From 7e1df6e67c3fbf3dd982dee6c576439b23935fbc Mon Sep 17 00:00:00 2001
From: Josh Yelon <jyelon@gmail.com>
Date: Wed, 9 Nov 2005 23:30:21 +0000
Subject: [PATCH] Added cardcenter

---
 panda/src/glstuff/glShaderContext_src.cxx | 21 ++++++++++++++++++++-
 panda/src/glstuff/glShaderContext_src.h   |  1 +
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/panda/src/glstuff/glShaderContext_src.cxx b/panda/src/glstuff/glShaderContext_src.cxx
index 0fef3106f6..eb592574cb 100755
--- a/panda/src/glstuff/glShaderContext_src.cxx
+++ b/panda/src/glstuff/glShaderContext_src.cxx
@@ -351,7 +351,7 @@ unbind()
 void CLP(ShaderContext)::
 issue_cg_auto_bind(const ShaderAutoBind &bind, GSG *gsg)
 {
-  LVecBase4f t;
+  LVecBase4f t; float xhi,yhi; int px,py;
 
   CGparameter p = bind.parameter;
   switch(bind.value) {
@@ -387,6 +387,17 @@ issue_cg_auto_bind(const ShaderAutoBind &bind, GSG *gsg)
     t[3] = 1;
     cgGLSetParameter4fv(p, t.get_data());
     return;
+  case SIC_sys_cardcenter:
+    px = gsg->_current_display_region->get_pixel_width();
+    py = gsg->_current_display_region->get_pixel_height();
+    xhi = (px*1.0) / Texture::up_to_power_2(px);
+    yhi = (py*1.0) / Texture::up_to_power_2(py);
+    t[0] = xhi*0.5;
+    t[1] = yhi*0.5;
+    t[2] = 1;
+    t[3] = 1;
+    cgGLSetParameter4fv(p, t.get_data());
+    return;
   }
 }
 #endif
@@ -1118,6 +1129,14 @@ compile_cg_parameter(CGparameter p)
       _cg_auto_param.push_back(bind);
       return true;
     }
+    if (pieces[1] == "cardcenter") {
+      if (!errchk_cg_parameter_type(p, CG_FLOAT2)) {
+        return false;
+      }
+      bind.value = SIC_sys_cardcenter;
+      _cg_auto_param.push_back(bind);
+      return true;
+    }
     errchk_cg_output(p,"unknown system parameter");
     return false;
   }
diff --git a/panda/src/glstuff/glShaderContext_src.h b/panda/src/glstuff/glShaderContext_src.h
index 029926a239..28dd6a2b25 100755
--- a/panda/src/glstuff/glShaderContext_src.h
+++ b/panda/src/glstuff/glShaderContext_src.h
@@ -74,6 +74,7 @@ private:
     // From this point forward, it's okay to insert stuff.
     SIC_sys_windowsize,
     SIC_sys_pixelsize,
+    SIC_sys_cardcenter,
   };
   struct ShaderAutoBind {
     CGparameter parameter;