swrast: silence double->float assignment warnings

Reported by Karl Schultz.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/swrast/s_alpha.c b/src/mesa/swrast/s_alpha.c
index 5761bb00b4e..ebac562272f 100644
--- a/src/mesa/swrast/s_alpha.c
+++ b/src/mesa/swrast/s_alpha.c
@@ -146,8 +146,8 @@ _swrast_alpha_test(const GLcontext *ctx, SWspan *span)
          ALPHA_TEST(FixedToInt(alpha), alpha += alphaStep);
       }
       else {
-         const GLfloat alphaStep = span->alphaStep;
-         GLfloat alpha = span->alpha;
+         const GLfloat alphaStep = FIXED_TO_FLOAT(span->alphaStep);
+         GLfloat alpha = FIXED_TO_FLOAT(span->alpha);
          const GLfloat ref = ctx->Color.AlphaRef;
          ALPHA_TEST(alpha, alpha += alphaStep);
       }