OpenHarmony/third_party_mesa3d
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tweaks to the LIT instructions

Browse Source
This commit is contained in:
Brian Paul
2004-12-15 01:07:52 +00:00
parent 244adeb639
commit 55481b3a29
2 changed files with 11 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/mesa/swrast/s_nvfragprog.c
View File

@@ -1,6 +1,6 @@
/*
* Mesa 3-D graphics library
* Version: 6.1
* Version: 6.3
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
*
@@ -805,14 +805,16 @@ execute_program( GLcontext *ctx,
break;
case FP_OPCODE_LIT:
{
const GLfloat epsilon = 1.0F / 256.0F; /* from NV VP spec */
GLfloat a[4], result[4];
fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
if (a[0] < 0.0F)
a[0] = 0.0F;
if (a[1] < 0.0F)
a[1] = 0.0F;
a[0] = MAX2(a[0], 0.0F);
a[1] = MAX2(a[1], 0.0F);
/* XXX ARB version clamps a[3], NV version doesn't */
a[3] = CLAMP(a[3], -(128.0F - epsilon), (128.0F - epsilon));
result[0] = 1.0F;
result[1] = a[0];
/* XXX we could probably just use pow() here */
result[2] = (a[0] > 0.0F) ? (GLfloat) exp(a[3] * log(a[1])) : 0.0F;
result[3] = 1.0F;
store_vector4( inst, machine, result );