From d702c133c06cd9626430263292df69b092954c5f Mon Sep 17 00:00:00 2001
From: Evan Goers <mega@osirion.org>
Date: Sat, 21 Jan 2012 03:19:55 +0000
Subject: Add a 'decal' macro material flag. Material flag 'Decal' enables
 polygon offsetting and alpha testing on the surface.

---
 src/render/state.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/render/state.cc')

diff --git a/src/render/state.cc b/src/render/state.cc
index 09e1a59..ffff7e3 100644
--- a/src/render/state.cc
+++ b/src/render/state.cc
@@ -219,6 +219,14 @@ void State::use_material(const model::Material * material) {
 		gl::color(color);
 		return;
 	}
+
+	// Decal macro
+	if (material->flags() & model::Material::Decal) {
+		gl::enable(GL_POLYGON_OFFSET_FILL);
+		gl::enable(GL_ALPHA_TEST);
+		glPolygonOffset(-1,-1);
+		glAlphaFunc(GL_GEQUAL, 0.5f);
+	}
 	
 	// assign the opengl drawing color according to material flags
 	if (material->flags() & model::Material::Engine) {
@@ -312,6 +320,8 @@ void State::use_material(const model::Material * material) {
 }
 
 void State::reset() {
+	gl::disable(GL_POLYGON_OFFSET_FILL);
+	gl::disable(GL_ALPHA_TEST);
 	gl::disable(GL_TEXTURE_GEN_S);
 	gl::disable(GL_TEXTURE_GEN_T);
 	gl::disable(GL_TEXTURE_GEN_R);
-- 
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