SDL2 遊戲開發日誌（二）

構建框架：場景，渲染。

負責載入和渲染，它將可以新增到指定的【場景】中，當【場景】被【場景管理類】呼叫時，它將每一幀都被呼叫和更新。

#pragma once

#include #include using namespace std;
class renderable
virtual ~renderable()
if (mrenderrect != null)
if (mcliprect != null)
} void setlayer(int layer)
int getlayer()
virtual bool loadtexture(string filename);
void setpos(int x,int y)
} bool isdeleted()
void delete()
bool isvisible()
void setvisible(bool visible)
virtual void update(float time_step){}
virtual void render();
int getwidth()
int getheight()
};bool renderable::loadtexture(string filename)
sdl_su***ce *su***ce = img_load(filename.c_str());
if (su***ce != null)
sdl_freesu***ce(su***ce);
} return bresult;
}void renderable::render()
sdl_rendercopyex(thegame.getrenderer(), mtexture, mcliprect, mrenderrect, 0, null, sdl_flip_none);
}

#include "renderable.h"

#include #include using namespace std;
class textrenderable : public renderable
bool settext(string text, int fontsize, sdl_color color);
virtual void update(float time_step)
};bool textrenderable::settext(string text, int fontsize, sdl_color color) 
ttf_font *font = thegame.getfont(fontsize);
if (font != null)
sdl_freesu***ce(textsu***ce);
}} }
if (bsuccess)
return bsuccess;
}

#pragma once

#include #include #include #define fontmap mapusing namespace std;
class gamefont
~gamefont()
mfonts.clear();
} ttf_font *getfont(int fontsize)
else 
} return font;
} void deletefont(int fontsize)
}};

#pragma once

#include #include #include #include "renderable.h"
typedef std::vectorrenderlist;
typedef std::maprenderlayers;
class scene 
virtual void loadscene(){}
virtual ~scene(); 
void addrenderable(int layer, renderable *renderobj);
void addrenderable(renderable*renderobject);
renderlayers getlayers();
void update(float time_step);
void render();
virtual void handleevent(sdl_event &_event)
};void scene::update(float time_step)
layeriter++; }}
void scene::render()
else 
} layeriter++;
}}

#pragma once

#include "scene.h"
#include using namespace std;
#define thescenemanager scenemanager::instance()
typedef mapscenelist;
class scenemanager
void operator=(const scenemanager &){}
scenemanager()
scenelist mscenelist;
public:
static scenemanager &instance()
~scenemanager()
mscenelist.clear();
} bool addscene(int index, scene *scene)
mscenelist.insert(make_pair(index, scene));
return true;
} bool changescene(int index)
return false;
} void deletescene(int index)
} void update(float time_step)
void render()
void handleevent(sdl_event &_event)
}};

void sdlgame::run()

thescenemanager.handleevent(mevent);
} thescenemanager.update(mtimestep);
sdl_setrenderdrawcolor(mrenderer, 0x00, 0x00, 0x00, 0xff);
sdl_renderclear(mrenderer);
////繪圖
//thescenemanager.render();
sdl_renderpresent(mrenderer);
int remaining_time = mframetime - (sdl_getticks() - start);
if (remaining_time > 0) 
mtimestep = (sdl_getticks() - start) / 1000.f;
} if (mrenderer != null)
sdl_destroyrenderer(mrenderer);
if (mwindow != null)
sdl_destroywindow(mwindow); 
img_quit();
ttf_quit();
sdl_quit();
}

void loadingscene::loadscene();

if (loading->settext(chartoutf8("載入中……"), 30, color))
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