[Mesa-dev] [PATCH] state_tracker: Fix check for scissor enabled when < 0.

[Edward O'Callaghan]

Acked-by: Edward O'Callaghan <funfunctor at folklore1984.net>

On 10/15/2016 10:37 AM, Eric Anholt wrote:
> DEQP's clear tests like to give us x + w < 0 or y + h < 0.  Since we
> were comparing to an unsigned, it would get promoted to unsigned and come
> out as bignum >= width or height and we would clear the whole fb instead
> of none of the fb.
> 
> Fixes 10 tests under deqp-gles2/functional/color_clear.
> ---
>  src/mesa/state_tracker/st_cb_clear.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
> index 813ba9b10ffa..158efc186c05 100644
> --- a/src/mesa/state_tracker/st_cb_clear.c
> +++ b/src/mesa/state_tracker/st_cb_clear.c
> @@ -318,8 +318,8 @@ is_scissor_enabled(struct gl_context *ctx, struct gl_renderbuffer *rb)
>     return (ctx->Scissor.EnableFlags & 1) &&
>            (scissor->X > 0 ||
>             scissor->Y > 0 ||
> -           scissor->X + scissor->Width < rb->Width ||
> -           scissor->Y + scissor->Height < rb->Height);
> +           scissor->X + scissor->Width < (int)rb->Width ||
> +           scissor->Y + scissor->Height < (int)rb->Height);
>  }
>  
>  /**
> 

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