hw/tcx.c

   1 /*
   2  * QEMU TCX Frame buffer
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25
  26 #define MAXX 1024
  27 #define MAXY 768
  28 #define TCX_DAC_NREGS 16
  29
  30 typedef struct TCXState {
  31     uint32_t addr;
  32     DisplayState *ds;
  33     uint8_t *vram;
  34     ram_addr_t vram_offset;
  35     uint16_t width, height;
  36     uint8_t r[256], g[256], b[256];
  37     uint32_t palette[256];
  38     uint8_t dac_index, dac_state;
  39 } TCXState;
  40
  41 static void tcx_screen_dump(void *opaque, const char *filename);
  42
  43 /* XXX: unify with vga draw line functions */
  44 static inline unsigned int rgb_to_pixel8(unsigned int r, unsigned int g, unsigned b)
  45 {
  46     return ((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6);
  47 }
  48
  49 static inline unsigned int rgb_to_pixel15(unsigned int r, unsigned int g, unsigned b)
  50 {
  51     return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
  52 }
  53
  54 static inline unsigned int rgb_to_pixel16(unsigned int r, unsigned int g, unsigned b)
  55 {
  56     return ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
  57 }
  58
  59 static inline unsigned int rgb_to_pixel32(unsigned int r, unsigned int g, unsigned b)
  60 {
  61     return (r << 16) | (g << 8) | b;
  62 }
  63
  64 static void update_palette_entries(TCXState *s, int start, int end)
  65 {
  66     int i;
  67     for(i = start; i < end; i++) {
  68         switch(s->ds->depth) {
  69         default:
  70         case 8:
  71             s->palette[i] = rgb_to_pixel8(s->r[i], s->g[i], s->b[i]);
  72             break;
  73         case 15:
  74             s->palette[i] = rgb_to_pixel15(s->r[i], s->g[i], s->b[i]);
  75             break;
  76         case 16:
  77             s->palette[i] = rgb_to_pixel16(s->r[i], s->g[i], s->b[i]);
  78             break;
  79         case 32:
  80             s->palette[i] = rgb_to_pixel32(s->r[i], s->g[i], s->b[i]);
  81             break;
  82         }
  83     }
  84 }
  85
  86 static void tcx_draw_line32(TCXState *s1, uint8_t *d,
  87                             const uint8_t *s, int width)
  88 {
  89     int x;
  90     uint8_t val;
  91     uint32_t *p = (uint32_t *)d;
  92
  93     for(x = 0; x < width; x++) {
  94         val = *s++;
  95         *p++ = s1->palette[val];
  96     }
  97 }
  98
  99 static void tcx_draw_line16(TCXState *s1, uint8_t *d,
 100                             const uint8_t *s, int width)
 101 {
 102     int x;
 103     uint8_t val;
 104     uint16_t *p = (uint16_t *)d;
 105
 106     for(x = 0; x < width; x++) {
 107         val = *s++;
 108         *p++ = s1->palette[val];
 109     }
 110 }
 111
 112 static void tcx_draw_line8(TCXState *s1, uint8_t *d,
 113                            const uint8_t *s, int width)
 114 {
 115     int x;
 116     uint8_t val;
 117
 118     for(x = 0; x < width; x++) {
 119         val = *s++;
 120         *d++ = s1->palette[val];
 121     }
 122 }
 123
 124 /* Fixed line length 1024 allows us to do nice tricks not possible on
 125    VGA... */
 126 static void tcx_update_display(void *opaque)
 127 {
 128     TCXState *ts = opaque;
 129     ram_addr_t page, page_min, page_max;
 130     int y, y_start, dd, ds;
 131     uint8_t *d, *s;
 132     void (*f)(TCXState *s1, uint8_t *d, const uint8_t *s, int width);
 133
 134     if (ts->ds->depth == 0)
 135         return;
 136     page = ts->vram_offset;
 137     y_start = -1;
 138     page_min = 0xffffffff;
 139     page_max = 0;
 140     d = ts->ds->data;
 141     s = ts->vram;
 142     dd = ts->ds->linesize;
 143     ds = 1024;
 144
 145     switch (ts->ds->depth) {
 146     case 32:
 147         f = tcx_draw_line32;
 148         break;
 149     case 15:
 150     case 16:
 151         f = tcx_draw_line16;
 152         break;
 153     default:
 154     case 8:
 155         f = tcx_draw_line8;
 156         break;
 157     case 0:
 158         return;
 159     }
 160
 161     for(y = 0; y < ts->height; y += 4, page += TARGET_PAGE_SIZE) {
 162         if (cpu_physical_memory_get_dirty(page, VGA_DIRTY_FLAG)) {
 163             if (y_start < 0)
 164                 y_start = y;
 165             if (page < page_min)
 166                 page_min = page;
 167             if (page > page_max)
 168                 page_max = page;
 169             f(ts, d, s, ts->width);
 170             d += dd;
 171             s += ds;
 172             f(ts, d, s, ts->width);
 173             d += dd;
 174             s += ds;
 175             f(ts, d, s, ts->width);
 176             d += dd;
 177             s += ds;
 178             f(ts, d, s, ts->width);
 179             d += dd;
 180             s += ds;
 181         } else {
 182             if (y_start >= 0) {
 183                 /* flush to display */
 184                 dpy_update(ts->ds, 0, y_start,
 185                            ts->width, y - y_start);
 186                 y_start = -1;
 187             }
 188             d += dd * 4;
 189             s += ds * 4;
 190         }
 191     }
 192     if (y_start >= 0) {
 193         /* flush to display */
 194         dpy_update(ts->ds, 0, y_start,
 195                    ts->width, y - y_start);
 196     }
 197     /* reset modified pages */
 198     if (page_min <= page_max) {
 199         cpu_physical_memory_reset_dirty(page_min, page_max + TARGET_PAGE_SIZE,
 200                                         VGA_DIRTY_FLAG);
 201     }
 202 }
 203
 204 static void tcx_invalidate_display(void *opaque)
 205 {
 206     TCXState *s = opaque;
 207     int i;
 208
 209     for (i = 0; i < MAXX*MAXY; i += TARGET_PAGE_SIZE) {
 210         cpu_physical_memory_set_dirty(s->vram_offset + i);
 211     }
 212 }
 213
 214 static void tcx_save(QEMUFile *f, void *opaque)
 215 {
 216     TCXState *s = opaque;
 217
 218     qemu_put_be32s(f, (uint32_t *)&s->addr);
 219     qemu_put_be32s(f, (uint32_t *)&s->vram);
 220     qemu_put_be16s(f, (uint16_t *)&s->height);
 221     qemu_put_be16s(f, (uint16_t *)&s->width);
 222     qemu_put_buffer(f, s->r, 256);
 223     qemu_put_buffer(f, s->g, 256);
 224     qemu_put_buffer(f, s->b, 256);
 225     qemu_put_8s(f, &s->dac_index);
 226     qemu_put_8s(f, &s->dac_state);
 227 }
 228
 229 static int tcx_load(QEMUFile *f, void *opaque, int version_id)
 230 {
 231     TCXState *s = opaque;
 232
 233     if (version_id != 1)
 234         return -EINVAL;
 235
 236     qemu_get_be32s(f, (uint32_t *)&s->addr);
 237     qemu_get_be32s(f, (uint32_t *)&s->vram);
 238     qemu_get_be16s(f, (uint16_t *)&s->height);
 239     qemu_get_be16s(f, (uint16_t *)&s->width);
 240     qemu_get_buffer(f, s->r, 256);
 241     qemu_get_buffer(f, s->g, 256);
 242     qemu_get_buffer(f, s->b, 256);
 243     qemu_get_8s(f, &s->dac_index);
 244     qemu_get_8s(f, &s->dac_state);
 245     update_palette_entries(s, 0, 256);
 246     tcx_invalidate_display(s);
 247
 248     return 0;
 249 }
 250
 251 static void tcx_reset(void *opaque)
 252 {
 253     TCXState *s = opaque;
 254
 255     /* Initialize palette */
 256     memset(s->r, 0, 256);
 257     memset(s->g, 0, 256);
 258     memset(s->b, 0, 256);
 259     s->r[255] = s->g[255] = s->b[255] = 255;
 260     update_palette_entries(s, 0, 256);
 261     memset(s->vram, 0, MAXX*MAXY);
 262     cpu_physical_memory_reset_dirty(s->vram_offset, s->vram_offset + MAXX*MAXY,
 263                                     VGA_DIRTY_FLAG);
 264     s->dac_index = 0;
 265     s->dac_state = 0;
 266 }
 267
 268 static uint32_t tcx_dac_readl(void *opaque, target_phys_addr_t addr)
 269 {
 270     return 0;
 271 }
 272
 273 static void tcx_dac_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 274 {
 275     TCXState *s = opaque;
 276     uint32_t saddr;
 277
 278     saddr = (addr & (TCX_DAC_NREGS - 1)) >> 2;
 279     switch (saddr) {
 280     case 0:
 281         s->dac_index = val >> 24;
 282         s->dac_state = 0;
 283         break;
 284     case 1:
 285         switch (s->dac_state) {
 286         case 0:
 287             s->r[s->dac_index] = val >> 24;
 288             update_palette_entries(s, s->dac_index, s->dac_index + 1);
 289             s->dac_state++;
 290             break;
 291         case 1:
 292             s->g[s->dac_index] = val >> 24;
 293             update_palette_entries(s, s->dac_index, s->dac_index + 1);
 294             s->dac_state++;
 295             break;
 296         case 2:
 297             s->b[s->dac_index] = val >> 24;
 298             update_palette_entries(s, s->dac_index, s->dac_index + 1);
 299             s->dac_index = (s->dac_index + 1) & 255; // Index autoincrement
 300         default:
 301             s->dac_state = 0;
 302             break;
 303         }
 304         break;
 305     default:
 306         break;
 307     }
 308     return;
 309 }
 310
 311 static CPUReadMemoryFunc *tcx_dac_read[3] = {
 312     tcx_dac_readl,
 313     tcx_dac_readl,
 314     tcx_dac_readl,
 315 };
 316
 317 static CPUWriteMemoryFunc *tcx_dac_write[3] = {
 318     tcx_dac_writel,
 319     tcx_dac_writel,
 320     tcx_dac_writel,
 321 };
 322
 323 void tcx_init(DisplayState *ds, uint32_t addr, uint8_t *vram_base,
 324               unsigned long vram_offset, int vram_size, int width, int height)
 325 {
 326     TCXState *s;
 327     int io_memory;
 328
 329     s = qemu_mallocz(sizeof(TCXState));
 330     if (!s)
 331         return;
 332     s->ds = ds;
 333     s->addr = addr;
 334     s->vram = vram_base;
 335     s->vram_offset = vram_offset;
 336     s->width = width;
 337     s->height = height;
 338
 339     cpu_register_physical_memory(addr + 0x800000, vram_size, vram_offset);
 340     io_memory = cpu_register_io_memory(0, tcx_dac_read, tcx_dac_write, s);
 341     cpu_register_physical_memory(addr + 0x200000, TCX_DAC_NREGS, io_memory);
 342
 343     graphic_console_init(s->ds, tcx_update_display, tcx_invalidate_display,
 344                          tcx_screen_dump, s);
 345     register_savevm("tcx", addr, 1, tcx_save, tcx_load, s);
 346     qemu_register_reset(tcx_reset, s);
 347     tcx_reset(s);
 348     dpy_resize(s->ds, width, height);
 349 }
 350
 351 static void tcx_screen_dump(void *opaque, const char *filename)
 352 {
 353     TCXState *s = opaque;
 354     FILE *f;
 355     uint8_t *d, *d1, v;
 356     int y, x;
 357
 358     f = fopen(filename, "wb");
 359     if (!f)
 360         return;
 361     fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
 362     d1 = s->vram;
 363     for(y = 0; y < s->height; y++) {
 364         d = d1;
 365         for(x = 0; x < s->width; x++) {
 366             v = *d;
 367             fputc(s->r[v], f);
 368             fputc(s->g[v], f);
 369             fputc(s->b[v], f);
 370             d++;
 371         }
 372         d1 += MAXX;
 373     }
 374     fclose(f);
 375     return;
 376 }
 377
 378
 379