3 files changed, 31 insertions, 7 deletions

diff --git a/src/render/draw.cc b/src/render/draw.cc
index 52933b7..4392f87 100644
--- a/src/render/draw.cc
+++ b/src/render/draw.cc
@@ -535,6 +535,27 @@ void draw_fragment(model::Fragment *fragment, bool draw_details)
 			Stats::quads += vertex_count / 4;
 			break;
 	}
+
+	if (r_normals->value()) {
+		gl::begin(gl::Lines );
+
+		gl::color(1.0f, 0.0f, 0.0f);
+
+		const float s = 0.1f;
+
+		const float *n = core::game()->vertexarray()->normal() + index * 3;
+		const float *v = core::game()->vertexarray()->vertex() + index * 3;
+
+		for (size_t i = 0; i < vertex_count; i++) {
+			gl::normal(-n[i*3], -n[i*3 +1 ], -n[i*3 +2]);
+			gl::vertex(v[i*3], v[i*3 +1 ], v[i*3 +2]);
+
+			gl::normal(n[i*3], n[i*3 +1 ], n[i*3 +2]);
+			gl::vertex(v[i*3] + n[i*3] * s, v[i*3 +1]  + n[i*3 +1] * s, v[i*3 +2] + n[i*3+2] * s);
+		}
+		gl::end();
+	}
+
 }
 
 void draw_model_fragments(model::Model *model,
@@ -543,6 +564,7 @@ void draw_model_fragments(model::Model *model,
 {
 	// default material, lighted and geometry color
 	const model::Material *material = 0;
+	math::Color color(1.0f, 0.0f, 1.0f); // current drawing color
 	bool use_light = true;		// gl::disable(GL_LIGHTING) is set
 	bool use_env = false;		// environment mapping
 	//bool use_color_array = true;	// glEnableClientState(GL_COLOR_ARRAY) is set
@@ -587,8 +609,6 @@ void draw_model_fragments(model::Model *model,
 							glDisableClientState(GL_COLOR_ARRAY);
 						}*/
 		
-						math::Color color;
-		
 						if ((material->flags() & model::Material::Tertiary) == model::Material::Tertiary) {
 							for (size_t i = 0; i < 3; i++)
 								color[i] = (color_primary[i] + color_secondary[i]) / 2;
@@ -603,15 +623,12 @@ void draw_model_fragments(model::Model *model,
 						color.r *= material->color().r;
 						color.g *= material->color().g;
 						color.b *= material->color().b;
-		
-						gl::color(color);
-				
 					} else {
 /*						if (!use_color_array) {
 							glEnableClientState(GL_COLOR_ARRAY);
 							use_color_array = true;
 						}*/
-						gl::color(material->color());
+						color.assign(material->color());
 					}
 		
 					if (power && (material->flags() & model::Material::Bright)) {
@@ -671,10 +688,11 @@ void draw_model_fragments(model::Model *model,
 						glEnableClientState(GL_COLOR_ARRAY);
 						use_color_array = true;
 					}*/
-					gl::color(1.0f, 0.0f, 1.0f);
+					color.assign(1.0f, 0.0f, 1.0f);
 				}
 			}
 	
+			gl::color(color);
 			draw_fragment(fragment, detail);
 		}
 
diff --git a/src/render/render.cc b/src/render/render.cc
index ce23645..e37f5f2 100644
--- a/src/render/render.cc
+++ b/src/render/render.cc
@@ -34,6 +34,7 @@ core::Cvar *r_sky = 0;
 core::Cvar *r_wireframe = 0;
 core::Cvar *r_mipmap = 0;
 core::Cvar *r_collision = 0;
+core::Cvar *r_normals = 0;
 
 void func_list_textures(std::string const &args)
 {
@@ -68,6 +69,9 @@ void init(int width, int height)
 	r_wireframe = core::Cvar::get("r_wireframe", "0", core::Cvar::Archive);
 	r_wireframe->set_info("[bool] render wireframe");
 
+	r_normals = core::Cvar::get("r_normals", "0", core::Cvar::Archive);
+	r_normals->set_info("[bool] render face normals");
+
 	r_grid = core::Cvar::get("r_grid", "0", core::Cvar::Archive);
 	r_grid->set_info("[bool] render the space grid");
 
diff --git a/src/render/render.h b/src/render/render.h
index 54205bc..a453464 100644
--- a/src/render/render.h
+++ b/src/render/render.h
@@ -48,6 +48,8 @@ namespace render {
 	extern core::Cvar *r_sky;
 	/// render wireframe models
 	extern core::Cvar *r_wireframe;
+	/// render vertex normals
+	extern core::Cvar *r_normals;
 	/// render collision
 	extern core::Cvar *r_collision;
 	/// use hardware generated mipmaps (requires OpenGL 1.4, does not work on all cards)