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/osdep.h"
  15 #include "qemu-common.h"
  16
  17 #include "trace.h"
  18
  19 #include "ui/console.h"
  20 #include "ui/gtk.h"
  21 #include "ui/egl-helpers.h"
  22
  23 #include "sysemu/sysemu.h"
  24
  25 static void gtk_egl_set_scanout_mode(VirtualConsole *vc, bool scanout)
  26 {
  27     if (vc->gfx.scanout_mode == scanout) {
  28         return;
  29     }
  30
  31     vc->gfx.scanout_mode = scanout;
  32     if (!vc->gfx.scanout_mode) {
  33         if (vc->gfx.fbo_id) {
  34             glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  35                                       GL_COLOR_ATTACHMENT0_EXT,
  36                                       GL_TEXTURE_2D, 0, 0);
  37             glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
  38             glDeleteFramebuffers(1, &vc->gfx.fbo_id);
  39             vc->gfx.fbo_id = 0;
  40         }
  41         if (vc->gfx.surface) {
  42             surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
  43             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
  44         }
  45     }
  46 }
  47
  48 /** DisplayState Callbacks (opengl version) **/
  49
  50 void gd_egl_init(VirtualConsole *vc)
  51 {
  52     GdkWindow *gdk_window = gtk_widget_get_window(vc->gfx.drawing_area);
  53     if (!gdk_window) {
  54         return;
  55     }
  56
  57 #if GTK_CHECK_VERSION(3, 0, 0)
  58     Window x11_window = gdk_x11_window_get_xid(gdk_window);
  59 #else
  60     Window x11_window = gdk_x11_drawable_get_xid(gdk_window);
  61 #endif
  62     if (!x11_window) {
  63         return;
  64     }
  65
  66     vc->gfx.ectx = qemu_egl_init_ctx();
  67     vc->gfx.esurface = qemu_egl_init_surface_x11(vc->gfx.ectx, x11_window);
  68
  69     assert(vc->gfx.esurface);
  70 }
  71
  72 void gd_egl_draw(VirtualConsole *vc)
  73 {
  74     GdkWindow *window;
  75     int ww, wh;
  76
  77     if (!vc->gfx.gls) {
  78         return;
  79     }
  80
  81     if (vc->gfx.scanout_mode) {
  82         gd_egl_scanout_flush(&vc->gfx.dcl, 0, 0, vc->gfx.w, vc->gfx.h);
  83     } else {
  84         if (!vc->gfx.ds) {
  85             return;
  86         }
  87         eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
  88                        vc->gfx.esurface, vc->gfx.ectx);
  89
  90         window = gtk_widget_get_window(vc->gfx.drawing_area);
  91         gdk_drawable_get_size(window, &ww, &wh);
  92         surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, ww, wh);
  93         surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
  94
  95         eglSwapBuffers(qemu_egl_display, vc->gfx.esurface);
  96     }
  97 }
  98
  99 void gd_egl_update(DisplayChangeListener *dcl,
 100                    int x, int y, int w, int h)
 101 {
 102     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 103
 104     if (!vc->gfx.gls || !vc->gfx.ds) {
 105         return;
 106     }
 107
 108     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 109                    vc->gfx.esurface, vc->gfx.ectx);
 110     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
 111     vc->gfx.glupdates++;
 112 }
 113
 114 void gd_egl_refresh(DisplayChangeListener *dcl)
 115 {
 116     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 117
 118     if (!vc->gfx.esurface) {
 119         gd_egl_init(vc);
 120         if (!vc->gfx.esurface) {
 121             return;
 122         }
 123         vc->gfx.gls = console_gl_init_context();
 124         if (vc->gfx.ds) {
 125             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
 126         }
 127     }
 128
 129     graphic_hw_update(dcl->con);
 130
 131     if (vc->gfx.glupdates) {
 132         vc->gfx.glupdates = 0;
 133         gtk_egl_set_scanout_mode(vc, false);
 134         gd_egl_draw(vc);
 135     }
 136 }
 137
 138 void gd_egl_switch(DisplayChangeListener *dcl,
 139                    DisplaySurface *surface)
 140 {
 141     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 142     bool resized = true;
 143
 144     trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
 145
 146     if (vc->gfx.ds &&
 147         surface_width(vc->gfx.ds) == surface_width(surface) &&
 148         surface_height(vc->gfx.ds) == surface_height(surface)) {
 149         resized = false;
 150     }
 151
 152     surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
 153     vc->gfx.ds = surface;
 154     if (vc->gfx.gls) {
 155         surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
 156     }
 157
 158     if (resized) {
 159         gd_update_windowsize(vc);
 160     }
 161 }
 162
 163 QEMUGLContext gd_egl_create_context(DisplayChangeListener *dcl,
 164                                     QEMUGLParams *params)
 165 {
 166     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 167
 168     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 169                    vc->gfx.esurface, vc->gfx.ectx);
 170     return qemu_egl_create_context(dcl, params);
 171 }
 172
 173 void gd_egl_scanout(DisplayChangeListener *dcl,
 174                     uint32_t backing_id, bool backing_y_0_top,
 175                     uint32_t x, uint32_t y,
 176                     uint32_t w, uint32_t h)
 177 {
 178     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 179
 180     vc->gfx.x = x;
 181     vc->gfx.y = y;
 182     vc->gfx.w = w;
 183     vc->gfx.h = h;
 184     vc->gfx.tex_id = backing_id;
 185     vc->gfx.y0_top = backing_y_0_top;
 186
 187     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 188                    vc->gfx.esurface, vc->gfx.ectx);
 189
 190     if (vc->gfx.tex_id == 0 || vc->gfx.w == 0 || vc->gfx.h == 0) {
 191         gtk_egl_set_scanout_mode(vc, false);
 192         return;
 193     }
 194
 195     gtk_egl_set_scanout_mode(vc, true);
 196     if (!vc->gfx.fbo_id) {
 197         glGenFramebuffers(1, &vc->gfx.fbo_id);
 198     }
 199
 200     glBindFramebuffer(GL_FRAMEBUFFER_EXT, vc->gfx.fbo_id);
 201     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
 202                               GL_TEXTURE_2D, vc->gfx.tex_id, 0);
 203 }
 204
 205 void gd_egl_scanout_flush(DisplayChangeListener *dcl,
 206                           uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 207 {
 208     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 209     GdkWindow *window;
 210     int ww, wh, y1, y2;
 211
 212     if (!vc->gfx.scanout_mode) {
 213         return;
 214     }
 215     if (!vc->gfx.fbo_id) {
 216         return;
 217     }
 218
 219     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 220                    vc->gfx.esurface, vc->gfx.ectx);
 221
 222     glBindFramebuffer(GL_READ_FRAMEBUFFER, vc->gfx.fbo_id);
 223     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 224
 225     window = gtk_widget_get_window(vc->gfx.drawing_area);
 226     gdk_drawable_get_size(window, &ww, &wh);
 227     glViewport(0, 0, ww, wh);
 228     y1 = vc->gfx.y0_top ? 0 : vc->gfx.h;
 229     y2 = vc->gfx.y0_top ? vc->gfx.h : 0;
 230     glBlitFramebuffer(0, y1, vc->gfx.w, y2,
 231                       0, 0, ww, wh,
 232                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 233     glBindFramebuffer(GL_FRAMEBUFFER_EXT, vc->gfx.fbo_id);
 234
 235     eglSwapBuffers(qemu_egl_display, vc->gfx.esurface);
 236 }
 237
 238 void gtk_egl_init(void)
 239 {
 240     GdkDisplay *gdk_display = gdk_display_get_default();
 241     Display *x11_display = gdk_x11_display_get_xdisplay(gdk_display);
 242
 243     if (qemu_egl_init_dpy(x11_display, false, false) < 0) {
 244         return;
 245     }
 246
 247     display_opengl = 1;
 248 }
 249
 250 int gd_egl_make_current(DisplayChangeListener *dcl,
 251                         QEMUGLContext ctx)
 252 {
 253     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 254
 255     return eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 256                           vc->gfx.esurface, ctx);
 257 }