From 6d3965b35edf5f03cd065d42af31867acf1f4637 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Thu, 24 Dec 2009 02:47:35 +0100
Subject: Make shadow volumes visible

---
 src/ShadowVolume.cpp | 36 +++++++++++++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 5 deletions(-)

(limited to 'src/ShadowVolume.cpp')

diff --git a/src/ShadowVolume.cpp b/src/ShadowVolume.cpp
index b0c25ca..67a44db 100644
--- a/src/ShadowVolume.cpp
+++ b/src/ShadowVolume.cpp
@@ -20,19 +20,19 @@
 #include "ShadowVolume.h"
 #include "MathUtil.h"
 
+#include "gl.h"
+
 namespace Zoom {
 
-ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) {
+ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) : visible(true) {
   MathUtil::Plane trianglePlane(t);
 
   for(int i = 0; i < 3; ++i) {
     rays[i].p = t.getVertex(i);
   }
 
-  if(trianglePlane.isBehind(lightPos)) {
-    for(int i = 0; i < 3; ++i) {
-      rays[i].dir = vmml::vec3f::ZERO;
-    }
+  if(trianglePlane.isInFront(lightPos)) {
+    visible = false;
 
     return;
   }
@@ -42,4 +42,30 @@ ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) {
   }
 }
 
+void ShadowVolume::render() const {
+  if(!visible)
+    return;
+
+  glVertex3fv(rays[0].p.array);
+  glVertex3fv(rays[1].p.array);
+  glVertex3fv(rays[2].p.array);
+
+  for(int i = 0; i < 3; ++i) {
+    const Ray &r1 = rays[i];
+    const Ray &r2 = rays[(i+1)%3];
+
+    glVertex3fv(r1.p.array);
+    glVertex4fv(vmml::vec4f(r1.dir, 0).array);
+    glVertex3fv(r2.p.array);
+
+    glVertex3fv(r2.p.array);
+    glVertex4fv(vmml::vec4f(r1.dir, 0).array);
+    glVertex4fv(vmml::vec4f(r2.dir, 0).array);
+  }
+
+  glVertex4fv(vmml::vec4f(rays[2].dir, 0).array);
+  glVertex4fv(vmml::vec4f(rays[1].dir, 0).array);
+  glVertex4fv(vmml::vec4f(rays[0].dir, 0).array);
+}
+
 }
-- 
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