Attachment 134247 Details for Bug 102354 – glx test application

glx test application

test.cpp (text/plain), 12.36 KB, created by Tapani Pälli on 2017-09-15 04:51:07 UTC

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Creator: Tapani Pälli

Created: 2017-09-15 04:51:07 UTC

Size: 12.36 KB

patch

obsolete

>/*
> * Copyright Â© 2017 Intel Corporation
> *
> * Permission is hereby granted, free of charge, to any person obtaining a
> * copy of this software and associated documentation files (the "Software"),
> * to deal in the Software without restriction, including without limitation
> * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> * and/or sell copies of the Software, and to permit persons to whom the
> * Software is furnished to do so, subject to the following conditions:
> *
> * The above copyright notice and this permission notice (including the next
> * paragraph) shall be included in all copies or substantial portions of the
> * Software.
> *
> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> * IN THE SOFTWARE.
> */
>
>/*
> * Tests GLX config/visual selection and sRGB. See init_glx() function for
> * different methods for selection.
> *
> * g++ -g -ggdb -o glxapp test.cpp -lX11 -lXrender -lGL
> *
> */
>
>#include <assert.h>
>#include <stdio.h>
>#include <stdlib.h>
>
>#include <X11/Xlib.h>
>#include <X11/Xatom.h>
>#include <X11/keysym.h>
>#include <X11/extensions/Xrender.h>
>
>#include <GL/glx.h>
>#include <GL/glxext.h>
>
>#include <GL/gl.h>
>#include <GL/glext.h>
>
>static Visual*
>find_depth_visual(Display *dpy, int scr, int depth)
>{
>  XVisualInfo *xvi;
>  XVisualInfo vtemplate;
>  int nvi, i;
>  XRenderPictFormat *format;
>  Visual *visual;
>
>  vtemplate.screen = scr;
>  vtemplate.depth = depth;
>  vtemplate.c_class = TrueColor;
>  xvi = XGetVisualInfo(dpy,
>                       VisualScreenMask |
>                       VisualDepthMask |
>                       VisualClassMask,
>                       &vtemplate,
>                       &nvi);
>  if (xvi == NULL)
>    return NULL;
>
>  visual = NULL;
>  for (i = 0; i < nvi; i++) {
>    format = XRenderFindVisualFormat (dpy, xvi[i].visual);
>    if (format->type == PictTypeDirect && format->direct.alphaMask) {
>      visual = xvi[i].visual;
>      break;
>    }
>  }
>  XFree (xvi);
>  return visual;
>}
>
>static Bool WaitForNotify(Display *d, XEvent *e, char *arg)
>{
>  return (e->type == MapNotify) && (e->xmap.window == (Window) arg);
>}
>
>class glxapp
>{
>public:
>   explicit glxapp(unsigned w, unsigned h)
>   {
>      init_failed = true;
>
>      xdpy  = XOpenDisplay(NULL);
>      scr   = DefaultScreen(xdpy);
>      root  = RootWindow(xdpy, scr);
>      depth = DefaultDepth(xdpy, scr);
>      xres  = ScreenOfDisplay(xdpy, scr)->width;
>      yres  = ScreenOfDisplay(xdpy, scr)->height;
>
>      glxctx = NULL;
>
>#if 1
>      // 'regular' visual
>      vis = DefaultVisual(xdpy, scr);
>#else
>      // visual with per pixel alpha
>      vis = find_depth_visual(xdpy, scr, 32);
>      depth = 32;
>#endif
>
>      if (!vis) {
>         fprintf(stderr, "could not find such X visual\n");
>         return;
>      }
>
>      visual_id = XVisualIDFromVisual(vis);
>      cmap = XCreateColormap(xdpy, root, vis, AllocNone);
>      wa.background_pixel = 0x00000000;
>      wa.colormap = cmap;
>      wa.border_pixel = 0;
>
>      XEvent event;
>
>      // create and map X window
>      xwin = XCreateWindow(xdpy,
>                           root,
>                           0,
>                           0,
>                           w,
>                           h,
>                           0,
>                           depth,
>                           InputOutput,
>                           vis,
>                           CWBackPixel | CWBorderPixel | CWColormap,
>                           &wa);
>
>      delete_atom = XInternAtom(xdpy, "WM_DELETE_WINDOW", False);
>      XSetWMProtocols(xdpy, xwin, &delete_atom, 1);
>      XSelectInput(xdpy, xwin, StructureNotifyMask | VisibilityNotify | ExposureMask | KeyPressMask);
>      XClearWindow(xdpy, xwin);
>      XMapWindow(xdpy, xwin);
>      XFlush(xdpy);
>      XIfEvent(xdpy, &event, WaitForNotify, (char*) xwin);
>
>      fprintf(stderr, "created window with visual id %d\n", visual_id);
>      init_failed = false;
>   }
>
>   int glx_attrib(GLXFBConfig config, int attr)
>   {
>      int value;
>      glXGetFBConfigAttrib(xdpy, config, attr, &value);
>      return value;
>   }
>
>   void print_conf(GLXFBConfig conf)
>   {
>      printf("using visual 0x%x (srgb %d) (rgba %d%d%d%d)\n",
>             glx_attrib(conf, GLX_VISUAL_ID),
>             glx_attrib(conf, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB),
>             glx_attrib(conf, GLX_RED_SIZE),
>             glx_attrib(conf, GLX_GREEN_SIZE),
>             glx_attrib(conf, GLX_BLUE_SIZE),
>             glx_attrib(conf, GLX_ALPHA_SIZE));
>   }
>
>   /* 1. glXGetFBConfigs
>    * 2. investigate attributes, match with x window visual id
>    * 3. ask for sRGB via glXChooseVisual
>    */
>   bool init_glx_by_matching_visual()
>   {
>      int num_elements;
>      GLXFBConfig *conf = glXGetFBConfigs(xdpy, scr, &num_elements);
>
>      if (num_elements <= 0 || !conf)
>         return false;
>
>      // query window attributes, including visual id it got
>      XWindowAttributes attributes;
>      if (!XGetWindowAttributes(xdpy, xwin, &attributes))
>      {
>         fprintf(stderr, "error with XGetWindowAttributes\n");
>         return false;
>      }
>
>      // paranoid check that visual id matches what we've got
>      if (XVisualIDFromVisual(attributes.visual) != visual_id)
>      {
>         fprintf(stderr, "window has different visual than on creation\n");
>         return false;
>      }
>
>      // find GLXFBConfig that matches our visual id and has srgb
>      for (int i = 0; i < num_elements; i++) {
>
>         if (glx_attrib(conf[i], GLX_VISUAL_ID) != visual_id)
>            continue;
>
>         fprintf(stderr, "found a matching visual id (%d)\n", visual_id);
>
>         // ask for srgb
>         int srgb_attr[] = {
>            GLX_RENDER_TYPE, GLX_RGBA_BIT,
>            GLX_RGBA,
>            GLX_RED_SIZE,   8,
>            GLX_GREEN_SIZE, 8,
>            GLX_BLUE_SIZE,  8,
>            GLX_ALPHA_SIZE, 0,
>            GLX_DEPTH_SIZE, 8,
>            GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB,
>            None
>         };
>
>         XVisualInfo *vi = glXChooseVisual(xdpy, scr, srgb_attr);
>
>         if (!vi) {
>            printf("error with glXChooseVisual\n");
>            return false;
>         }
>
>         print_conf(conf[i]);
>
>         glxctx = glXCreateContext(xdpy, vi, NULL, True);
>         glxwin = glXCreateWindow(xdpy, conf[i], xwin, NULL);
>         XFree(vi);
>      }
>      return true;
>   }
>
>   /* 1. glXChooseFBConfig
>    * 2. investigate attributes, match with GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT
>    * 3. get visual with glXGetVisualFromFBConfig
>    */
>   bool init_glx_by_choosing_config()
>   {
>      const int attr[] = {
>         GLX_RENDER_TYPE, GLX_RGBA_BIT,
>         GLX_RED_SIZE, 4,
>         GLX_GREEN_SIZE, 4,
>         GLX_BLUE_SIZE, 4,
>         GLX_ALPHA_SIZE, 0,
>         GLX_DEPTH_SIZE, 8,
>         GLX_DOUBLEBUFFER, True,
>         GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT, True,
>         None
>      };
>
>      int num_elements;
>      GLXFBConfig *conf = glXChooseFBConfig(xdpy, scr, attr, &num_elements);
>
>      if (num_elements <= 0 || !conf)
>         return false;
>
>      // search one that has GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT set
>      for (int i = 0; i < num_elements; i++) {
>
>         if (glx_attrib(conf[i], GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT) != 1)
>            continue;
>
>         XVisualInfo *vi = glXGetVisualFromFBConfig(xdpy, conf[i]);
>         if (!vi) {
>            printf("no srgb visual found!\n");
>            return false;
>         }
>
>         print_conf(conf[i]);
>
>         glxctx = glXCreateContext(xdpy, vi, NULL, True);
>         glxwin = glXCreateWindow(xdpy, conf[i], xwin, NULL);
>         return true;
>      }
>      return false;
>   }
>
>   /* 1. glXGetFBConfigs
>    * 2. investigate attributes, match with GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT
>    * 3. get visual with glXGetVisualFromFBConfig
>    */
>   bool init_glx_by_searching_for_srgb()
>   {
>      int num_elements;
>      GLXFBConfig *conf = glXGetFBConfigs(xdpy, scr, &num_elements);
>
>      if (num_elements <= 0 || !conf)
>         return false;
>
>      // search first config that has srgb support and has doublebuffer
>      // and no alpha
>      for (unsigned i = 0; i < num_elements; i++) {
>
>         if (glx_attrib(conf[i], GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT) != 1)
>            continue;
>
>         if (glx_attrib(conf[i], GLX_DOUBLEBUFFER) != 1)
>            continue;
>
>         if (glx_attrib(conf[i], GLX_ALPHA_SIZE) != 0)
>            continue;
>
>         XVisualInfo *vi = glXGetVisualFromFBConfig(xdpy, conf[i]);
>         if (!vi) {
>            printf("no srgb visual found for config!\n");
>            return false;
>         } else {
>
>            print_conf(conf[i]);
>
>            glxctx = glXCreateContext(xdpy, vi, NULL, True);
>            glxwin = glXCreateWindow(xdpy, conf[i], xwin, NULL);
>            XFree(vi);
>            return true;
>         }
>      }
>      return false;
>   }
>
>   bool init_glx()
>   {
>      if (init_failed)
>         return false;
>
>      // OPTION 1
>      // this kind of works even though GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB is
>      // set as 0 since glGetFramebufferAttachmentParameterivEXT returns 0x8c40
>      //return init_glx_by_matching_visual();
>
>      // OPTION 2
>      // works nicely, has srgb set
>      //return init_glx_by_searching_for_srgb();
>
>      // OPTION 3
>      // works nicely, has srgb set
>      return init_glx_by_choosing_config();
>
>      return false;
>   }
>
>   ~glxapp()
>   {
>      if (init_failed)
>         return;
>
>      if (glxctx) {
>         glXMakeContextCurrent(xdpy, None, None, glxctx);
>         glXDestroyContext(xdpy, glxctx);
>      }
>
>      XDestroyWindow(xdpy, xwin);
>      XCloseDisplay(xdpy);
>   }
>
>   GLint ask_fb_param(GLenum p)
>   {
>      static PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC func =
>         (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC)
>         glXGetProcAddressARB((const GLubyte*)
>                              "glGetFramebufferAttachmentParameterivEXT");
>      if (func) {
>         GLint param = 0xdeadbeef;
>         func(GL_DRAW_FRAMEBUFFER, GL_BACK_LEFT, p, &param);
>         return param;
>      }
>      return 0xdeadbeef;
>   }
>
>   int exec()
>   {
>      if (init_failed)
>         return -1;
>
>      if (!glxctx)
>         return -1;
>
>      if (!glXMakeCurrent(xdpy, glxwin, glxctx)) {
>         printf("glXMakeCurrent failed\n");
>         return -1;
>      }
>
>      GLint fb_type = ask_fb_param(GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE);
>
>      if (fb_type == GL_NONE) {
>         printf("huh! maybe config was not doublebuffered?\n");
>         return 0;
>      }
>
>      glClearColor(1, 1, 1, 1);
>
>      XEvent event;
>      long key_pressed;
>      Bool done = False;
>
>#define PRINT_PARAM(p) printf("%s 0x%x\n", #p, ask_fb_param(p));
>
>      PRINT_PARAM(GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE);
>      PRINT_PARAM(GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE);
>      PRINT_PARAM(GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE);
>      PRINT_PARAM(GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE);
>      PRINT_PARAM(GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING);
>
>      GLenum err = glGetError();
>      if (err != GL_NO_ERROR) {
>         printf("gl error 0x%x when asking fb parameters\n", err);
>         return 0;
>      }
>
>      while (!done) {
>         if (XEventsQueued(xdpy, QueuedAfterReading) <= 0) {
>            glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
>         } else {
>            XNextEvent(xdpy, &event);
>            switch (event.type) {
>            case ButtonRelease:
>               done = True;
>               break;
>            case KeyPress :
>              key_pressed = XLookupKeysym((XKeyEvent *)&event, 0);
>              if (key_pressed == XK_Escape)
>                 done = True;
>              break;
>            case ClientMessage :
>               if ((signed)event.xclient.data.l[0] == delete_atom)
>                  done = True;
>               break;
>            }
>         }
>         glXSwapBuffers(xdpy, glxwin);
>      }
>      return 0;
>   }
>
>private:
>
>  Display *xdpy;
>  Window xwin;
>  Window root;
>  Atom delete_atom;
>
>  XSetWindowAttributes wa;
>  Colormap cmap;
>  Visual *vis;
>
>  GLXContext glxctx;
>  GLXWindow glxwin;
>
>  bool init_failed;
>
>  // X window visual ID
>  int visual_id;
>
>  int scr;
>  int depth;
>  int xres;
>  int yres;
>};
>
>int main()
>{
>   glxapp app(256, 256);
>
>   if (!app.init_glx()) {
>      printf("error initializing glx\n");
>      return -1;
>   }
>
>   return app.exec();
>}

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Attachments on bug 102354: 134151 | 134169 | 134247 | 134248

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