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Cara memuat music menggunakan SDL
Pelajaran ini menunjukkan kepada Anda bagaimana menggunakan SDL memuat file gambar GIF. Biasanya, bukannya menampilkan
seluruh gambar, kita hanya perlu "gambar" dalam file gambar, seperti gadis keadilan dalam kasus ini.
Jadi, kita bisa mengatakan program ini, kami hanya ingin menampilkan bagian dari file gambar ini. Untuk melakukan hal ini,
pada awalnya, kita mempersiapkan file gambar dengan gambar di dalamnya. Kemudian kita cat bagian kita tidak perlu
warna putih (RGB = 255255255 atau 0xFFFFFF). Kedua, hanya memberitahu program yang warna
harus diabaikan, yang putih di sini.
Download SDL_mixer di official website .
File musik dalam contoh ini untuk demonstrasi adalah dari Square: Final Fantasy II:
http://en.wikipedia.org/wiki/Final_Fantasy_II
Setup SDL_image into Dev-C++ :
1. Dalam compiler options, tambahkan ini ke linker "-lSDL_mixer"
2. tambah baru C / C ++ termasuk direktori file ke SDL_mixer.h
3. tambah baru perpustakaan direktori untuk SDL_mixer.dll
4. tambah baru "# include" SDL_mixer.h "" dalam kode program Anda
Untuk mendirikan sebuah perpustakaan baru, prosedur semua sangat mirip :)
Program code :
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
int FPS = 50; // Assign a FPS
int NextTick , interval ;
// Initialize FPS_Fn( )
void FPS_Initial(void) {
NextTick = 0 ;
interval = 1 * 1000 / FPS ;
return;
}
// Frame Per Second Function , put this in a loop
void FPS_Fn(void) {
if ( NextTick > SDL_GetTicks( ) ) SDL_Delay( NextTick - SDL_GetTicks( ) );
NextTick = SDL_GetTicks( ) + interval ;
return;
}
// This function load a image file to a surface
// Set bCKey with colorkey (R,G,B) to clear a color on the image
// Set alpha value for transparency 0(No transparent) ~ 255(Ivisible)
inline SDL_Surface *ImgLoader(char *file,bool bCKey, int r , int g , int b , int alpha)
{
SDL_Surface *pic;
pic = IMG_Load(file); // From SDL_image.h , load the image to pic
// Log error message into stderr.txt if happened
if(pic==NULL) fprintf(stderr,"Missing image %s : %s\n",file,IMG_GetError());
if( bCKey ) {
// Sets the color key (transparent pixel) in a blittable surface and RLE acceleration.
SDL_SetColorKey(pic,SDL_SRCCOLORKEY|SDL_RLEACCEL,SDL_MapRGB(pic->format,r,g,b));
}
if(alpha) SDL_SetAlpha(pic, SDL_SRCALPHA|SDL_RLEACCEL , 255 - alpha);
pic = SDL_DisplayFormat(pic);
return (pic);
}
// Load a normal picture into a surface
inline SDL_Surface *ImgLoader(char *file)
{ return ImgLoader(file,1,0,0,0,0) ; }
// Load a pic & set the transparent color to (255,255,255) , no alpha
inline SDL_Surface *ImgLoader(char *file,bool bCKey)
{ return ImgLoader(file,1,255,255,255,0) ; }
int main(int argc, char *argv[])
{
SDL_Event event;
bool bRun = 1;
int pidx = 0 , aTick = 0;
SDL_Surface *screen ;
enum walk { justice1 , justice2 , justice3 , justice4
, justice5 , justice6 , justice_No };
SDL_Surface *anim[justice_No];
SDL_Rect animRect ;
animRect.x = 160 ;
animRect.y = 160 ;
atexit(SDL_Quit);
if( SDL_Init(SDL_INIT_VIDEO) < 0 ) exit(1);
SDL_WM_SetCaption("SDL Window", NULL);
screen = SDL_SetVideoMode( 400 , 300 , 32 , SDL_DOUBLEBUF|SDL_HWSURFACE|SDL_ANYFORMAT);
anim[0] = ImgLoader("./anim/justice1.gif",1,255,255,255,0);
anim[1] = ImgLoader("./anim/justice2.gif",1,255,255,255,0);
anim[2] = ImgLoader("./anim/justice3.gif",1,255,255,255,0);
anim[3] = ImgLoader("./anim/justice4.gif",1);
anim[4] = ImgLoader("./anim/justice5.gif",1);
anim[5] = ImgLoader("./anim/justice6.gif",1);
FPS_Initial( );
// Inilialize SDL_mixer , exit if fail
if( SDL_Init(SDL_INIT_AUDIO) < 0 ) exit(1);
// Setup audio mode
Mix_OpenAudio(22050,AUDIO_S16SYS,2,640);
Mix_Music *mus , *mus2 ; // Background Music
Mix_Chunk *wav , *wav2 ; // For Sounds
mus = Mix_LoadMUS("./mixer/ff2prlde.mid");
mus2 = Mix_LoadMUS("./mixer/aria.mp3");
wav = Mix_LoadWAV("./mixer/po_p2k.wav");
wav2 = Mix_LoadWAV("./mixer/start.wav");
Mix_PlayMusic(mus,1); //Music loop=1
while(bRun) {
aTick++;
SDL_FillRect(screen , NULL , 0x221122);
SDL_BlitSurface( anim[pidx] , NULL , screen , &animRect );
SDL_Flip(screen);
FPS_Fn();
if( aTick%10 == 0 ) pidx++;
if(pidx >= justice_No) pidx = 0;
while( SDL_PollEvent( &event ) ){
switch( event.type ){
case SDL_KEYDOWN:
//use -1 for the first free unreserved channel , 0-> no loop
Mix_PlayChannel(-1,wav,0);
switch( event.key.keysym.sym ){
case SDLK_UP:
animRect.y = animRect.y - 10;
break;
case SDLK_DOWN:
animRect.y = animRect.y + 10;
break;
case SDLK_LEFT:
animRect.x = animRect.x - 10;
break;
case SDLK_RIGHT:
animRect.x = animRect.x + 10;
break;
case SDLK_1:
Mix_PlayMusic(mus,1); //Music loop=1
break;
case SDLK_2:
Mix_PlayMusic(mus2,2); //Music loop=twice
break; case SDLK_ESCAPE:
bRun = 0 ;
break;
default:
//use -1 for the first free unreserved channel , 0-> no loop
Mix_PlayChannel(-1,wav2,0);
break;
} // switch( event.key.keysym.sym ){ END
break; // case SDL_KEYDOWN: END
case SDL_QUIT:
bRun = 0;
break;
default:
break;
} // switch( event.type ){ END
} // while( SDLK_PollEvent( &event ) ){ END
}; // while(bRun) { END
Mix_FreeChunk(wav);
Mix_FreeChunk(wav2);
Mix_FreeMusic(mus);
Mix_FreeMusic(mus2);
return 0;
}
seluruh gambar, kita hanya perlu "gambar" dalam file gambar, seperti gadis keadilan dalam kasus ini.
Jadi, kita bisa mengatakan program ini, kami hanya ingin menampilkan bagian dari file gambar ini. Untuk melakukan hal ini,
pada awalnya, kita mempersiapkan file gambar dengan gambar di dalamnya. Kemudian kita cat bagian kita tidak perlu
warna putih (RGB = 255255255 atau 0xFFFFFF). Kedua, hanya memberitahu program yang warna
harus diabaikan, yang putih di sini.
Download SDL_mixer di official website .
File musik dalam contoh ini untuk demonstrasi adalah dari Square: Final Fantasy II:
http://en.wikipedia.org/wiki/Final_Fantasy_II
Setup SDL_image into Dev-C++ :
1. Dalam compiler options, tambahkan ini ke linker "-lSDL_mixer"
2. tambah baru C / C ++ termasuk direktori file ke SDL_mixer.h
3. tambah baru perpustakaan direktori untuk SDL_mixer.dll
4. tambah baru "# include" SDL_mixer.h "" dalam kode program Anda
Untuk mendirikan sebuah perpustakaan baru, prosedur semua sangat mirip :)
Program code :
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
int FPS = 50; // Assign a FPS
int NextTick , interval ;
// Initialize FPS_Fn( )
void FPS_Initial(void) {
NextTick = 0 ;
interval = 1 * 1000 / FPS ;
return;
}
// Frame Per Second Function , put this in a loop
void FPS_Fn(void) {
if ( NextTick > SDL_GetTicks( ) ) SDL_Delay( NextTick - SDL_GetTicks( ) );
NextTick = SDL_GetTicks( ) + interval ;
return;
}
// This function load a image file to a surface
// Set bCKey with colorkey (R,G,B) to clear a color on the image
// Set alpha value for transparency 0(No transparent) ~ 255(Ivisible)
inline SDL_Surface *ImgLoader(char *file,bool bCKey, int r , int g , int b , int alpha)
{
SDL_Surface *pic;
pic = IMG_Load(file); // From SDL_image.h , load the image to pic
// Log error message into stderr.txt if happened
if(pic==NULL) fprintf(stderr,"Missing image %s : %s\n",file,IMG_GetError());
if( bCKey ) {
// Sets the color key (transparent pixel) in a blittable surface and RLE acceleration.
SDL_SetColorKey(pic,SDL_SRCCOLORKEY|SDL_RLEACCEL,SDL_MapRGB(pic->format,r,g,b));
}
if(alpha) SDL_SetAlpha(pic, SDL_SRCALPHA|SDL_RLEACCEL , 255 - alpha);
pic = SDL_DisplayFormat(pic);
return (pic);
}
// Load a normal picture into a surface
inline SDL_Surface *ImgLoader(char *file)
{ return ImgLoader(file,1,0,0,0,0) ; }
// Load a pic & set the transparent color to (255,255,255) , no alpha
inline SDL_Surface *ImgLoader(char *file,bool bCKey)
{ return ImgLoader(file,1,255,255,255,0) ; }
int main(int argc, char *argv[])
{
SDL_Event event;
bool bRun = 1;
int pidx = 0 , aTick = 0;
SDL_Surface *screen ;
enum walk { justice1 , justice2 , justice3 , justice4
, justice5 , justice6 , justice_No };
SDL_Surface *anim[justice_No];
SDL_Rect animRect ;
animRect.x = 160 ;
animRect.y = 160 ;
atexit(SDL_Quit);
if( SDL_Init(SDL_INIT_VIDEO) < 0 ) exit(1);
SDL_WM_SetCaption("SDL Window", NULL);
screen = SDL_SetVideoMode( 400 , 300 , 32 , SDL_DOUBLEBUF|SDL_HWSURFACE|SDL_ANYFORMAT);
anim[0] = ImgLoader("./anim/justice1.gif",1,255,255,255,0);
anim[1] = ImgLoader("./anim/justice2.gif",1,255,255,255,0);
anim[2] = ImgLoader("./anim/justice3.gif",1,255,255,255,0);
anim[3] = ImgLoader("./anim/justice4.gif",1);
anim[4] = ImgLoader("./anim/justice5.gif",1);
anim[5] = ImgLoader("./anim/justice6.gif",1);
FPS_Initial( );
// Inilialize SDL_mixer , exit if fail
if( SDL_Init(SDL_INIT_AUDIO) < 0 ) exit(1);
// Setup audio mode
Mix_OpenAudio(22050,AUDIO_S16SYS,2,640);
Mix_Music *mus , *mus2 ; // Background Music
Mix_Chunk *wav , *wav2 ; // For Sounds
mus = Mix_LoadMUS("./mixer/ff2prlde.mid");
mus2 = Mix_LoadMUS("./mixer/aria.mp3");
wav = Mix_LoadWAV("./mixer/po_p2k.wav");
wav2 = Mix_LoadWAV("./mixer/start.wav");
Mix_PlayMusic(mus,1); //Music loop=1
while(bRun) {
aTick++;
SDL_FillRect(screen , NULL , 0x221122);
SDL_BlitSurface( anim[pidx] , NULL , screen , &animRect );
SDL_Flip(screen);
FPS_Fn();
if( aTick%10 == 0 ) pidx++;
if(pidx >= justice_No) pidx = 0;
while( SDL_PollEvent( &event ) ){
switch( event.type ){
case SDL_KEYDOWN:
//use -1 for the first free unreserved channel , 0-> no loop
Mix_PlayChannel(-1,wav,0);
switch( event.key.keysym.sym ){
case SDLK_UP:
animRect.y = animRect.y - 10;
break;
case SDLK_DOWN:
animRect.y = animRect.y + 10;
break;
case SDLK_LEFT:
animRect.x = animRect.x - 10;
break;
case SDLK_RIGHT:
animRect.x = animRect.x + 10;
break;
case SDLK_1:
Mix_PlayMusic(mus,1); //Music loop=1
break;
case SDLK_2:
Mix_PlayMusic(mus2,2); //Music loop=twice
break; case SDLK_ESCAPE:
bRun = 0 ;
break;
default:
//use -1 for the first free unreserved channel , 0-> no loop
Mix_PlayChannel(-1,wav2,0);
break;
} // switch( event.key.keysym.sym ){ END
break; // case SDL_KEYDOWN: END
case SDL_QUIT:
bRun = 0;
break;
default:
break;
} // switch( event.type ){ END
} // while( SDLK_PollEvent( &event ) ){ END
}; // while(bRun) { END
Mix_FreeChunk(wav);
Mix_FreeChunk(wav2);
Mix_FreeMusic(mus);
Mix_FreeMusic(mus2);
return 0;
}
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