SDL1.2学习
http://wenku.baidu.com/view/c953c0878762caaedd33d4d8.html
一、安装：
sudo apt-get install libsdl1.2-dev libsdl-image1.2-dev libsdl-ttf2.0-dev libsdl-mixer1.2-dev libsdl-net1.2-dev libsdl-sound1.2-dev
二、编译测试用例：
sdl： 添加`sdl-config --cflags --libs` // 或-lSDL
opengl ： -lGL -LGLU
三、函数详解：
1.初始化，反初始化
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER) //
SDL_INIT_EVERYTHING
初始化音视频以及timer库
SDL_Quit();
结束
2.初始化display
SDL_Surface* screen = NULL;
//Initialize the display in a 640x480 8-bit palettized mode,requesting a software surface
screen = SDL_SetVideoMode(640, 480, 8, SDL_SWSURFACE);
3.timer&callback
SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void* param);
typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void* param);
SDL_WaitEvent(&event);
SDL_PollEvent()
例子：
1 {
2 ...
3
4 delay = 10;
5 my_timer_id = SDL_AddTimer(delay, my_callbackfunc, my_callback_param);
6
7 ...
8 }
9
10 Uint32 my_callbackfunc(Uint32 interval, void *param)
11 {
12 SDL_Event event;
13 SDL_UserEvent userevent;
14
15 userevent.type = SDL_USEREVENT;
16 userevent.code = 0;
17 userevent.data1 = &my_func;
18 userevent.data2 = NULL;
19
20 event.type = SDL_USEREVENT;
21 event.user = userevent;
22
23 SDL_PushEvent(&event);
24 return(interval);
25 }
26
27
28 {
29 ...
30 SDL_Event event;
31 while (SDL_PollEvent (&event)) {
32 switch(event.type) {
33 case SDL_USEREVENT: {
34 void (*p) (void*) = event.user.data1;
35 p(event.user.data2);
36 break;
37 }
38 }
39 }
40 ...
41 }
1 void CheckMouseHover(void)
2 {
3 int mouse_x, mouse_y;
4
5 SDL_PumpEvents();
6
7 SDL_GetMouseState(&mouse_x, &mouse_y);
8 if ( (mouse_x < 32) && (mouse_y < 32) ) {
9 printf("鼠标在左上角！\n");
10 }
11 }
检测鼠标事件例子：
1 #include <stdio.h>
2 #include <SDL/SDL.h>
3 #include <SDL/SDL_ttf.h>
4
5 #define bool int
6 #define false 0
7 #define true 1
8
9 SDL_Surface * screen = NULL;
10 const int SCREEN_BPP = 32 ;
11
12 int main( int argc, char * args[] )
13 {
14 // Start SDL
15
16 bool quit = false ;
17 SDL_Rect rectLeft;
18 SDL_Rect rectRight;
19 rectLeft.x = 0 ;
20 rectLeft.y = 0 ;
21 rectLeft.w = 320 ;
22 rectLeft.h = 480 ;
23 rectRight.x = 320 ;
24 rectRight.y = 0 ;
25 rectRight.w = 640 ;
26 rectRight.h = 480 ;
27
28 SDL_Init( SDL_INIT_EVERYTHING );
29
30 screen = SDL_SetVideoMode( 600 , 480 , SCREEN_BPP, SDL_SWSURFACE );
31 if (screen == NULL)
32 return false ;
33
34 Uint32 colorBlue = SDL_MapRGB(screen -> format, 0 , 0 , 255 );
35 Uint32 colorGreen = SDL_MapRGB(screen -> format, 0 , 255 , 0 );
36 Uint32 colorRed = SDL_MapRGB(screen -> format, 255 , 0 , 0 );
37 Uint32 colorBlack = SDL_MapRGB(screen -> format, 0 , 0 , 0 );
38
39 SDL_Event event ;
40 while ( ! quit) {
41 if (SDL_PollEvent( & event )) {
42 switch (event.type) {
43 case SDL_MOUSEMOTION:
44 {
45 Uint16 x = event .motion.x;
46 Uint16 y = event .motion.y;
47
48 if (x > 0 && x < 320 && y > 0 && y < 480 ) {
49 SDL_FillRect(screen, & rectLeft,colorBlue);
50 SDL_FillRect(screen, & rectRight,colorBlack);
51 }
52
53 if (x > 320 && x < 640 && y > 0 && y < 480 ) {
54 SDL_FillRect(screen, & rectRight,colorGreen);
55 SDL_FillRect(screen, & rectLeft,colorBlack);
56 }
57 break;
58 }
59
60 case SDL_MOUSEBUTTONDOWN:
61 {
62 Uint16 x = event .motion.x;
63 Uint16 y = event .motion.y;
64 if ( event .button.button == SDL_BUTTON_LEFT) {
65 if (x > 0 && x < 320 && y > 0 && y < 480 )
66 SDL_FillRect(screen, & rectLeft,colorRed);
67
68 if (x > 320 && x < 640 && y > 0 && y < 480 )
69 SDL_FillRect(screen, & rectRight,colorRed);
70 }
71 break;
72 }
73 case SDL_QUIT:
74 quit = true ;
75 break;
76
77 default :
78 break;
79 }
80 }
81
82 if (SDL_Flip(screen) == - 1 )
83 return false ;
84 }
85
86 SDL_FreeSurface(screen);
87 SDL_Quit();
88
89 return 0 ;
90 }
4.SDL_LoadBMP解析图片
例子：
1 #include <stdio.h>
2 #include <SDL/SDL.h>
3
4 SDL_Surface *screen = NULL;
5 const int SCREEN_BPP = 32;
6
7 void display_bmp(char* file_name)
8 {
9 SDL_Surface* image = NULL;
10
11 /* Load the BMP file into a surface */
12 image = SDL_LoadBMP(file_name);
13 if (image == NULL) {
14 fprintf(stderr, "Couldn't load %s: %s\n", file_name, SDL_GetError());
15 return;
16 }
17
18 /*
19 * Palettized screen modes will have a default palette (a standard
20 * 8*8*4 colour cube), but if the image is palettized as well we can
21 * use that palette for a nicer colour matching
22 */
23 if (image->format->palette && screen->format->palette) {
24 SDL_SetColors(screen, image->format->palette->colors, 0, image->format->palette->ncolors);
25 }
26
27 /* Blit onto the screen surface */
28 if (SDL_BlitSurface(image, NULL, screen, NULL) < 0)
29 fprintf(stderr, "BlitSurface error: %s\n", SDL_GetError());
30
31 /* Update the modified region of the screen */
32 SDL_UpdateRect(screen, 0, 0, image->w, image->h);
33
34 /* Free the allocated BMP surface */
35 SDL_FreeSurface(image);
36 }
37
38 int main(int argc, char **argv)
39 {
40 SDL_Init(SDL_INIT_EVERYTHING);
41
42 screen = SDL_SetVideoMode( 600 , 480 , SCREEN_BPP, SDL_SWSURFACE );
43 if (screen == NULL)
44 return -1;
45
46 display_bmp("test.bmp");
47
48 getchar();
49 return 0;
50 }
5.OPENGL&SDL
1 /*
2 * SDL OpenGL Tutorial.
3 * (c) Michael Vance, 2000
4 * briareos@lokigames.com
5 *
6 * Distributed under terms of the LGPL.
7 */
8
9 #include <SDL/SDL.h>
10 #include <GL/gl.h>
11 #include <GL/glu.h>
12
13 #include <stdio.h>
14 #include <stdlib.h>
15
16 static GLboolean should_rotate = GL_TRUE;
17
18 static void quit_tutorial( int code )
19 {
20 /*
21 * Quit SDL so we can release the fullscreen
22 * mode and restore the previous video settings, etc.
23 */
24 SDL_Quit( );
25
26 /* Exit program. */
27 exit( code );
28 }
29
30 static void handle_key_down( SDL_keysym* keysym )
31 {
32 /*
33 * We're only interested if 'Esc' has been presssed.
34 *
35 * EXERCISE:
36 * Handle the arrow keys and have that change the
37 * viewing position/angle.
38 */
39 switch( keysym->sym ) {
40 case SDLK_ESCAPE:
41 quit_tutorial( 0 );
42 break;
43 case SDLK_SPACE:
44 should_rotate = !should_rotate;
45 break;
46 default:
47 break;
48 }
49 }
50
51 static void process_events( void )
52 {
53 /* Our SDL event placeholder. */
54 SDL_Event event;
55
56 /* Grab all the events off the queue. */
57 while( SDL_PollEvent( &event ) ) {
58 switch( event.type ) {
59 case SDL_KEYDOWN:
60 /* Handle key presses. */
61 handle_key_down( &event.key.keysym );
62 break;
63
64 case SDL_QUIT:
65 /* Handle quit requests (like Ctrl-c). */
66 quit_tutorial( 0 );
67 break;
68
69 default:
70 break;
71 }
72 } /* while */
73 }
74
75 static void draw_screen( void )
76 {
77 /* Our angle of rotation. */
78 static float angle = 0.0f;
79 /*
80 * EXERCISE:
81 * Replace this awful mess with vertex
82 * arrays and a call to glDrawElements.
83 *
84 * EXERCISE:
85 * After completing the above, change
86 * it to use compiled vertex arrays.
87 *
88 * EXERCISE:
89 * Verify my windings are correct here ;).
90 */
91
92 static GLfloat v0[] = { -1.0f, -1.0f, 1.0f };
93 static GLfloat v1[] = { 1.0f, -1.0f, 1.0f };
94 static GLfloat v2[] = { 1.0f, 1.0f, 1.0f };
95 static GLfloat v3[] = { -1.0f, 1.0f, 1.0f };
96 static GLfloat v4[] = { -1.0f, -1.0f, -1.0f };
97 static GLfloat v5[] = { 1.0f, -1.0f, -1.0f };
98 static GLfloat v6[] = { 1.0f, 1.0f, -1.0f };
99 static GLfloat v7[] = { -1.0f, 1.0f, -1.0f };
100 static GLubyte red[] = { 255, 0, 0, 255 };
101 static GLubyte green[] = { 0, 255, 0, 255 };
102 static GLubyte blue[] = { 0, 0, 255, 255 };
103 static GLubyte white[] = { 255, 255, 255, 255 };
104 static GLubyte yellow[] = { 0, 255, 255, 255 };
105 static GLubyte black[] = { 0, 0, 0, 255 };
106 static GLubyte orange[] = { 255, 255, 0, 255 };
107 static GLubyte purple[] = { 255, 0, 255, 0 };
108
109 /* Clear the color and depth buffers. */
110 glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
111
112 /* We don't want to modify the projection matrix. */
113 glMatrixMode( GL_MODELVIEW );
114 glLoadIdentity( );
115
116 /* Move down the z-axis. */
117 glTranslatef( 0.0, 0.0, -5.0 );
118
119 /* Rotate. */
120 glRotatef( angle, 0.0, 1.0, 0.0 );
121
122 if ( should_rotate ) {
123 if ( ++angle > 360.0f ) {
124 angle = 0.0f;
125 }
126 }
127
128 /* Send our triangle data to the pipeline. */
129 glBegin( GL_TRIANGLES );
130
131 glColor4ubv( red );
132 glVertex3fv( v0 );
133 glColor4ubv( green );
134 glVertex3fv( v1 );
135 glColor4ubv( blue );
136 glVertex3fv( v2 );
137
138 glColor4ubv( red );
139 glVertex3fv( v0 );
140 glColor4ubv( blue );
141 glVertex3fv( v2 );
142 glColor4ubv( white );
143 glVertex3fv( v3 );
144 glColor4ubv( green );
145 glVertex3fv( v1 );
146 glColor4ubv( black );
147 glVertex3fv( v5 );
148 glColor4ubv( orange );
149 glVertex3fv( v6 );
150
151 glColor4ubv( green );
152 glVertex3fv( v1 );
153 glColor4ubv( orange );
154 glVertex3fv( v6 );
155 glColor4ubv( blue );
156 glVertex3fv( v2 );
157 glColor4ubv( black );
158 glVertex3fv( v5 );
159 glColor4ubv( yellow );
160 glVertex3fv( v4 );
161 glColor4ubv( purple );
162 glVertex3fv( v7 );
163
164 glColor4ubv( black );
165 glVertex3fv( v5 );
166 glColor4ubv( purple );
167 glVertex3fv( v7 );
168 glColor4ubv( orange );
169 glVertex3fv( v6 );
170 glColor4ubv( yellow );
171 glVertex3fv( v4 );
172 glColor4ubv( red );
173 glVertex3fv( v0 );
174 glColor4ubv( white );
175 glVertex3fv( v3 );
176
177 glColor4ubv( yellow );
178 glVertex3fv( v4 );
179 glColor4ubv( white );
180 glVertex3fv( v3 );
181 glColor4ubv( purple );
182 glVertex3fv( v7 );
183 glColor4ubv( white );
184 glVertex3fv( v3 );
185 glColor4ubv( blue );
186 glVertex3fv( v2 );
187 glColor4ubv( orange );
188 glVertex3fv( v6 );
189
190 glColor4ubv( white );
191 glVertex3fv( v3 );
192 glColor4ubv( orange );
193 glVertex3fv( v6 );
194 glColor4ubv( purple );
195 glVertex3fv( v7 );
196 glColor4ubv( green );
197 glVertex3fv( v1 );
198 glColor4ubv( red );
199 glVertex3fv( v0 );
200 glColor4ubv( yellow );
201 glVertex3fv( v4 );
202 glColor4ubv( green );
203 glVertex3fv( v1 );
204 glColor4ubv( yellow );
205 glVertex3fv( v4 );
206 glColor4ubv( black );
207 glVertex3fv( v5 );
208 glEnd( );
209
210 /*
211 * EXERCISE:
212 * Draw text telling the user that 'Spc' pauses the rotation and 'Esc' quits.
213 * Do it using vetors and textured quads.
214 */
215
216 /*
217 * Swap the buffers. This this tells the driver to
218 * render the next frame from the contents of the
219 * back-buffer, and to set all rendering operations
220 * to occur on what was the front-buffer.
221 *
222 * Double buffering prevents nasty visual tearing
223 * from the application drawing on areas of the
224 * screen that are being updated at the same time.
225 */
226 SDL_GL_SwapBuffers( );
227 }
228
229 static void setup_opengl( int width, int height )
230 {
231 float ratio = (float) width / (float) height;
232
233 /* Our shading model--Gouraud (smooth). */
234 glShadeModel( GL_SMOOTH );
235
236 /* Culling. */
237 glCullFace( GL_BACK );
238 glFrontFace( GL_CCW );
239 glEnable( GL_CULL_FACE );
240
241 /* Set the clear color. */
242 glClearColor( 0, 0, 0, 0 );
243
244 /* Setup our viewport. */
245 glViewport( 0, 0, width, height );
246
247 /*
248 * Change to the projection matrix and set
249 * our viewing volume.
250 */
251 glMatrixMode( GL_PROJECTION );
252 glLoadIdentity( );
253
254 /*
255 * EXERCISE:
256 * Replace this with a call to glFrustum.
257 */
258 gluPerspective( 60.0, ratio, 1.0, 1024.0 );
259 }
260
261 int main( int argc, char* argv[] )
262 {
263 /* Information about the current video settings. */
264 const SDL_VideoInfo* info = NULL;
265
266 /* Dimensions of our window. */
267 int width = 0;
268 int height = 0;
269
270 /* Color depth in bits of our window. */
271 int bpp = 0;
272
273 /* Flags we will pass into SDL_SetVideoMode. */
274 int flags = 0;
275
276 /* First, initialize SDL's video subsystem. */
277 if ( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
278 /* Failed, exit. */
279 fprintf( stderr, "Video initialization failed: %s\n", SDL_GetError( ) );
280 quit_tutorial( 1 );
281 }
282
283 /* Let's get some video information. */
284 info = SDL_GetVideoInfo( );
285
286 if ( !info ) {
287 /* This should probably never happen. */
288 fprintf( stderr, "Video query failed: %s\n", SDL_GetError( ) );
289 quit_tutorial( 1 );
290 }
291
292 /*
293 * Set our width/height to 640/480 (you would of course let the user
294 * decide this in a normal app). We get the bpp we will request from
295 * the display. On X11, VidMode can't change resolution, so this is
296 * probably being overly safe. Under Win32, ChangeDisplaySettings
297 * can change the bpp.
298 */
299
300 width = 640;
301 height = 480;
302 bpp = info->vfmt->BitsPerPixel;
303
304 /*
305 * Now, we want to setup our requested
306 * window attributes for our OpenGL window.
307 * We want *at least* 5 bits of red, green
308 * and blue. We also want at least a 16-bit
309 * depth buffer.
310 *
311 * The last thing we do is request a double
312 * buffered window. '1' turns on double
313 * buffering, '0' turns it off.
314 *
315 * Note that we do not use SDL_DOUBLEBUF in
316 * the flags to SDL_SetVideoMode. That does
317 * not affect the GL attribute state, only
318 * the standard 2D blitting setup.
319 */
320
321 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
322 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
323 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
324 SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
325 SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
326
327 /*
328 * We want to request that SDL provide us
329 * with an OpenGL window, in a fullscreen
330 * video mode.
331 *
332 * EXERCISE:
333 * Make starting windowed an option, and
334 * handle the resize events properly with
335 * glViewport.
336 */
337 flags = SDL_OPENGL | SDL_FULLSCREEN;
338
339 /*
340 * Set the video mode
341 */
342 if ( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) {
343 /*
344 * This could happen for a variety of reasons,
345 * including DISPLAY not being set, the specified
346 * resolution not being available, etc.
347 */
348 fprintf( stderr, "Video mode set failed: %s\n", SDL_GetError( ) );
349 quit_tutorial( 1 );
350 }
351
352 /*
353 * At this point, we should have a properly setup
354 * double-buffered window for use with OpenGL.
355 */
356 setup_opengl( width, height );
357
358 /*
359 * Now we want to begin our normal app process--
360 * an event loop with a lot of redrawing.
361 */
362 setup_opengl( width, height );
363
364 /*
365 * Now we want to begin our normal app process--
366 * an event loop with a lot of redrawing.
367 */
368 while (1) {
369 /* Process incoming events. */
370 process_events( );
371
372 /* Draw the screen. */
373 draw_screen( );
374
375 /* Avoid to eat all the CPU power */
376 SDL_Delay( 50 );
377 }
378
379 /*
380 * EXERCISE:
381 * Record timings using SDL_GetTicks() and
382 * and print out frames per second at program
383 * end.
384 */
385
386 /* Never reached. */
387 return 0;
388 }
