Attachment 97323 Details for Bug 77412 – reproducer

reproducer

drawpixtest.c (text/plain), 1.33 KB, created by Alexander Monakov on 2014-04-13 21:30:44 UTC

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Creator: Alexander Monakov

Created: 2014-04-13 21:30:44 UTC

Size: 1.33 KB

patch

obsolete

>/*usr/bin/env cat >/tmp/r.c <<ZZZ; gcc -O /tmp/r.c -lGL -lX11 -o /tmp/r && /tmp/r # */
>#include <stdlib.h>
>#include <stdio.h>
>#define GL_GLEXT_PROTOTYPES
>#include <GL/glx.h>
>
>//#define T(c) ({fprintf(stderr, "before %s\n", #c); c; fprintf(stderr, "after %s\n", #c);})
>#define T(c) c
>
>int main(int argc, char *argv[])
>{
>  int i, n, width = 1024, height = 512;
>
>  Display *dpy = XOpenDisplay(NULL);
>
>  int ncfg, attrs[] = {GLX_DOUBLEBUFFER, GL_TRUE, GLX_SAMPLES, 1, None};
>  GLXFBConfig *dconfigs = glXChooseFBConfig(dpy, 0, attrs, &ncfg);
>
>  GLXContext ctx = glXCreateNewContext(dpy, dconfigs[0], GLX_RGBA_TYPE, NULL, True);
>
>  Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, width, height, 0, 0, 0);
>  XMapWindow(dpy, w);
>
>  glXMakeCurrent(dpy, w, ctx);
>
>  GLuint pbo;
>  glGenBuffers(1, &pbo);
>  glBindBuffer(GL_PIXEL_UNPACK_BUFFER_EXT, pbo);
>
>  int size = width*height*4;
>  T(glBufferData(GL_PIXEL_UNPACK_BUFFER_EXT, size, NULL, GL_STREAM_DRAW));
>  int *pixeldata = malloc(size);
>  for (i = 0; i < size / 4; i++)
>    pixeldata[i] = i | (i << 8);
>
>  n = argc == 2 ? atoi(argv[1]) : 1000;
>  for (i = 0; i < n; i++)
>    {
>      T(glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, size - i * 4, pixeldata + i));
>      T(glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL));
>      T(glXSwapBuffers(dpy, w));
>    }
>
>  return 0;
>}
>#define ZZZ
>ZZZ

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Attachments on bug 77412: 97323

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