need to use absolute value for RSQ

2005-10-30 16:52:02 +00:00
parent 5d04101d18
commit 094a1ddf24
1 changed files with 2 additions and 1 deletions
--- a/src/mesa/swrast/s_nvfragprog.c
+++ b/src/mesa/swrast/s_nvfragprog.c
@@ -1031,10 +1031,11 @@ execute_program( GLcontext *ctx,
            {
               GLfloat a[4], result[4];
               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
+               a[0] = FABSF(a[0]);
               result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
               store_vector4( inst, machine, result );
 #if DEBUG_FRAG
-               printf("RSQ %g = 1/sqrt(%g)\n", result[0], a[0]);
+               printf("RSQ %g = 1/sqrt(|%g|)\n", result[0], a[0]);
 #endif
            }
            break;