Attachment 92812 Details for Bug 74083 – reproducer

reproducer

t.c (text/plain), 1.42 KB, created by Alexander Monakov on 2014-01-26 13:18:35 UTC

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Creator: Alexander Monakov

Created: 2014-01-26 13:18:35 UTC

Size: 1.42 KB

patch

obsolete

>#include <stdlib.h>
>#include <string.h>
>#define GL_GLEXT_PROTOTYPES
>#include <GL/glx.h>
>
>int main(int argc, char *argv[])
>{
>  int width = 300, height = 300;
>
>  Display *dpy = XOpenDisplay(NULL);
>
>  int ncfg, attrs[] = {GLX_DOUBLEBUFFER, GL_TRUE, None};
>  GLXFBConfig *dconfigs = glXChooseFBConfig(dpy, 0, attrs, &ncfg);
>
>  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);
>
>  glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, size, pixeldata);
>  glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
>  glXSwapBuffers(dpy, pbuffer);
>
>  GLXPbuffer pbuffer2 = glXCreatePbuffer(dpy, dconfigs[0], pbattrs);
>
>  glXMakeCurrent(dpy, pbuffer2, ctx);
>
>  glBufferSubData(GL_PIXEL_UNPACK_BUFFER_EXT, 0, size, pixeldata);
>  glDrawPixels(width, height, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
>  glXSwapBuffers(dpy, pbuffer2);
>
>  free(pixeldata);
>  glDeleteBuffers(1, &pbo);
>  glXDestroyPbuffer(dpy, pbuffer);
>  glXDestroyPbuffer(dpy, pbuffer2);
>
>  return 0;
>}

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Attachments on bug 74083: 92812

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