summaryrefslogtreecommitdiffstats
path: root/progs/tests/subtexrate.c
blob: f88fdc15216f44b8b54fd32bdc8cda1913e9da1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
/*
 * Measure glTexSubImage and glCopyTexSubImage 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 = 1024, WinHeight = 512;
static GLint TexWidth = 512, TexHeight = 512;

static GLuint TexObj = 1;

static GLenum IntFormat = GL_RGBA8;
static GLenum ReadFormat = GL_RGBA; /* for glReadPixels */

static GLboolean DrawQuad = GL_TRUE;


/**
 * draw teapot image, size TexWidth by TexHeight
 */
static void
DrawTestImage(void)
{
   GLfloat ar;

   glViewport(0, 0, TexWidth, TexHeight);
   glScissor(0, 0, TexWidth, TexHeight);
   glEnable(GL_SCISSOR_TEST);

   glClearColor(0.5, 0.5, 0.5, 0.0);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   ar = (float) TexWidth / TexHeight;

   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);
   glRotatef(45, 0, 1, 0);
   glutSolidTeapot(2.3);
   glPopMatrix();
   glFrontFace(GL_CCW);
   glDisable(GL_DEPTH_TEST);
   glDisable(GL_LIGHTING);

   glDisable(GL_SCISSOR_TEST);

   glViewport(0, 0, WinWidth, WinHeight);
   glFinish();
}


/**
 * Do glCopyTexSubImage2D call (update texture with framebuffer data)
 * If doSubRect is true, do the copy in four pieces instead of all at once.
 */
static void
DoCopyTex(GLboolean doSubRect)
{
   if (doSubRect) {
      /* copy in four parts */
      int w = TexWidth / 2, h = TexHeight / 2;
      int x0 = 0, y0 = 0;
      int x1 = w, y1 = h;
#if 1
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, x0, y0, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, x1, y0, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, x0, y1, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, x1, y1, w, h);
#else
      /* scramble */
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, x1, y1, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, x0, y1, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, x1, y0, w, h);
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, x0, y0, w, h);
#endif
   }
   else {
      glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, TexWidth, TexHeight);
   }
}


/**
 * Do glTexSubImage2D (update texture w/ user data)
 * If doSubRect, do update in four pieces, else all at once.
 */
static void
SubTex(GLboolean doSubRect, const GLubyte *image)
{
   if (doSubRect) {
      /* four pieces */
      int w = TexWidth / 2, h = TexHeight / 2;
      int x0 = 0, y0 = 0;
      int x1 = w, y1 = h;
      glPixelStorei(GL_UNPACK_ROW_LENGTH, TexWidth);
      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

      glPixelStorei(GL_UNPACK_SKIP_ROWS, y0);
      glPixelStorei(GL_UNPACK_SKIP_PIXELS, x0);
      glTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, w, h,
                      ReadFormat, GL_UNSIGNED_BYTE, image);

      glPixelStorei(GL_UNPACK_SKIP_ROWS, y0);
      glPixelStorei(GL_UNPACK_SKIP_PIXELS, x1);
      glTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, w, h,
                      ReadFormat, GL_UNSIGNED_BYTE, image);

      glPixelStorei(GL_UNPACK_SKIP_ROWS, y1);
      glPixelStorei(GL_UNPACK_SKIP_PIXELS, x0);
      glTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, w, h,
                      ReadFormat, GL_UNSIGNED_BYTE, image);

      glPixelStorei(GL_UNPACK_SKIP_ROWS, y1);
      glPixelStorei(GL_UNPACK_SKIP_PIXELS, x1);
      glTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, w, h,
                      ReadFormat, GL_UNSIGNED_BYTE, image);
   }
   else {
      /* all at once */
      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TexWidth, TexHeight,
                      ReadFormat, GL_UNSIGNED_BYTE, image);
   }
}


/**
 * Measure gl[Copy]TexSubImage rate.
 * This actually also includes time to render a quad and SwapBuffers.
 */
static void
RunTest(GLboolean copyTex, GLboolean doSubRect)
{
   double t1, t0 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
   int iters = 0;
   float copyRate, mbRate;
   float rot = 0.0;
   int bpp, r, g, b, a;
   int w, h;
   GLubyte *image = NULL;

   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &r);
   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &g);
   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &b);
   glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &a);
   bpp = (r + g + b + a) / 8;

   if (!copyTex) {
      /* read image from frame buffer */
      image = (GLubyte *) malloc(TexWidth * TexHeight * bpp);
      glPixelStorei(GL_PACK_ALIGNMENT, 1);
      glReadPixels(0, 0, TexWidth, TexHeight,
                   ReadFormat, GL_UNSIGNED_BYTE, image);
   }

   glEnable(GL_TEXTURE_2D);
   glViewport(WinWidth / 2, 0, WinWidth / 2, WinHeight);

   do {
      if (copyTex)
         /* Framebuffer -> Texture */
         DoCopyTex(doSubRect);
      else {
         /* Main Mem -> Texture */
         SubTex(doSubRect, image);
      }

      /* draw textured quad */
      if (DrawQuad) {
         glPushMatrix();
            glRotatef(rot, 0, 0, 1);
            glTranslatef(1, 0, 0);
            glBegin(GL_POLYGON);
               glTexCoord2f(0, 0);  glVertex2f(-1, -1);
               glTexCoord2f(1, 0);  glVertex2f( 1, -1);
               glTexCoord2f(1, 1);  glVertex2f( 1,  1);
               glTexCoord2f(0, 1);  glVertex2f(-1,  1);
            glEnd();
         glPopMatrix();
      }

      iters++;
      rot += 2.0;

      t1 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
      glutSwapBuffers();
   } while (t1 - t0 < 5.0);

   glDisable(GL_TEXTURE_2D);
   if (image)
      free(image);

   if (doSubRect) {
      w = TexWidth / 2;
      h = TexHeight / 2;
      iters *= 4;
   }
   else {
      w = TexWidth;
      h = TexHeight;
   }

   copyRate = iters / (t1 - t0);
   mbRate = w * h * bpp * copyRate / (1024 * 1024);

   if (copyTex)
      printf("glCopyTexSubImage: %d x %d, %d Bpp:\n", w, h, bpp);
   else
      printf("glTexSubImage: %d x %d, %d Bpp:\n", w, h, bpp);
   printf("   %d calls in %.2f = %.2f calls/sec, %.2f MB/s\n",
          iters, t1-t0, copyRate, mbRate);
}


static void
Draw(void)
{
   glClearColor(0.2, 0.2, 0.8, 0);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   DrawTestImage();

   RunTest(GL_FALSE, GL_FALSE);
   RunTest(GL_FALSE, GL_TRUE);
   RunTest(GL_TRUE, GL_FALSE);
   RunTest(GL_TRUE, GL_TRUE);

   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
Init(void)
{
   /* create initial, empty teximage */
   glBindTexture(GL_TEXTURE_2D, TexObj);
   glTexImage2D(GL_TEXTURE_2D, 0, IntFormat, TexWidth, TexHeight, 0,
                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
}



static void
ParseArgs(int argc, char *argv[])
{
   int i;
   for (i = 1; i < argc; i++) {
      if (strcmp(argv[i], "-nodraw") == 0)
         DrawQuad = GL_FALSE;
   }
}


int
main(int argc, char *argv[])
{
   GLint mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH;
   glutInit(&argc, argv);

   ParseArgs(argc, argv);

   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));
   Init();

   glutMainLoop();
   return 0;
}