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comparison vdp.c @ 2508:caf92f1b7b76

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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
comparison
equal deleted inserted replaced
2507:aa888682faa0 2508:caf92f1b7b76
1581 } 1581 }
1582 } 1582 }
1583 1583
1584 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) 1584 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)
1585 { 1585 {
1586 uint8_t pixel;
1586 if (output_disabled) { 1587 if (output_disabled) {
1587 switch (test_layer) 1588 switch (test_layer)
1588 { 1589 {
1589 case 0: 1590 case 0:
1591 pixel = context->regs[REG_BG_COLOR] & 0x3F;
1590 for (int i = 0; i < 16; i++) 1592 for (int i = 0; i < 16; i++)
1591 { 1593 {
1592 *(dst++) = 0x3F; //TODO: confirm this on hardware 1594 *(dst++) = pixel; //TODO: confirm this on hardware
1593 *(debug_dst++) = DBG_SRC_BG; 1595 *(debug_dst++) = DBG_SRC_BG;
1594 } 1596 }
1595 break; 1597 break;
1596 case 1: { 1598 case 1: {
1597 uint8_t *sprite_buf = context->linebuf + col * 8; 1599 uint8_t *sprite_buf = context->linebuf + col * 8;
1620 } else { 1622 } else {
1621 int start = 0; 1623 int start = 0;
1622 uint8_t *sprite_buf = context->linebuf + col * 8; 1624 uint8_t *sprite_buf = context->linebuf + col * 8;
1623 if (!col && (context->regs[REG_MODE_1] & BIT_COL0_MASK)) { 1625 if (!col && (context->regs[REG_MODE_1] & BIT_COL0_MASK)) {
1624 //TODO: Confirm how test register interacts with column 0 blanking 1626 //TODO: Confirm how test register interacts with column 0 blanking
1625 uint8_t pixel = 0x3F; 1627 pixel = 0x3F;
1626 uint8_t src = DBG_SRC_BG; 1628 uint8_t src = DBG_SRC_BG;
1627 for (int i = 0; i < 8; ++i) 1629 for (int i = 0; i < 8; ++i)
1628 { 1630 {
1629 switch (test_layer) 1631 switch (test_layer)
1630 { 1632 {
1660 { 1662 {
1661 uint8_t sprite, plane_a, plane_b; 1663 uint8_t sprite, plane_a, plane_b;
1662 plane_a = buf_a[plane_a_off & plane_a_mask]; 1664 plane_a = buf_a[plane_a_off & plane_a_mask];
1663 plane_b = context->tmp_buf_b[plane_b_off & SCROLL_BUFFER_MASK]; 1665 plane_b = context->tmp_buf_b[plane_b_off & SCROLL_BUFFER_MASK];
1664 sprite = *sprite_buf; 1666 sprite = *sprite_buf;
1665 uint8_t pixel = composite_normal(context, debug_dst, sprite, plane_a, plane_b, 0x3F) & 0x3F; 1667 pixel = composite_normal(context, debug_dst, sprite, plane_a, plane_b, 0x3F) & 0x3F;
1666 switch (test_layer) 1668 switch (test_layer)
1667 { 1669 {
1668 case 1: 1670 case 1:
1669 pixel &= sprite; 1671 pixel &= sprite;
1670 if (pixel) { 1672 if (pixel) {
1742 } else { 1744 } else {
1743 pixel.index &= 0x3F; 1745 pixel.index &= 0x3F;
1744 } 1746 }
1745 switch (test_layer) 1747 switch (test_layer)
1746 { 1748 {
1749 case 0:
1750 if (output_disabled) {
1751 pixel.index &= context->regs[REG_BG_COLOR];
1752 *debug_dst = DBG_SRC_BG;
1753 }
1754 break;
1747 case 1: 1755 case 1:
1748 pixel.index &= sprite; 1756 pixel.index &= sprite;
1749 if (pixel.index) { 1757 if (pixel.index) {
1750 *debug_dst = DBG_SRC_S; 1758 *debug_dst = DBG_SRC_S;
1751 } 1759 }