diff options
Diffstat (limited to 'ppu.c')
| -rw-r--r-- | ppu.c | 11 |
1 files changed, 6 insertions, 5 deletions
@@ -35,7 +35,6 @@ static inline void ppu_evaluate_sprites(struct nes_state *state) { dst[2] = src[2]; dst[3] = src[3]; ppu->sprite_indexes[n] = i; - ppu->sprite_zero_hit_possible |= (i == 0); dst += 4; n++; @@ -115,6 +114,11 @@ static inline void ppu_render_pixel(struct nes_state *state) { uint8_t bg_mask = (ppu->reg_mask & 0x08) ? 0xff : 0x00; uint8_t sp_mask = (ppu->reg_mask & 0x10) ? 0xff : 0x00; + // uint8_t left_mask = (x >= 8) ? 0xff : 0x00; + // bg_mask &= ((ppu->reg_mask & 0x02) ? 0xff : 0x00) | left_mask; + // sp_mask &= ((ppu->reg_mask & 0x04) ? 0xff : 0x00) | left_mask; + + // Background uint8_t p0 = !!(ppu->bg_shift_pattern_low & bit); uint8_t p1 = !!(ppu->bg_shift_pattern_high & bit); @@ -151,9 +155,7 @@ static inline void ppu_render_pixel(struct nes_state *state) { case 1: { palette_index = 0x10 | sp_index; } break; case 2: { palette_index = bg_index; } break; case 3: { - if(sp_zero && ppu->sprite_zero_hit_possible && x < 255) { - ppu->reg_status |= 0x40; - } + ppu->reg_status |= (sp_zero && x < 255) ? 0x40 : 0; // NOTE(peter): Sprite zero hit! palette_index = (sp_prio) ? bg_index : 0x10 | sp_index; } break; } @@ -395,7 +397,6 @@ static void ppu_tick(struct nes_state *state) { if(UNLIKELY(scanline == 261) && dot == 1) { ppu->reg_status &= ~0x80; ppu->reg_status &= ~0x40; - ppu->sprite_zero_hit_possible = 0; } dot++; |