copypixrate.c - measure the speed of glCopyPixels.

progs/tests/Makefile

@@ -24,6 +24,7 @@ SOURCES = antialias.c \
 	bufferobj.c \
 	bug_3101.c \
 	bug_3195.c \
+	copypixrate.c \
 	crossbar.c \
 	cva.c \
 	dinoshade.c \

progs/tests/copypixrate.c

@@ -0,0 +1,228 @@
+/*
+ * Measure glCopyPixels speed
+ *
+ * Brian Paul
+ * 26 Jan 2006
+ */
+
+#define GL_GLEXT_PROTOTYPES
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static GLint WinWidth = 1000, WinHeight = 800;
+static GLint ImgWidth, ImgHeight;
+
+static GLenum Buffer = GL_FRONT;
+static GLenum AlphaTest = GL_FALSE;
+
+
+/**
+ * draw teapot in lower-left corner of window
+ */
+static void
+DrawTestImage(void)
+{
+   GLfloat ar;
+
+   ImgWidth = WinWidth / 3;
+   ImgHeight = WinHeight / 3;
+
+   glViewport(0, 0, ImgWidth, ImgHeight);
+   glScissor(0, 0, ImgWidth, ImgHeight);
+   glEnable(GL_SCISSOR_TEST);
+
+   glClearColor(0.5, 0.5, 0.5, 0.0);
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   ar = (float) WinWidth / WinHeight;
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glEnable(GL_DEPTH_TEST);
+   glFrontFace(GL_CW);
+   glPushMatrix();
+   glRotatef(45, 1, 0, 0);
+   glutSolidTeapot(2.0);
+   glPopMatrix();
+   glFrontFace(GL_CCW);
+   glDisable(GL_DEPTH_TEST);
+   glDisable(GL_LIGHTING);
+
+   glDisable(GL_SCISSOR_TEST);
+
+   glViewport(0, 0, WinWidth, WinHeight);
+   glFinish();
+}
+
+
+static int
+Rand(int max)
+{
+   return ((int) random()) % max;
+}
+
+
+/**
+ * Measure glCopyPixels rate
+ */
+static void
+RunTest(void)
+{
+   double t1, t0 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+   int iters = 0;
+   float copyRate, mbRate;
+   int r, g, b, a, bpp;
+
+   if (AlphaTest) {
+      glEnable(GL_ALPHA_TEST);
+      glAlphaFunc(GL_GREATER, 0.0);
+   }
+
+   glGetIntegerv(GL_RED_BITS, &r);
+   glGetIntegerv(GL_GREEN_BITS, &g);
+   glGetIntegerv(GL_BLUE_BITS, &b);
+   glGetIntegerv(GL_ALPHA_BITS, &a);
+   bpp = (r + g + b + a) / 8;
+
+   do {
+      int x, y;
+      x = Rand(WinWidth);
+      y = Rand(WinHeight);
+
+      if (x > ImgWidth || y > ImgHeight) {
+         glWindowPos2iARB(x, y);
+         glCopyPixels(0, 0, ImgWidth, ImgHeight, GL_COLOR);
+         glFinish(); /* XXX OK? */
+
+         iters++;
+
+         t1 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+      }
+   } while (t1 - t0 < 5.0);
+
+   glDisable(GL_ALPHA_TEST);
+
+   copyRate = iters / (t1 - t0);
+   mbRate = ImgWidth * ImgHeight * bpp * copyRate / (1024 * 1024);
+
+   printf("Image size: %d x %d, %d Bpp\n", ImgWidth, ImgHeight, bpp);
+   printf("%d copies in %.2f = %.2f copies/sec, %.2f MB/s\n",
+          iters, t1-t0, copyRate, mbRate);
+}
+
+
+static void
+Draw(void)
+{
+   glClearColor(0.0, 0.0, 0.0, 0.0);
+   glClearColor(0.2, 0.2, 0.8, 0);
+   glReadBuffer(Buffer);
+   glDrawBuffer(Buffer);
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   DrawTestImage();
+
+   RunTest();
+
+   if (Buffer == GL_FRONT)
+      glFinish();
+   else
+      glutSwapBuffers();
+
+   printf("exiting\n");
+   exit(0);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -15.0);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         break;
+      case GLUT_KEY_DOWN:
+         break;
+      case GLUT_KEY_LEFT:
+         break;
+      case GLUT_KEY_RIGHT:
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+ParseArgs(int argc, char *argv[])
+{
+   int i;
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-back") == 0)
+         Buffer = GL_BACK;
+      else if (strcmp(argv[i], "-alpha") == 0)
+         AlphaTest = GL_TRUE;
+   }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   GLint mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH;
+   glutInit(&argc, argv);
+
+   ParseArgs(argc, argv);
+   if (AlphaTest)
+      mode |= GLUT_ALPHA;
+
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(WinWidth, WinHeight);
+   glutInitDisplayMode(mode);
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutSpecialFunc(SpecialKey);
+   glutDisplayFunc(Draw);
+
+   printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
+   printf("Draw Buffer: %s\n", (Buffer == GL_BACK) ? "Back" : "Front");
+
+   glutMainLoop();
+   return 0;
+}