[Mesa-dev] [PATCH v3] mesa: readpixels add support for GL_HALF_FLOAT
Tapani Pälli
tapani.palli at intel.com
Tue Apr 3 05:42:25 UTC 2018
Hi Eric;
On 03/30/2018 11:25 PM, Eric Anholt wrote:
> Lin Johnson <johnson.lin at intel.com> writes:
>
>> Ext_color_buffer_half_float is using type GL_HALF_FLOAT
>> and data_type GL_FLOAT. This fix Android CTS test
>> android.view.cts.PixelCopyTest
>> v2: remove commtens of Ext_color_buffer_half_float.
>> As Ext_color_buffer__float can use type GL_HALF_FLOAT
>>
>> Reviewed-by: Palli, Tapani <tapani.palli at intel.com>
>> Signed-off-by: Lin Johnson <johnson.lin at intel.com>
>
> I've been looking into CTS issues on VC5, and I think this patch should
> be reverted.
After some inspection of the packed_pixels test I do agree, will revert
this. It's too bad dEQP does not have similar test. It bothers me a bit
though that 'reading pixels' section has hints that type could be
GL_HALF_FLOAT but no spec seems to add this capability, maybe that is
then only possible via IMPLEMENTATION_COLOR_READ_FORMAT?
> The issue is that the text above that in the spec disallows this case.
> From GLES 3.0.2:
>
> Only two combinations of format and type are accepted in most
> cases. The first varies depending on the format of the currently
> bound rendering surface. For normalized fixed-point rendering
> surfaces, the combination format RGBA and type UNSIGNED_BYTE is
> accepted. For signed integer rendering surfaces, the combina- tion
> format RGBA_INTEGER and type INT is accepted. For unsigned integer
> rendering surfaces, the combination format RGBA_INTEGER and type
> UNSIGNED_INT is accepted.
>
> [...]
>
> ReadPixels generates an INVALID_OPERATION error if the combination
> of format and type is unsupported.
>
> and this spec adds on to that first paragraph:
>
> For floating-point rendering surfaces, the combination
> format RGBA and type FLOAT is accepted.
>
> The second allowed combo is:
>
> The second is an implementation-chosen format from among those
> defined in table 3.2, excluding formats DEPTH_COMPONENT and
> DEPTH_STENCIL . The values of format and type for this format may be
> determined by calling Get- Integerv with the symbolic constants
> IMPLEMENTATION_COLOR_READ_FORMAT and IMPLEMENTATION_COLOR_READ_TYPE
> , respectively.
>
> The failing cases are in the CTS's packed_pixels testsuite, such as:
>
> KHR-GLES3.packed_pixels.pbo_rectangle.r11f_g11f_b10f
>
>
// Tapani
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