From aee198bb90ed8ad6669e045db2ec4ec5f85e90b0 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 20 Jan 2012 22:29:11 +0200
Subject: [PATCH] Add a standard program feature for custom transforms

---
 source/program.cpp | 14 +++++++++++---
 source/program.h   |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/source/program.cpp b/source/program.cpp
index 6fa14953..64aa7bc5 100644
--- a/source/program.cpp
+++ b/source/program.cpp
@@ -20,11 +20,15 @@ const char *standard_vertex_src[] =
 	"l!n", "varying vec3 v_normal;\n",
 	"l",   "varying vec3 v_light_dir;\n",
 	"p",   "varying vec3 v_eye_dir;\n",
+	"r",   "vec4 transform_vertex(vec4);\n",
+	"lr",  "vec3 transform_normal(vec3);\n",
 	 0,    "void main()\n",
 	 0,    "{\n",
-	 0,    "\tvec4 eye_pos = gl_ModelViewMatrix*gl_Vertex;\n",
+	"r",   "\tvec4 eye_pos = transform_vertex(gl_Vertex);\n",
+	"!r",  "\tvec4 eye_pos = gl_ModelViewMatrix*gl_Vertex;\n",
 	 0,    "\tgl_Position = gl_ProjectionMatrix*eye_pos;\n",
-	"l",   "\tvec3 eye_normal = gl_NormalMatrix*gl_Normal;\n",
+	"lr",  "\tvec3 eye_normal = transform_normal(gl_Normal);\n",
+	"l!r", "\tvec3 eye_normal = gl_NormalMatrix*gl_Normal;\n",
 	"l!n", "\tv_normal = eye_normal;\n",
 	"n",   "\tvec3 eye_tangent = gl_NormalMatrix*tangent;\n",
 	"n",   "\tvec3 eye_binormal = gl_NormalMatrix*binormal;\n",
@@ -276,7 +280,8 @@ Program::StandardFeatures::StandardFeatures():
 	lighting(false),
 	specular(false),
 	normalmap(false),
-	shadow(false)
+	shadow(false),
+	transform(false)
 { }
 
 string Program::StandardFeatures::create_flags() const
@@ -296,6 +301,8 @@ string Program::StandardFeatures::create_flags() const
 	}
 	if(shadow)
 		flags += 's';
+	if(transform)
+		flags += 'r';
 
 	return flags;
 }
@@ -349,6 +356,7 @@ Program::StandardFeatures::Loader::Loader(StandardFeatures &f):
 	add("shadow",    &StandardFeatures::shadow);
 	add("specular",  &StandardFeatures::specular);
 	add("texture",   &StandardFeatures::texture);
+	add("transform", &StandardFeatures::transform);
 }
 
 } // namespace GL
diff --git a/source/program.h b/source/program.h
index b875ec79..c3c6cc03 100644
--- a/source/program.h
+++ b/source/program.h
@@ -43,6 +43,7 @@ public:
 		bool specular;
 		bool normalmap;
 		bool shadow;
+		bool transform;
 
 		StandardFeatures();
 
-- 
2.45.2