Attachment 136929 Details for Bug 104760 – text3dsizelimit.c

text3dsizelimit.c

tex3dsizelimit.c (text/x-csrc), 2.28 KB, created by xinghua on 2018-01-24 04:39:32 UTC

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Creator: xinghua

Created: 2018-01-24 04:39:32 UTC

Size: 2.28 KB

patch

obsolete

>// -- Written in C -- //
>#include<stdio.h>
>#include<stdlib.h>
>#include<epoxy/gl.h>
>#include<epoxy/glx.h>
>#include<X11/X.h>
>#include<X11/Xlib.h>
>/*#include<GL/gl.h>
>#include<GL/glx.h>*/
>
>Display                 *dpy;
>Window                  root;
>GLint                   att[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
>XVisualInfo             *vi;
>Colormap                cmap;
>XSetWindowAttributes    swa;
>Window                  win, win1;
>GLXContext              glc;
>XWindowAttributes       gwa;
>XEvent                  xev;
>
>int numLevelsFromSize(int maxTexSize)
>{
>  int levels = 0;
>  while ((maxTexSize >> levels) > 0)
>  {
>    levels++;
>  }
>
>  return levels;
>}
>                   
>int main(int argc, char *argv[]) {
>  dpy = XOpenDisplay(NULL);
>  if(dpy == NULL) {
>     printf("\n\tcannot connect to X server\n\n");
>     exit(0);
>  }
>                                                
>  root = DefaultRootWindow(dpy);
>  vi = glXChooseVisual(dpy, 0, att);
>  if(vi == NULL) {
>     printf("\n\tno appropriate visual found\n\n");
>     exit(0);
>  } 
>  else {
>     printf("\n\tvisual %p selected\n", (void *)vi->visualid); /* %p creates hexadecimal output like in glxinfo */
>  }
>
>  cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);
>  swa.colormap = cmap;
>  swa.event_mask = ExposureMask | KeyPressMask;
>  win = XCreateWindow(dpy, root, 0, 0, 600, 600, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);
>  XMapWindow(dpy, win);
>  XStoreName(dpy, win, "VERY SIMPLE APPLICATION");
>  glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
>  glXMakeCurrent(dpy, win, glc);
>  glEnable(GL_DEPTH_TEST);
>  win1 = XCreateWindow(dpy, root, 0, 0, 800, 800, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);
>  glXMakeCurrent(dpy, win1, glc);
>
>  int maxTexSize = 0;
>  glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, &maxTexSize);
>  int maxLevels = numLevelsFromSize(maxTexSize);
>
>  int texture = 0;
>  glGenTextures(1, &texture);
>  glBindTexture(GL_TEXTURE_3D, texture);
>  for(int i = 0; i < maxLevels; i++)
>  {
>    int size = 1 << i;
>    int level = maxLevels - i - 1;
>    glTexImage3D(GL_TEXTURE_3D, level, GL_RGBA, size, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
>  }
>  
>  glXMakeCurrent(dpy, None, NULL);
>  glXDestroyContext(dpy, glc);
>  XDestroyWindow(dpy, win);
>  XCloseDisplay(dpy);
>  exit(0);
>}

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Attachments on bug 104760: 136929 | 141168 | 142833 | 143364

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