[Mesa-dev] [PATCH 02/14] glsl: Add constant evaluation of ir_unop_saturate

[Ian Romanick]

On 06/23/2014 10:27 PM, Abdiel Janulgue wrote:
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> ---
>  src/glsl/ir_constant_expression.cpp | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp
> index 8afe8f7..b885a2f 100644
> --- a/src/glsl/ir_constant_expression.cpp
> +++ b/src/glsl/ir_constant_expression.cpp
> @@ -1464,6 +1464,12 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
>        }
>        break;
>  
> +   case ir_unop_saturate:
> +      for (unsigned c = 0; c < components; c++) {
> +         data.f[c] = MIN2(MAX2(op[0]->value.f[c], 0.0f), 1.0f);

There's a CLAMP macro in src/mesa/main/macros.h.

> +      }
> +      break;
> +
>     case ir_triop_bitfield_extract: {
>        int offset = op[1]->value.i[0];
>        int bits = op[2]->value.i[0];
>