From ea08fea654b4702a77f623b74137fabc7d6800d8 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Wed, 16 Dec 2009 14:58:56 +0100
Subject: Use perspective projection matrix without far clipping plane.

---
 CMakeLists.txt     |  6 +++++-
 src/CMakeLists.txt |  3 ++-
 src/Game.cpp       |  4 +++-
 src/MathUtil.cpp   | 38 ++++++++++++++++++++++++++++++++++++++
 src/MathUtil.h     | 37 +++++++++++++++++++++++++++++++++++++
 src/gl.h           |  1 -
 src/zoom.cpp       |  5 +++--
 7 files changed, 88 insertions(+), 6 deletions(-)
 create mode 100644 src/MathUtil.cpp
 create mode 100644 src/MathUtil.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a57452..af00fd4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,11 @@ project(ZOOM)
 set(CMAKE_MODULE_PATH ${ZOOM_SOURCE_DIR})
 
 find_package(Boost REQUIRED)
-find_package(OpenGL REQUIRED)
+find_package(OpenGL)
+IF (NOT OPENGL_FOUND)
+  MESSAGE(FATAL_ERROR "Could not find OpenGL")
+ENDIF (NOT OPENGL_FOUND)
+
 find_package(GLEW REQUIRED)
 find_package(GLPng REQUIRED)
 find_package(LibXml2 REQUIRED)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e1c9378..6b56713 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,10 +4,11 @@ add_executable(zoom
   config.h
   gl.h
   Level.cpp Level.h
+  MathUtil.cpp MathUtil.h
   Renderer.cpp Renderer.h
   Shader.cpp Shader.h
   Texture.cpp Texture.h
   Triangle.h
   zoom.cpp
 )
-target_link_libraries(zoom ${Boost_LIBRARIES} ${OPENGL_LIBRARIES} ${GLEW_LIBRARY} ${GLPNG_LIBRARY} ${LIBXML2_LIBRARIES})
+target_link_libraries(zoom ${Boost_LIBRARIES} ${OPENGL_gl_LIBRARY} ${GLEW_LIBRARY} ${GLPNG_LIBRARY} ${LIBXML2_LIBRARIES})
diff --git a/src/Game.cpp b/src/Game.cpp
index d4991ed..487019c 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -18,10 +18,12 @@
  */
 
 #include "Game.h"
+
 #include "BSPTree.h"
 #include "Level.h"
 #include "Shader.h"
 #include "Triangle.h"
+
 #include "gl.h"
 #include <algorithm>
 
@@ -61,7 +63,7 @@ Game::Game(bool multisample) : playerPos(vmml::vec3f::ZERO), playerRot(vmml::mat
 
   Shader::loadProgram("default.vert", "default.frag");
 
-  playerRot.rotate_y(M_PI/6);
+  playerRot.rotate_y(-M_PI/6);
 
   loadLevel("level.xml");
   triangles.insert(triangles.end(), level->getRooms().front().walls.begin(), level->getRooms().front().walls.end());
diff --git a/src/MathUtil.cpp b/src/MathUtil.cpp
new file mode 100644
index 0000000..3905450
--- /dev/null
+++ b/src/MathUtil.cpp
@@ -0,0 +1,38 @@
+/*
+ * MathUtil.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 "MathUtil.h"
+#include <cmath>
+
+namespace Zoom {
+
+vmml::mat4f MathUtil::perspective(float fovy, float aspect, float zNear) {
+  float f = 1/std::tan(fovy*M_PI/360);
+
+  vmml::mat4f ret(vmml::mat4f::ZERO);
+  ret[0][0] = f/aspect;
+  ret[1][1] = f;
+  ret[2][2] = -1;
+  ret[2][3] = -2*zNear;
+  ret[3][2] = -1;
+
+  return ret;
+}
+
+}
diff --git a/src/MathUtil.h b/src/MathUtil.h
new file mode 100644
index 0000000..2376c2d
--- /dev/null
+++ b/src/MathUtil.h
@@ -0,0 +1,37 @@
+/*
+ * MathUtil.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_MATHUTIL_H_
+#define ZOOM_MATHUTIL_H_
+
+#include <vmmlib/matrix.hpp>
+
+namespace Zoom {
+
+class MathUtil {
+  public:
+    static vmml::mat4f perspective(float fovy, float aspect, float zNear);
+
+  private:
+    MathUtil();
+};
+
+}
+
+#endif /* ZOOM_MATHUTIL_H_ */
diff --git a/src/gl.h b/src/gl.h
index 3272b25..cc71ce8 100644
--- a/src/gl.h
+++ b/src/gl.h
@@ -27,6 +27,5 @@
 
 #include <GL/glew.h>
 #include <GL/gl.h>
-#include <GL/glu.h>
 
 #endif /* ZOOM_GL_H_ */
diff --git a/src/zoom.cpp b/src/zoom.cpp
index d9df6d4..b222286 100644
--- a/src/zoom.cpp
+++ b/src/zoom.cpp
@@ -18,9 +18,11 @@
  */
 
 #include "Game.h"
+#include "MathUtil.h"
 #include "config.h"
 #include "gl.h"
 
+
 #ifdef _WIN32
 #else
 #include <iostream>
@@ -38,8 +40,7 @@ void resize(int width, int height)
 
 
   glMatrixMode(GL_PROJECTION);
-  glLoadIdentity();
-  gluPerspective(50.0f, (GLfloat)width/(GLfloat)height, 0.1, 1000);
+  glLoadMatrixf(Zoom::MathUtil::perspective(50.0f, (float)width/(float)height, 0.1).array);
 
   glMatrixMode(GL_MODELVIEW);
 
-- 
cgit v1.2.3