ui/gtk-egl.c

   1 /*
   2  * GTK UI -- egl opengl code.
   3  *
   4  * Note that gtk 3.16+ (released 2015-03-23) has a GtkGLArea widget,
   5  * which is GtkDrawingArea like widget with opengl rendering support.
   6  *
   7  * This code handles opengl support on older gtk versions, using egl
   8  * to get a opengl context for the X11 window.
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13
  14 #include "qemu-common.h"
  15
  16 #include "trace.h"
  17
  18 #include "ui/console.h"
  19 #include "ui/gtk.h"
  20 #include "ui/egl-helpers.h"
  21
  22 #include "sysemu/sysemu.h"
  23
  24 /** DisplayState Callbacks (opengl version) **/
  25
  26 void gd_egl_init(VirtualConsole *vc)
  27 {
  28     GdkWindow *gdk_window = gtk_widget_get_window(vc->gfx.drawing_area);
  29     if (!gdk_window) {
  30         return;
  31     }
  32
  33 #if GTK_CHECK_VERSION(3, 0, 0)
  34     Window x11_window = gdk_x11_window_get_xid(gdk_window);
  35 #else
  36     Window x11_window = gdk_x11_drawable_get_xid(gdk_window);
  37 #endif
  38     if (!x11_window) {
  39         return;
  40     }
  41
  42     vc->gfx.ectx = qemu_egl_init_ctx();
  43     vc->gfx.esurface = qemu_egl_init_surface_x11(vc->gfx.ectx, x11_window);
  44
  45     assert(vc->gfx.esurface);
  46 }
  47
  48 void gd_egl_draw(VirtualConsole *vc)
  49 {
  50     GdkWindow *window;
  51     int ww, wh;
  52
  53     if (!vc->gfx.gls || !vc->gfx.ds) {
  54         return;
  55     }
  56
  57     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
  58                    vc->gfx.esurface, vc->gfx.ectx);
  59
  60     window = gtk_widget_get_window(vc->gfx.drawing_area);
  61     gdk_drawable_get_size(window, &ww, &wh);
  62     surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, ww, wh);
  63     surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
  64
  65     eglSwapBuffers(qemu_egl_display, vc->gfx.esurface);
  66 }
  67
  68 void gd_egl_update(DisplayChangeListener *dcl,
  69                    int x, int y, int w, int h)
  70 {
  71     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
  72
  73     if (!vc->gfx.gls || !vc->gfx.ds) {
  74         return;
  75     }
  76
  77     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
  78                    vc->gfx.esurface, vc->gfx.ectx);
  79     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
  80     vc->gfx.glupdates++;
  81 }
  82
  83 void gd_egl_refresh(DisplayChangeListener *dcl)
  84 {
  85     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
  86
  87     if (!vc->gfx.esurface) {
  88         gd_egl_init(vc);
  89         if (!vc->gfx.esurface) {
  90             return;
  91         }
  92         vc->gfx.gls = console_gl_init_context();
  93         if (vc->gfx.ds) {
  94             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
  95         }
  96     }
  97
  98     graphic_hw_update(dcl->con);
  99
 100     if (vc->gfx.glupdates) {
 101         vc->gfx.glupdates = 0;
 102         gd_egl_draw(vc);
 103     }
 104 }
 105
 106 void gd_egl_switch(DisplayChangeListener *dcl,
 107                    DisplaySurface *surface)
 108 {
 109     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 110     bool resized = true;
 111
 112     trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
 113
 114     if (vc->gfx.ds &&
 115         surface_width(vc->gfx.ds) == surface_width(surface) &&
 116         surface_height(vc->gfx.ds) == surface_height(surface)) {
 117         resized = false;
 118     }
 119
 120     surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
 121     vc->gfx.ds = surface;
 122     if (vc->gfx.gls) {
 123         surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
 124     }
 125
 126     if (resized) {
 127         gd_update_windowsize(vc);
 128     }
 129 }
 130
 131 void gtk_egl_init(void)
 132 {
 133     GdkDisplay *gdk_display = gdk_display_get_default();
 134     Display *x11_display = gdk_x11_display_get_xdisplay(gdk_display);
 135
 136     if (qemu_egl_init_dpy(x11_display, false, false) < 0) {
 137         return;
 138     }
 139
 140     display_opengl = 1;
 141 }