xref: /openbmc/qemu/ui/egl-helpers.c (revision b91a0fa7) 
1 /*
2  * Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16  */
17 #include "qemu/osdep.h"
18 #include "qemu/drm.h"
19 #include "qemu/error-report.h"
20 #include "ui/console.h"
21 #include "ui/egl-helpers.h"
22 
23 EGLDisplay *qemu_egl_display;
24 EGLConfig qemu_egl_config;
25 DisplayGLMode qemu_egl_mode;
26 
27 /* ------------------------------------------------------------------ */
28 
29 static void egl_fb_delete_texture(egl_fb *fb)
30 {
31     if (!fb->delete_texture) {
32         return;
33     }
34 
35     glDeleteTextures(1, &fb->texture);
36     fb->delete_texture = false;
37 }
38 
39 void egl_fb_destroy(egl_fb *fb)
40 {
41     if (!fb->framebuffer) {
42         return;
43     }
44 
45     egl_fb_delete_texture(fb);
46     glDeleteFramebuffers(1, &fb->framebuffer);
47 
48     fb->width = 0;
49     fb->height = 0;
50     fb->texture = 0;
51     fb->framebuffer = 0;
52 }
53 
54 void egl_fb_setup_default(egl_fb *fb, int width, int height)
55 {
56     fb->width = width;
57     fb->height = height;
58     fb->framebuffer = 0; /* default framebuffer */
59 }
60 
61 void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
62                           GLuint texture, bool delete)
63 {
64     egl_fb_delete_texture(fb);
65 
66     fb->width = width;
67     fb->height = height;
68     fb->texture = texture;
69     fb->delete_texture = delete;
70     if (!fb->framebuffer) {
71         glGenFramebuffers(1, &fb->framebuffer);
72     }
73 
74     glBindFramebuffer(GL_FRAMEBUFFER_EXT, fb->framebuffer);
75     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
76                               GL_TEXTURE_2D, fb->texture, 0);
77 }
78 
79 void egl_fb_setup_new_tex(egl_fb *fb, int width, int height)
80 {
81     GLuint texture;
82 
83     glGenTextures(1, &texture);
84     glBindTexture(GL_TEXTURE_2D, texture);
85     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height,
86                  0, GL_BGRA, GL_UNSIGNED_BYTE, 0);
87 
88     egl_fb_setup_for_tex(fb, width, height, texture, true);
89 }
90 
91 void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip)
92 {
93     GLuint x1 = 0;
94     GLuint y1 = 0;
95     GLuint x2, y2;
96     GLuint w = src->width;
97     GLuint h = src->height;
98 
99     glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
100     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst->framebuffer);
101     glViewport(0, 0, dst->width, dst->height);
102 
103     if (src->dmabuf) {
104         x1 = src->dmabuf->x;
105         y1 = src->dmabuf->y;
106         w = src->dmabuf->scanout_width;
107         h = src->dmabuf->scanout_height;
108     }
109 
110     w = (x1 + w) > src->width ? src->width - x1 : w;
111     h = (y1 + h) > src->height ? src->height - y1 : h;
112 
113     y2 = flip ? y1 : h + y1;
114     y1 = flip ? h + y1 : y1;
115     x2 = x1 + w;
116 
117     glBlitFramebuffer(x1, y1, x2, y2,
118                       0, 0, dst->width, dst->height,
119                       GL_COLOR_BUFFER_BIT, GL_LINEAR);
120 }
121 
122 void egl_fb_read(DisplaySurface *dst, egl_fb *src)
123 {
124     glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
125     glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
126     glReadPixels(0, 0, surface_width(dst), surface_height(dst),
127                  GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst));
128 }
129 
130 void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip)
131 {
132     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
133     glViewport(0, 0, dst->width, dst->height);
134     glEnable(GL_TEXTURE_2D);
135     glBindTexture(GL_TEXTURE_2D, src->texture);
136     qemu_gl_run_texture_blit(gls, flip);
137 }
138 
139 void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,
140                        int x, int y, double scale_x, double scale_y)
141 {
142     glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer);
143     int w = scale_x * src->width;
144     int h = scale_y * src->height;
145     if (flip) {
146         glViewport(x, y, w, h);
147     } else {
148         glViewport(x, dst->height - h - y, w, h);
149     }
150     glEnable(GL_TEXTURE_2D);
151     glBindTexture(GL_TEXTURE_2D, src->texture);
152     glEnable(GL_BLEND);
153     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
154     qemu_gl_run_texture_blit(gls, flip);
155     glDisable(GL_BLEND);
156 }
157 
158 /* ---------------------------------------------------------------------- */
159 
160 #ifdef CONFIG_GBM
161 
162 int qemu_egl_rn_fd;
163 struct gbm_device *qemu_egl_rn_gbm_dev;
164 EGLContext qemu_egl_rn_ctx;
165 
166 int egl_rendernode_init(const char *rendernode, DisplayGLMode mode)
167 {
168     qemu_egl_rn_fd = -1;
169     int rc;
170 
171     qemu_egl_rn_fd = qemu_drm_rendernode_open(rendernode);
172     if (qemu_egl_rn_fd == -1) {
173         error_report("egl: no drm render node available");
174         goto err;
175     }
176 
177     qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
178     if (!qemu_egl_rn_gbm_dev) {
179         error_report("egl: gbm_create_device failed");
180         goto err;
181     }
182 
183     rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev,
184                                 mode);
185     if (rc != 0) {
186         /* qemu_egl_init_dpy_mesa reports error */
187         goto err;
188     }
189 
190     if (!epoxy_has_egl_extension(qemu_egl_display,
191                                  "EGL_KHR_surfaceless_context")) {
192         error_report("egl: EGL_KHR_surfaceless_context not supported");
193         goto err;
194     }
195     if (!epoxy_has_egl_extension(qemu_egl_display,
196                                  "EGL_MESA_image_dma_buf_export")) {
197         error_report("egl: EGL_MESA_image_dma_buf_export not supported");
198         goto err;
199     }
200 
201     qemu_egl_rn_ctx = qemu_egl_init_ctx();
202     if (!qemu_egl_rn_ctx) {
203         error_report("egl: egl_init_ctx failed");
204         goto err;
205     }
206 
207     return 0;
208 
209 err:
210     if (qemu_egl_rn_gbm_dev) {
211         gbm_device_destroy(qemu_egl_rn_gbm_dev);
212     }
213     if (qemu_egl_rn_fd != -1) {
214         close(qemu_egl_rn_fd);
215     }
216 
217     return -1;
218 }
219 
220 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc,
221                            EGLuint64KHR *modifier)
222 {
223     EGLImageKHR image;
224     EGLint num_planes, fd;
225 
226     image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
227                               EGL_GL_TEXTURE_2D_KHR,
228                               (EGLClientBuffer)(unsigned long)tex_id,
229                               NULL);
230     if (!image) {
231         return -1;
232     }
233 
234     eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
235                                   &num_planes, modifier);
236     if (num_planes != 1) {
237         eglDestroyImageKHR(qemu_egl_display, image);
238         return -1;
239     }
240     eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
241     eglDestroyImageKHR(qemu_egl_display, image);
242 
243     return fd;
244 }
245 
246 void egl_dmabuf_import_texture(QemuDmaBuf *dmabuf)
247 {
248     EGLImageKHR image = EGL_NO_IMAGE_KHR;
249     EGLint attrs[64];
250     int i = 0;
251 
252     if (dmabuf->texture != 0) {
253         return;
254     }
255 
256     attrs[i++] = EGL_WIDTH;
257     attrs[i++] = dmabuf->width;
258     attrs[i++] = EGL_HEIGHT;
259     attrs[i++] = dmabuf->height;
260     attrs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
261     attrs[i++] = dmabuf->fourcc;
262 
263     attrs[i++] = EGL_DMA_BUF_PLANE0_FD_EXT;
264     attrs[i++] = dmabuf->fd;
265     attrs[i++] = EGL_DMA_BUF_PLANE0_PITCH_EXT;
266     attrs[i++] = dmabuf->stride;
267     attrs[i++] = EGL_DMA_BUF_PLANE0_OFFSET_EXT;
268     attrs[i++] = 0;
269 #ifdef EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT
270     if (dmabuf->modifier) {
271         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_LO_EXT;
272         attrs[i++] = (dmabuf->modifier >>  0) & 0xffffffff;
273         attrs[i++] = EGL_DMA_BUF_PLANE0_MODIFIER_HI_EXT;
274         attrs[i++] = (dmabuf->modifier >> 32) & 0xffffffff;
275     }
276 #endif
277     attrs[i++] = EGL_NONE;
278 
279     image = eglCreateImageKHR(qemu_egl_display,
280                               EGL_NO_CONTEXT,
281                               EGL_LINUX_DMA_BUF_EXT,
282                               NULL, attrs);
283     if (image == EGL_NO_IMAGE_KHR) {
284         error_report("eglCreateImageKHR failed");
285         return;
286     }
287 
288     glGenTextures(1, &dmabuf->texture);
289     glBindTexture(GL_TEXTURE_2D, dmabuf->texture);
290     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
291     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
292 
293     glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
294     eglDestroyImageKHR(qemu_egl_display, image);
295 }
296 
297 void egl_dmabuf_release_texture(QemuDmaBuf *dmabuf)
298 {
299     if (dmabuf->texture == 0) {
300         return;
301     }
302 
303     glDeleteTextures(1, &dmabuf->texture);
304     dmabuf->texture = 0;
305 }
306 
307 void egl_dmabuf_create_sync(QemuDmaBuf *dmabuf)
308 {
309     EGLSyncKHR sync;
310 
311     if (epoxy_has_egl_extension(qemu_egl_display,
312                                 "EGL_KHR_fence_sync") &&
313         epoxy_has_egl_extension(qemu_egl_display,
314                                 "EGL_ANDROID_native_fence_sync")) {
315         sync = eglCreateSyncKHR(qemu_egl_display,
316                                 EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
317         if (sync != EGL_NO_SYNC_KHR) {
318             dmabuf->sync = sync;
319         }
320     }
321 }
322 
323 void egl_dmabuf_create_fence(QemuDmaBuf *dmabuf)
324 {
325     if (dmabuf->sync) {
326         dmabuf->fence_fd = eglDupNativeFenceFDANDROID(qemu_egl_display,
327                                                       dmabuf->sync);
328         eglDestroySyncKHR(qemu_egl_display, dmabuf->sync);
329         dmabuf->sync = NULL;
330     }
331 }
332 
333 #endif /* CONFIG_GBM */
334 
335 /* ---------------------------------------------------------------------- */
336 
337 EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, EGLNativeWindowType win)
338 {
339     EGLSurface esurface;
340     EGLBoolean b;
341 
342     esurface = eglCreateWindowSurface(qemu_egl_display,
343                                       qemu_egl_config,
344                                       win, NULL);
345     if (esurface == EGL_NO_SURFACE) {
346         error_report("egl: eglCreateWindowSurface failed");
347         return NULL;
348     }
349 
350     b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
351     if (b == EGL_FALSE) {
352         error_report("egl: eglMakeCurrent failed");
353         return NULL;
354     }
355 
356     return esurface;
357 }
358 
359 /* ---------------------------------------------------------------------- */
360 
361 #if defined(CONFIG_X11) || defined(CONFIG_GBM)
362 
363 /*
364  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
365  *
366  * Create an EGLDisplay from a native display type. This is a little quirky
367  * for a few reasons.
368  *
369  * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
370  * use, but have different function signatures in the third argument; this
371  * happens not to matter for us, at the moment, but it means epoxy won't alias
372  * them together.
373  *
374  * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
375  * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
376  * will crash.
377  *
378  * 3: You can't tell whether you have EGL 1.5 at this point, because
379  * eglQueryString(EGL_VERSION) is a property of the display, which we don't
380  * have yet. So you have to query for extensions no matter what. Fortunately
381  * epoxy_has_egl_extension _does_ let you query for client extensions, so
382  * we don't have to write our own extension string parsing.
383  *
384  * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
385  * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
386  * function pointer.
387  * We can workaround this (circular dependency) by probing for the EGL 1.5
388  * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
389  * like mesa will be able to advertise these (even though it can do EGL 1.5).
390  */
391 static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
392                                        EGLenum platform)
393 {
394     EGLDisplay dpy = EGL_NO_DISPLAY;
395 
396     /* In practise any EGL 1.5 implementation would support the EXT extension */
397     if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
398         PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
399             (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
400         if (getPlatformDisplayEXT && platform != 0) {
401             dpy = getPlatformDisplayEXT(platform, native, NULL);
402         }
403     }
404 
405     if (dpy == EGL_NO_DISPLAY) {
406         /* fallback */
407         dpy = eglGetDisplay(native);
408     }
409     return dpy;
410 }
411 
412 static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
413                              EGLenum platform,
414                              DisplayGLMode mode)
415 {
416     static const EGLint conf_att_core[] = {
417         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
418         EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
419         EGL_RED_SIZE,   5,
420         EGL_GREEN_SIZE, 5,
421         EGL_BLUE_SIZE,  5,
422         EGL_ALPHA_SIZE, 0,
423         EGL_NONE,
424     };
425     static const EGLint conf_att_gles[] = {
426         EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
427         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
428         EGL_RED_SIZE,   5,
429         EGL_GREEN_SIZE, 5,
430         EGL_BLUE_SIZE,  5,
431         EGL_ALPHA_SIZE, 0,
432         EGL_NONE,
433     };
434     EGLint major, minor;
435     EGLBoolean b;
436     EGLint n;
437     bool gles = (mode == DISPLAYGL_MODE_ES);
438 
439     qemu_egl_display = qemu_egl_get_display(dpy, platform);
440     if (qemu_egl_display == EGL_NO_DISPLAY) {
441         error_report("egl: eglGetDisplay failed");
442         return -1;
443     }
444 
445     b = eglInitialize(qemu_egl_display, &major, &minor);
446     if (b == EGL_FALSE) {
447         error_report("egl: eglInitialize failed");
448         return -1;
449     }
450 
451     b = eglBindAPI(gles ?  EGL_OPENGL_ES_API : EGL_OPENGL_API);
452     if (b == EGL_FALSE) {
453         error_report("egl: eglBindAPI failed (%s mode)",
454                      gles ? "gles" : "core");
455         return -1;
456     }
457 
458     b = eglChooseConfig(qemu_egl_display,
459                         gles ? conf_att_gles : conf_att_core,
460                         &qemu_egl_config, 1, &n);
461     if (b == EGL_FALSE || n != 1) {
462         error_report("egl: eglChooseConfig failed (%s mode)",
463                      gles ? "gles" : "core");
464         return -1;
465     }
466 
467     qemu_egl_mode = gles ? DISPLAYGL_MODE_ES : DISPLAYGL_MODE_CORE;
468     return 0;
469 }
470 
471 int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
472 {
473 #ifdef EGL_KHR_platform_x11
474     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR, mode);
475 #else
476     return qemu_egl_init_dpy(dpy, 0, mode);
477 #endif
478 }
479 
480 int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
481 {
482 #ifdef EGL_MESA_platform_gbm
483     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
484 #else
485     return qemu_egl_init_dpy(dpy, 0, mode);
486 #endif
487 }
488 
489 #endif
490 
491 bool qemu_egl_has_dmabuf(void)
492 {
493     if (qemu_egl_display == EGL_NO_DISPLAY) {
494         return false;
495     }
496 
497     return epoxy_has_egl_extension(qemu_egl_display,
498                                    "EGL_EXT_image_dma_buf_import");
499 }
500 
501 EGLContext qemu_egl_init_ctx(void)
502 {
503     static const EGLint ctx_att_core[] = {
504         EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
505         EGL_NONE
506     };
507     static const EGLint ctx_att_gles[] = {
508         EGL_CONTEXT_CLIENT_VERSION, 2,
509         EGL_NONE
510     };
511     bool gles = (qemu_egl_mode == DISPLAYGL_MODE_ES);
512     EGLContext ectx;
513     EGLBoolean b;
514 
515     ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
516                             gles ? ctx_att_gles : ctx_att_core);
517     if (ectx == EGL_NO_CONTEXT) {
518         error_report("egl: eglCreateContext failed");
519         return NULL;
520     }
521 
522     b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
523     if (b == EGL_FALSE) {
524         error_report("egl: eglMakeCurrent failed");
525         return NULL;
526     }
527 
528     return ectx;
529 }
530