diff options
| -rw-r--r-- | src/mesa/tnl/t_vp_build.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mesa/tnl/t_vp_build.c b/src/mesa/tnl/t_vp_build.c index b28102b1b9..e7caa2fc1d 100644 --- a/src/mesa/tnl/t_vp_build.c +++ b/src/mesa/tnl/t_vp_build.c @@ -1110,8 +1110,6 @@ static void build_fog( struct tnl_program *p ) { struct ureg fog = register_output(p, VERT_RESULT_FOGC); struct ureg input; - GLuint useabs = p->state->fog_source_is_depth && p->state->fog_mode && - (p->state->fog_mode != FOG_EXP2); if (p->state->fog_source_is_depth) { input = swizzle1(get_eye_position(p), Z); @@ -1125,6 +1123,8 @@ static void build_fog( struct tnl_program *p ) STATE_FOG_PARAMS_OPTIMIZED); struct ureg tmp = get_temp(p); + GLboolean useabs = (p->state->fog_mode != FOG_EXP2); + if (useabs) { emit_op1(p, OPCODE_ABS, tmp, 0, input); } @@ -1156,7 +1156,10 @@ static void build_fog( struct tnl_program *p ) /* results = incoming fog coords (compute fog per-fragment later) * * KW: Is it really necessary to do anything in this case? + * BP: Yes, we always need to compute the absolute value, unless + * we want to push that down into the fragment program... */ + GLboolean useabs = GL_TRUE; emit_op1(p, useabs ? OPCODE_ABS : OPCODE_MOV, fog, WRITEMASK_X, input); } } |