diff options
Diffstat (limited to 'vdp.c')
| -rw-r--r-- | vdp.c | 80 |
1 files changed, 74 insertions, 6 deletions
@@ -16,6 +16,11 @@ #define SCROLL_BUFFER_SIZE 32 #define SCROLL_BUFFER_DRAW 16 +#define FLAG_DOT_OFLOW 0x1 +#define FLAG_CAN_MASK 0x2 +#define FLAG_MASKED 0x4 +#define FLAG_WINDOW 0x8 + void init_vdp_context(vdp_context * context) { memset(context, 0, sizeof(context)); @@ -100,9 +105,6 @@ void scan_sprite_table(uint32_t line, vdp_context * context) } } -#define FLAG_DOT_OFLOW 0x1 -#define FLAG_CAN_MASK 0x2 -#define FLAG_MASKED 0x4 void read_sprite_x(uint32_t line, vdp_context * context) { if (context->cur_slot >= context->slot_counter) { @@ -171,8 +173,67 @@ void external_slot(vdp_context * context) //TODO: Implement me } +#define WINDOW_RIGHT 0x80 +#define WINDOW_DOWN 0x80 +#define ALWAYS_WINDOW 0 + void read_map_scroll(uint16_t column, uint16_t vsram_off, uint32_t line, uint16_t address, uint16_t hscroll_val, vdp_context * context) { + if (!vsram_off) { + uint16_t left_col, right_col; + #if ALWAYS_WINDOW + left_col = 0; right_col = 42; + uint16_t top_line, bottom_line; + top_line = 0; bottom_line = 241; + #else + if (context->regs[REG_WINDOW_H] & WINDOW_RIGHT) { + left_col = 0; + right_col = (context->regs[REG_WINDOW_H] & 0x1F) * 2; + if (right_col) { + right_col += 2; + } + } else { + left_col = (context->regs[REG_WINDOW_H] & 0x1F) * 2; + right_col = 42; + } + if (column >= left_col && column < right_col) { + uint16_t top_line, bottom_line; + if (context->regs[REG_WINDOW_V] & WINDOW_DOWN) { + top_line = (context->regs[REG_WINDOW_V] & 0x1F) * 8; + bottom_line = 241; + } else { + top_line = 0; + bottom_line = (context->regs[REG_WINDOW_V] & 0x1F) * 8; + } + if (line >= top_line && line < bottom_line) { + #endif + uint16_t address = context->regs[REG_WINDOW] << 10; + uint16_t line_offset, offset, mask; + if (context->latched_mode & BIT_H40) { + address &= 0xF000; + line_offset = (((line/* - top_line */) / 8) * 64 * 2) & 0xFFF; + mask = 0x7F; + + } else { + address &= 0xF800; + line_offset = (((line/* - top_line*/) / 8) * 32 * 2) & 0xFFF; + mask = 0x3F; + } + offset = address + line_offset + (((column - 2/* - left_col*/) * 2) & mask); + context->col_1 = (context->vdpmem[offset] << 8) | context->vdpmem[offset+1]; + printf("Window | top: %d, bot: %d, left: %d, right: %d, base: %X, line: %X offset: %X, tile: %X, reg: %X\n", top_line, bottom_line, left_col, right_col, address, line_offset, offset, ((context->col_1 & 0x3FF) << 5), context->regs[REG_WINDOW]); + offset = address + line_offset + (((column - 1/* - left_col*/) * 2) & mask); + context->col_2 = (context->vdpmem[offset] << 8) | context->vdpmem[offset+1]; + context->v_offset = (line/* - top_line*/) & 0x7; + context->flags |= FLAG_WINDOW; + return; + #if !ALWAYS_WINDOW + } + } + context->flags &= ~FLAG_WINDOW; + #endif + + } uint16_t vscroll; switch(context->regs[REG_SCROLL] & 0x30) { @@ -293,7 +354,11 @@ void render_map_output(uint32_t line, int32_t col, vdp_context * context) col-=2; dst = context->framebuf + line * 320 + col * 8; sprite_buf = context->linebuf + col * 8; - plane_a = context->tmp_buf_a + SCROLL_BUFFER_DRAW - (context->hscroll_a & 0xF); + if (context->flags & FLAG_WINDOW) { + plane_a = context->tmp_buf_a + SCROLL_BUFFER_DRAW; + } else { + plane_a = context->tmp_buf_a + SCROLL_BUFFER_DRAW - (context->hscroll_a & 0xF); + } plane_b = context->tmp_buf_b + SCROLL_BUFFER_DRAW - (context->hscroll_b & 0xF); end = dst + 16; //printf("A | tmp_buf offset: %d\n", 8 - (context->hscroll_a & 0x7)); @@ -324,8 +389,11 @@ void render_map_output(uint32_t line, int32_t col, vdp_context * context) //end = dst + 8; } - uint16_t remaining = context->hscroll_a & 0xF; - memcpy(context->tmp_buf_a + SCROLL_BUFFER_DRAW - remaining, context->tmp_buf_a + SCROLL_BUFFER_SIZE - remaining, remaining); + uint16_t remaining; + if (!(context->flags & FLAG_WINDOW)) { + remaining = context->hscroll_a & 0xF; + memcpy(context->tmp_buf_a + SCROLL_BUFFER_DRAW - remaining, context->tmp_buf_a + SCROLL_BUFFER_SIZE - remaining, remaining); + } remaining = context->hscroll_b & 0xF; memcpy(context->tmp_buf_b + SCROLL_BUFFER_DRAW - remaining, context->tmp_buf_b + SCROLL_BUFFER_SIZE - remaining, remaining); } |