[qemu.git] / ui / egl-helpers.c

/*
 * Copyright (C) 2015-2016 Gerd Hoffmann <[email protected]>
 *
 * 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;

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

#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;
    int rc;

    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;
    }

    rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev);
    if (rc != 0) {
        /* qemu_egl_init_dpy_mesa reports error */
        goto err;
    }

    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;

    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(EGLNativeDisplayType native,
                                       EGLenum platform)
{
    EGLDisplay dpy = EGL_NO_DISPLAY;

    /* 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 && platform != 0) {
            dpy = getPlatformDisplayEXT(platform, native, NULL);
        }
    }

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

static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
                             EGLenum platform)
{
    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,
    };
    EGLint major, minor;
    EGLBoolean b;
    EGLint n;

    qemu_egl_display = qemu_egl_get_display(dpy, platform);
    if (qemu_egl_display == EGL_NO_DISPLAY) {
        error_report("egl: eglGetDisplay failed");
        return -1;
    }

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

    b = eglBindAPI(EGL_OPENGL_API);
    if (b == EGL_FALSE) {
        error_report("egl: eglBindAPI failed");
        return -1;
    }

    b = eglChooseConfig(qemu_egl_display, conf_att_gl,
                        &qemu_egl_config, 1, &n);
    if (b == EGL_FALSE || n != 1) {
        error_report("egl: eglChooseConfig failed");
        return -1;
    }
    return 0;
}

int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy)
{
#ifdef EGL_KHR_platform_x11
    return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR);
#else
    return qemu_egl_init_dpy(dpy, 0);
#endif
}

int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy)
{
#ifdef EGL_MESA_platform_gbm
    return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA);
#else
    return qemu_egl_init_dpy(dpy, 0);
#endif
}

EGLContext qemu_egl_init_ctx(void)
{
    static const EGLint ctx_att_gl[] = {
        EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
        EGL_NONE
    };
    EGLContext ectx;
    EGLBoolean b;

    ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
                            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;
}
Commit	Line	Data
6250dff3 FZ	1	/*
	2	* Copyright (C) 2015-2016 Gerd Hoffmann <[email protected]>
	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	*/
e16f4c87	17	#include "qemu/osdep.h"
7ced9e9f	18	#include <glob.h>
1e316598	19	#include <dirent.h>
7ced9e9f	20
38a55bdd	21	#include "qemu/error-report.h"
7ced9e9f GH	22	#include "ui/egl-helpers.h"
	23
	24	EGLDisplay *qemu_egl_display;
	25	EGLConfig qemu_egl_config;
	26
	27	/* ---------------------------------------------------------------------- */
	28
1e316598 GH	29	#ifdef CONFIG_OPENGL_DMABUF
	30
	31	int qemu_egl_rn_fd;
	32	struct gbm_device *qemu_egl_rn_gbm_dev;
	33	EGLContext qemu_egl_rn_ctx;
	34
7b525508	35	static int qemu_egl_rendernode_open(const char *rendernode)
1e316598 GH	36	{
	37	DIR *dir;
	38	struct dirent *e;
	39	int r, fd;
	40	char *p;
	41
7b525508 MAL	42	if (rendernode) {
	43	return open(rendernode, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	44	}
	45
1e316598 GH	46	dir = opendir("/dev/dri");
	47	if (!dir) {
	48	return -1;
	49	}
	50
	51	fd = -1;
	52	while ((e = readdir(dir))) {
	53	if (e->d_type != DT_CHR) {
	54	continue;
	55	}
	56
	57	if (strncmp(e->d_name, "renderD", 7)) {
	58	continue;
	59	}
	60
f454f49c	61	p = g_strdup_printf("/dev/dri/%s", e->d_name);
1e316598 GH	62
	63	r = open(p, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	64	if (r < 0) {
f454f49c	65	g_free(p);
1e316598 GH	66	continue;
	67	}
	68	fd = r;
f454f49c	69	g_free(p);
1e316598 GH	70	break;
	71	}
	72
	73	closedir(dir);
	74	if (fd < 0) {
	75	return -1;
	76	}
	77	return fd;
	78	}
	79
7b525508	80	int egl_rendernode_init(const char *rendernode)
1e316598 GH	81	{
1e316598 GH	82	qemu_egl_rn_fd = -1;
151c8e60	83	int rc;
1e316598	84
7b525508	85	qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
1e316598	86	if (qemu_egl_rn_fd == -1) {
38a55bdd	87	error_report("egl: no drm render node available");
1e316598 GH	88	goto err;
	89	}
	90
	91	qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
	92	if (!qemu_egl_rn_gbm_dev) {
38a55bdd	93	error_report("egl: gbm_create_device failed");
1e316598 GH	94	goto err;
	95	}
	96
151c8e60 GH	97	rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev);
	98	if (rc != 0) {
	99	/* qemu_egl_init_dpy_mesa reports error */
	100	goto err;
	101	}
1e316598 GH	102
	103	if (!epoxy_has_egl_extension(qemu_egl_display,
	104	"EGL_KHR_surfaceless_context")) {
38a55bdd	105	error_report("egl: EGL_KHR_surfaceless_context not supported");
1e316598 GH	106	goto err;
	107	}
	108	if (!epoxy_has_egl_extension(qemu_egl_display,
	109	"EGL_MESA_image_dma_buf_export")) {
38a55bdd	110	error_report("egl: EGL_MESA_image_dma_buf_export not supported");
1e316598 GH	111	goto err;
	112	}
	113
	114	qemu_egl_rn_ctx = qemu_egl_init_ctx();
	115	if (!qemu_egl_rn_ctx) {
38a55bdd	116	error_report("egl: egl_init_ctx failed");
1e316598 GH	117	goto err;
	118	}
	119
	120	return 0;
	121
	122	err:
	123	if (qemu_egl_rn_gbm_dev) {
	124	gbm_device_destroy(qemu_egl_rn_gbm_dev);
	125	}
	126	if (qemu_egl_rn_fd != -1) {
	127	close(qemu_egl_rn_fd);
	128	}
	129
	130	return -1;
	131	}
	132
	133	int egl_get_fd_for_texture(uint32_t tex_id, EGLint stride, EGLint fourcc)
	134	{
	135	EGLImageKHR image;
	136	EGLint num_planes, fd;
	137
	138	image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
	139	EGL_GL_TEXTURE_2D_KHR,
	140	(EGLClientBuffer)(unsigned long)tex_id,
	141	NULL);
	142	if (!image) {
	143	return -1;
	144	}
	145
	146	eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
	147	&num_planes, NULL);
	148	if (num_planes != 1) {
	149	eglDestroyImageKHR(qemu_egl_display, image);
	150	return -1;
	151	}
	152	eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
	153	eglDestroyImageKHR(qemu_egl_display, image);
	154
	155	return fd;
	156	}
	157
	158	#endif /* CONFIG_OPENGL_DMABUF */
	159
	160	/* ---------------------------------------------------------------------- */
	161
7ced9e9f GH	162	EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
	163	{
	164	EGLSurface esurface;
	165	EGLBoolean b;
	166
7ced9e9f GH	167	esurface = eglCreateWindowSurface(qemu_egl_display,
	168	qemu_egl_config,
	169	(EGLNativeWindowType)win, NULL);
	170	if (esurface == EGL_NO_SURFACE) {
38a55bdd	171	error_report("egl: eglCreateWindowSurface failed");
7ced9e9f GH	172	return NULL;
	173	}
	174
	175	b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
	176	if (b == EGL_FALSE) {
38a55bdd	177	error_report("egl: eglMakeCurrent failed");
7ced9e9f GH	178	return NULL;
	179	}
	180
	181	return esurface;
	182	}
	183
	184	/* ---------------------------------------------------------------------- */
	185
8bce03e3 GH	186	/*
	187	* Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
	188	*
	189	* Create an EGLDisplay from a native display type. This is a little quirky
	190	* for a few reasons.
	191	*
	192	* 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
	193	* use, but have different function signatures in the third argument; this
	194	* happens not to matter for us, at the moment, but it means epoxy won't alias
	195	* them together.
	196	*
	197	* 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
	198	* means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
	199	* will crash.
	200	*
	201	* 3: You can't tell whether you have EGL 1.5 at this point, because
	202	* eglQueryString(EGL_VERSION) is a property of the display, which we don't
	203	* have yet. So you have to query for extensions no matter what. Fortunately
	204	* epoxy_has_egl_extension _does_ let you query for client extensions, so
	205	* we don't have to write our own extension string parsing.
	206	*
	207	* 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
	208	* needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
	209	* function pointer.
	210	* We can workaround this (circular dependency) by probing for the EGL 1.5
	211	* platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
	212	* like mesa will be able to advertise these (even though it can do EGL 1.5).
	213	*/
e1913dbb GH	214	static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
e1913dbb GH	215	EGLenum platform)
8bce03e3 GH	216	{
	217	EGLDisplay dpy = EGL_NO_DISPLAY;
	218
8bce03e3 GH	219	/* In practise any EGL 1.5 implementation would support the EXT extension */
	220	if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
	221	PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
	222	(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
e1913dbb GH	223	if (getPlatformDisplayEXT && platform != 0) {
e1913dbb GH	224	dpy = getPlatformDisplayEXT(platform, native, NULL);
8bce03e3 GH	225	}
8bce03e3 GH	226	}
8bce03e3 GH	227
	228	if (dpy == EGL_NO_DISPLAY) {
	229	/* fallback */
	230	dpy = eglGetDisplay(native);
	231	}
	232	return dpy;
	233	}
	234
e1913dbb GH	235	static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
e1913dbb GH	236	EGLenum platform)
7ced9e9f GH	237	{
	238	static const EGLint conf_att_gl[] = {
	239	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
	240	EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
	241	EGL_RED_SIZE, 5,
	242	EGL_GREEN_SIZE, 5,
	243	EGL_BLUE_SIZE, 5,
	244	EGL_ALPHA_SIZE, 0,
	245	EGL_NONE,
	246	};
7ced9e9f GH	247	EGLint major, minor;
	248	EGLBoolean b;
	249	EGLint n;
	250
e1913dbb	251	qemu_egl_display = qemu_egl_get_display(dpy, platform);
7ced9e9f	252	if (qemu_egl_display == EGL_NO_DISPLAY) {
38a55bdd	253	error_report("egl: eglGetDisplay failed");
7ced9e9f GH	254	return -1;
	255	}
	256
7ced9e9f GH	257	b = eglInitialize(qemu_egl_display, &major, &minor);
7ced9e9f GH	258	if (b == EGL_FALSE) {
38a55bdd	259	error_report("egl: eglInitialize failed");
7ced9e9f GH	260	return -1;
	261	}
	262
9f728c79	263	b = eglBindAPI(EGL_OPENGL_API);
7ced9e9f	264	if (b == EGL_FALSE) {
38a55bdd	265	error_report("egl: eglBindAPI failed");
7ced9e9f GH	266	return -1;
	267	}
	268
9f728c79	269	b = eglChooseConfig(qemu_egl_display, conf_att_gl,
7ced9e9f GH	270	&qemu_egl_config, 1, &n);
7ced9e9f GH	271	if (b == EGL_FALSE \|\| n != 1) {
38a55bdd	272	error_report("egl: eglChooseConfig failed");
7ced9e9f GH	273	return -1;
7ced9e9f GH	274	}
7ced9e9f GH	275	return 0;
	276	}
	277
e1913dbb GH	278	int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy)
	279	{
	280	#ifdef EGL_KHR_platform_x11
	281	return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR);
	282	#else
	283	return qemu_egl_init_dpy(dpy, 0);
	284	#endif
	285	}
	286
	287	int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy)
	288	{
	289	#ifdef EGL_MESA_platform_gbm
	290	return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA);
	291	#else
	292	return qemu_egl_init_dpy(dpy, 0);
	293	#endif
	294	}
	295
7ced9e9f GH	296	EGLContext qemu_egl_init_ctx(void)
	297	{
	298	static const EGLint ctx_att_gl[] = {
bc8c946f	299	EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
7ced9e9f GH	300	EGL_NONE
7ced9e9f GH	301	};
7ced9e9f GH	302	EGLContext ectx;
	303	EGLBoolean b;
	304
7ced9e9f	305	ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
9f728c79	306	ctx_att_gl);
7ced9e9f	307	if (ectx == EGL_NO_CONTEXT) {
38a55bdd	308	error_report("egl: eglCreateContext failed");
7ced9e9f GH	309	return NULL;
	310	}
	311
	312	b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
	313	if (b == EGL_FALSE) {
38a55bdd	314	error_report("egl: eglMakeCurrent failed");
7ced9e9f GH	315	return NULL;
	316	}
	317
	318	return ectx;
	319	}