ShadowVolume: Well, it's a beginning...

levels/level.xml

@@ -40,6 +40,22 @@
         <vertex x="2.0" y="-2.0" z="2.0"/>
         <texcoords s="0.0" t="1.0"/>
       </triangle>
+      <triangle texture="t0">
+        <vertex x="2.0" y="-2.0" z="-2.0"/>
+        <texcoords s="1.0" t="1.0"/>
+        <vertex x="2.0" y="2.0" z="-2.0"/>
+        <texcoords s="1.0" t="0.0"/>
+        <vertex x="6.0" y="2.0" z="-2.0"/>
+        <texcoords s="0.0" t="0.0"/>
+      </triangle>
+      <triangle texture="t0">
+        <vertex x="2.0" y="-2.0" z="-2.0"/>
+        <texcoords s="1.0" t="1.0"/>
+        <vertex x="6.0" y="2.0" z="-2.0"/>
+        <texcoords s="0.0" t="0.0"/>
+        <vertex x="6.0" y="-2.0" z="-2.0"/>
+        <texcoords s="0.0" t="1.0"/>
+      </triangle>
       <triangle texture="t1">
         <vertex x="-2.0" y="2.0" z="-6.0"/>
         <texcoords s="0.0" t="1.0"/>

src/CMakeLists.txt

@@ -7,6 +7,7 @@ add_executable(zoom
   MathUtil.cpp MathUtil.h
   Renderer.cpp Renderer.h
   Shader.cpp Shader.h
+  ShadowVolume.cpp ShadowVolume.h
   Texture.cpp Texture.h
   Triangle.h
   zoom.cpp

src/Game.cpp

@@ -19,12 +19,13 @@
 
 #include "Game.h"
 
+#include "gl.h"
 #include "BSPTree.h"
 #include "Level.h"
 #include "Shader.h"
+#include "ShadowVolume.h"
 #include "Triangle.h"
 
-#include "gl.h"
 #include <algorithm>
 
 namespace Zoom {
@@ -34,17 +35,16 @@ Game::Game(bool multisample) : playerPos(vmml::vec3f::ZERO), playerRotY(vmml::ma
   glClearColor(0.0, 0.0, 0.0, 1.0);
   glClearDepth(1.0);
   glEnable(GL_DEPTH_TEST);
-  //glDepthFunc(GL_LEQUAL);
 
   glEnable(GL_BLEND);
-  //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
 #ifndef _WIN32
   if(multisample)
     glEnable(GL_MULTISAMPLE_ARB);
 #endif
 
-  glEnable(GL_LIGHTING);
+  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, vmml::vec4f(0.1, 0.1, 0.1, 1).array);
+
   glLightfv(GL_LIGHT0, GL_AMBIENT, vmml::vec4f::ZERO.array);
   glLightfv(GL_LIGHT0, GL_DIFFUSE, vmml::vec4f::ONE.array);
   glLightfv(GL_LIGHT0, GL_SPECULAR, vmml::vec4f::ONE.array);
@@ -142,17 +142,24 @@ void Game::render() {
 
   renderer.render(triangles);
 
-  /*glBegin(GL_LINES);
+  Shader::disable();
+  glDepthFunc(GL_LEQUAL);
+  glBlendFunc(GL_ONE, GL_ZERO);
 
-  glColor3f(0, 0, 1);
-  glVertex4f(-1, -0.5, -2, 1);
-  glVertex4f(1, -0.5, -2, 1);
+  glBegin(GL_LINES);
 
-  glColor3f(1, 0, 0);
-  glVertex4f(0, -0.5, -2, 1);
-  glVertex4f(1, 0, 0, 0);
+  glColor3f(1, 1, 0);
 
-  glEnd();*/
+  for(std::vector<BSPTree::TriangleRecord>::iterator t = triangles.begin(); t != triangles.end(); ++t) {
+    ShadowVolume v(t->triangle, light);
+
+    for(int i = 0; i < 3; ++i) {
+      glVertex3fv(v.getVertex(i).array);
+      glVertex3fv((v.getVertex(i)+v.getDirection(i)).array);
+    }
+  }
+
+  glEnd();
 }
 
 }

src/ShadowVolume.cpp

@@ -0,0 +1,45 @@
+/*
+ * ShadowVolume.cpp
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ShadowVolume.h"
+#include "MathUtil.h"
+
+namespace Zoom {
+
+ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) {
+  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;
+    }
+
+    return;
+  }
+
+  for(int i = 0; i < 3; ++i) {
+    rays[i].dir = rays[i].p - lightPos;
+  }
+}
+
+}

src/ShadowVolume.h

@@ -0,0 +1,51 @@
+/*
+ * ShadowVolume.h
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ZOOM_SHADOWVOLUME_H_
+#define ZOOM_SHADOWVOLUME_H_
+
+#include <vmmlib/vector.hpp>
+
+namespace Zoom {
+
+class Triangle;
+
+class ShadowVolume {
+  public:
+    ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos);
+    virtual ~ShadowVolume() {}
+
+    const vmml::vec3f& getVertex(int i) {
+      return rays[i].p;
+    }
+
+    const vmml::vec3f& getDirection(int i) {
+      return rays[i].dir;
+    }
+
+  private:
+    struct Ray {
+        vmml::vec3f p;
+        vmml::vec3f dir;
+    } rays[3];
+};
+
+}
+
+#endif /* ZOOM_SHADOWVOLUME_H_ */