tgsi: use truncf in micro_trunc

Switches to using truncf in micro_trunc.

Fixes the following piglit tests (for softpipe):

/spec/glsl-1.30/execution/built-in-functions/...
fs-trunc-float
fs-trunc-vec2
fs-trunc-vec3
fs-trunc-vec4
vs-trunc-float
vs-trunc-vec2
vs-trunc-vec3
vs-trunc-vec4

/spec/glsl-1.50/execution/built-in-functions/...
gs-trunc-float
gs-trunc-vec2
gs-trunc-vec3
gs-trunc-vec4

Signed-off-by: Lars Hamre <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index 289fe043b7d..1457c060033 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -676,10 +676,10 @@ static void
 micro_trunc(union tgsi_exec_channel *dst,
             const union tgsi_exec_channel *src)
 {
-   dst->f[0] = (float)(int)src->f[0];
-   dst->f[1] = (float)(int)src->f[1];
-   dst->f[2] = (float)(int)src->f[2];
-   dst->f[3] = (float)(int)src->f[3];
+   dst->f[0] = truncf(src->f[0]);
+   dst->f[1] = truncf(src->f[1]);
+   dst->f[2] = truncf(src->f[2]);
+   dst->f[3] = truncf(src->f[3]);
 }
 
 static void