diff options
| author | Mike Pavone <pavone@retrodev.com> | 2013-01-08 09:34:46 -0800 |
|---|---|---|
| committer | Mike Pavone <pavone@retrodev.com> | 2013-01-08 09:34:46 -0800 |
| commit | 15d5c98f388d705e0367e160315ede6baa55c80b (patch) | |
| tree | 4d7f1fbd8c4ec825042049efb2e49dd7ffc50265 | |
| parent | d1a66eaef9d222571655d629534707a1e2c3df64 (diff) | |
Fix rendering of sprites at the top edge of screen
| -rw-r--r-- | vdp.c | 9 |
1 files changed, 5 insertions, 4 deletions
@@ -82,26 +82,27 @@ void scan_sprite_table(uint32_t line, vdp_context * context) //TODO: Read from SAT cache rather than from VRAM uint16_t sat_address = (context->regs[REG_SAT] & 0x7F) << 9; uint16_t address = context->sprite_index * 8 + sat_address; - int16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128; + line += 128; + uint16_t y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]); uint8_t height = ((context->vdpmem[address+2] & 0x3) + 1) * 8; //printf("Sprite %d | y: %d, height: %d\n", context->sprite_index, y, height); if (y <= line && line < (y + height)) { //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line); context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2]; context->sprite_info_list[context->slot_counter].index = context->sprite_index; - context->sprite_info_list[context->slot_counter].y = y; + context->sprite_info_list[context->slot_counter].y = y-128; } context->sprite_index = context->vdpmem[address+3] & 0x7F; if (context->sprite_index && context->slot_counter) { address = context->sprite_index * 8 + sat_address; - y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]) - 128; + y = ((context->vdpmem[address] & 0x3) << 8 | context->vdpmem[address+1]); height = ((context->vdpmem[address+2] & 0x3) + 1) * 8; if (y <= line && line < (y + height)) { //printf("Sprite %d at y: %d with height %d is on line %d\n", context->sprite_index, y, height, line); context->sprite_info_list[--(context->slot_counter)].size = context->vdpmem[address+2]; context->sprite_info_list[context->slot_counter].index = context->sprite_index; - context->sprite_info_list[context->slot_counter].y = y; + context->sprite_info_list[context->slot_counter].y = y-128; } context->sprite_index = context->vdpmem[address+3] & 0x7F; } |