summaryrefslogtreecommitdiff
path: root/ui/egl-helpers.c
blob: b7b6b2e3cc71e3601d7447610af201a8d3dc12a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
 * Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include "qemu/osdep.h"
#include <glob.h>
#include <dirent.h>

#include "qemu/error-report.h"
#include "ui/egl-helpers.h"

EGLDisplay *qemu_egl_display;
EGLConfig qemu_egl_config;

/* ---------------------------------------------------------------------- */

static bool egl_gles;
static int egl_debug;

#define egl_dbg(_x ...)                          \
    do {                                         \
        if (egl_debug) {                         \
            fprintf(stderr, "egl: " _x);         \
        }                                        \
    } while (0);

/* ---------------------------------------------------------------------- */

#ifdef CONFIG_OPENGL_DMABUF

int qemu_egl_rn_fd;
struct gbm_device *qemu_egl_rn_gbm_dev;
EGLContext qemu_egl_rn_ctx;

static int qemu_egl_rendernode_open(const char *rendernode)
{
    DIR *dir;
    struct dirent *e;
    int r, fd;
    char *p;

    if (rendernode) {
        return open(rendernode, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
    }

    dir = opendir("/dev/dri");
    if (!dir) {
        return -1;
    }

    fd = -1;
    while ((e = readdir(dir))) {
        if (e->d_type != DT_CHR) {
            continue;
        }

        if (strncmp(e->d_name, "renderD", 7)) {
            continue;
        }

        p = g_strdup_printf("/dev/dri/%s", e->d_name);

        r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
        if (r < 0) {
            g_free(p);
            continue;
        }
        fd = r;
        g_free(p);
        break;
    }

    closedir(dir);
    if (fd < 0) {
        return -1;
    }
    return fd;
}

int egl_rendernode_init(const char *rendernode)
{
    qemu_egl_rn_fd = -1;

    qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
    if (qemu_egl_rn_fd == -1) {
        error_report("egl: no drm render node available");
        goto err;
    }

    qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
    if (!qemu_egl_rn_gbm_dev) {
        error_report("egl: gbm_create_device failed");
        goto err;
    }

    qemu_egl_init_dpy((EGLNativeDisplayType)qemu_egl_rn_gbm_dev, false, false);

    if (!epoxy_has_egl_extension(qemu_egl_display,
                                 "EGL_KHR_surfaceless_context")) {
        error_report("egl: EGL_KHR_surfaceless_context not supported");
        goto err;
    }
    if (!epoxy_has_egl_extension(qemu_egl_display,
                                 "EGL_MESA_image_dma_buf_export")) {
        error_report("egl: EGL_MESA_image_dma_buf_export not supported");
        goto err;
    }

    qemu_egl_rn_ctx = qemu_egl_init_ctx();
    if (!qemu_egl_rn_ctx) {
        error_report("egl: egl_init_ctx failed");
        goto err;
    }

    return 0;

err:
    if (qemu_egl_rn_gbm_dev) {
        gbm_device_destroy(qemu_egl_rn_gbm_dev);
    }
    if (qemu_egl_rn_fd != -1) {
        close(qemu_egl_rn_fd);
    }

    return -1;
}

int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc)
{
    EGLImageKHR image;
    EGLint num_planes, fd;

    image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
                              EGL_GL_TEXTURE_2D_KHR,
                              (EGLClientBuffer)(unsigned long)tex_id,
                              NULL);
    if (!image) {
        return -1;
    }

    eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
                                  &num_planes, NULL);
    if (num_planes != 1) {
        eglDestroyImageKHR(qemu_egl_display, image);
        return -1;
    }
    eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
    eglDestroyImageKHR(qemu_egl_display, image);

    return fd;
}

#endif /* CONFIG_OPENGL_DMABUF */

/* ---------------------------------------------------------------------- */

EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
{
    EGLSurface esurface;
    EGLBoolean b;

    egl_dbg("eglCreateWindowSurface (x11 win id 0x%lx) ...\n",
            (unsigned long) win);
    esurface = eglCreateWindowSurface(qemu_egl_display,
                                      qemu_egl_config,
                                      (EGLNativeWindowType)win, NULL);
    if (esurface == EGL_NO_SURFACE) {
        error_report("egl: eglCreateWindowSurface failed");
        return NULL;
    }

    b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
    if (b == EGL_FALSE) {
        error_report("egl: eglMakeCurrent failed");
        return NULL;
    }

    return esurface;
}

/* ---------------------------------------------------------------------- */

/*
 * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
 *
 * Create an EGLDisplay from a native display type. This is a little quirky
 * for a few reasons.
 *
 * 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
 * use, but have different function signatures in the third argument; this
 * happens not to matter for us, at the moment, but it means epoxy won't alias
 * them together.
 *
 * 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
 * means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
 * will crash.
 *
 * 3: You can't tell whether you have EGL 1.5 at this point, because
 * eglQueryString(EGL_VERSION) is a property of the display, which we don't
 * have yet. So you have to query for extensions no matter what. Fortunately
 * epoxy_has_egl_extension _does_ let you query for client extensions, so
 * we don't have to write our own extension string parsing.
 *
 * 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
 * needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
 * function pointer.
 * We can workaround this (circular dependency) by probing for the EGL 1.5
 * platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
 * like mesa will be able to advertise these (even though it can do EGL 1.5).
 */
static EGLDisplay qemu_egl_get_display(void *native)
{
    EGLDisplay dpy = EGL_NO_DISPLAY;

#ifdef EGL_MESA_platform_gbm
    /* In practise any EGL 1.5 implementation would support the EXT extension */
    if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
        PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
            (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
        if (getPlatformDisplayEXT) {
            dpy = getPlatformDisplayEXT(EGL_PLATFORM_GBM_MESA, native, NULL);
        }
    }
#endif

    if (dpy == EGL_NO_DISPLAY) {
        /* fallback */
        dpy = eglGetDisplay(native);
    }
    return dpy;
}

int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug)
{
    static const EGLint conf_att_gl[] = {
        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
        EGL_RED_SIZE,   5,
        EGL_GREEN_SIZE, 5,
        EGL_BLUE_SIZE,  5,
        EGL_ALPHA_SIZE, 0,
        EGL_NONE,
    };
    static const EGLint conf_att_gles[] = {
        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_RED_SIZE,   5,
        EGL_GREEN_SIZE, 5,
        EGL_BLUE_SIZE,  5,
        EGL_ALPHA_SIZE, 0,
        EGL_NONE,
    };
    EGLint major, minor;
    EGLBoolean b;
    EGLint n;

    if (debug) {
        egl_debug = 1;
        setenv("EGL_LOG_LEVEL", "debug", true);
        setenv("LIBGL_DEBUG", "verbose", true);
    }

    egl_dbg("qemu_egl_get_display (dpy %p) ...\n", dpy);
    qemu_egl_display = qemu_egl_get_display(dpy);
    if (qemu_egl_display == EGL_NO_DISPLAY) {
        error_report("egl: eglGetDisplay failed");
        return -1;
    }

    egl_dbg("eglInitialize ...\n");
    b = eglInitialize(qemu_egl_display, &major, &minor);
    if (b == EGL_FALSE) {
        error_report("egl: eglInitialize failed");
        return -1;
    }

    egl_dbg("eglBindAPI ...\n");
    b = eglBindAPI(gles ? EGL_OPENGL_ES_API : EGL_OPENGL_API);
    if (b == EGL_FALSE) {
        error_report("egl: eglBindAPI failed");
        return -1;
    }

    egl_dbg("eglChooseConfig ...\n");
    b = eglChooseConfig(qemu_egl_display,
                        gles ? conf_att_gles : conf_att_gl,
                        &qemu_egl_config, 1, &n);
    if (b == EGL_FALSE || n != 1) {
        error_report("egl: eglChooseConfig failed");
        return -1;
    }

    egl_gles = gles;
    return 0;
}

EGLContext qemu_egl_init_ctx(void)
{
    static const EGLint ctx_att_gl[] = {
        EGL_NONE
    };
    static const EGLint ctx_att_gles[] = {
        EGL_CONTEXT_CLIENT_VERSION, 2,
        EGL_NONE
    };

    EGLContext ectx;
    EGLBoolean b;

    egl_dbg("eglCreateContext ...\n");
    ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
                            egl_gles ? ctx_att_gles : ctx_att_gl);
    if (ectx == EGL_NO_CONTEXT) {
        error_report("egl: eglCreateContext failed");
        return NULL;
    }

    b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
    if (b == EGL_FALSE) {
        error_report("egl: eglMakeCurrent failed");
        return NULL;
    }

    return ectx;
}