Mercurial > repos > blastem
diff vdp.c @ 2508:caf92f1b7b76
Fix behavior of rendering when all planes are disabled via VDP test register (Thanks vladikcomper!)
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Tue, 27 Aug 2024 20:50:31 -0700 |
| parents | 593a4f308335 |
| children | 1102372feaee |
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--- a/vdp.c Wed Aug 14 22:29:11 2024 -0700 +++ b/vdp.c Tue Aug 27 20:50:31 2024 -0700 @@ -1583,13 +1583,15 @@ static void render_testreg(vdp_context *context, int32_t col, uint8_t *dst, uint8_t *debug_dst, uint8_t *buf_a, int plane_a_off, int plane_a_mask, int plane_b_off, uint8_t output_disabled, uint8_t test_layer) { + uint8_t pixel; if (output_disabled) { switch (test_layer) { case 0: + pixel = context->regs[REG_BG_COLOR] & 0x3F; for (int i = 0; i < 16; i++) { - *(dst++) = 0x3F; //TODO: confirm this on hardware + *(dst++) = pixel; //TODO: confirm this on hardware *(debug_dst++) = DBG_SRC_BG; } break; @@ -1622,7 +1624,7 @@ uint8_t *sprite_buf = context->linebuf + col * 8; if (!col && (context->regs[REG_MODE_1] & BIT_COL0_MASK)) { //TODO: Confirm how test register interacts with column 0 blanking - uint8_t pixel = 0x3F; + pixel = 0x3F; uint8_t src = DBG_SRC_BG; for (int i = 0; i < 8; ++i) { @@ -1662,7 +1664,7 @@ plane_a = buf_a[plane_a_off & plane_a_mask]; plane_b = context->tmp_buf_b[plane_b_off & SCROLL_BUFFER_MASK]; sprite = *sprite_buf; - uint8_t pixel = composite_normal(context, debug_dst, sprite, plane_a, plane_b, 0x3F) & 0x3F; + pixel = composite_normal(context, debug_dst, sprite, plane_a, plane_b, 0x3F) & 0x3F; switch (test_layer) { case 1: @@ -1744,6 +1746,12 @@ } switch (test_layer) { + case 0: + if (output_disabled) { + pixel.index &= context->regs[REG_BG_COLOR]; + *debug_dst = DBG_SRC_BG; + } + break; case 1: pixel.index &= sprite; if (pixel.index) {