spirv: Apply OriginUpperLeft to FragCoord
This behaviour was changed in 1e5b09f4. The commit message for that says it is just a “tidy up” so my assumption is that the behaviour change was a mistake. It’s a little hard to decipher looking at the diff, but the previous code before that patch was: if (builtin == SpvBuiltInFragCoord || builtin == SpvBuiltInSamplePosition) nir_var->data.origin_upper_left = b->origin_upper_left; if (builtin == SpvBuiltInFragCoord) nir_var->data.pixel_center_integer = b->pixel_center_integer; After the patch the code was: case SpvBuiltInSamplePosition: nir_var->data.origin_upper_left = b->origin_upper_left; /* fallthrough */ case SpvBuiltInFragCoord: nir_var->data.pixel_center_integer = b->pixel_center_integer; break; Before the patch origin_upper_left affected both builtins and pixel_center_integer only affected FragCoord. After the patch origin_upper_left only affects SamplePosition and pixel_center_integer affects both variables. This patch tries to restore the previous behaviour by changing the code to: case SpvBuiltInFragCoord: nir_var->data.pixel_center_integer = b->pixel_center_integer; /* fallthrough */ case SpvBuiltInSamplePosition: nir_var->data.origin_upper_left = b->origin_upper_left; break; This change will be important for ARB_gl_spirv which is meant to support OriginLowerLeft. Reviewed-by:Jason Ekstrand <jason@jlekstrand.net> Reviewed-by:
Anuj Phogat <anuj.phogat@gmail.com> Fixes: 1e5b09f4 "spirv: Tidy some repeated if checks..." (cherry picked from commit e17d0ccb)
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