[Mesa-stable] [PATCH] mesa: allow GL_UNSIGNED_BYTE type for SNORM reads

[Dylan Baker]

Quoting Tapani Pälli (2018-08-27 04:46:37)
> OpenGL ES spec states:
>    "For normalized fixed-point rendering surfaces, the combination format
>     RGBA and type UNSIGNED_BYTE is accepted."
> 
> This fixes following failing VK-GL-CTS tests:
> 
>    KHR-GLES3.packed_pixels.pbo_rectangle.rgba8_snorm
>    KHR-GLES3.packed_pixels.rectangle.rgba8_snorm
>    KHR-GLES3.packed_pixels.varied_rectangle.rgba8_snorm
> 
> Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
> https://bugs.freedesktop.org/show_bug.cgi?id=107658
> Cc: mesa-stable at lists.freedesktop.org
> ---
> 
> This is a partial fix to the bug. I believe there are 2 separate
> issues within reported bug and this fixes the first one.
> 
>  src/mesa/main/readpix.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
> index 2cbb578a37f..556c860d393 100644
> --- a/src/mesa/main/readpix.c
> +++ b/src/mesa/main/readpix.c
> @@ -958,6 +958,15 @@ read_pixels_es3_error_check(struct gl_context *ctx, GLenum format, GLenum type,
>                 return GL_NO_ERROR;
>           }
>        }
> +      if (type == GL_UNSIGNED_BYTE) {
> +         switch (internalFormat) {
> +         case GL_R8_SNORM:
> +         case GL_RG8_SNORM:
> +         case GL_RGBA8_SNORM:
> +            if (_mesa_has_EXT_render_snorm(ctx))
> +               return GL_NO_ERROR;
> +         }
> +      }
>        break;
>     case GL_BGRA:
>        /* GL_EXT_read_format_bgra */
> -- 
> 2.14.4
> 

Hi Tapani,

This doesn't apply cleanly to 18.1 because "mesa: enable EXT_render_snorm
extension" isn't present on the branch. Does it still make sense to pull this
into 18.1?

Dylan
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