From: Xiang, Haihao <haihao.xiang@intel.com>
Date: Sun, 11 Mar 2007 14:41:26 +0000 (+0800)
Subject: fix for bug#10196
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=61ec23cc63a040a2edf1bc466917e85362514c89;p=mesa.git

fix for bug#10196

Compute half if LOCAL_VIEWER is enabled and the light is
a directional source.
---

diff --git a/src/mesa/drivers/dri/i965/brw_vs_tnl.c b/src/mesa/drivers/dri/i965/brw_vs_tnl.c
index 0d61092247a..c05a9b5ea10 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_tnl.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_tnl.c
@@ -988,7 +988,14 @@ static void build_lighting( struct tnl_program *p )
 	     */
 	    VPpli = register_param3(p, STATE_LIGHT, i, 
 				    STATE_POSITION_NORMALIZED); 
-	    half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
+            if (p->state->light_local_viewer) {
+                struct ureg eye_hat = get_eye_position_normalized(p);
+                half = get_temp(p);
+                emit_op2(p, OPCODE_SUB, half, 0, VPpli, eye_hat);
+                emit_normalize_vec3(p, half, half);
+            } else {
+                half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
+            }
 	 } 
 	 else {
 	    struct ureg Ppli = register_param3(p, STATE_LIGHT, i, 
diff --git a/src/mesa/tnl/t_vp_build.c b/src/mesa/tnl/t_vp_build.c
index 81266f3c8b4..2a97a1c8c76 100644
--- a/src/mesa/tnl/t_vp_build.c
+++ b/src/mesa/tnl/t_vp_build.c
@@ -939,7 +939,14 @@ static void build_lighting( struct tnl_program *p )
 	     */
 	    VPpli = register_param3(p, STATE_LIGHT, i, 
 				    STATE_POSITION_NORMALIZED); 
-	    half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
+            if (p->state->light_local_viewer) {
+                struct ureg eye_hat = get_eye_position_normalized(p);
+                half = get_temp(p);
+                emit_op2(p, OPCODE_SUB, half, 0, VPpli, eye_hat);
+                emit_normalize_vec3(p, half, half);
+            } else {
+                half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
+            }
 	 } 
 	 else {
 	    struct ureg Ppli = register_param3(p, STATE_LIGHT, i,