[Mesa-stable] [PATCH] mesa: implement missing glGet(GL_RGBA_SIGNED_COMPONENTS_EXT) query

[Ian Romanick]

There are fixes on top of this fix.  When they get picked over to the
stable branch, I think at least this and the one from 050961.html should
get squashed together.

http://lists.freedesktop.org/archives/mesa-dev/2014-January/050961.html
http://lists.freedesktop.org/archives/mesa-dev/2014-January/050962.html

On 01/06/2014 11:57 AM, Brian Paul wrote:
> This is part of the GL_EXT_packed_float extension.
> 
> Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=73096
> Cc: 10.0 <mesa-stable at lists.freedesktop.org>
> ---
>  src/mesa/main/formats.c          |   19 +++++++++++++++++++
>  src/mesa/main/formats.h          |    3 +++
>  src/mesa/main/get.c              |   21 +++++++++++++++++++++
>  src/mesa/main/get_hash_params.py |    3 +++
>  4 files changed, 46 insertions(+)
> 
> diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
> index 07d2a72..eb2a07e 100644
> --- a/src/mesa/main/formats.c
> +++ b/src/mesa/main/formats.c
> @@ -1967,6 +1967,25 @@ _mesa_is_format_unsigned(gl_format format)
>  
>  
>  /**
> + * Does the given format store signed values?
> + */
> +GLboolean
> +_mesa_is_format_signed(gl_format format)
> +{
> +   if (format == MESA_FORMAT_R11_G11_B10_FLOAT) {
> +      /* this packed float format only stores unsigned values */
> +      return GL_FALSE;
> +   }
> +   else {
> +      const struct gl_format_info *info = _mesa_get_format_info(format);
> +      return (info->DataType == GL_SIGNED_NORMALIZED ||
> +              info->DataType == GL_INT ||
> +              info->DataType == GL_FLOAT);
> +   }
> +}
> +
> +
> +/**
>   * Return color encoding for given format.
>   * \return GL_LINEAR or GL_SRGB
>   */
> diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
> index 64b4b9a..0c91aea 100644
> --- a/src/mesa/main/formats.h
> +++ b/src/mesa/main/formats.h
> @@ -341,6 +341,9 @@ _mesa_is_format_integer_color(gl_format format);
>  extern GLboolean
>  _mesa_is_format_unsigned(gl_format format);
>  
> +extern GLboolean
> +_mesa_is_format_signed(gl_format format);
> +
>  extern GLenum
>  _mesa_get_format_color_encoding(gl_format format);
>  
> diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
> index 6913808..596942c 100644
> --- a/src/mesa/main/get.c
> +++ b/src/mesa/main/get.c
> @@ -327,6 +327,12 @@ static const int extra_EXT_framebuffer_sRGB_and_new_buffers[] = {
>     EXTRA_END
>  };
>  
> +static const int extra_EXT_packed_float[] = {
> +   EXT(EXT_packed_float),
> +   EXTRA_NEW_BUFFERS,
> +   EXTRA_END
> +};
> +
>  static const int extra_EXT_texture_array_es3[] = {
>     EXT(EXT_texture_array),
>     EXTRA_API_ES3,
> @@ -757,6 +763,21 @@ find_custom_value(struct gl_context *ctx, const struct value_desc *d, union valu
>  	 ctx->Texture.Unit[unit].CurrentTex[d->offset]->Name;
>        break;
>  
> +   /* GL_EXT_packed_float */
> +   case GL_RGBA_SIGNED_COMPONENTS_EXT:
> +      {
> +         /* Note: we only check the 0th color attachment. */
> +         const struct gl_renderbuffer *rb =
> +            ctx->DrawBuffer->_ColorDrawBuffers[0];
> +         const GLboolean signd =
> +            rb ? _mesa_is_format_signed(rb->Format) : GL_FALSE;
> +         v->value_int_4[0] =
> +         v->value_int_4[1] =
> +         v->value_int_4[2] =
> +         v->value_int_4[3] = signd;
> +      }
> +      break;
> +
>     /* GL_ARB_vertex_buffer_object */
>     case GL_VERTEX_ARRAY_BUFFER_BINDING_ARB:
>     case GL_NORMAL_ARRAY_BUFFER_BINDING_ARB:
> diff --git a/src/mesa/main/get_hash_params.py b/src/mesa/main/get_hash_params.py
> index 653bf62..f763e09 100644
> --- a/src/mesa/main/get_hash_params.py
> +++ b/src/mesa/main/get_hash_params.py
> @@ -611,6 +611,9 @@ descriptor=[
>  # GL_ARB_fragment_program
>    [ "FRAGMENT_PROGRAM_ARB", "CONTEXT_BOOL(FragmentProgram.Enabled), extra_ARB_fragment_program" ],
>  
> +# GL_EXT_packed_depth_stencil
> +  [ "RGBA_SIGNED_COMPONENTS_EXT", "LOC_CUSTOM, TYPE_INT_4, 0, extra_EXT_packed_float" ],
> +
>  # GL_EXT_depth_bounds_test
>    [ "DEPTH_BOUNDS_TEST_EXT", "CONTEXT_BOOL(Depth.BoundsTest), extra_EXT_depth_bounds_test" ],
>    [ "DEPTH_BOUNDS_EXT", "CONTEXT_FLOAT2(Depth.BoundsMin), extra_EXT_depth_bounds_test" ],
>