[Mesa-dev] [PATCH 7/7] i965: Lift some restrictions on dma_buf EGLImages

[Tapani Pälli]

For the whole series

Reviewed-by: Tapani Pälli <tapani.palli at intel.com>

On 04/10/2015 06:57 AM, Chad Versace wrote:
> Allow glEGLImageTargetRenderbufferStorageOES and
> glEGLImageTargetTexture2DOES for dma_buf EGLImages if the image is
> a single RGBA8 unorm plane. This is safe, despite fast color clears,
> because i965 disables allocation of auxiliary buffers for EGLImages.
>
> Chrome OS needs this, because its compositor uses dma_buf EGLImages for
> its scanout buffers.
>
> Testing:
>    - Tested on Ivybridge Chromebook Pixel with WebGL Aquarium and
>      YouTube.
>    - No Piglit regressions on Broadwell with `piglit run -p gbm
>      tests/quick.py`, with my Piglit patches that update the
>      EGL_EXT_image_dma_buf_import tests.
>
> Cc: Jordan Justen <jordan.l.justen at intel.com>
> Cc: Tapani Pälli <tapani.palli at intel.com>
> Cc: Topi Pohjolainen <topi.pohjolainen at intel.com>
> Cc: Zach Reizner <zachr at google.com>
> Cc: Frank Henigman <fjhenigman at google.com>
> Cc: Marta Lofstedt <marta.lofstedt at intel.com>
> Cc: Haixia Shi <hshi at chromium.org>
> ---
>   src/mesa/drivers/dri/i965/intel_fbo.c       |  7 -------
>   src/mesa/drivers/dri/i965/intel_image.h     | 10 +++++-----
>   src/mesa/drivers/dri/i965/intel_tex_image.c | 12 ++----------
>   3 files changed, 7 insertions(+), 22 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/intel_fbo.c b/src/mesa/drivers/dri/i965/intel_fbo.c
> index fb26038..8a398f7 100644
> --- a/src/mesa/drivers/dri/i965/intel_fbo.c
> +++ b/src/mesa/drivers/dri/i965/intel_fbo.c
> @@ -363,13 +363,6 @@ intel_image_target_renderbuffer_storage(struct gl_context *ctx,
>         return;
>      }
>
> -   /* Buffers originating from outside are for read-only. */
> -   if (image->dma_buf_imported) {
> -      _mesa_error(ctx, GL_INVALID_OPERATION,
> -            "glEGLImageTargetRenderbufferStorage(dma buffers are read-only)");
> -      return;
> -   }
> -
>      /* __DRIimage is opaque to the core so it has to be checked here */
>      switch (image->format) {
>      case MESA_FORMAT_R8G8B8A8_UNORM:
> diff --git a/src/mesa/drivers/dri/i965/intel_image.h b/src/mesa/drivers/dri/i965/intel_image.h
> index 0cae711..a82cf3b 100644
> --- a/src/mesa/drivers/dri/i965/intel_image.h
> +++ b/src/mesa/drivers/dri/i965/intel_image.h
> @@ -89,18 +89,18 @@ struct __DRIimageRec {
>      GLuint tile_y;
>      bool has_depthstencil;
>
> +   /** The image was created with EGL_EXT_image_dma_buf_import. */
> +   bool dma_buf_imported;
> +
>      /**
>       * Provided by EGL_EXT_image_dma_buf_import.
> -    *
> -    * The flag is set in order to restrict the use of the image later on.
> -    *
> -    * See intel_image_target_texture_2d()
> +    * \{
>       */
> -   bool dma_buf_imported;
>      enum __DRIYUVColorSpace yuv_color_space;
>      enum __DRISampleRange sample_range;
>      enum __DRIChromaSiting horizontal_siting;
>      enum __DRIChromaSiting vertical_siting;
> +   /* \} */
>
>      void *data;
>   };
> diff --git a/src/mesa/drivers/dri/i965/intel_tex_image.c b/src/mesa/drivers/dri/i965/intel_tex_image.c
> index 290d313..b70f8de 100644
> --- a/src/mesa/drivers/dri/i965/intel_tex_image.c
> +++ b/src/mesa/drivers/dri/i965/intel_tex_image.c
> @@ -320,17 +320,9 @@ intel_image_target_texture_2d(struct gl_context *ctx, GLenum target,
>      if (image == NULL)
>         return;
>
> -   /**
> -    * Images originating via EGL_EXT_image_dma_buf_import can be used only
> -    * with GL_OES_EGL_image_external only.
> +   /* We support external textures only for EGLImages created with
> +    * EGL_EXT_image_dma_buf_import. We may lift that restriction in the future.
>       */
> -   if (image->dma_buf_imported && target != GL_TEXTURE_EXTERNAL_OES) {
> -      _mesa_error(ctx, GL_INVALID_OPERATION,
> -            "glEGLImageTargetTexture2DOES(dma buffers can be used with "
> -               "GL_OES_EGL_image_external only");
> -      return;
> -   }
> -
>      if (target == GL_TEXTURE_EXTERNAL_OES && !image->dma_buf_imported) {
>         _mesa_error(ctx, GL_INVALID_OPERATION,
>               "glEGLImageTargetTexture2DOES(external target is enabled only "
>