mirror of https://github.com/bsnes-emu/bsnes.git
234 lines
7.9 KiB
C++
234 lines
7.9 KiB
C++
auto PPU::update_sprite_list(uint addr, uint8 data) -> void {
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if(addr < 0x0200) {
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unsigned i = addr >> 2;
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switch(addr & 3) {
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case 0: sprite_list[i].x = (sprite_list[i].x & 0x0100) | data; break;
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case 1: sprite_list[i].y = (data + 1) & 0xff; break;
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case 2: sprite_list[i].character = data; break;
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case 3: sprite_list[i].vflip = data & 0x80;
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sprite_list[i].hflip = data & 0x40;
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sprite_list[i].priority = (data >> 4) & 3;
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sprite_list[i].palette = (data >> 1) & 7;
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sprite_list[i].use_nameselect = data & 0x01;
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}
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} else {
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unsigned i = (addr & 0x1f) << 2;
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sprite_list[i + 0].x = ((data & 0x01) << 8) | (sprite_list[i + 0].x & 0xff);
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sprite_list[i + 0].size = data & 0x02;
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sprite_list[i + 1].x = ((data & 0x04) << 6) | (sprite_list[i + 1].x & 0xff);
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sprite_list[i + 1].size = data & 0x08;
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sprite_list[i + 2].x = ((data & 0x10) << 4) | (sprite_list[i + 2].x & 0xff);
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sprite_list[i + 2].size = data & 0x20;
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sprite_list[i + 3].x = ((data & 0x40) << 2) | (sprite_list[i + 3].x & 0xff);
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sprite_list[i + 3].size = data & 0x80;
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}
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}
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auto PPU::build_sprite_list() -> void {
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if(sprite_list_valid == true) return;
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sprite_list_valid = true;
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for(unsigned i = 0; i < 128; i++) {
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const bool size = sprite_list[i].size;
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switch(cache.oam_basesize) {
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case 0: sprite_list[i].width = (!size) ? 8 : 16;
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sprite_list[i].height = (!size) ? 8 : 16;
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break;
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case 1: sprite_list[i].width = (!size) ? 8 : 32;
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sprite_list[i].height = (!size) ? 8 : 32;
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break;
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case 2: sprite_list[i].width = (!size) ? 8 : 64;
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sprite_list[i].height = (!size) ? 8 : 64;
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break;
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case 3: sprite_list[i].width = (!size) ? 16 : 32;
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sprite_list[i].height = (!size) ? 16 : 32;
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break;
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case 4: sprite_list[i].width = (!size) ? 16 : 64;
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sprite_list[i].height = (!size) ? 16 : 64;
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break;
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case 5: sprite_list[i].width = (!size) ? 32 : 64;
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sprite_list[i].height = (!size) ? 32 : 64;
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break;
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case 6: sprite_list[i].width = (!size) ? 16 : 32;
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sprite_list[i].height = (!size) ? 32 : 64;
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if(regs.oam_interlace && !size) sprite_list[i].height = 16;
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//32x64 height is not affected by oam_interlace setting
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break;
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case 7: sprite_list[i].width = (!size) ? 16 : 32;
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sprite_list[i].height = (!size) ? 32 : 32;
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if(regs.oam_interlace && !size) sprite_list[i].height = 16;
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break;
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}
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}
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}
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auto PPU::is_sprite_on_scanline() -> bool {
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//if sprite is entirely offscreen and doesn't wrap around to the left side of the screen,
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//then it is not counted. this *should* be 256, and not 255, even though dot 256 is offscreen.
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sprite_item* spr = &sprite_list[active_sprite];
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if(spr->x > 256 && (spr->x + spr->width - 1) < 512) return false;
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int spr_height = (regs.oam_interlace == false) ? (spr->height) : (spr->height >> 1);
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if(line >= spr->y && line < (spr->y + spr_height)) return true;
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if((spr->y + spr_height) >= 256 && line < ((spr->y + spr_height) & 255)) return true;
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return false;
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}
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auto PPU::load_oam_tiles() -> void {
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sprite_item* spr = &sprite_list[active_sprite];
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uint16 tile_width = spr->width >> 3;
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int x = spr->x;
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int y = (line - spr->y) & 0xff;
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if(regs.oam_interlace == true) {
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y <<= 1;
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}
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if(spr->vflip == true) {
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if(spr->width == spr->height) {
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y = (spr->height - 1) - y;
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} else {
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y = (y < spr->width) ? ((spr->width - 1) - y) : (spr->width + ((spr->width - 1) - (y - spr->width)));
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}
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}
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if(regs.oam_interlace == true) {
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y = (spr->vflip == false) ? (y + field()) : (y - field());
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}
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x &= 511;
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y &= 255;
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uint16 tdaddr = cache.oam_tdaddr;
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uint16 chrx = (spr->character ) & 15;
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uint16 chry = (spr->character >> 4) & 15;
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if(spr->use_nameselect == true) {
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tdaddr += (256 * 32) + (cache.oam_nameselect << 13);
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}
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chry += (y >> 3);
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chry &= 15;
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chry <<= 4;
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for(unsigned tx = 0; tx < tile_width; tx++) {
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unsigned sx = (x + (tx << 3)) & 511;
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//ignore sprites that are offscreen, x==256 is a special case that loads all tiles in OBJ
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if(x != 256 && sx >= 256 && (sx + 7) < 512) continue;
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if(regs.oam_tilecount++ >= 34) break;
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unsigned n = regs.oam_tilecount - 1;
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oam_tilelist[n].x = sx;
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oam_tilelist[n].y = y;
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oam_tilelist[n].pri = spr->priority;
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oam_tilelist[n].pal = 128 + (spr->palette << 4);
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oam_tilelist[n].hflip = spr->hflip;
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unsigned mx = (spr->hflip == false) ? tx : ((tile_width - 1) - tx);
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unsigned pos = tdaddr + ((chry + ((chrx + mx) & 15)) << 5);
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oam_tilelist[n].tile = (pos >> 5) & 0x07ff;
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}
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}
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auto PPU::render_oam_tile(int tile_num) -> void {
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oam_tileitem* t = &oam_tilelist[tile_num];
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uint8* oam_td = (uint8*)bg_tiledata[COLORDEPTH_16];
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uint8* oam_td_state = (uint8*)bg_tiledata_state[COLORDEPTH_16];
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if(oam_td_state[t->tile] == 1) {
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render_bg_tile<COLORDEPTH_16>(t->tile);
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}
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unsigned sx = t->x;
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uint8* tile_ptr = (uint8*)oam_td + (t->tile << 6) + ((t->y & 7) << 3);
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for(unsigned x = 0; x < 8; x++) {
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sx &= 511;
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if(sx < 256) {
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unsigned col = *(tile_ptr + ((t->hflip == false) ? x : (7 - x)));
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if(col) {
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col += t->pal;
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oam_line_pal[sx] = col;
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oam_line_pri[sx] = t->pri;
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}
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}
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sx++;
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}
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}
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auto PPU::render_line_oam_rto() -> void {
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build_sprite_list();
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regs.oam_itemcount = 0;
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regs.oam_tilecount = 0;
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memset(oam_line_pri, OAM_PRI_NONE, 256);
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memset(oam_itemlist, 0xff, 32);
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for(int s = 0; s < 34; s++) oam_tilelist[s].tile = 0xffff;
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for(int s = 0; s < 128; s++) {
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active_sprite = (s + regs.oam_firstsprite) & 127;
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if(is_sprite_on_scanline() == false) continue;
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if(regs.oam_itemcount++ >= 32) break;
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oam_itemlist[regs.oam_itemcount - 1] = (s + regs.oam_firstsprite) & 127;
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}
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if(regs.oam_itemcount > 0 && oam_itemlist[regs.oam_itemcount - 1] != 0xff) {
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regs.ioamaddr = 0x0200 + (oam_itemlist[regs.oam_itemcount - 1] >> 2);
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}
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for(int s = 31; s >= 0; s--) {
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if(oam_itemlist[s] == 0xff) continue;
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active_sprite = oam_itemlist[s];
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load_oam_tiles();
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}
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regs.time_over |= (regs.oam_tilecount > 34);
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regs.range_over |= (regs.oam_itemcount > 32);
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}
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#define setpixel_main(x) \
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if(pixel_cache[x].pri_main < pri) { \
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pixel_cache[x].pri_main = pri; \
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pixel_cache[x].bg_main = OAM; \
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pixel_cache[x].src_main = get_palette(oam_line_pal[x]); \
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pixel_cache[x].ce_main = (oam_line_pal[x] < 192); \
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}
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#define setpixel_sub(x) \
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if(pixel_cache[x].pri_sub < pri) { \
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pixel_cache[x].pri_sub = pri; \
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pixel_cache[x].bg_sub = OAM; \
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pixel_cache[x].src_sub = get_palette(oam_line_pal[x]); \
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pixel_cache[x].ce_sub = (oam_line_pal[x] < 192); \
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}
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auto PPU::render_line_oam(uint8 pri0_pos, uint8 pri1_pos, uint8 pri2_pos, uint8 pri3_pos) -> void {
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if(layer_enabled[OAM][0] == false) pri0_pos = 0;
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if(layer_enabled[OAM][1] == false) pri1_pos = 0;
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if(layer_enabled[OAM][2] == false) pri2_pos = 0;
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if(layer_enabled[OAM][3] == false) pri3_pos = 0;
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if(pri0_pos + pri1_pos + pri2_pos + pri3_pos == 0) return;
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if(regs.bg_enabled[OAM] == false && regs.bgsub_enabled[OAM] == false) return;
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for(unsigned s = 0; s < 34; s++) {
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if(oam_tilelist[s].tile == 0xffff) continue;
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render_oam_tile(s);
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}
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bool bg_enabled = regs.bg_enabled[OAM];
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bool bgsub_enabled = regs.bgsub_enabled[OAM];
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build_window_tables(OAM);
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uint8* wt_main = window[OAM].main;
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uint8* wt_sub = window[OAM].sub;
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unsigned pri_tbl[4] = { pri0_pos, pri1_pos, pri2_pos, pri3_pos };
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for(int x = 0; x < 256; x++) {
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if(oam_line_pri[x] == OAM_PRI_NONE) continue;
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unsigned pri = pri_tbl[oam_line_pri[x]];
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if(bg_enabled == true && !wt_main[x]) { setpixel_main(x); }
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if(bgsub_enabled == true && !wt_sub[x]) { setpixel_sub(x); }
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}
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}
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#undef setpixel_main
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#undef setpixel_sub
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