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1 | /* |
2 | GP2X minimal library v0.A by rlyeh, 2005. emulnation.info@rlyeh (swap it!) |
3 | |
4 | + GP2X 920t/940t CPUs library with a FIFO message system. |
5 | + GP2X video library with double buffering. |
6 | + GP2X sound library with double buffering. |
7 | + GP2X blitter library. |
8 | + GP2X timer library. |
9 | + GP2X joystick library. |
10 | |
11 | Thanks to Squidge, Robster, snaff, Reesy and NK, for the help & previous work! :-) |
12 | |
13 | |
14 | License |
15 | ======= |
16 | |
17 | Free for non-commercial projects (it would be nice receiving a mail from you). |
18 | Other cases, ask me first. |
19 | |
20 | GamePark Holdings is not allowed to use this library and/or use parts from it. |
21 | |
22 | |
23 | Known projects using the library or parts from it |
24 | ================================================= |
25 | |
26 | REminiscence-0.1.8 (rlyeh) |
27 | Atari800 GP2X pre-release 3 (foft) |
28 | XUMP (kedo) |
29 | MAME2X (Franxis) |
30 | DrMD for GP2X (Reesy) |
31 | |
32 | |
33 | What's new |
34 | ========== |
35 | |
36 | 0.A: 940t disabled all time unless required |
37 | sound is paused by default now, use gp2x_sound_pause() to unlock it |
38 | |
39 | fixed functions: |
40 | - gp2x_sound_play() ; increased the number of sampling buffers |
41 | - gp2x_timer_read() ; it should work again. broken at some point before |
42 | - gp2x_dualcore_launch_program_from_disk() ; it missed the code uploading call |
43 | |
44 | added functions: |
45 | - gp2x_sound_pause() |
46 | - gp2x_timer_delay() |
47 | - gp2x_dualcore_pause() |
48 | |
49 | 0.9: initial FIFO message system for dual cpu cores. |
50 | initial 48 Mb support. |
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51 | initial quadruple buffering in 8bbp mode. |
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52 | |
53 | added functions: |
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54 | - gp2x_dualcore_exec() ; initial FIFO message system for dual cpu cores. |
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55 | - gp2x_dualcore_sync() ; initial FIFO message system for dual cpu cores. |
56 | |
57 | improved functions: |
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58 | - gp2x_video_flip() ; initial quadruple buffering in 8bbp mode. |
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59 | |
60 | 0.8: initial dual cores cpu support. |
61 | very basic blit functions by popular demand ;-) |
62 | vsync & hsync waiting code (thanks Reesy) |
63 | |
64 | added functions: |
65 | - gp2x_launch_program() ; initial dual cores cpu support. |
66 | - gp2x_launch_program_from_disk() ; initial dual cores cpu support. |
67 | - gp2x_launch_subprogram() ; initial dual cores cpu support. |
68 | - gp2x_blitter_rect15() ; very basic blit function by popular demand ;-) |
69 | - gp2x_blitter_rect8() ; very basic blit function by popular demand ;-) |
70 | - gp2x_video_hsync() ; hsync waiting code (thanks Reesy) |
71 | - gp2x_video_vsync() ; vsync waiting code (thanks Reesy) |
72 | |
73 | fixed functions: |
74 | - gp2x_video_color8() ; bugfixed a stupid typo (thanks Franxis for the bug report) |
75 | |
76 | 0.7: added functions: |
77 | - gp2x_sound_volume() |
78 | |
79 | fixed functions: |
80 | - gp2x_deinit() ; fixed menu launch code when exiting. |
81 | |
82 | improved functions: |
83 | - gp2x_timer_read() ; rewritten timer. it should be more accurate now. |
84 | - gp2x_init() ; faster init code. |
85 | |
86 | 0.6: added functions: |
87 | - gp2x_timer_read() |
88 | - gp2x_sound_pause() |
89 | |
90 | fixed functions: |
91 | - gp2x_video_setpalette() ; palette handling was incorrect. fixed. |
92 | |
93 | 0.5: improved functions: |
94 | - gp2x_init() ; better and cleaner initalizing code. |
95 | - gp2x_init() ; sound patched for real stereo output (by using NK's solution) |
96 | |
97 | 0.4: lots of cleanups. |
98 | sound is threaded and double buffered now. |
99 | 8 bpp video support. |
100 | |
101 | fixed functions: |
102 | - gp2x_deinit() ; better and cleaner exiting code. |
103 | |
104 | 0.3: shorter library. |
105 | |
106 | fixed functions: |
107 | - gp2x_joystick_read() ; improved joystick diagonal detection. |
108 | |
109 | 0.2: better code layout. |
110 | public release. |
111 | |
112 | 0.1: beta release. |
113 | */ |
114 | |
115 | #include "minimal.h" |
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116 | #include "squidgehack.h" |
117 | #include "asmutils.h" |
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118 | |
119 | unsigned char *gp2x_screen8 ,*gp2x_upperRAM; |
120 | unsigned long gp2x_dev[8]={0,0,0,0,0,0,0,0}, gp2x_physvram[8], *gp2x_memregl, gp2x_volume, gp2x_ticks_per_second; |
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121 | volatile unsigned long gp2x_sound_pausei=1, gp2x_ticks=0, gp2x_sound=0, *gp2x_dualcore_ram=0; |
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122 | unsigned short *gp2x_memregs, *gp2x_screen15, *gp2x_logvram15[4], gp2x_sound_buffer[4+((44100/25)*2)*8]; //25 Hz gives our biggest supported sampling buffer |
123 | volatile unsigned short gp2x_palette[512]; |
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124 | |
125 | extern void gp2x_sound_frame(void *blah, void *buff, int samples); |
126 | |
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127 | // hack |
128 | static int scaling_enabled = 0; |
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129 | |
130 | void gp2x_video_flip(void) |
131 | { |
132 | unsigned long address=gp2x_physvram[gp2x_physvram[7]]; |
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133 | if (scaling_enabled) address += 32; |
134 | |
135 | // since we are using the mmu hack, we must flush the cache first |
136 | // (the params are most likely wrong, but they seem to work somehow) |
137 | flushcache(address, address + 320*240, 0); |
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138 | |
139 | if(++gp2x_physvram[7]==4) gp2x_physvram[7]=0; |
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140 | gp2x_screen15=gp2x_logvram15[gp2x_physvram[7]]; |
141 | gp2x_screen8=(unsigned char *)gp2x_screen15; |
142 | |
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143 | gp2x_memregs[0x290E>>1]=(unsigned short)(address & 0xFFFF); |
144 | gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16); |
145 | gp2x_memregs[0x2912>>1]=(unsigned short)(address & 0xFFFF); |
146 | gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16); |
147 | } |
148 | |
149 | void gp2x_video_flip_single(void) |
150 | { |
151 | unsigned long address=gp2x_physvram[0]; |
152 | |
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153 | gp2x_screen15=gp2x_logvram15[0]; |
154 | gp2x_screen8=(unsigned char *)gp2x_screen15; |
155 | |
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156 | gp2x_memregs[0x290E>>1]=(unsigned short)(address & 0xFFFF); |
157 | gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16); |
158 | gp2x_memregs[0x2912>>1]=(unsigned short)(address & 0xFFFF); |
159 | gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16); |
160 | } |
161 | |
162 | |
163 | void gp2x_video_setgamma(unsigned short gamma) /*0..255*/ |
164 | { |
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165 | int i=256*3; |
166 | gp2x_memregs[0x295C>>1]=0; |
167 | while(i--) gp2x_memregs[0x295E>>1]=gamma; |
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168 | } |
169 | |
170 | void gp2x_video_setpalette(void) |
171 | { |
172 | unsigned short *g=(unsigned short *)gp2x_palette; int i=512; |
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173 | gp2x_memregs[0x2958>>1]=0; |
174 | while(i--) gp2x_memregs[0x295A>>1]=*g++; |
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175 | } |
176 | |
177 | void gp2x_blitter_rect15(gp2x_rect *r) |
178 | { |
179 | int x, y; unsigned short *data=r->data15, *offset=&gp2x_screen15[r->x+r->y*320]; |
180 | |
181 | y=r->h; if(r->solid) |
182 | while(y--) { x=r->w; while(x--) *offset++=*data++; offset+=320-x; } |
183 | else |
184 | while(y--) { x=r->w; while(x--) { if(*data) *offset=*data; offset++, data++; } |
185 | offset+=320-x; } |
186 | } |
187 | |
188 | void gp2x_blitter_rect8(gp2x_rect *r) |
189 | { |
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190 | int x, y; unsigned char *data=r->data8, *offset=&gp2x_screen8[r->x+r->y*320]; |
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191 | |
192 | y=r->h; if(r->solid) |
193 | while(y--) { x=r->w; while(x--) *offset++=*data++; offset+=320-x; } |
194 | else |
195 | while(y--) { x=r->w; while(x--) { if(*data) *offset=*data; offset++, data++; } |
196 | offset+=320-x; } |
197 | } |
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198 | |
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199 | unsigned long gp2x_joystick_read(void) |
200 | { |
201 | unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF); |
202 | |
203 | if(value==0xFD) value=0xFA; |
204 | if(value==0xF7) value=0xEB; |
205 | if(value==0xDF) value=0xAF; |
206 | if(value==0x7F) value=0xBE; |
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207 | |
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208 | return ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16)); |
209 | } |
210 | |
211 | void gp2x_sound_volume(int l, int r) |
212 | { |
213 | l=(((l*0x50)/100)<<8)|((r*0x50)/100); //0x5A, 0x60 |
214 | ioctl(gp2x_dev[4], SOUND_MIXER_WRITE_PCM, &l); //SOUND_MIXER_WRITE_VOLUME |
215 | } |
216 | |
217 | void gp2x_timer_delay(unsigned long ticks) |
218 | { |
219 | unsigned long target=gp2x_memregl[0x0A00>>2]+ticks*gp2x_ticks_per_second; |
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220 | while(gp2x_memregl[0x0A00>>2]<target); |
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221 | } |
222 | |
223 | unsigned long gp2x_timer_read(void) |
224 | { |
225 | return gp2x_memregl[0x0A00>>2]/gp2x_ticks_per_second; |
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226 | } |
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227 | |
228 | unsigned long gp2x_timer_read_ms(void) |
229 | { |
230 | return gp2x_memregl[0x0A00>>2]; |
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231 | } |
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232 | |
233 | |
234 | void gp2x_sound_pause(int yes) { gp2x_sound_pausei=yes; } |
235 | |
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236 | #if 0 |
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237 | static void *gp2x_sound_play(void *blah) |
238 | { |
239 | int flip=0, flyp=gp2x_sound_buffer[1]; |
240 | struct timespec ts; ts.tv_sec=0, ts.tv_nsec=gp2x_sound_buffer[2]; |
241 | |
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242 | while(!gp2x_sound) |
243 | { |
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244 | nanosleep(&ts, NULL); |
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245 | |
246 | |
247 | if(!gp2x_sound_pausei) |
248 | { |
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249 | // [1] is sound buffer size at 22050, 16, stereo, it is 1468 (367*4) |
250 | // [0] number of bytes?, at 22050,16,stereo, it is 367 |
251 | // first half of buffer |
252 | |
253 | // first one is 368 |
254 | |
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255 | |
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256 | gp2x_sound_frame(blah, (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[0]); |
257 | // write out to second half of buffer |
258 | write(gp2x_dev[3], (void *)(&gp2x_sound_buffer[4+flyp]), gp2x_sound_buffer[1]); |
259 | |
260 | flip+=gp2x_sound_buffer[1]; |
261 | if(flip==gp2x_sound_buffer[1]*8) flip=0; |
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262 | flyp+=gp2x_sound_buffer[1]; |
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263 | if(flyp==gp2x_sound_buffer[1]*8) flyp=0; |
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264 | } |
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265 | } |
266 | return NULL; |
267 | } |
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268 | #endif |
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269 | |
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270 | #if 0 |
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271 | static void gp2x_initqueue(gp2x_queue *q, unsigned long queue_items, unsigned long *position920t, unsigned long *position940t) |
272 | { |
273 | q->head = q->tail = q->items = 0; |
274 | q->max_items = queue_items; |
275 | if(position920t) q->place920t=position920t; else q->place920t=(unsigned long *)malloc(sizeof(unsigned long) * queue_items); |
276 | if(position940t) q->place940t=position940t; |
277 | memset(q->place920t, 0, sizeof(unsigned long) * queue_items); |
278 | } |
279 | |
280 | static void gp2x_enqueue(gp2x_queue *q, unsigned long data) |
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281 | { |
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282 | while(q->items==q->max_items); /*waiting for tail to decrease...*/ |
283 | q->place920t[q->head = (q->head < q->max_items ? q->head+1 : 0)] = data; |
284 | q->items++; |
285 | } |
286 | |
287 | /* UNUSED |
288 | static unsigned long gp2x_dequeue(gp2x_queue *q) |
289 | { |
290 | while(!q->items); //waiting for head to increase... |
291 | q->items--; |
292 | return q->place920t[q->tail = (q->tail < q->max_items ? q->tail+1 : 0)]; |
293 | } */ |
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294 | #endif |
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295 | |
296 | void gp2x_dualcore_pause(int yes) { if(yes) gp2x_memregs[0x0904>>1] &= 0xFFFE; else gp2x_memregs[0x0904>>1] |= 1; } |
297 | static void gp2x_940t_reset(int yes) { gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (0x03); } |
298 | static void gp2x_940t_pause(int yes) { gp2x_dualcore_pause(yes); } |
299 | |
300 | static void gp2x_dualcore_registers(int save) |
301 | { |
302 | static unsigned short regs[8]; |
303 | |
304 | if(save) |
305 | { |
306 | regs[0]=gp2x_memregs[0x0904>>1]; regs[1]=gp2x_memregs[0x0912>>1]; |
307 | regs[2]=gp2x_memregs[0x091c>>1]; regs[3]=gp2x_memregs[0x3b40>>1]; |
308 | regs[4]=gp2x_memregs[0x3b42>>1]; regs[5]=gp2x_memregs[0x3b48>>1]; |
309 | regs[6]=gp2x_memregs[0x3b44>>1]; regs[7]=gp2x_memregs[0x3b46>>1]; |
310 | |
311 | gp2x_940t_reset(1); |
312 | gp2x_940t_pause(1); |
313 | } |
314 | else |
315 | { |
316 | gp2x_memregs[0x0904>>1]=regs[0]; gp2x_memregs[0x0912>>1]=regs[1]; |
317 | gp2x_memregs[0x091c>>1]=regs[2]; gp2x_memregs[0x3b40>>1]=regs[3]; |
318 | gp2x_memregs[0x3b42>>1]=regs[4]; gp2x_memregs[0x3b48>>1]=regs[5]; |
319 | gp2x_memregs[0x3b44>>1]=regs[6]; gp2x_memregs[0x3b46>>1]=regs[7]; |
320 | } |
321 | } |
322 | |
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323 | #if 0 |
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324 | void gp2x_dualcore_sync(void) |
325 | { |
326 | gp2x_queue *q=(gp2x_queue *)gp2x_1stcore_data_ptr(GP2X_QUEUE_ARRAY_PTR); |
327 | while(q->items); |
328 | } |
329 | |
330 | void gp2x_dualcore_exec(unsigned long command) { gp2x_enqueue((gp2x_queue *)gp2x_1stcore_data_ptr(GP2X_QUEUE_ARRAY_PTR),command); } |
331 | |
332 | void gp2x_dualcore_launch_program(unsigned long *area, unsigned long size) |
333 | { |
334 | unsigned long i=0, *arm940t_ram=(unsigned long *)gp2x_dualcore_ram; |
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335 | |
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336 | gp2x_940t_reset(1); |
337 | |
338 | gp2x_memregs[0x3B40>>1] = 0; //disable interrupts |
339 | gp2x_memregs[0x3B42>>1] = 0; |
340 | gp2x_memregs[0x3B44>>1] = 0xffff; |
341 | gp2x_memregs[0x3B46>>1] = 0xffff; |
342 | |
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343 | gp2x_940t_pause(0); |
344 | |
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345 | while(i < size) *arm940t_ram++=area[i++]; |
346 | |
347 | gp2x_initqueue((gp2x_queue *)gp2x_1stcore_data_ptr(GP2X_QUEUE_ARRAY_PTR), GP2X_QUEUE_MAX_ITEMS, (unsigned long *)gp2x_1stcore_data_ptr(GP2X_QUEUE_DATA_PTR), (unsigned long *)gp2x_2ndcore_data_ptr(GP2X_QUEUE_DATA_PTR)); |
348 | |
349 | gp2x_940t_reset(0); |
350 | } |
351 | |
352 | void gp2x_dualcore_launch_program_from_disk(const char *file, unsigned long offset, unsigned long size) |
353 | { |
354 | FILE *in; void *data; |
355 | |
356 | if((in=fopen(file, "rb"))==NULL) return; |
357 | if((data=malloc(size))==NULL) { fclose(in); return; } |
358 | fseek(in, 0L, offset); |
359 | fread(data, 1, size, in); |
360 | gp2x_dualcore_launch_program((unsigned long *)data, size); |
361 | free(data); |
362 | fclose(in); |
363 | } |
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364 | #endif |
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365 | |
366 | void gp2x_init(int ticks_per_second, int bpp, int rate, int bits, int stereo, int Hz) |
367 | { |
368 | struct fb_fix_screeninfo fixed_info; |
369 | static int first=1; |
370 | |
371 | // GP2X_DO_SOUND |
372 | int gp2x_do_sound=1; |
373 | int frag=0; |
374 | int channels=1; |
375 | int stereoLocal=0; |
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376 | int ret; |
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377 | |
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378 | gp2x_ticks_per_second=7372800/ticks_per_second; |
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379 | |
380 | if(!gp2x_dev[0]) gp2x_dev[0] = open("/dev/fb0", O_RDWR); |
381 | if(!gp2x_dev[1]) gp2x_dev[1] = open("/dev/fb1", O_RDWR); |
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382 | if(!gp2x_dev[2]) gp2x_dev[2] = open("/dev/mem", O_RDWR); |
383 | |
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384 | ioctl(gp2x_dev[gp2x_physvram[7]=0], FBIOGET_FSCREENINFO, &fixed_info); |
385 | gp2x_physvram[2]=gp2x_physvram[0]=fixed_info.smem_start; |
386 | gp2x_screen15=gp2x_logvram15[2]=gp2x_logvram15[0]= |
387 | (unsigned short *)mmap(0, 0x20000*2, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], gp2x_physvram[0]); |
388 | gp2x_screen8=(unsigned char *)gp2x_screen15; |
389 | printf("/dev/fb0 is @ %08lx / %p\n", gp2x_physvram[0], gp2x_screen15); |
390 | |
391 | ioctl(gp2x_dev[1], FBIOGET_FSCREENINFO, &fixed_info); |
392 | gp2x_physvram[3]=gp2x_physvram[1]=fixed_info.smem_start; |
393 | gp2x_logvram15[3]=gp2x_logvram15[1]= |
394 | (unsigned short *)mmap(0, 0x20000*2, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], gp2x_physvram[1]); |
395 | printf("/dev/fb1 is @ %08lx / %p\n", gp2x_physvram[1], gp2x_logvram15[1]); |
396 | |
397 | // apply the MMU hack |
398 | ret = mmuhack(); |
399 | printf("squidge hack code finished and returned %s\n", ret ? "ok" : "fail"); |
400 | |
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401 | // don't run sound right now |
402 | if ( gp2x_do_sound) |
403 | { |
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404 | if(!gp2x_dev[3]) gp2x_dev[3] = open("/dev/dsp", O_WRONLY|O_ASYNC); |
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405 | if(!gp2x_dev[4]) gp2x_dev[4] = open("/dev/mixer", O_RDWR); |
406 | } |
407 | |
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408 | // gp2x_dualcore_ram=(unsigned long *)mmap(0, 0x1000000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0x03000000); |
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409 | /*gp2x_dualcore_ram=(unsigned long *)mmap(0, 0x2000000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0x02000000);*/ |
410 | gp2x_memregl=(unsigned long *)mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0xc0000000); |
411 | gp2x_memregs=(unsigned short *)gp2x_memregl; |
412 | |
413 | if(first) { printf(MINILIB_VERSION "\n"); |
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414 | gp2x_dualcore_registers(1); |
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415 | gp2x_sound_volume(100,100); |
416 | gp2x_memregs[0x0F16>>1] = 0x830a; usleep(100000); |
417 | gp2x_memregs[0x0F58>>1] = 0x100c; usleep(100000); } |
418 | |
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419 | gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/ |
420 | gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/ |
421 | |
422 | memset(gp2x_screen15, 0, 320*240*2); gp2x_video_flip(); |
423 | memset(gp2x_screen15, 0, 320*240*2); gp2x_video_flip(); |
424 | |
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425 | //if(bpp==8) gp2x_physvram[2]+=320*240, gp2x_physvram[3]+=320*240, |
426 | // gp2x_logvram15[2]+=320*240/2, gp2x_logvram15[3]+=320*240/2; |
427 | if(bpp==8) gp2x_physvram[2]+=0x20000, gp2x_physvram[3]+=0x20000, |
428 | gp2x_logvram15[2]+=0x20000/2, gp2x_logvram15[3]+=0x20000/2; |
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429 | |
430 | |
431 | if ( gp2x_do_sound) |
432 | { |
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433 | ioctl(gp2x_dev[3], SNDCTL_DSP_SPEED, &rate); |
434 | ioctl(gp2x_dev[3], SNDCTL_DSP_SETFMT, &bits); |
435 | |
436 | ioctl(gp2x_dev[3], SNDCTL_DSP_CHANNELS, &channels); |
437 | ioctl(gp2x_dev[3], SNDCTL_DSP_STEREO, &stereoLocal); |
438 | |
439 | frag = 0x40000|13; |
440 | ioctl(gp2x_dev[3], SNDCTL_DSP_SETFRAGMENT, &frag); |
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441 | |
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442 | { |
443 | // calculate buffer size |
444 | int frag = 0, bsize, buffers = 16; |
445 | bsize = rate / 32; |
446 | if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding |
447 | while ((bsize>>=1)) frag++; |
448 | frag |= buffers<<16; // 16 buffers |
449 | ioctl(gp2x_dev[3], SNDCTL_DSP_SETFRAGMENT, &frag); |
450 | printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n", |
451 | rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff)); |
452 | } |
35868d35 |
453 | |
22f08d95 |
454 | if(first) |
455 | { |
456 | first=0; |
35868d35 |
457 | } |
22f08d95 |
458 | } |
35868d35 |
459 | } |
460 | |
461 | |
462 | extern int fcloseall(void); |
463 | void gp2x_deinit(void) |
464 | { |
465 | while((gp2x_sound++)<1000000); //wait arm920t threads to finish |
466 | |
467 | gp2x_dualcore_registers(0); |
937bf65b |
468 | mmuunhack(); |
35868d35 |
469 | |
470 | gp2x_memregs[0x28DA>>1]=0x4AB; //set video mode |
22f08d95 |
471 | gp2x_memregs[0x290C>>1]=640; |
472 | |
35868d35 |
473 | { int i; for(i=0;i<8;i++) if(gp2x_dev[i]) close(gp2x_dev[i]); } //close all devices |
474 | |
475 | fcloseall(); //close all files |
476 | |
477 | } |
478 | |
22f08d95 |
479 | |
35868d35 |
480 | void SetVideoScaling(int pixels,int width,int height) |
481 | { |
482 | float x, y; |
22f08d95 |
483 | float xscale,yscale=0; |
35868d35 |
484 | |
485 | int bpp=(gp2x_memregs[0x28DA>>1]>>9)&0x3; /* bytes per pixel */ |
486 | |
937bf65b |
487 | scaling_enabled = (width == 320) ? 0 : 1; |
488 | |
35868d35 |
489 | if(gp2x_memregs[0x2800>>1]&0x100) /* TV-Out ON? */ |
490 | { |
491 | xscale=489.0; /* X-Scale with TV-Out (PAL or NTSC) */ |
492 | if (gp2x_memregs[0x2818>>1] == 287) /* PAL? */ |
493 | yscale=(pixels*274.0)/320.0; /* Y-Scale with PAL */ |
494 | else if (gp2x_memregs[0x2818>>1] == 239) /* NTSC? */ |
495 | yscale=(pixels*331.0)/320.0; /* Y-Scale with NTSC */ |
496 | } |
22f08d95 |
497 | else /* TV-Out OFF? */ |
35868d35 |
498 | { |
499 | xscale=1024.0; /* X-Scale for LCD */ |
500 | yscale=pixels; /* Y-Scale for LCD */ |
501 | } |
502 | |
503 | x=(xscale*width)/320.0; |
504 | y=(yscale*bpp*height)/240.0; |
505 | gp2x_memregs[0x2906>>1]=(unsigned short)x; /* scale horizontal */ |
506 | gp2x_memregl[0x2908>>2]=(unsigned long)y; /* scale vertical */ |
507 | gp2x_memregs[0x290C>>1]=pixels*bpp; /* Set Video Width */ |
508 | } |