[Spice-devel] [PATCH 2/8] egl-helpers: add functions for render nodes and dma-buf passing

[Marc-André Lureau]

Hi

On Thu, Feb 18, 2016 at 10:26 AM, Gerd Hoffmann <kraxel at redhat.com> wrote:
> 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 at redhat.com>
> ---
>  include/ui/egl-helpers.h |  13 +++++
>  ui/egl-helpers.c         | 129 +++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 142 insertions(+)
>
> diff --git a/include/ui/egl-helpers.h b/include/ui/egl-helpers.h
> index 8c84398..03fcf4b 100644
> --- a/include/ui/egl-helpers.h
> +++ b/include/ui/egl-helpers.h
> @@ -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);
> diff --git a/ui/egl-helpers.c b/ui/egl-helpers.c
> index 4c83834..54be44c 100644
> --- a/ui/egl-helpers.c
> +++ b/ui/egl-helpers.c
> @@ -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;
> --
> 1.8.3.1
>

Reviewed-by: Marc-André Lureau <marcandre.lureau at redhat.com>



-- 
Marc-André Lureau