Added nice lighting shaders

10 files changed, 283 insertions, 34 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6135c41..305c938 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,10 +5,11 @@ set(CMAKE_MODULE_PATH ${ZOOM_SOURCE_DIR})
 
 find_package(Boost REQUIRED)
 find_package(OpenGL REQUIRED)
+find_package(GLEW REQUIRED)
 find_package(GLPng REQUIRED)
 find_package(LibXml2 REQUIRED)
 
-include_directories(${Boost_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} ${GLPNG_INCLUDE_DIR} ${LIBXML2_INCLUDE_DIR})
+include_directories(${Boost_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} ${GLEW_INCLUDE_DIR} ${GLPNG_INCLUDE_DIR} ${LIBXML2_INCLUDE_DIR})
 
 add_executable(zoom
   BSPTree.cpp BSPTree.h
@@ -17,9 +18,10 @@ add_executable(zoom
   gl.h
   Level.cpp Level.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} ${GLPNG_LIBRARY} ${LIBXML2_LIBRARIES})
+target_link_libraries(zoom ${Boost_LIBRARIES} ${OPENGL_LIBRARIES} ${GLEW_LIBRARY} ${GLPNG_LIBRARY} ${LIBXML2_LIBRARIES})
diff --git a/FindGLEW.cmake b/FindGLEW.cmake
new file mode 100644
index 0000000..cf743e0
--- /dev/null
+++ b/FindGLEW.cmake
@@ -0,0 +1,16 @@
+FIND_PATH(GLEW_INCLUDE_DIR GL/glew.h)
+FIND_LIBRARY(GLEW_LIBRARY NAMES GLEW) 
+
+IF (GLEW_INCLUDE_DIR AND GLEW_LIBRARY)
+   SET(GLEW_FOUND TRUE)
+ENDIF (GLEW_INCLUDE_DIR AND GLEW_LIBRARY)
+
+IF (GLEW_FOUND)
+   IF (NOT GLEW_FIND_QUIETLY)
+      MESSAGE(STATUS "Found GLEW: ${GLEW_LIBRARY}")
+   ENDIF (NOT GLEW_FIND_QUIETLY)
+ELSE (GLEW_FOUND)
+   IF (GLEW_FIND_REQUIRED)
+      MESSAGE(FATAL_ERROR "Could not find GLEW")
+   ENDIF (GLEW_FIND_REQUIRED)
+ENDIF (GLEW_FOUND)
diff --git a/Game.cpp b/Game.cpp
index 46f942f..d948b2f 100644
--- a/Game.cpp
+++ b/Game.cpp
@@ -20,12 +20,13 @@
 #include "Game.h"
 #include "BSPTree.h"
 #include "Level.h"
+#include "Shader.h"
 #include "Triangle.h"
 #include "gl.h"
 
 namespace Zoom {
 
-Game::Game(bool multisample) : angle(0) {
+Game::Game(bool multisample) : angle(0), lightPos(0) {
   glClearColor(0.0, 0.0, 0.0, 1.0);
   glClearDepth(1.0);
   glEnable(GL_DEPTH_TEST);
@@ -42,19 +43,23 @@ Game::Game(bool multisample) : angle(0) {
   glShadeModel(GL_SMOOTH);
 
   glEnable(GL_LIGHTING);
-  static const float light[] = {0, 0, 0, 1};
-  static const float lightColor[] = {1, 1, 1, 1};
-  glLightfv(GL_LIGHT0, GL_POSITION, light);
-  glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor);
+  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);
+  glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0);
+  glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 0.3);
   glEnable(GL_LIGHT0);
 
   glEnable(GL_COLOR_MATERIAL);
   glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
 
+  glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, vmml::vec4f::ONE.array);
+  glMateriali(GL_FRONT_AND_BACK, GL_SHININESS, 128);
+
   glEnable(GL_CULL_FACE);
   glFrontFace(GL_CCW);
 
-  glLoadIdentity();
+  Shader::loadProgram("default.vert", "default.frag");
 
   loadLevel("level.xml");
 }
@@ -70,21 +75,46 @@ void Game::run(int delta) {
 
   if(angle >= 360)
     angle -= 360;
+
+  lightPos += delta;
+  lightPos %= 24000;
 }
 
 void Game::render() {
-  std::list<BSPTree::TriangleRecord> triangles;
+  int i;
+  float light[] = {0, 0, 0, 1};
+
+  if(lightPos < 12000) i = lightPos;
+  else i = 24000 - lightPos;
+
+  if(i < 4000) {
+    light[0] = 0.0;
+    light[2] = -i * 0.001;
+  }
+  else if(i < 8000) {
+    light[0] = (i-4000) * 0.001;
+    light[2] = -4.0;
+  }
+  else if(i < 12000) {
+    light[0] = 4.0;
+    light[2] = -4.0 - (i-8000) * 0.001;
+  }
+  else {
+    light[0] = 4.0;
+    light[2] = -8.0;
+  }
 
-  triangles.insert(triangles.end(), level->getRooms().front().walls.begin(), level->getRooms().front().walls.end());
+  glLightfv(GL_LIGHT0, GL_POSITION, light);
 
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix();
-  glRotatef(angle, 1, 2, 1);
-  //glRotatef(3*angle, 0, -1, 2);
-  //glRotatef(5*angle, 2, -1, 0);
+  //glRotatef(10, 1, 2, 1);
+  /*glRotatef(5*angle, 0, -1, 2);
+  glRotatef(7*angle, 2, -1, 0);
+  glRotatef(11*angle, 2, -1, 2);*/
 
-  renderer.render(triangles);
+  renderer.render(level->getRooms().front().walls);
 
   glPopMatrix();
 }
diff --git a/Game.h b/Game.h
index 7960497..f651125 100644
--- a/Game.h
+++ b/Game.h
@@ -43,6 +43,7 @@ class Game {
     boost::shared_ptr<Level> level;
 
     float angle;
+    int lightPos;
 };
 
 }
diff --git a/Shader.cpp b/Shader.cpp
new file mode 100644
index 0000000..420b6c6
--- /dev/null
+++ b/Shader.cpp
@@ -0,0 +1,95 @@
+/*
+ * Shader.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 "Shader.h"
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <boost/scoped_array.hpp>
+
+namespace Zoom {
+
+bool Shader::loadProgram(const std::string &vertexShader, const std::string &fragmentShader) {
+  GLhandleARB program, vs = 0, fs = 0;
+
+  if(!vertexShader.empty())
+    vs = loadShader(vertexShader, GL_VERTEX_SHADER_ARB);
+
+  if(!fragmentShader.empty())
+    fs = loadShader(fragmentShader, GL_FRAGMENT_SHADER_ARB);
+
+  program = glCreateProgramObjectARB();
+
+  if(vs)
+    glAttachObjectARB(program, vs);
+
+  if(fs)
+    glAttachObjectARB(program, fs);
+
+  glLinkProgramARB(program);
+  printInfoLog(program);
+
+  glUseProgramObjectARB(program);
+
+  return true;
+}
+
+GLhandleARB Shader::loadShader(const std::string &name, GLenum type) {
+  std::vector<std::string> lines;
+  std::ifstream file(("shader/" + name).c_str(), std::ios_base::in);
+  if(!file.good())
+    throw std::ios::failure("Can't read file '" + name + "'");
+
+  while(file.good() && !file.eof()) {
+    std::string line;
+    std::getline(file, line);
+
+    if(!line.empty())
+      lines.push_back(line);
+  }
+
+  boost::scoped_array<const char *> strings(new const char*[lines.size()]);
+  for(std::size_t i = 0; i < lines.size(); ++i) {
+    strings[i] = lines[i].c_str();
+  }
+
+  GLhandleARB shader = glCreateShaderObjectARB(type);
+  glShaderSourceARB(shader, lines.size(), strings.get(), 0);
+  glCompileShaderARB(shader);
+  printInfoLog(shader);
+
+  return shader;
+}
+
+void Shader::printInfoLog(GLhandleARB obj) {
+  int length = 0;
+
+  glGetObjectParameterivARB(obj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
+
+  if(length > 0) {
+    boost::scoped_array<char> log(new char[length]);
+
+    int foo;
+    glGetInfoLogARB(obj, length, &foo, log.get());
+    std::cerr << log.get() << std::endl;
+  }
+}
+
+
+}
diff --git a/Shader.h b/Shader.h
new file mode 100644
index 0000000..8111f0c
--- /dev/null
+++ b/Shader.h
@@ -0,0 +1,41 @@
+/*
+ * Shader.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_SHADER_H_
+#define ZOOM_SHADER_H_
+
+#include "gl.h"
+#include <string>
+
+namespace Zoom {
+
+class Shader {
+  public:
+    static bool loadProgram(const std::string &vertexShader, const std::string &fragmentShader);
+
+  private:
+    Shader();
+
+    static GLhandleARB loadShader(const std::string &name, GLenum type);
+    static void printInfoLog(GLhandleARB obj);
+};
+
+}
+
+#endif /* ZOOM_SHADER_H_ */
diff --git a/gl.h b/gl.h
index 22e0523..3272b25 100644
--- a/gl.h
+++ b/gl.h
@@ -25,6 +25,7 @@
 #include <windows.h>
 #endif
 
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glu.h>
 
diff --git a/shader/default.frag b/shader/default.frag
new file mode 100644
index 0000000..b39b46d
--- /dev/null
+++ b/shader/default.frag
@@ -0,0 +1,44 @@
+uniform sampler2D tex;
+
+varying vec4 diffuse, ambientGlobal, ambient;
+varying vec3 normal, pos;
+/*varying vec3 normal, lightVector, reflectVector, eyeVector;*/
+
+
+void main() {
+  vec3 n, l, refl, eye;
+  float NdotL, RdotE;
+  vec4 color, specularColor;
+  float dist, att, specularFactor;
+  
+  color = ambientGlobal;
+  
+  n = normalize(normal);
+  
+  l = gl_LightSource[0].position.xyz - pos;
+  
+  dist = length(l);
+  l /= dist;
+  
+  /* compute the dot product between normal and normalized lightdir */
+  NdotL = max(dot(n, l), 0.0);
+
+  if (NdotL > 0.0) {
+    att = 1.0 / (gl_LightSource[0].constantAttenuation +
+        gl_LightSource[0].linearAttenuation * dist +
+        gl_LightSource[0].quadraticAttenuation * dist * dist);
+    color += att * (diffuse * NdotL + ambient);
+    
+    refl = normalize(reflect(-l, n));
+    eye = normalize(-pos);
+    
+    RdotE = max(dot(refl, eye), 0.0);
+    specularFactor = att * pow(RdotE, gl_FrontMaterial.shininess);
+    specularColor = specularFactor * gl_FrontMaterial.specular * gl_LightSource[0].specular;
+  }
+  else {
+    specularColor = vec4(0, 0, 0, 1);
+  }
+  
+  gl_FragColor = color * texture2D(tex, gl_TexCoord[0].st) + specularColor;
+}
diff --git a/shader/default.vert b/shader/default.vert
new file mode 100644
index 0000000..133c871
--- /dev/null
+++ b/shader/default.vert
@@ -0,0 +1,25 @@
+varying vec4 diffuse, ambientGlobal, ambient;
+varying vec3 normal, pos;
+/*varying vec3 normal, lightVector, reflectVector, eyeVector;*/
+
+
+void main() {
+  normal = normalize(gl_NormalMatrix * gl_Normal);
+  
+  pos = vec3(gl_ModelViewMatrix * gl_Vertex);
+  /*lightVector = vec3(gl_LightSource[0].position - ecPos);
+  
+  reflectVector = normalize(reflect(-lightVector, normal));
+  eyeVector = vec3(-ecPos);*/
+  
+  /* Compute the diffuse, ambient and globalAmbient terms */
+  diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
+  
+  /* The ambient terms have been separated since one of them */
+  /* suffers attenuation */
+  ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
+  ambientGlobal = gl_LightModel.ambient * gl_FrontMaterial.ambient;
+  
+  gl_TexCoord[0] = gl_MultiTexCoord0;
+  gl_Position = ftransform();
+}
diff --git a/zoom.cpp b/zoom.cpp
index 8f01c1b..6fab527 100644
--- a/zoom.cpp
+++ b/zoom.cpp
@@ -66,8 +66,7 @@ bool WGLInit(HINSTANCE hInstance, HWND *hWnd, HDC *hDC, HGLRC *hRC) {
   wc.lpszMenuName = 0;
   wc.lpszClassName = "3D";
 
-  if (!RegisterClass(&wc))
-  {
+  if (!RegisterClass(&wc)) {
     MessageBox(0, "Failed To Register The Window Class.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;             // Exit And Return FALSE
   }
@@ -85,14 +84,12 @@ bool WGLInit(HINSTANCE hInstance, HWND *hWnd, HDC *hDC, HGLRC *hRC) {
 
   *hWnd = CreateWindowEx(dwExStyle, "3D" /* Class Name */, "3D" /* Title*/, WS_CLIPSIBLINGS | WS_CLIPCHILDREN | dwStyle,
                         0, 0, windowRect.right-windowRect.left, windowRect.bottom-windowRect.top, 0, 0, hInstance, 0);
-  if(!*hWnd)
-  {
+  if(!*hWnd) {
     MessageBox(0, "Window Creation Error.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
   }
 
-  static PIXELFORMATDESCRIPTOR pfd =
-  {
+  static PIXELFORMATDESCRIPTOR pfd = {
       sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
       1,                             // Version Number
       PFD_DRAW_TO_WINDOW |           // Format Must Support Window
@@ -114,38 +111,33 @@ bool WGLInit(HINSTANCE hInstance, HWND *hWnd, HDC *hDC, HGLRC *hRC) {
   };
 
   *hDC=GetDC(*hWnd);
-  if (!*hDC)
-  {
+  if (!*hDC) {
     WGLUninit(*hWnd, 0, 0);
     MessageBox(0, "Can't Create A GL Device Context.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
   }
 
   GLuint pixelFormat = ChoosePixelFormat(*hDC, &pfd);
-  if(!pixelFormat)
-  {
+  if(!pixelFormat) {
     WGLUninit(*hWnd, *hDC, 0);
     MessageBox(0, "Can't Find A Suitable PixelFormat.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
   }
 
-  if(!SetPixelFormat(*hDC, pixelFormat, &pfd))
-  {
+  if(!SetPixelFormat(*hDC, pixelFormat, &pfd)) {
     WGLUninit(*hWnd, *hDC, 0);
     MessageBox(0, "Can't Set The PixelFormat.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
   }
 
   *hRC=wglCreateContext(*hDC);
-  if(!*hRC)
-  {
+  if(!*hRC) {
     WGLUninit(*hWnd, *hDC, 0);
     MessageBox(0, "Can't Create A GL Rendering Context.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
   }
 
-  if(!wglMakeCurrent(*hDC, *hRC))
-  {
+  if(!wglMakeCurrent(*hDC, *hRC)) {
     WGLUninit(*hWnd, *hDC, *hRC);
     MessageBox(0, "Can't Activate The GL Rendering Context.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
     return false;
@@ -171,17 +163,17 @@ void WGLUninit(HWND hWnd, HDC hDC, HGLRC hRC) {
     DestroyWindow(hWnd);
 }
 
-int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
-{
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
   HWND hWnd = 0;
   HDC hDC = 0;
   HGLRC hRC = 0;
 
-  if(!WGLInit(hInstance, &hWnd, &hDC, &hRC))
-  {
+  if(!WGLInit(hInstance, &hWnd, &hDC, &hRC)) {
     return 0;
   }
 
+  glewInit();
+
   resize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
 
   bool running = true;
@@ -330,6 +322,8 @@ int main() {
   if(!GLXinit(disp, windele, &wnd, &gc, &multisample))
     return 1;
 
+  glewInit();
+
   resize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
 
   Zoom::Game game(multisample);