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egl-helpers: add functions for render nodes and dma-buf passing

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Adds helpers to open a drm render node and create a opengl
context for it.  Also add a helper to export a texture as
dma-buf.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-10-12 12:03:49 +02:00
parent 014cb152b8
commit 1e3165980c
2 changed files with 142 additions and 0 deletions
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13
include/ui/egl-helpers.h
View File

@ -3,10 +3,23 @@
#include <epoxy/gl.h>
#include <epoxy/egl.h>
#include <gbm.h>
extern EGLDisplay *qemu_egl_display;
extern EGLConfig qemu_egl_config;
#ifdef CONFIG_OPENGL_DMABUF
extern int qemu_egl_rn_fd;
extern struct gbm_device *qemu_egl_rn_gbm_dev;
extern EGLContext qemu_egl_rn_ctx;
int qemu_egl_rendernode_open(void);
int egl_rendernode_init(void);
int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc);
#endif
EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, Window win);
int qemu_egl_init_dpy(EGLNativeDisplayType dpy, bool gles, bool debug);

129
ui/egl-helpers.c
View File

@ -1,6 +1,8 @@
#include "qemu/osdep.h"
#include <glob.h>
#include <dirent.h>
#include "config-host.h"
#include "ui/egl-helpers.h"
EGLDisplay *qemu_egl_display;
@ -20,6 +22,133 @@ static int egl_debug;
/* ---------------------------------------------------------------------- */
#ifdef CONFIG_OPENGL_DMABUF
int qemu_egl_rn_fd;
struct gbm_device *qemu_egl_rn_gbm_dev;
EGLContext qemu_egl_rn_ctx;
int qemu_egl_rendernode_open(void)
{
DIR *dir;
struct dirent *e;
int r, fd;
char *p;
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;
}
r = asprintf(&p, "/dev/dri/%s", e->d_name);
if (r < 0) {
return -1;
}
r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
if (r < 0) {
free(p);
continue;
}
fd = r;
free(p);
break;
}
closedir(dir);
if (fd < 0) {
return -1;
}
return fd;
}
int egl_rendernode_init(void)
{
qemu_egl_rn_fd = -1;
qemu_egl_rn_fd = qemu_egl_rendernode_open();
if (qemu_egl_rn_fd == -1) {
fprintf(stderr, "egl: no drm render node available\n");
goto err;
}
qemu_egl_rn_gbm_dev = gbm_create_device(qemu_egl_rn_fd);
if (!qemu_egl_rn_gbm_dev) {
fprintf(stderr, "egl: gbm_create_device failed\n");
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")) {
fprintf(stderr, "egl: EGL_KHR_surfaceless_context not supported\n");
goto err;
}
if (!epoxy_has_egl_extension(qemu_egl_display,
"EGL_MESA_image_dma_buf_export")) {
fprintf(stderr, "egl: EGL_MESA_image_dma_buf_export not supported\n");
goto err;
}
qemu_egl_rn_ctx = qemu_egl_init_ctx();
if (!qemu_egl_rn_ctx) {
fprintf(stderr, "egl: egl_init_ctx failed\n");
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;