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_disable(DisplayChangeListener *dcl)
 174 {
 175     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 176
 177     vc->gfx.w = 0;
 178     vc->gfx.h = 0;
 179     vc->gfx.tex_id = 0;
 180     gtk_egl_set_scanout_mode(vc, false);
 181 }
 182
 183 void gd_egl_scanout_texture(DisplayChangeListener *dcl,
 184                             uint32_t backing_id, bool backing_y_0_top,
 185                             uint32_t backing_width, uint32_t backing_height,
 186                             uint32_t x, uint32_t y,
 187                             uint32_t w, uint32_t h)
 188 {
 189     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 190
 191     vc->gfx.x = x;
 192     vc->gfx.y = y;
 193     vc->gfx.w = w;
 194     vc->gfx.h = h;
 195     vc->gfx.tex_id = backing_id;
 196     vc->gfx.y0_top = backing_y_0_top;
 197
 198     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 199                    vc->gfx.esurface, vc->gfx.ectx);
 200
 201     gtk_egl_set_scanout_mode(vc, true);
 202     if (!vc->gfx.fbo_id) {
 203         glGenFramebuffers(1, &vc->gfx.fbo_id);
 204     }
 205
 206     glBindFramebuffer(GL_FRAMEBUFFER_EXT, vc->gfx.fbo_id);
 207     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
 208                               GL_TEXTURE_2D, vc->gfx.tex_id, 0);
 209 }
 210
 211 void gd_egl_scanout_flush(DisplayChangeListener *dcl,
 212                           uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 213 {
 214     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 215     GdkWindow *window;
 216     int ww, wh, y1, y2;
 217
 218     if (!vc->gfx.scanout_mode) {
 219         return;
 220     }
 221     if (!vc->gfx.fbo_id) {
 222         return;
 223     }
 224
 225     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 226                    vc->gfx.esurface, vc->gfx.ectx);
 227
 228     glBindFramebuffer(GL_READ_FRAMEBUFFER, vc->gfx.fbo_id);
 229     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 230
 231     window = gtk_widget_get_window(vc->gfx.drawing_area);
 232     gdk_drawable_get_size(window, &ww, &wh);
 233     glViewport(0, 0, ww, wh);
 234     y1 = vc->gfx.y0_top ? 0 : vc->gfx.h;
 235     y2 = vc->gfx.y0_top ? vc->gfx.h : 0;
 236     glBlitFramebuffer(0, y1, vc->gfx.w, y2,
 237                       0, 0, ww, wh,
 238                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 239     glBindFramebuffer(GL_FRAMEBUFFER_EXT, vc->gfx.fbo_id);
 240
 241     eglSwapBuffers(qemu_egl_display, vc->gfx.esurface);
 242 }
 243
 244 void gtk_egl_init(void)
 245 {
 246     GdkDisplay *gdk_display = gdk_display_get_default();
 247     Display *x11_display = gdk_x11_display_get_xdisplay(gdk_display);
 248
 249     if (qemu_egl_init_dpy_x11(x11_display) < 0) {
 250         return;
 251     }
 252
 253     display_opengl = 1;
 254 }
 255
 256 int gd_egl_make_current(DisplayChangeListener *dcl,
 257                         QEMUGLContext ctx)
 258 {
 259     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 260
 261     return eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
 262                           vc->gfx.esurface, ctx);
 263 }