From 5f206a151584d42c3063845171585e3adec94723 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Wed, 29 Apr 2009 18:23:56 +0000
Subject: [PATCH] Clip planes

---
 panda/src/gobj/shader.cxx | 22 ++++++++++++++++++++++
 panda/src/gobj/shader.h   |  1 +
 2 files changed, 23 insertions(+)

diff --git a/panda/src/gobj/shader.cxx b/panda/src/gobj/shader.cxx
index 8a97b36f2c..cba06a52f6 100755
--- a/panda/src/gobj/shader.cxx
+++ b/panda/src/gobj/shader.cxx
@@ -353,6 +353,7 @@ cp_dependency(ShaderMatInput inp) {
       (inp == SMO_plight_x)||
       (inp == SMO_slight_x)||
       (inp == SMO_satten_x)||
+      (inp == SMO_clipplane_x)||
       (inp == SMO_mat_constant_x)||
       (inp == SMO_vec_constant_x)||
       (inp == SMO_view_x_to_view)||
@@ -794,6 +795,27 @@ compile_parameter(const ShaderArgId  &arg_id,
     _mat_spec.push_back(bind);
     return true;
   }
+
+  if (pieces[0] == "clipplane") {
+    if ((!cp_errchk_parameter_words(p,2))||
+        (!cp_errchk_parameter_in(p)) ||
+        (!cp_errchk_parameter_uniform(p))||
+        (!cp_errchk_parameter_float(p,4,4))) {
+      return false;
+    }
+    ShaderMatSpec bind;
+    bind._id = arg_id;
+    bind._piece = SMP_row3;
+    bind._func = SMF_first;
+    bind._part[0] = SMO_clipplane_x;
+    bind._arg[0] = InternalName::make(pieces[1]);
+    bind._part[1] = SMO_identity;
+    bind._arg[1] = NULL;
+
+    cp_optimize_mat_spec(bind);
+    _mat_spec.push_back(bind);
+    return true;
+  }
   
   // Keywords to access unusual parameters.
   
diff --git a/panda/src/gobj/shader.h b/panda/src/gobj/shader.h
index 25e91a7840..b683512ecc 100755
--- a/panda/src/gobj/shader.h
+++ b/panda/src/gobj/shader.h
@@ -79,6 +79,7 @@ public:
     SMO_slight_x,
     SMO_satten_x,
     SMO_plane_x,
+    SMO_clipplane_x,
     
     SMO_mat_constant_x,
     SMO_vec_constant_x,