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intel/isl/gen7: Allow msaa with signed integer formats 

These formats are already allowed by the i965 GL driver, and the
feature seems to work just fine.

There are tests for multisampled rendering in piglit:
tests/spec/ext_framebuffer_multisample which can be patched to
try 16I/32I in addition to GL_RGBA8I.
IvyBridge passed all tests with all sample numbers.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Topi Pohjolainen 2017-07-18 17:06:07 +03:00
parent abb84e3f2d
commit df9bb8dc05
1 changed files with 3 additions and 2 deletions
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5
src/intel/isl/isl_gen7.c
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@ -76,9 +76,10 @@ isl_gen7_choose_msaa_layout(const struct isl_device *dev,
* Note that the above SINT restrictions apply only to *MSRTs* (that is,
* *multisampled* render targets). The restrictions seem to permit an MCS
* if the render target is singlesampled.
*
* Moreover, empirically it looks that hardware can render multisampled
* surfaces with RGBA8I, RGBA16I and RGBA32I.
*/
if (isl_format_has_sint_channel(info->format))
return false;
/* More obvious restrictions */
if (isl_surf_usage_is_display(info->usage))