xref: /qemu/ui/gtk-gl-area.c (revision b2a3cbb8) 
1 /*
2  * GTK UI -- glarea opengl code.
3  *
4  * Requires 3.16+ (GtkGLArea widget).
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
7  * See the COPYING file in the top-level directory.
8  */
9 
10 #include "qemu/osdep.h"
11 #include "qemu/main-loop.h"
12 
13 #include "trace.h"
14 
15 #include "ui/console.h"
16 #include "ui/gtk.h"
17 #include "ui/egl-helpers.h"
18 
19 #include "sysemu/sysemu.h"
20 
21 static void gtk_gl_area_set_scanout_mode(VirtualConsole *vc, bool scanout)
22 {
23     if (vc->gfx.scanout_mode == scanout) {
24         return;
25     }
26 
27     vc->gfx.scanout_mode = scanout;
28     if (!vc->gfx.scanout_mode) {
29         egl_fb_destroy(&vc->gfx.guest_fb);
30         if (vc->gfx.surface) {
31             surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
32             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
33         }
34     }
35 }
36 
37 /** DisplayState Callbacks (opengl version) **/
38 
39 void gd_gl_area_draw(VirtualConsole *vc)
40 {
41 #ifdef CONFIG_GBM
42     QemuDmaBuf *dmabuf = vc->gfx.guest_fb.dmabuf;
43 #endif
44     int ww, wh, ws, y1, y2;
45 
46     if (!vc->gfx.gls) {
47         return;
48     }
49 
50     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
51     ws = gdk_window_get_scale_factor(gtk_widget_get_window(vc->gfx.drawing_area));
52     ww = gtk_widget_get_allocated_width(vc->gfx.drawing_area) * ws;
53     wh = gtk_widget_get_allocated_height(vc->gfx.drawing_area) * ws;
54 
55     if (vc->gfx.scanout_mode) {
56         if (!vc->gfx.guest_fb.framebuffer) {
57             return;
58         }
59 
60 #ifdef CONFIG_GBM
61         if (dmabuf) {
62             if (!dmabuf->draw_submitted) {
63                 return;
64             } else {
65                 dmabuf->draw_submitted = false;
66             }
67         }
68 #endif
69 
70         glBindFramebuffer(GL_READ_FRAMEBUFFER, vc->gfx.guest_fb.framebuffer);
71         /* GtkGLArea sets GL_DRAW_FRAMEBUFFER for us */
72 
73         glViewport(0, 0, ww, wh);
74         y1 = vc->gfx.y0_top ? 0 : vc->gfx.h;
75         y2 = vc->gfx.y0_top ? vc->gfx.h : 0;
76         glBlitFramebuffer(0, y1, vc->gfx.w, y2,
77                           0, 0, ww, wh,
78                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
79 #ifdef CONFIG_GBM
80         if (dmabuf) {
81             egl_dmabuf_create_sync(dmabuf);
82         }
83 #endif
84         glFlush();
85 #ifdef CONFIG_GBM
86         if (dmabuf) {
87             egl_dmabuf_create_fence(dmabuf);
88             if (dmabuf->fence_fd > 0) {
89                 qemu_set_fd_handler(dmabuf->fence_fd, gd_hw_gl_flushed, NULL, vc);
90                 return;
91             }
92             graphic_hw_gl_block(vc->gfx.dcl.con, false);
93         }
94 #endif
95     } else {
96         if (!vc->gfx.ds) {
97             return;
98         }
99         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
100 
101         surface_gl_setup_viewport(vc->gfx.gls, vc->gfx.ds, ww, wh);
102         surface_gl_render_texture(vc->gfx.gls, vc->gfx.ds);
103     }
104 }
105 
106 void gd_gl_area_update(DisplayChangeListener *dcl,
107                    int x, int y, int w, int h)
108 {
109     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
110 
111     if (!vc->gfx.gls || !vc->gfx.ds) {
112         return;
113     }
114 
115     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
116     surface_gl_update_texture(vc->gfx.gls, vc->gfx.ds, x, y, w, h);
117     vc->gfx.glupdates++;
118 }
119 
120 void gd_gl_area_refresh(DisplayChangeListener *dcl)
121 {
122     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
123 
124     gd_update_monitor_refresh_rate(vc, vc->window ? vc->window : vc->gfx.drawing_area);
125 
126     if (!vc->gfx.gls) {
127         if (!gtk_widget_get_realized(vc->gfx.drawing_area)) {
128             return;
129         }
130         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
131         vc->gfx.gls = qemu_gl_init_shader();
132         if (vc->gfx.ds) {
133             surface_gl_create_texture(vc->gfx.gls, vc->gfx.ds);
134         }
135     }
136 
137     graphic_hw_update(dcl->con);
138 
139     if (vc->gfx.glupdates) {
140         vc->gfx.glupdates = 0;
141         gtk_gl_area_set_scanout_mode(vc, false);
142         gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
143     }
144 }
145 
146 void gd_gl_area_switch(DisplayChangeListener *dcl,
147                        DisplaySurface *surface)
148 {
149     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
150     bool resized = true;
151 
152     trace_gd_switch(vc->label, surface_width(surface), surface_height(surface));
153 
154     if (vc->gfx.ds &&
155         surface_width(vc->gfx.ds) == surface_width(surface) &&
156         surface_height(vc->gfx.ds) == surface_height(surface)) {
157         resized = false;
158     }
159 
160     if (vc->gfx.gls) {
161         gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
162         surface_gl_destroy_texture(vc->gfx.gls, vc->gfx.ds);
163         surface_gl_create_texture(vc->gfx.gls, surface);
164     }
165     vc->gfx.ds = surface;
166 
167     if (resized) {
168         gd_update_windowsize(vc);
169     }
170 }
171 
172 static int gd_cmp_gl_context_version(int major, int minor, QEMUGLParams *params)
173 {
174     if (major > params->major_ver) {
175         return 1;
176     }
177     if (major < params->major_ver) {
178         return -1;
179     }
180     if (minor > params->minor_ver) {
181         return 1;
182     }
183     if (minor < params->minor_ver) {
184         return -1;
185     }
186     return 0;
187 }
188 
189 QEMUGLContext gd_gl_area_create_context(DisplayGLCtx *dgc,
190                                         QEMUGLParams *params)
191 {
192     VirtualConsole *vc = container_of(dgc, VirtualConsole, gfx.dgc);
193     GdkWindow *window;
194     GdkGLContext *ctx;
195     GError *err = NULL;
196     int major, minor;
197 
198     window = gtk_widget_get_window(vc->gfx.drawing_area);
199     ctx = gdk_window_create_gl_context(window, &err);
200     if (err) {
201         g_printerr("Create gdk gl context failed: %s\n", err->message);
202         g_error_free(err);
203         return NULL;
204     }
205     gdk_gl_context_set_required_version(ctx,
206                                         params->major_ver,
207                                         params->minor_ver);
208     gdk_gl_context_realize(ctx, &err);
209     if (err) {
210         g_printerr("Realize gdk gl context failed: %s\n", err->message);
211         g_error_free(err);
212         g_clear_object(&ctx);
213         return NULL;
214     }
215 
216     gdk_gl_context_make_current(ctx);
217     gdk_gl_context_get_version(ctx, &major, &minor);
218     gdk_gl_context_clear_current();
219     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
220 
221     if (gd_cmp_gl_context_version(major, minor, params) == -1) {
222         /* created ctx version < requested version */
223         g_clear_object(&ctx);
224     }
225 
226     trace_gd_gl_area_create_context(ctx, params->major_ver, params->minor_ver);
227     return ctx;
228 }
229 
230 void gd_gl_area_destroy_context(DisplayGLCtx *dgc, QEMUGLContext ctx)
231 {
232     GdkGLContext *current_ctx = gdk_gl_context_get_current();
233 
234     trace_gd_gl_area_destroy_context(ctx, current_ctx);
235     if (ctx == current_ctx) {
236         gdk_gl_context_clear_current();
237     }
238     g_clear_object(&ctx);
239 }
240 
241 void gd_gl_area_scanout_texture(DisplayChangeListener *dcl,
242                                 uint32_t backing_id,
243                                 bool backing_y_0_top,
244                                 uint32_t backing_width,
245                                 uint32_t backing_height,
246                                 uint32_t x, uint32_t y,
247                                 uint32_t w, uint32_t h)
248 {
249     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
250 
251     vc->gfx.x = x;
252     vc->gfx.y = y;
253     vc->gfx.w = w;
254     vc->gfx.h = h;
255     vc->gfx.y0_top = backing_y_0_top;
256 
257     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
258 
259     if (backing_id == 0 || vc->gfx.w == 0 || vc->gfx.h == 0) {
260         gtk_gl_area_set_scanout_mode(vc, false);
261         return;
262     }
263 
264     gtk_gl_area_set_scanout_mode(vc, true);
265     egl_fb_setup_for_tex(&vc->gfx.guest_fb, backing_width, backing_height,
266                          backing_id, false);
267 }
268 
269 void gd_gl_area_scanout_disable(DisplayChangeListener *dcl)
270 {
271     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
272 
273     gtk_gl_area_set_scanout_mode(vc, false);
274 }
275 
276 void gd_gl_area_scanout_flush(DisplayChangeListener *dcl,
277                           uint32_t x, uint32_t y, uint32_t w, uint32_t h)
278 {
279     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
280 
281     if (vc->gfx.guest_fb.dmabuf) {
282         graphic_hw_gl_block(vc->gfx.dcl.con, true);
283         vc->gfx.guest_fb.dmabuf->draw_submitted = true;
284     }
285     gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
286 }
287 
288 void gd_gl_area_scanout_dmabuf(DisplayChangeListener *dcl,
289                                QemuDmaBuf *dmabuf)
290 {
291 #ifdef CONFIG_GBM
292     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
293 
294     gtk_gl_area_make_current(GTK_GL_AREA(vc->gfx.drawing_area));
295     egl_dmabuf_import_texture(dmabuf);
296     if (!dmabuf->texture) {
297         return;
298     }
299 
300     gd_gl_area_scanout_texture(dcl, dmabuf->texture,
301                                false, dmabuf->width, dmabuf->height,
302                                0, 0, dmabuf->width, dmabuf->height);
303 
304     if (dmabuf->allow_fences) {
305         vc->gfx.guest_fb.dmabuf = dmabuf;
306     }
307 #endif
308 }
309 
310 void gtk_gl_area_init(void)
311 {
312     display_opengl = 1;
313 }
314 
315 int gd_gl_area_make_current(DisplayGLCtx *dgc,
316                             QEMUGLContext ctx)
317 {
318     gdk_gl_context_make_current(ctx);
319     return 0;
320 }
321