[Mesa-dev] [PATCH 1/3] mesa: restrict ES2 from 32-bit blending, add GL_EXT_float_blend

[Ilia Mirkin]

On Mon, Nov 2, 2015 at 8:07 PM, Ian Romanick <idr at freedesktop.org> wrote:
> On 11/02/2015 04:50 PM, Ilia Mirkin wrote:
>> GL_EXT_color_buffer_float adds support for float buffers in ES3.0+, but
>> explicitly disallows 32-bit blending. However this restriction was never
>> implemented in mesa.
>>
>> Add the restriction, and also allow a driver to expose
>> GL_EXT_float_blend which re-enables the functionality.
>>
>> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
>> ---
>>
>> Untested... looking for confirmation that this is the right thing to
>> do. Will write a piglit if it is.
>
> Some flavor of this probably is the right thing to do.  The question is
> whether or not any hardware supported by Mesa can do
> GL_EXT_color_buffer_float but not GL_EXT_float_blend... if everyone can
> do both or neither, this patch series could be even simpler. :)

Adreno A3xx can't do 32-bit blending, only 16-bit. Sorry!