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

/*
 * 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 void egl_fb_delete_texture(egl_fb *fb)
{
    if (!fb->delete_texture) {
        return;
    }

    glDeleteTextures(1, &fb->texture);
    fb->delete_texture = false;
}

void egl_fb_destroy(egl_fb *fb)
{
    if (!fb->framebuffer) {
        return;
    }

    egl_fb_delete_texture(fb);
    glDeleteFramebuffers(1, &fb->framebuffer);

    fb->width = 0;
    fb->height = 0;
    fb->texture = 0;
    fb->framebuffer = 0;
}

void egl_fb_setup_default(egl_fb *fb, int width, int height)
{
    fb->width = width;
    fb->height = height;
    fb->framebuffer = 0; /* default framebuffer */
}

void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
                          GLuint texture, bool delete)
{
    egl_fb_delete_texture(fb);

    fb->width = width;
    fb->height = height;
    fb->texture = texture;
    fb->delete_texture = delete;
    if (!fb->framebuffer) {
        glGenFramebuffers(1, &fb->framebuffer);
    }

    glBindFramebuffer(GL_FRAMEBUFFER_EXT, fb->framebuffer);
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
                              GL_TEXTURE_2D, fb->texture, 0);
}

void egl_fb_setup_new_tex(egl_fb *fb, int width, int height)
{
    GLuint texture;

    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
                 0, GL_BGRA, GL_UNSIGNED_BYTE, 0);

    egl_fb_setup_for_tex(fb, width, height, texture, true);
}

void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip)
{
    GLuint y1, y2;

    glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst->framebuffer);
    glViewport(0, 0, dst->width, dst->height);
    y1 = flip ? src->height : 0;
    y2 = flip ? 0 : src->height;
    glBlitFramebuffer(0, y1, src->width, y2,
                      0, 0, dst->width, dst->height,
                      GL_COLOR_BUFFER_BIT, GL_LINEAR);
}

void egl_fb_read(void *dst, egl_fb *src)
{
    glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
    glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
    glReadPixels(0, 0, src->width, src->height,
                 GL_BGRA, GL_UNSIGNED_BYTE, dst);
}

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

#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 <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	*/
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
6fafc260 GH	27	/* ------------------------------------------------------------------ */
6fafc260 GH	28
74083f9c GH	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
6fafc260 GH	39	void egl_fb_destroy(egl_fb *fb)
	40	{
	41	if (!fb->framebuffer) {
	42	return;
	43	}
	44
74083f9c	45	egl_fb_delete_texture(fb);
6fafc260 GH	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
74083f9c GH	61	void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
74083f9c GH	62	GLuint texture, bool delete)
6fafc260	63	{
74083f9c GH	64	egl_fb_delete_texture(fb);
74083f9c GH	65
6fafc260 GH	66	fb->width = width;
	67	fb->height = height;
	68	fb->texture = texture;
74083f9c	69	fb->delete_texture = delete;
6fafc260 GH	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
74083f9c	79	void egl_fb_setup_new_tex(egl_fb *fb, int width, int height)
6fafc260 GH	80	{
	81	GLuint texture;
	82
	83	glGenTextures(1, &texture);
	84	glBindTexture(GL_TEXTURE_2D, texture);
	85	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height,
	86	0, GL_BGRA, GL_UNSIGNED_BYTE, 0);
	87
74083f9c	88	egl_fb_setup_for_tex(fb, width, height, texture, true);
6fafc260 GH	89	}
	90
	91	void egl_fb_blit(egl_fb dst, egl_fb src, bool flip)
	92	{
	93	GLuint y1, y2;
	94
	95	glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
	96	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst->framebuffer);
	97	glViewport(0, 0, dst->width, dst->height);
	98	y1 = flip ? src->height : 0;
	99	y2 = flip ? 0 : src->height;
	100	glBlitFramebuffer(0, y1, src->width, y2,
	101	0, 0, dst->width, dst->height,
	102	GL_COLOR_BUFFER_BIT, GL_LINEAR);
	103	}
	104
	105	void egl_fb_read(void dst, egl_fb src)
	106	{
	107	glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer);
	108	glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
	109	glReadPixels(0, 0, src->width, src->height,
	110	GL_BGRA, GL_UNSIGNED_BYTE, dst);
	111	}
	112
7ced9e9f GH	113	/* ---------------------------------------------------------------------- */
7ced9e9f GH	114
1e316598 GH	115	#ifdef CONFIG_OPENGL_DMABUF
	116
	117	int qemu_egl_rn_fd;
	118	struct gbm_device *qemu_egl_rn_gbm_dev;
	119	EGLContext qemu_egl_rn_ctx;
	120
7b525508	121	static int qemu_egl_rendernode_open(const char *rendernode)
1e316598 GH	122	{
	123	DIR *dir;
	124	struct dirent *e;
	125	int r, fd;
	126	char *p;
	127
7b525508 MAL	128	if (rendernode) {
	129	return open(rendernode, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	130	}
	131
1e316598 GH	132	dir = opendir("/dev/dri");
	133	if (!dir) {
	134	return -1;
	135	}
	136
	137	fd = -1;
	138	while ((e = readdir(dir))) {
	139	if (e->d_type != DT_CHR) {
	140	continue;
	141	}
	142
	143	if (strncmp(e->d_name, "renderD", 7)) {
	144	continue;
	145	}
	146
f454f49c	147	p = g_strdup_printf("/dev/dri/%s", e->d_name);
1e316598 GH	148
	149	r = open(p, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	150	if (r < 0) {
f454f49c	151	g_free(p);
1e316598 GH	152	continue;
	153	}
	154	fd = r;
f454f49c	155	g_free(p);
1e316598 GH	156	break;
	157	}
	158
	159	closedir(dir);
	160	if (fd < 0) {
	161	return -1;
	162	}
	163	return fd;
	164	}
	165
7b525508	166	int egl_rendernode_init(const char *rendernode)
1e316598 GH	167	{
1e316598 GH	168	qemu_egl_rn_fd = -1;
151c8e60	169	int rc;
1e316598	170
7b525508	171	qemu_egl_rn_fd = qemu_egl_rendernode_open(rendernode);
1e316598	172	if (qemu_egl_rn_fd == -1) {
38a55bdd	173	error_report("egl: no drm render node available");
1e316598 GH	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) {
38a55bdd	179	error_report("egl: gbm_create_device failed");
1e316598 GH	180	goto err;
	181	}
	182
151c8e60 GH	183	rc = qemu_egl_init_dpy_mesa((EGLNativeDisplayType)qemu_egl_rn_gbm_dev);
	184	if (rc != 0) {
	185	/* qemu_egl_init_dpy_mesa reports error */
	186	goto err;
	187	}
1e316598 GH	188
	189	if (!epoxy_has_egl_extension(qemu_egl_display,
	190	"EGL_KHR_surfaceless_context")) {
38a55bdd	191	error_report("egl: EGL_KHR_surfaceless_context not supported");
1e316598 GH	192	goto err;
	193	}
	194	if (!epoxy_has_egl_extension(qemu_egl_display,
	195	"EGL_MESA_image_dma_buf_export")) {
38a55bdd	196	error_report("egl: EGL_MESA_image_dma_buf_export not supported");
1e316598 GH	197	goto err;
	198	}
	199
	200	qemu_egl_rn_ctx = qemu_egl_init_ctx();
	201	if (!qemu_egl_rn_ctx) {
38a55bdd	202	error_report("egl: egl_init_ctx failed");
1e316598 GH	203	goto err;
	204	}
	205
	206	return 0;
	207
	208	err:
	209	if (qemu_egl_rn_gbm_dev) {
	210	gbm_device_destroy(qemu_egl_rn_gbm_dev);
	211	}
	212	if (qemu_egl_rn_fd != -1) {
	213	close(qemu_egl_rn_fd);
	214	}
	215
	216	return -1;
	217	}
	218
	219	int egl_get_fd_for_texture(uint32_t tex_id, EGLint stride, EGLint fourcc)
	220	{
	221	EGLImageKHR image;
	222	EGLint num_planes, fd;
	223
	224	image = eglCreateImageKHR(qemu_egl_display, eglGetCurrentContext(),
	225	EGL_GL_TEXTURE_2D_KHR,
	226	(EGLClientBuffer)(unsigned long)tex_id,
	227	NULL);
	228	if (!image) {
	229	return -1;
	230	}
	231
	232	eglExportDMABUFImageQueryMESA(qemu_egl_display, image, fourcc,
	233	&num_planes, NULL);
	234	if (num_planes != 1) {
	235	eglDestroyImageKHR(qemu_egl_display, image);
	236	return -1;
	237	}
	238	eglExportDMABUFImageMESA(qemu_egl_display, image, &fd, stride, NULL);
	239	eglDestroyImageKHR(qemu_egl_display, image);
	240
	241	return fd;
	242	}
	243
	244	#endif /* CONFIG_OPENGL_DMABUF */
	245
	246	/* ---------------------------------------------------------------------- */
	247
7ced9e9f GH	248	EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win)
	249	{
	250	EGLSurface esurface;
	251	EGLBoolean b;
	252
7ced9e9f GH	253	esurface = eglCreateWindowSurface(qemu_egl_display,
	254	qemu_egl_config,
	255	(EGLNativeWindowType)win, NULL);
	256	if (esurface == EGL_NO_SURFACE) {
38a55bdd	257	error_report("egl: eglCreateWindowSurface failed");
7ced9e9f GH	258	return NULL;
	259	}
	260
	261	b = eglMakeCurrent(qemu_egl_display, esurface, esurface, ectx);
	262	if (b == EGL_FALSE) {
38a55bdd	263	error_report("egl: eglMakeCurrent failed");
7ced9e9f GH	264	return NULL;
	265	}
	266
	267	return esurface;
	268	}
	269
	270	/* ---------------------------------------------------------------------- */
	271
8bce03e3 GH	272	/*
	273	* Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
	274	*
	275	* Create an EGLDisplay from a native display type. This is a little quirky
	276	* for a few reasons.
	277	*
	278	* 1: GetPlatformDisplayEXT and GetPlatformDisplay are the API you want to
	279	* use, but have different function signatures in the third argument; this
	280	* happens not to matter for us, at the moment, but it means epoxy won't alias
	281	* them together.
	282	*
	283	* 2: epoxy 1.3 and earlier don't understand EGL client extensions, which
	284	* means you can't call "eglGetPlatformDisplayEXT" directly, as the resolver
	285	* will crash.
	286	*
	287	* 3: You can't tell whether you have EGL 1.5 at this point, because
	288	* eglQueryString(EGL_VERSION) is a property of the display, which we don't
	289	* have yet. So you have to query for extensions no matter what. Fortunately
	290	* epoxy_has_egl_extension _does_ let you query for client extensions, so
	291	* we don't have to write our own extension string parsing.
	292	*
	293	* 4. There is no EGL_KHR_platform_base to complement the EXT one, thus one
	294	* needs to know EGL 1.5 is supported in order to use the eglGetPlatformDisplay
	295	* function pointer.
	296	* We can workaround this (circular dependency) by probing for the EGL 1.5
	297	* platform extensions (EGL_KHR_platform_gbm and friends) yet it doesn't seem
	298	* like mesa will be able to advertise these (even though it can do EGL 1.5).
	299	*/
e1913dbb GH	300	static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
e1913dbb GH	301	EGLenum platform)
8bce03e3 GH	302	{
	303	EGLDisplay dpy = EGL_NO_DISPLAY;
	304
8bce03e3 GH	305	/* In practise any EGL 1.5 implementation would support the EXT extension */
	306	if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
	307	PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
	308	(void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
e1913dbb GH	309	if (getPlatformDisplayEXT && platform != 0) {
e1913dbb GH	310	dpy = getPlatformDisplayEXT(platform, native, NULL);
8bce03e3 GH	311	}
8bce03e3 GH	312	}
8bce03e3 GH	313
	314	if (dpy == EGL_NO_DISPLAY) {
	315	/* fallback */
	316	dpy = eglGetDisplay(native);
	317	}
	318	return dpy;
	319	}
	320
e1913dbb GH	321	static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
e1913dbb GH	322	EGLenum platform)
7ced9e9f GH	323	{
	324	static const EGLint conf_att_gl[] = {
	325	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
	326	EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
	327	EGL_RED_SIZE, 5,
	328	EGL_GREEN_SIZE, 5,
	329	EGL_BLUE_SIZE, 5,
	330	EGL_ALPHA_SIZE, 0,
	331	EGL_NONE,
	332	};
7ced9e9f GH	333	EGLint major, minor;
	334	EGLBoolean b;
	335	EGLint n;
	336
e1913dbb	337	qemu_egl_display = qemu_egl_get_display(dpy, platform);
7ced9e9f	338	if (qemu_egl_display == EGL_NO_DISPLAY) {
38a55bdd	339	error_report("egl: eglGetDisplay failed");
7ced9e9f GH	340	return -1;
	341	}
	342
7ced9e9f GH	343	b = eglInitialize(qemu_egl_display, &major, &minor);
7ced9e9f GH	344	if (b == EGL_FALSE) {
38a55bdd	345	error_report("egl: eglInitialize failed");
7ced9e9f GH	346	return -1;
	347	}
	348
9f728c79	349	b = eglBindAPI(EGL_OPENGL_API);
7ced9e9f	350	if (b == EGL_FALSE) {
38a55bdd	351	error_report("egl: eglBindAPI failed");
7ced9e9f GH	352	return -1;
	353	}
	354
9f728c79	355	b = eglChooseConfig(qemu_egl_display, conf_att_gl,
7ced9e9f GH	356	&qemu_egl_config, 1, &n);
7ced9e9f GH	357	if (b == EGL_FALSE \|\| n != 1) {
38a55bdd	358	error_report("egl: eglChooseConfig failed");
7ced9e9f GH	359	return -1;
7ced9e9f GH	360	}
7ced9e9f GH	361	return 0;
	362	}
	363
e1913dbb GH	364	int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy)
	365	{
	366	#ifdef EGL_KHR_platform_x11
	367	return qemu_egl_init_dpy(dpy, EGL_PLATFORM_X11_KHR);
	368	#else
	369	return qemu_egl_init_dpy(dpy, 0);
	370	#endif
	371	}
	372
	373	int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy)
	374	{
	375	#ifdef EGL_MESA_platform_gbm
	376	return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA);
	377	#else
	378	return qemu_egl_init_dpy(dpy, 0);
	379	#endif
	380	}
	381
7ced9e9f GH	382	EGLContext qemu_egl_init_ctx(void)
	383	{
	384	static const EGLint ctx_att_gl[] = {
bc8c946f	385	EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
7ced9e9f GH	386	EGL_NONE
7ced9e9f GH	387	};
7ced9e9f GH	388	EGLContext ectx;
	389	EGLBoolean b;
	390
7ced9e9f	391	ectx = eglCreateContext(qemu_egl_display, qemu_egl_config, EGL_NO_CONTEXT,
9f728c79	392	ctx_att_gl);
7ced9e9f	393	if (ectx == EGL_NO_CONTEXT) {
38a55bdd	394	error_report("egl: eglCreateContext failed");
7ced9e9f GH	395	return NULL;
	396	}
	397
	398	b = eglMakeCurrent(qemu_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, ectx);
	399	if (b == EGL_FALSE) {
38a55bdd	400	error_report("egl: eglMakeCurrent failed");
7ced9e9f GH	401	return NULL;
	402	}
	403
	404	return ectx;
	405	}