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