progs/tests/copypixrate.c

   1 /*
   2  * Measure glCopyPixels speed
   3  *
   4  * Brian Paul
   5  * 26 Jan 2006
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <math.h>
  12 #include <GL/glew.h>
  13 #include <GL/glut.h>
  14
  15 static GLint WinWidth = 1000, WinHeight = 800;
  16 static GLint ImgWidth, ImgHeight;
  17
  18 static GLenum Buffer = GL_FRONT;
  19 static GLenum AlphaTest = GL_FALSE;
  20 static GLboolean UseBlit = GL_FALSE;
  21
  22 static PFNGLBLITFRAMEBUFFEREXTPROC glBlitFramebufferEXT_func = NULL;
  23
  24
  25 /**
  26  * draw teapot in lower-left corner of window
  27  */
  28 static void
  29 DrawTestImage(void)
  30 {
  31    GLfloat ar;
  32
  33    ImgWidth = WinWidth / 3;
  34    ImgHeight = WinHeight / 3;
  35
  36    glViewport(0, 0, ImgWidth, ImgHeight);
  37    glScissor(0, 0, ImgWidth, ImgHeight);
  38    glEnable(GL_SCISSOR_TEST);
  39
  40    glClearColor(0.5, 0.5, 0.5, 0.0);
  41    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  42
  43    ar = (float) WinWidth / WinHeight;
  44
  45    glMatrixMode(GL_PROJECTION);
  46    glLoadIdentity();
  47    glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0);
  48    glMatrixMode(GL_MODELVIEW);
  49
  50    glEnable(GL_LIGHTING);
  51    glEnable(GL_LIGHT0);
  52    glEnable(GL_DEPTH_TEST);
  53    glFrontFace(GL_CW);
  54    glPushMatrix();
  55    glRotatef(45, 1, 0, 0);
  56    glutSolidTeapot(2.0);
  57    glPopMatrix();
  58    glFrontFace(GL_CCW);
  59    glDisable(GL_DEPTH_TEST);
  60    glDisable(GL_LIGHTING);
  61
  62    glDisable(GL_SCISSOR_TEST);
  63
  64    glViewport(0, 0, WinWidth, WinHeight);
  65    glFinish();
  66 }
  67
  68
  69 static int
  70 Rand(int max)
  71 {
  72    return ((int) rand()) % max;
  73 }
  74
  75
  76 static void
  77 BlitOne(void)
  78 {
  79    int x, y;
  80
  81    do {
  82       x = Rand(WinWidth);
  83       y = Rand(WinHeight);
  84    } while (x <= ImgWidth && y <= ImgHeight);
  85
  86 #ifdef GL_EXT_framebuffer_blit
  87    if (UseBlit)
  88    {
  89       glBlitFramebufferEXT_func(0, 0, ImgWidth, ImgHeight,
  90                                 x, y, x + ImgWidth, y + ImgHeight,
  91                                 GL_COLOR_BUFFER_BIT, GL_LINEAR);
  92    }
  93    else
  94 #endif
  95    {
  96       glWindowPos2iARB(x, y);
  97       glCopyPixels(0, 0, ImgWidth, ImgHeight, GL_COLOR);
  98    }
  99 }
 100
 101
 102 /**
 103  * Measure glCopyPixels rate
 104  */
 105 static void
 106 RunTest(void)
 107 {
 108    double t1, t0 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
 109    int iters = 0;
 110    float copyRate, mbRate;
 111    int r, g, b, a, bpp;
 112
 113    if (AlphaTest) {
 114       glEnable(GL_ALPHA_TEST);
 115       glAlphaFunc(GL_GREATER, 0.0);
 116    }
 117
 118    glGetIntegerv(GL_RED_BITS, &r);
 119    glGetIntegerv(GL_GREEN_BITS, &g);
 120    glGetIntegerv(GL_BLUE_BITS, &b);
 121    glGetIntegerv(GL_ALPHA_BITS, &a);
 122    bpp = (r + g + b + a) / 8;
 123
 124    do {
 125       BlitOne();
 126
 127       if (Buffer == GL_FRONT)
 128          glFinish(); /* XXX to view progress */
 129
 130       iters++;
 131
 132       t1 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
 133    } while (t1 - t0 < 5.0);
 134
 135    glDisable(GL_ALPHA_TEST);
 136
 137    copyRate = iters / (t1 - t0);
 138    mbRate = ImgWidth * ImgHeight * bpp * copyRate / (1024 * 1024);
 139
 140    printf("Image size: %d x %d, %d Bpp\n", ImgWidth, ImgHeight, bpp);
 141    printf("%d copies in %.2f = %.2f copies/sec, %.2f MB/s\n",
 142           iters, t1-t0, copyRate, mbRate);
 143 }
 144
 145
 146 static void
 147 Draw(void)
 148 {
 149    glClearColor(0.0, 0.0, 0.0, 0.0);
 150    glClearColor(0.2, 0.2, 0.8, 0);
 151    glReadBuffer(Buffer);
 152    glDrawBuffer(Buffer);
 153    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 154
 155    DrawTestImage();
 156
 157    RunTest();
 158
 159    if (Buffer == GL_FRONT)
 160       glFinish();
 161    else
 162       glutSwapBuffers();
 163
 164 #if 1
 165    printf("exiting\n");
 166    exit(0);
 167 #endif
 168 }
 169
 170
 171 static void
 172 Reshape(int width, int height)
 173 {
 174    glViewport(0, 0, width, height);
 175    glMatrixMode(GL_PROJECTION);
 176    glLoadIdentity();
 177    glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
 178    glMatrixMode(GL_MODELVIEW);
 179    glLoadIdentity();
 180    glTranslatef(0.0, 0.0, -15.0);
 181 }
 182
 183
 184 static void
 185 Key(unsigned char key, int x, int y)
 186 {
 187    (void) x;
 188    (void) y;
 189    switch (key) {
 190    case 'b':
 191       BlitOne();
 192       break;
 193    case 27:
 194       exit(0);
 195       break;
 196    }
 197    glutPostRedisplay();
 198 }
 199
 200
 201 static void
 202 SpecialKey(int key, int x, int y)
 203 {
 204    (void) x;
 205    (void) y;
 206    switch (key) {
 207       case GLUT_KEY_UP:
 208          break;
 209       case GLUT_KEY_DOWN:
 210          break;
 211       case GLUT_KEY_LEFT:
 212          break;
 213       case GLUT_KEY_RIGHT:
 214          break;
 215    }
 216    glutPostRedisplay();
 217 }
 218
 219
 220 static void
 221 ParseArgs(int argc, char *argv[])
 222 {
 223    int i;
 224    for (i = 1; i < argc; i++) {
 225       if (strcmp(argv[i], "-back") == 0)
 226          Buffer = GL_BACK;
 227       else if (strcmp(argv[i], "-alpha") == 0)
 228          AlphaTest = GL_TRUE;
 229       else if (strcmp(argv[i], "-blit") == 0)
 230          UseBlit = GL_TRUE;
 231    }
 232 }
 233
 234
 235 static void
 236 Init(void)
 237 {
 238    if (glutExtensionSupported("GL_EXT_framebuffer_blit")) {
 239       glBlitFramebufferEXT_func = (PFNGLBLITFRAMEBUFFEREXTPROC)
 240          glutGetProcAddress("glBlitFramebufferEXT");
 241    }
 242    else if (UseBlit) {
 243       printf("Warning: GL_EXT_framebuffer_blit not supported.\n");
 244       UseBlit = GL_FALSE;
 245    }
 246 }
 247
 248
 249 int
 250 main(int argc, char *argv[])
 251 {
 252    GLint mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH;
 253    glutInit(&argc, argv);
 254
 255    ParseArgs(argc, argv);
 256    if (AlphaTest)
 257       mode |= GLUT_ALPHA;
 258
 259    glutInitWindowPosition(0, 0);
 260    glutInitWindowSize(WinWidth, WinHeight);
 261    glutInitDisplayMode(mode);
 262    glutCreateWindow(argv[0]);
 263    glewInit();
 264    glutReshapeFunc(Reshape);
 265    glutKeyboardFunc(Key);
 266    glutSpecialFunc(SpecialKey);
 267    glutDisplayFunc(Draw);
 268
 269    printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
 270    printf("Draw Buffer: %s\n", (Buffer == GL_BACK) ? "Back" : "Front");
 271    Init();
 272
 273    glutMainLoop();
 274    return 0;
 275 }