[Add] Initial map scrolling.

Bin/VC10/VC10.vcxproj

@@ -124,6 +124,7 @@
   <ItemGroup>
     <ClCompile Include="..\..\src\Actor\Player.cpp" />
     <ClCompile Include="..\..\src\Collision\AABB.cpp" />
+    <ClCompile Include="..\..\src\Global\Constants.cpp" />
     <ClCompile Include="..\..\src\Global\Globals.cpp" />
     <ClCompile Include="..\..\src\IO\Input.cpp" />
     <ClCompile Include="..\..\src\Level\Layer.cpp" />

Bin/VC10/VC10.vcxproj.filters

@@ -236,5 +236,8 @@
     <ClCompile Include="..\..\src\Level\Tileset.cpp">
       <Filter>Level</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\Global\Constants.cpp">
+      <Filter>Global</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>

LibDQt/LibDQt.pro

@@ -46,6 +46,7 @@ HEADERS += ../src/Actor/Player.h \
     ../src/TMXParser/TmxUtil.h
 SOURCES += ../src/Actor/Player.cpp \
     ../src/Global/Globals.cpp \
+    ../src/Global/Constants.cpp \
     ../src/IO/Input.cpp \
     ../src/Main/main.cpp \
     ../src/Main/LGLXWindow.cpp \

src/Actor/Player.h

@@ -16,6 +16,9 @@ public:
   void Render(void);
   void ProcessEvents(void);
 
+  int GetX() { return x; }
+  int GetY() { return y; }
+
 private:
   float x;
   float y;

src/Global/Constants.cpp

@@ -0,0 +1,10 @@
+#include "Constants.h"
+
+const int WINDOW_WIDTH        = 800;
+const int WINDOW_HEIGHT       = 600;
+const int WINDOW_BPP          = 16;
+const int WINDOW_FULLSCREEN   = 0;
+
+const SDL_VideoInfo* info     = NULL;
+
+int flags                     = 0;

src/Global/Constants.h

@@ -1,11 +1,11 @@
 #pragma once
 #include <SDL/SDL.h>
 
-const int WINDOW_WIDTH        = 800;
+extern const int WINDOW_WIDTH;
-const int WINDOW_HEIGHT       = 600;
+extern const int WINDOW_HEIGHT;
-const int WINDOW_BPP          = 16;
+extern const int WINDOW_BPP;
-const int WINDOW_FULLSCREEN   = false;
+extern const int WINDOW_FULLSCREEN;
 
-const SDL_VideoInfo* info     = NULL;
+extern const SDL_VideoInfo* info;
 
-int flags                     = 0;
+extern int flags;

src/Level/Layer.cpp

@@ -1,5 +1,6 @@
 #include "Layer.h"
 #include "Tileset.h"
+#include "../Global/Constants.h"
 
 Layer::Layer(int width, int height, int tileWidth, int tileHeight) {
   _width = width;
@@ -20,7 +21,15 @@ void Layer::Update(float dt) {
   }
 }
 
-void Layer::Draw() {
+void Layer::Draw(int xOffset, int yOffset) {
+  int xOffsetTiles = xOffset / _width;
+  int yOffsetTiles = yOffset / _height;
+
+  int minX = std::max(0, xOffsetTiles - 1);
+  int maxX = std::min(_width, xOffsetTiles + (WINDOW_WIDTH / (int)_tileWidth) + 1);
+  int minY = std::max(0, yOffsetTiles - 1);
+  int maxY = std::min(_height, yOffsetTiles + (WINDOW_HEIGHT / (int)_tileHeight) + 1);
+  
   for(int x = 0; x < _width; x++) {
     for(int y = 0; y < _height; y++) {
       MapTile& tile = GetTile(x, y);

src/Level/Layer.h

@@ -8,7 +8,7 @@ public:
   ~Layer();
 
   void Update(float dt);
-  void Draw();
+  void Draw(int xOffset, int yOffset);
 
   int GetWidth() const { return _width; }
   int GetHeight() const { return _height; }

src/Level/Level.cpp

@@ -1,4 +1,5 @@
 #include <map>
+#include <algorithm>
 #include "Level.h"
 #include "Layer.h"
 #include "Tileset.h"
@@ -78,8 +79,8 @@ bool Level::Load(const std::string& filename) {
   return true;
 }
 
-void Level::Draw() {
+void Level::Draw(int xOffset, int yOffset) {
   for(std::list<Layer*>::iterator i = _layers.begin(); i != _layers.end(); ++i) {
-    (*i)->Draw();
+    (*i)->Draw(xOffset, yOffset);
   }
 }

src/Level/Level.h

@@ -14,7 +14,7 @@ public:
   bool Load(const std::string& filename);
 
   void Update(float dt);
-  void Draw();
+  void Draw(int xOffset, int yOffset);
 
   int GetWidth() const { return _width; }
   int GetHeight() const { return _height; }

src/Main/Game.cpp

@@ -52,9 +52,13 @@ void Game::Render(void) {
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
 
+  glTranslatef(-(_player->GetX() - 256), -(_player->GetY() - 128), 0.0f);
+
   // Render our shit..
-  _level->Draw();
+  _level->Draw(_player->GetX() - 256, _player->GetY() - 128);
   _player->Render();
+
+  glPopMatrix();
 }
 
 void Game::Shutdown(void) {