Use multi-pass rendering with seperate ambient and light shaders

shader/ambient.frag

@@ -0,0 +1,8 @@
+uniform sampler2D tex;
+
+varying vec4 ambient;
+
+
+void main() {
+  gl_FragColor = ambient * texture2D(tex, gl_TexCoord[0].st);
+}

shader/ambient.vert

@@ -0,0 +1,8 @@
+varying vec4 ambient;
+
+void main() {
+  ambient = gl_LightModel.ambient * gl_FrontMaterial.ambient;
+  
+  gl_TexCoord[0] = gl_MultiTexCoord0;
+  gl_Position = ftransform();
+}

shader/light.frag

@@ -1,6 +1,6 @@
 uniform sampler2D tex;
 
-varying vec4 diffuse, ambientGlobal, ambient;
+varying vec4 diffuse, ambient;
 varying vec3 normal, pos;
 
 
@@ -10,8 +10,6 @@ void main() {
   vec4 color, specularColor;
   float dist, att, specularFactor;
   
-  color = ambientGlobal;
-  
   n = normalize(normal);
   
   l = gl_LightSource[0].position.xyz - pos;
@@ -26,7 +24,7 @@ void main() {
     att = 1.0 / (gl_LightSource[0].constantAttenuation +
         gl_LightSource[0].linearAttenuation * dist +
         gl_LightSource[0].quadraticAttenuation * dist * dist);
-    color += att * (diffuse * NdotL + ambient);
+    color = att * (diffuse * NdotL + ambient);
     
     refl = normalize(reflect(-l, n));
     eye = normalize(-pos);
@@ -34,10 +32,10 @@ void main() {
     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;
   }
+  else {
+    gl_FragColor = vec4(0, 0, 0, 1);
+  }
+}

shader/light.vert

@@ -1,4 +1,4 @@
-varying vec4 diffuse, ambientGlobal, ambient;
+varying vec4 diffuse, ambient;
 varying vec3 normal, pos;
 
 
@@ -10,7 +10,6 @@ void main() {
   diffuse = gl_FrontMaterial.diffuse * gl_LightSource[0].diffuse;
   
   ambient = gl_FrontMaterial.ambient * gl_LightSource[0].ambient;
-  ambientGlobal = gl_LightModel.ambient * gl_FrontMaterial.ambient;
   
   gl_TexCoord[0] = gl_MultiTexCoord0;
   gl_Position = ftransform();

src/Game.cpp

@@ -34,9 +34,9 @@ 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);
+  //glDepthFunc(GL_LEQUAL);
 
-  //glEnable(GL_BLEND);
+  glEnable(GL_BLEND);
   //glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
 #ifndef _WIN32
@@ -50,7 +50,7 @@ Game::Game(bool multisample) : playerPos(vmml::vec3f::ZERO), playerRotY(vmml::ma
   glLightfv(GL_LIGHT0, GL_SPECULAR, vmml::vec4f::ONE.array);
   glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0);
   glLightf(GL_LIGHT0, GL_QUADRATIC_ATTENUATION, 0.2);
-  glEnable(GL_LIGHT0);
+  glDisable(GL_LIGHT0);
 
   glEnable(GL_COLOR_MATERIAL);
   glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
@@ -61,8 +61,6 @@ Game::Game(bool multisample) : playerPos(vmml::vec3f::ZERO), playerRotY(vmml::ma
   glEnable(GL_CULL_FACE);
   glFrontFace(GL_CCW);
 
-  Shader::loadProgram("default.vert", "default.frag");
-
   loadLevel("level.xml");
   triangles.insert(triangles.end(), level->getRooms().front().walls.begin(), level->getRooms().front().walls.end());
   std::sort(triangles.begin(), triangles.end(), Renderer::TextureSorter());

src/Renderer.cpp

@@ -18,9 +18,15 @@
  */
 
 #include "Renderer.h"
+#include "Shader.h"
 
 namespace Zoom {
 
+Renderer::Renderer() : activeTexture(0), renderVisitor(this) {
+  ambientShader = boost::shared_ptr<Shader>(Shader::load("ambient.vert", "ambient.frag"));
+  lightShader = boost::shared_ptr<Shader>(Shader::load("light.vert", "light.frag"));
+}
+
 void Renderer::render(const BSPTree &tree) {
   vmml::mat4f transform, inverseTransform;
   glGetFloatv(GL_MODELVIEW_MATRIX, transform.array);

src/Renderer.h

@@ -20,19 +20,25 @@
 #ifndef ZOOM_RENDERER_H_
 #define ZOOM_RENDERER_H_
 
-#include "BSPTree.h"
 #include "gl.h"
+#include "BSPTree.h"
+#include "Shader.h"
+
 
 namespace Zoom {
 
 class Renderer {
   public:
-    Renderer() : activeTexture(0), renderVisitor(this) {}
+    Renderer();
 
     void render(const BSPTree &tree);
 
     template <typename T>
     void render(const T &triangles) {
+      Shader::enable(ambientShader);
+      glBlendFunc(GL_ONE, GL_ZERO);
+      glDepthFunc(GL_LEQUAL);
+
       typename T::const_iterator t = triangles.begin();
       if(t == triangles.end())
         return;
@@ -44,6 +50,20 @@ class Renderer {
         renderTriangle(t->triangle);
       }
       glEnd();
+
+      Shader::enable(lightShader);
+      glBlendFunc(GL_ONE, GL_ONE);
+      glDepthFunc(GL_EQUAL);
+
+      t = triangles.begin();
+
+      useTexture(t->triangle.getTexture());
+
+      glBegin(GL_TRIANGLES);
+      for(; t != triangles.end(); ++t) {
+        renderTriangle(t->triangle);
+      }
+      glEnd();
     }
 
     struct TextureSorter {
@@ -68,6 +88,7 @@ class Renderer {
         Renderer *renderer;
     };
 
+    boost::shared_ptr<Shader> ambientShader, lightShader;
     unsigned activeTexture;
 
     const RenderVisitor renderVisitor;

src/Shader.cpp

@@ -18,6 +18,7 @@
  */
 
 #include "Shader.h"
+
 #include <iostream>
 #include <fstream>
 #include <vector>
@@ -25,8 +26,9 @@
 
 namespace Zoom {
 
-bool Shader::loadProgram(const std::string &vertexShader, const std::string &fragmentShader) {
+boost::shared_ptr<Shader> Shader::load(const std::string &vertexShader, const std::string &fragmentShader) {
   GLhandleARB program, vs = 0, fs = 0;
+  bool ok = false;
 
   if(!vertexShader.empty())
     vs = loadShader(vertexShader, GL_VERTEX_SHADER_ARB);
@@ -36,6 +38,7 @@ bool Shader::loadProgram(const std::string &vertexShader, const std::string &fra
 
   program = glCreateProgramObjectARB();
 
+  if(program) {
     if(vs)
       glAttachObjectARB(program, vs);
 
@@ -43,18 +46,33 @@ bool Shader::loadProgram(const std::string &vertexShader, const std::string &fra
       glAttachObjectARB(program, fs);
 
     glLinkProgramARB(program);
+    if(glGetError()) {
       printInfoLog(program);
+    }
+    else {
+      ok = true;
+    }
 
-  glUseProgramObjectARB(program);
+    if(vs) {
+      glDeleteObjectARB(vs);
+    }
 
-  return true;
+    if(fs) {
+      glDeleteObjectARB(fs);
+    }
+  }
+
+  if(ok)
+    return boost::shared_ptr<Shader>(new Shader(program));
+  else
+    return boost::shared_ptr<Shader>();
 }
 
 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 + "'");
+    return 0;
 
   while(file.good() && !file.eof()) {
     std::string line;
@@ -69,12 +87,26 @@ GLhandleARB Shader::loadShader(const std::string &name, GLenum type) {
     strings[i] = lines[i].c_str();
   }
 
+  bool ok = false;
   GLhandleARB shader = glCreateShaderObjectARB(type);
+
+  if(shader) {
     glShaderSourceARB(shader, lines.size(), strings.get(), 0);
     glCompileShaderARB(shader);
+    if(glGetError()) {
       printInfoLog(shader);
 
+      glDeleteObjectARB(shader);
+    }
+    else {
+      ok = true;
+    }
+  }
+
+  if(ok)
     return shader;
+  else
+    return 0;
 }
 
 void Shader::printInfoLog(GLhandleARB obj) {

src/Shader.h

@@ -21,19 +21,42 @@
 #define ZOOM_SHADER_H_
 
 #include "gl.h"
+
 #include <string>
+#include <boost/shared_ptr.hpp>
 
 namespace Zoom {
 
 class Shader {
   public:
-    static bool loadProgram(const std::string &vertexShader, const std::string &fragmentShader);
+    static boost::shared_ptr<Shader> load(const std::string &vertexShader, const std::string &fragmentShader);
+
+    static void enable(boost::shared_ptr<Shader> shader) {
+      if(shader)
+        glUseProgramObjectARB(shader->handle);
+      else
+        glUseProgramObjectARB(0);
+    }
+
+    static void disable() {
+      enable(boost::shared_ptr<Shader>());
+    }
+
+    ~Shader() {
+      glDeleteObjectARB(handle);
+    }
 
   private:
-    Shader();
-
     static GLhandleARB loadShader(const std::string &name, GLenum type);
     static void printInfoLog(GLhandleARB obj);
+
+    Shader(GLhandleARB handle0) : handle(handle0) {}
+
+    // Prevent shallow copy
+    Shader(const Shader &o);
+    Shader& operator=(const Shader &o);
+
+    GLhandleARB handle;
 };
 
 }

src/zoom.cpp

@@ -22,6 +22,8 @@
 #include "config.h"
 #include "gl.h"
 
+#include <cstdio>
+
 
 #ifdef _WIN32
 #else
@@ -69,7 +71,7 @@ bool WGLInit(HINSTANCE hInstance, HWND *hWnd, HDC *hDC, HGLRC *hRC) {
 
   if (!RegisterClass(&wc)) {
     MessageBox(0, "Failed To Register The Window Class.", "ERROR", MB_OK|MB_ICONEXCLAMATION);
-    return false;             // Exit And Return FALSE
+    return false;
   }
 
   DWORD dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
@@ -421,11 +423,14 @@ int main() {
 
         case GenericEvent:
           if(event.xcookie.extension == xi_opcode && XGetEventData(disp, &event.xcookie)) {
+            switch(event.xcookie.evtype) {
+              case XI_RawMotion:
                 XIRawEvent *rawEvent = reinterpret_cast<XIRawEvent*>(event.xcookie.data);
 
                 float deltaX = 0, deltaY = 0;
                 double *rawValuator = rawEvent->raw_values;
 
+                if(rawEvent->valuators.mask_len >= 1) {
                   if(XIMaskIsSet(rawEvent->valuators.mask, 0)) {
                     deltaX = (float)*rawValuator;
                     ++rawValuator;
@@ -435,9 +440,11 @@ int main() {
                     deltaY = (float)*rawValuator;
                     ++rawValuator;
                   }
+                }
 
                 if(deltaX != 0 || deltaY != 0)
                   game.turn(deltaX, deltaY);
+            }
 
             XFreeEventData(disp, &event.xcookie);
           }