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comparison vdp.c @ 503:eee6be465c47

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Small optimization for H40 mode
author Mike Pavone <pavone@retrodev.com>
date Thu, 31 Oct 2013 00:28:27 -0700
parents 27345a67225d
children b7b7a1cab44a
comparison
equal deleted inserted replaced
502:7fdfcced65b6 503:eee6be465c47
1219 case 170: 1219 case 170:
1220 external_slot(context); 1220 external_slot(context);
1221 break; 1221 break;
1222 } 1222 }
1223 } 1223 }
1224
1225 void vdp_h40_line(uint32_t line, vdp_context * context)
1226 {
1227 context->cur_slot = MAX_DRAWS-1;
1228 memset(context->linebuf, 0, LINEBUF_SIZE);
1229 if (line == 0xFF) {
1230 external_slot(context);
1231 if (context->flags & FLAG_DMA_RUN) {
1232 run_dma_src(context, 0);
1233 }
1234 external_slot(context);
1235 if (context->flags & FLAG_DMA_RUN) {
1236 run_dma_src(context, 0);
1237 }
1238 external_slot(context);
1239 if (context->flags & FLAG_DMA_RUN) {
1240 run_dma_src(context, 0);
1241 }
1242 external_slot(context);
1243 if (context->flags & FLAG_DMA_RUN) {
1244 run_dma_src(context, 0);
1245 }
1246 } else {
1247 render_sprite_cells(context);
1248 render_sprite_cells(context);
1249 render_sprite_cells(context);
1250 render_sprite_cells(context);
1251 }
1252 context->sprite_index = 0x80;
1253 context->slot_counter = MAX_SPRITES_LINE;
1254 for (int i = 0; i < 19; i++)
1255 {
1256 render_sprite_cells(context);
1257 scan_sprite_table(line, context);
1258 }
1259 external_slot(context);
1260 for (int i = 0; i < 11; i++)
1261 {
1262 render_sprite_cells(context);
1263 scan_sprite_table(line, context);
1264 }
1265 uint16_t address;
1266 uint32_t mask;
1267 address = (context->regs[REG_HSCROLL] & 0x3F) << 10;
1268 mask = 0;
1269 if (context->regs[REG_MODE_3] & 0x2) {
1270 mask |= 0xF8;
1271 }
1272 if (context->regs[REG_MODE_3] & 0x1) {
1273 mask |= 0x7;
1274 }
1275 address += (line & mask) * 4;
1276 context->hscroll_a = context->vdpmem[address] << 8 | context->vdpmem[address+1];
1277 context->hscroll_b = context->vdpmem[address+2] << 8 | context->vdpmem[address+3];
1278 render_sprite_cells(context);
1279 scan_sprite_table(line, context);
1280 render_sprite_cells(context);
1281 scan_sprite_table(line, context);
1282 render_sprite_cells(context);
1283 scan_sprite_table(line, context);
1284 render_sprite_cells(context);
1285 scan_sprite_table(line, context);
1286
1287 render_sprite_cells(context);
1288 scan_sprite_table(line, context);
1289 read_map_scroll_a(0, line, context);
1290 render_sprite_cells(context);
1291 scan_sprite_table(line, context);
1292 render_map_1(context);
1293 scan_sprite_table(line, context);//Just a guess
1294 render_map_2(context);
1295 scan_sprite_table(line, context);//Just a guess
1296 read_map_scroll_b(0, line, context);
1297 render_sprite_cells(context);
1298 scan_sprite_table(line, context);
1299 render_map_3(context);
1300 scan_sprite_table(line, context);//Just a guess
1301 render_map_output(line, 0, context);
1302 scan_sprite_table(line, context);//Just a guess
1303 //reverse context slot counter so it counts the number of sprite slots
1304 //filled rather than the number of available slots
1305 //context->slot_counter = MAX_SPRITES_LINE - context->slot_counter;
1306 context->cur_slot = MAX_SPRITES_LINE-1;
1307 context->sprite_draws = MAX_DRAWS;
1308 context->flags &= (~FLAG_CAN_MASK & ~FLAG_MASKED);
1309 for (int column = 2; column < 42; column += 2)
1310 {
1311 read_map_scroll_a(column, line, context);
1312 external_slot(context);
1313 if (context->flags & FLAG_DMA_RUN) {
1314 run_dma_src(context, 0);
1315 }
1316 render_map_1(context);
1317 render_map_2(context);
1318 read_map_scroll_b(column, line, context);
1319 read_sprite_x(line, context);
1320 render_map_3(context);
1321 render_map_output(line, column, context);
1322
1323 column += 2;
1324 read_map_scroll_a(column, line, context);
1325 external_slot(context);
1326 if (context->flags & FLAG_DMA_RUN) {
1327 run_dma_src(context, 0);
1328 }
1329 render_map_1(context);
1330 render_map_2(context);
1331 read_map_scroll_b(column, line, context);
1332 read_sprite_x(line, context);
1333 render_map_3(context);
1334 render_map_output(line, column, context);
1335
1336 column += 2;
1337 read_map_scroll_a(column, line, context);
1338 external_slot(context);
1339 if (context->flags & FLAG_DMA_RUN) {
1340 run_dma_src(context, 0);
1341 }
1342 render_map_1(context);
1343 render_map_2(context);
1344 read_map_scroll_b(column, line, context);
1345 read_sprite_x(line, context);
1346 render_map_3(context);
1347 render_map_output(line, column, context);
1348
1349 column += 2;
1350 read_map_scroll_a(column, line, context);
1351 render_map_1(context);
1352 render_map_2(context);
1353 read_map_scroll_b(column, line, context);
1354 read_sprite_x(line, context);
1355 render_map_3(context);
1356 render_map_output(line, column, context);
1357 }
1358 external_slot(context);
1359 if (context->flags & FLAG_DMA_RUN) {
1360 run_dma_src(context, 0);
1361 }
1362 external_slot(context);
1363 }
1364
1224 void latch_mode(vdp_context * context) 1365 void latch_mode(vdp_context * context)
1225 { 1366 {
1226 context->latched_mode = (context->regs[REG_MODE_4] & 0x81) | (context->regs[REG_MODE_2] & BIT_PAL); 1367 context->latched_mode = (context->regs[REG_MODE_4] & 0x81) | (context->regs[REG_MODE_2] & BIT_PAL);
1227 } 1368 }
1228 1369
1388 //it's used for gathering sprite info for line 1529 //it's used for gathering sprite info for line
1389 line = (line - 1) & 0xFF; 1530 line = (line - 1) & 0xFF;
1390 1531
1391 //Convert to slot number 1532 //Convert to slot number
1392 if (context->latched_mode & BIT_H40){ 1533 if (context->latched_mode & BIT_H40){
1393 vdp_h40(line, slot, context); 1534 if (!slot && line != (active_lines-1) && (target_cycles - context->cycles) >= MCLKS_LINE) {
1535 vdp_h40_line(line, context);
1536 inccycles = MCLKS_LINE;
1537 } else {
1538 vdp_h40(line, slot, context);
1539 }
1394 } else { 1540 } else {
1395 vdp_h32(line, slot, context); 1541 vdp_h32(line, slot, context);
1396 } 1542 }
1397 } else { 1543 } else {
1398 if (!is_refresh(context, slot)) { 1544 if (!is_refresh(context, slot)) {