Attachment 91488 Details for Bug 73282 – reproducer

reproducer

pbtest.c (text/plain), 1.68 KB, created by Alexander Monakov on 2014-01-04 18:05:18 UTC

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Creator: Alexander Monakov

Created: 2014-01-04 18:05:18 UTC

Size: 1.68 KB

patch

obsolete

>#define _GNU_SOURCE
>#include <assert.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <time.h>
>#define GL_GLEXT_PROTOTYPES
>#include <GL/glx.h>
>
>static double get_timestamp()
>{
>  struct timespec tp;
>  clock_gettime(CLOCK_MONOTONIC, &tp);
>  return tp.tv_sec + 1e-9 * tp.tv_nsec;
>}
>
>int main(int argc, char *argv[])
>{
>  int width = 0, height = 0;
>
>  if (argc != 3 || !(width = atoi(argv[1])) || !(height = atoi(argv[2])))
>    {
>      fprintf(stderr, "usage: %s WIDTH HEIGHT\n", argv[0]);
>      return 1;
>    }
>  Display *dpy = XOpenDisplay(NULL);
>
>  int ncfg, attrs[] = {GLX_DOUBLEBUFFER, GL_TRUE, None};
>  GLXFBConfig *dconfigs = glXChooseFBConfig(dpy, 0, attrs, &ncfg);
>  fprintf(stderr, "FBConfig %p\n", dconfigs[0]);
>
>  int pbattrs[] = {GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height, GLX_PRESERVED_CONTENTS, True, None};
>  GLXPbuffer pbuffer = glXCreatePbuffer(dpy, dconfigs[0], pbattrs);
>
>  GLXContext ctx = glXCreateNewContext(dpy, dconfigs[0], GLX_RGBA_TYPE, NULL, True);
>  glXMakeCurrent(dpy, pbuffer, ctx);
>
>  GLuint pbo;
>  glGenBuffers(1, &pbo);
>  glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbo);
>
>  int size = width*height*4;
>  glBufferData(GL_PIXEL_UNPACK_BUFFER_EXT, size, NULL, GL_STREAM_DRAW);
>  void *pixeldata = malloc(size);
>  memset(pixeldata, 0x80, size);
>
>  double end = 0.2 + get_timestamp();
>  int iters = 0;
>  do {
>    glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, size, pixeldata);
>    glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
>    glXSwapBuffers(dpy, pbuffer);
>    iters++;
>  } while (end > get_timestamp());
>
>  free(pixeldata);
>  glDeleteBuffers(1, &pbo);
>  glXDestroyPbuffer(dpy, pbuffer);
>
>  fprintf(stderr, "%d iters\n", iters);
>  return 0;
>}

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Attachments on bug 73282: 91488

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