
+ *
+ * Revision 3.1 1998/06/29 02:36:58 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 float Width = 400.0;
+static float Height = 400.0;
+static int Loops = 1;
+static int Size = 50;
+static int Texture = 0;
+
+
+
+static void Idle( void )
+{
+ glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+ float x, y;
+ float xStep;
+ float yStep;
+ double t0, t1;
+ double triRate;
+ double pixelRate;
+ int triCount;
+ int i;
+ float red[3] = { 1.0, 0.0, 0.0 };
+ float blue[3] = { 0.0, 0.0, 1.0 };
+
+ xStep = yStep = sqrt( 2.0 * Size );
+
+ glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+ triCount = 0;
+ t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+ if (Texture) {
+ float uStep = xStep / Width;
+ float vStep = yStep / Height;
+ float u, v;
+ for (i=0; i<Loops; i++) {
+ for (y=1.0, v=0.0f; y<Height-yStep; y+=yStep, v+=vStep) {
+ glBegin(GL_TRIANGLE_STRIP);
+ for (x=1.0, u=0.0f; x<Width; x+=xStep, u+=uStep) {
+ glColor3fv(red);
+ glTexCoord2f(u, v);
+ glVertex2f(x, y);
+ glColor3fv(blue);
+ glTexCoord2f(u, v+vStep);
+ glVertex2f(x, y+yStep);
+ triCount += 2;
+ }
+ glEnd();
+ triCount -= 2;
+ }
+ }
+ }
+ else {
+ for (i=0; i<Loops; i++) {
+ for (y=1.0; y<Height-yStep; y+=yStep) {
+ glBegin(GL_TRIANGLE_STRIP);
+ for (x=1.0; x<Width; x+=xStep) {
+ glColor3fv(red);
+ glVertex2f(x, y);
+ glColor3fv(blue);
+ glVertex2f(x, y+yStep);
+ triCount += 2;
+ }
+ glEnd();
+ triCount -= 2;
+ }
+ }
+ }
+ t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+
+ if (t1-t0 < MinPeriod) {
+ /* Next time draw more triangles to get longer elapsed time */
+ Loops *= 2;
+ return;
+ }
+
+ triRate = triCount / (t1-t0);
+ pixelRate = triRate * Size;
+ printf("Rate: %d tri in %gs = %g tri/s %d pixels/s\n",
+ triCount, t1-t0, triRate, (int)pixelRate);
+
+ glutSwapBuffers();
+}
+
+
+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 LoadTex(int comp, int filter)
+{
+ GLubyte *pixels;
+ int x, y;
+ pixels = malloc(4*256*256);
+ for (y = 0; y < 256; ++y)
+ for (x = 0; x < 256; ++x) {
+ pixels[(y*256+x)*4+0] = (int)(128.5 + 127.0 * cos(0.024544 * x));
+ pixels[(y*256+x)*4+1] = 255;
+ pixels[(y*256+x)*4+2] = (int)(128.5 + 127.0 * cos(0.024544 * y));
+ pixels[(y*256+x)*4+3] = 255;
+ }
+ glEnable(GL_TEXTURE_2D);
+ glTexImage2D(GL_TEXTURE_2D, 0, comp, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+ printf("Texture: GL_MODULATE, %d comps, %s\n", comp, filter == GL_NEAREST ? "GL_NEAREST" : "GL_LINEAR");
+}
+
+
+static void Init( int argc, char *argv[] )
+{
+ GLint shade;
+ GLint rBits, gBits, bBits;
+ int filter = GL_NEAREST, comp = 3;
+
+ int i;
+ for (i=1; i<argc; i++) {
+ if (strcmp(argv[i],"-dither")==0)
+ glDisable(GL_DITHER);
+ else if (strcmp(argv[i],"+dither")==0)
+ glEnable(GL_DITHER);
+ else if (strcmp(argv[i],"+smooth")==0)
+ glShadeModel(GL_SMOOTH);
+ else if (strcmp(argv[i],"+flat")==0)
+ glShadeModel(GL_FLAT);
+ else if (strcmp(argv[i],"+depth")==0)
+ glEnable(GL_DEPTH_TEST);
+ else if (strcmp(argv[i],"-depth")==0)
+ glDisable(GL_DEPTH_TEST);
+ else if (strcmp(argv[i],"-size")==0) {
+ Size = atoi(argv[i+1]);
+ i++;
+ }
+ else if (strcmp(argv[i],"-texture")==0)
+ Texture = 0;
+ else if (strcmp(argv[i],"+texture")==0)
+ Texture = 1;
+ else if (strcmp(argv[i],"-linear")==0)
+ filter = GL_NEAREST;
+ else if (strcmp(argv[i],"+linear")==0)
+ filter = GL_LINEAR;
+ else if (strcmp(argv[i],"-persp")==0)
+ glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
+ else if (strcmp(argv[i],"+persp")==0)
+ glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+ else if (strcmp(argv[i],"-comp")==0) {
+ comp = atoi(argv[i+1]);
+ i++;
+ }
+ else
+ printf("Unknown option: %s\n", argv[i]);
+ }
+
+ glGetIntegerv(GL_SHADE_MODEL, &shade);
+
+ printf("Dither: %s\n", glIsEnabled(GL_DITHER) ? "on" : "off");
+ printf("ShadeModel: %s\n", (shade==GL_FLAT) ? "flat" : "smooth");
+ printf("DepthTest: %s\n", glIsEnabled(GL_DEPTH_TEST) ? "on" : "off");
+ printf("Size: %d pixels\n", Size);
+
+ if (Texture)
+ LoadTex(comp, filter);
+
+ glGetIntegerv(GL_RED_BITS, &rBits);
+ glGetIntegerv(GL_GREEN_BITS, &gBits);
+ glGetIntegerv(GL_BLUE_BITS, &bBits);
+ printf("RedBits: %d GreenBits: %d BlueBits: %d\n", rBits, gBits, bBits);
+}
+
+
+static void Help( const char *program )
+{
+ printf("%s options:\n", program);
+ printf(" +/-dither enable/disable dithering\n");
+ printf(" +/-depth enable/disable depth test\n");
+ printf(" +flat flat shading\n");
+ printf(" +smooth smooth shading\n");
+ printf(" -size pixels specify pixels/triangle\n");
+ printf(" +/-texture enable/disable texture\n");
+ printf(" -comp n texture format\n");
+ printf(" +/-linear bilinear texture filter\n");
+ printf(" +/-persp perspective correction hint\n");
+}
+
+
+int main( int argc, char *argv[] )
+{
+ printf("For options: %s -help\n", argv[0]);
+ glutInit( &argc, argv );
+ glutInitWindowSize( (int) Width, (int) Height );
+ glutInitWindowPosition( 0, 0 );
+
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+
+ glutCreateWindow( argv[0] );
+
+ if (argc==2 && strcmp(argv[1],"-help")==0) {
+ Help(argv[0]);
+ return 0;
+ }
+
+ Init( argc, argv );
+
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ glutIdleFunc( Idle );
+
+ glutMainLoop();
+ return 0;
+}
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