src/gallium/targets/graw-xlib/graw_xlib.c

   1 #include "pipe/p_compiler.h"
   2 #include "pipe/p_context.h"
   3 #include "pipe/p_screen.h"
   4 #include "util/u_debug.h"
   5 #include "util/u_memory.h"
   6 #include "target-helpers/inline_sw_helper.h"
   7 #include "target-helpers/inline_debug_helper.h"
   8 #include "state_tracker/xlib_sw_winsys.h"
   9 #include "state_tracker/graw.h"
  10
  11 #include <X11/Xlib.h>
  12 #include <X11/Xlibint.h>
  13 #include <X11/Xutil.h>
  14 #include <stdio.h>
  15
  16 static struct {
  17    Display *display;
  18    void (*draw)(void);
  19 } graw;
  20
  21
  22 static struct pipe_screen *
  23 graw_create_screen( void )
  24 {
  25    struct pipe_screen *screen = NULL;
  26    struct sw_winsys *winsys = NULL;
  27
  28    /* Create the underlying winsys, which performs presents to Xlib
  29     * drawables:
  30     */
  31    winsys = xlib_create_sw_winsys( graw.display );
  32    if (winsys == NULL)
  33       return NULL;
  34
  35    screen = sw_screen_create( winsys );
  36
  37    /* Inject any wrapping layers we want to here:
  38     */
  39    return debug_screen_wrap( screen );
  40 }
  41
  42
  43 struct pipe_screen *
  44 graw_create_window_and_screen( int x,
  45                                int y,
  46                                unsigned width,
  47                                unsigned height,
  48                                enum pipe_format format,
  49                                void **handle)
  50 {
  51    struct pipe_screen *screen = NULL;
  52    struct xlib_drawable *xlib_handle = NULL;
  53    XSetWindowAttributes attr;
  54    Window root;
  55    Window win = 0;
  56    XVisualInfo templat, *visinfo = NULL;
  57    unsigned mask;
  58    int n;
  59    int scrnum;
  60
  61    graw.display = XOpenDisplay(NULL);
  62    if (graw.display == NULL)
  63       return NULL;
  64
  65    scrnum = DefaultScreen( graw.display );
  66    root = RootWindow( graw.display, scrnum );
  67
  68
  69    if (graw.display == NULL)
  70       goto fail;
  71
  72    xlib_handle = CALLOC_STRUCT(xlib_drawable);
  73    if (xlib_handle == NULL)
  74       goto fail;
  75
  76
  77    mask = VisualScreenMask | VisualDepthMask | VisualClassMask;
  78    templat.screen = DefaultScreen(graw.display);
  79    templat.depth = 32;
  80    templat.class = TrueColor;
  81
  82    visinfo = XGetVisualInfo(graw.display, mask, &templat, &n);
  83    if (!visinfo) {
  84       printf("Error: couldn't get an RGB, Double-buffered visual\n");
  85       exit(1);
  86    }
  87
  88    /* See if the requirested pixel format matches the visual */
  89    if (visinfo->red_mask == 0xff0000 &&
  90        visinfo->green_mask == 0xff00 &&
  91        visinfo->blue_mask == 0xff) {
  92       if (format != PIPE_FORMAT_B8G8R8A8_UNORM)
  93          goto fail;
  94    }
  95    else if (visinfo->red_mask == 0xff &&
  96             visinfo->green_mask == 0xff00 &&
  97             visinfo->blue_mask == 0xff0000) {
  98       if (format != PIPE_FORMAT_R8G8B8A8_UNORM)
  99          goto fail;
 100    }
 101    else {
 102       goto fail;
 103    }
 104
 105    /* window attributes */
 106    attr.background_pixel = 0;
 107    attr.border_pixel = 0;
 108    attr.colormap = XCreateColormap( graw.display, root, visinfo->visual, AllocNone);
 109    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 110    /* XXX this is a bad way to get a borderless window! */
 111    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 112
 113    win = XCreateWindow( graw.display, root, x, y, width, height,
 114                         0, visinfo->depth, InputOutput,
 115                         visinfo->visual, mask, &attr );
 116
 117
 118    /* set hints and properties */
 119    {
 120       char *name = NULL;
 121       XSizeHints sizehints;
 122       sizehints.x = x;
 123       sizehints.y = y;
 124       sizehints.width  = width;
 125       sizehints.height = height;
 126       sizehints.flags = USSize | USPosition;
 127       XSetNormalHints(graw.display, win, &sizehints);
 128       XSetStandardProperties(graw.display, win, name, name,
 129                               None, (char **)NULL, 0, &sizehints);
 130    }
 131
 132    XMapWindow(graw.display, win);
 133    while (1) {
 134       XEvent e;
 135       XNextEvent( graw.display, &e );
 136       if (e.type == MapNotify && e.xmap.window == win) {
 137          break;
 138       }
 139    }
 140
 141    xlib_handle->visual = visinfo->visual;
 142    xlib_handle->drawable = (Drawable)win;
 143    xlib_handle->depth = visinfo->depth;
 144    *handle = (void *)xlib_handle;
 145
 146    screen = graw_create_screen();
 147    if (screen == NULL)
 148       goto fail;
 149
 150    free(visinfo);
 151    return screen;
 152
 153 fail:
 154    if (screen)
 155       screen->destroy(screen);
 156
 157    if (xlib_handle)
 158       FREE(xlib_handle);
 159
 160    if (visinfo)
 161       free(visinfo);
 162
 163    if (win)
 164       XDestroyWindow(graw.display, win);
 165
 166    return NULL;
 167 }
 168
 169
 170 void
 171 graw_set_display_func( void (*draw)( void ) )
 172 {
 173    graw.draw = draw;
 174 }
 175
 176 void
 177 graw_main_loop( void )
 178 {
 179    int i;
 180    for (i = 0; i < 10; i++) {
 181       graw.draw();
 182       sleep(1);
 183    }
 184 }
 185