diff options
Diffstat (limited to 'src/mame/video/ygv608.cpp')
-rw-r--r-- | src/mame/video/ygv608.cpp | 184 |
1 files changed, 82 insertions, 102 deletions
diff --git a/src/mame/video/ygv608.cpp b/src/mame/video/ygv608.cpp index 9198e5c3054..1cbe66bd8b7 100644 --- a/src/mame/video/ygv608.cpp +++ b/src/mame/video/ygv608.cpp @@ -366,6 +366,9 @@ GFXDECODE_END static ADDRESS_MAP_START( regs_map, AS_IO, 8, ygv608_device ) // address pointers + AM_RANGE( 0, 0) AM_READWRITE(pattern_name_table_y_r,pattern_name_table_y_w) + AM_RANGE( 1, 1) AM_READWRITE(pattern_name_table_x_r,pattern_name_table_x_w) + AM_RANGE( 3, 3) AM_READWRITE(sprite_address_r,sprite_address_w) AM_RANGE( 4, 4) AM_READWRITE(scroll_address_r,scroll_address_w) AM_RANGE( 5, 5) AM_READWRITE(palette_address_r,palette_address_w) @@ -1328,23 +1331,21 @@ uint32_t ygv608_device::update_screen(screen_device &screen, bitmap_ind16 &bitma READ8_MEMBER( ygv608_device::pattern_name_table_r ) { int pn = 0; - uint8_t xTile = m_regs.s.r1 & r1_pnx; - uint8_t yTile = m_regs.s.r0 & r0_pny; switch (p0_state_r) { case 0: /* Are we reading from plane B? */ - if (!((m_regs.s.r7 & r7_md) & MD_1PLANE) && (m_regs.s.r0 & r0_b_a)) + if (!((m_regs.s.r7 & r7_md) & MD_1PLANE) && (m_plane_select_access == true)) pattern_name_base_r = ((m_page_y << m_pny_shift) << m_bits16); /* read character from ram */ - pn = pattern_name_base_r + (((yTile << m_pny_shift) + xTile) << m_bits16); + pn = pattern_name_base_r + (((m_ytile_ptr << m_pny_shift) + m_xtile_ptr) << m_bits16); break; case 1: /* read character from ram */ - pn = pattern_name_base_r + (((yTile << m_pny_shift) + xTile) << m_bits16) + 1; + pn = pattern_name_base_r + (((m_ytile_ptr << m_pny_shift) + m_xtile_ptr) << m_bits16) + 1; break; } @@ -1358,7 +1359,7 @@ READ8_MEMBER( ygv608_device::pattern_name_table_r ) pn, m_regs.s.r7 & r7_md, m_regs.s.r8 & r8_pgs, m_page_x, m_page_y, pattern_name_base_r, - xTile, yTile, m_pny_shift, + m_xtile_ptr, m_ytile_ptr, m_pny_shift, m_bits16 ); pn = 0; } @@ -1369,40 +1370,7 @@ READ8_MEMBER( ygv608_device::pattern_name_table_r ) if (p0_state_r == 2) { - if (m_regs.s.r0 & r0_pnya) - { - if (yTile++ == (m_page_y - 1)) - { - yTile = 0; - if (xTile++ == (m_page_x - 1)) - { - xTile = 0; - // we're now off this tile plane, toggle planes - m_regs.s.r0 ^= r0_b_a; - } - } - m_regs.s.r0 &= ~r0_pny; - m_regs.s.r0 |= yTile; - m_regs.s.r1 &= ~r1_pnx; - m_regs.s.r1 |= xTile; - } - else if (m_regs.s.r1 & r1_pnxa) - { - if (xTile++ == (m_page_x - 1)) - { - xTile = 0; - if (yTile++ == (m_page_y - 1)) - { - yTile = 0; - // we're now off this tile plane, toggle planes - m_regs.s.r0 ^= r0_b_a; - } - } - m_regs.s.r0 &= ~r0_pny; - m_regs.s.r0 |= yTile; - m_regs.s.r1 &= ~r1_pnx; - m_regs.s.r1 |= xTile; - } + pattern_name_autoinc_check(); p0_state_r = 0; pattern_name_base_r = 0; } @@ -1503,23 +1471,21 @@ READ8_MEMBER( ygv608_device::system_control_r ) WRITE8_MEMBER(ygv608_device::pattern_name_table_w) { int pn = 0; - uint8_t xTile = m_regs.s.r1 & r1_pnx; - uint8_t yTile = m_regs.s.r0 & r0_pny; switch (p0_state_w) { case 0: /* Are we reading from plane B? */ - if (!((m_regs.s.r7 & r7_md) & MD_1PLANE) && (m_regs.s.r0 & r0_b_a)) + if (!((m_regs.s.r7 & r7_md) & MD_1PLANE) && (m_plane_select_access == true)) pattern_name_base_w = ((m_page_y << m_pny_shift) << m_bits16); /* read character from ram */ - pn = pattern_name_base_w + (((yTile << m_pny_shift) + xTile) << m_bits16); + pn = pattern_name_base_w + (((m_ytile_ptr << m_pny_shift) + m_xtile_ptr) << m_bits16); break; case 1: /* read character from ram */ - pn = pattern_name_base_w + (((yTile << m_pny_shift) + xTile) << m_bits16) + 1; + pn = pattern_name_base_w + (((m_ytile_ptr << m_pny_shift) + m_xtile_ptr) << m_bits16) + 1; break; } @@ -1533,7 +1499,7 @@ WRITE8_MEMBER(ygv608_device::pattern_name_table_w) pn, m_regs.s.r7 & r7_md, m_regs.s.r8 & r8_pgs, m_page_x, m_page_y, pattern_name_base_w, - xTile, yTile, m_pny_shift, + m_xtile_ptr, m_ytile_ptr, m_pny_shift, m_bits16 ); pn = 0; } @@ -1546,42 +1512,47 @@ WRITE8_MEMBER(ygv608_device::pattern_name_table_w) if (p0_state_w == 2) { - if (m_regs.s.r0 & r0_pnya) + pattern_name_autoinc_check(); + p0_state_w = 0; + pattern_name_base_w = 0; + } +} + +inline void ygv608_device::pattern_name_autoinc_check() +{ + uint8_t xTile = m_xtile_ptr; + uint8_t yTile = m_ytile_ptr; + + if (m_ytile_autoinc == true) + { + // we are incrementing in Y direction + if (yTile++ == (m_page_y - 1)) { - if (yTile++ == (m_page_y - 1)) + yTile = 0; + if (xTile++ == (m_page_x - 1)) { - yTile = 0; - if (xTile++ == (m_page_x - 1)) - { - xTile = 0; - m_regs.s.r0 ^= r0_b_a; - } + xTile = 0; + m_plane_select_access ^= 1; // flip A/B plane } - m_regs.s.r0 &= ~r0_pny; - m_regs.s.r0 |= yTile; - m_regs.s.r1 &= ~r1_pnx; - m_regs.s.r1 |= xTile; } - else if (m_regs.s.r1 & r1_pnxa) + m_ytile_ptr = yTile; + m_xtile_ptr = xTile; + } + else if (m_xtile_autoinc == true) + { + // we are incrementing in X direction + if (xTile++ == (m_page_x - 1)) { - if (xTile++ == (m_page_x - 1)) + xTile = 0; + if (yTile++ == (m_page_y - 1)) { - xTile = 0; - if (yTile++ == (m_page_y - 1)) - { - yTile = 0; - m_regs.s.r0 ^= r0_b_a; - } + yTile = 0; + m_plane_select_access ^= 1; // flip A/B plane } - m_regs.s.r0 &= ~r0_pny; - m_regs.s.r0 |= yTile; - m_regs.s.r1 &= ~r1_pnx; - m_regs.s.r1 |= xTile; } - p0_state_w = 0; - pattern_name_base_w = 0; + m_ytile_ptr = yTile; + m_xtile_ptr = xTile; } - } // P#1W - sprite data port @@ -1776,6 +1747,42 @@ void ygv608_device::HandleRomTransfers(uint8_t type) * ****************************************/ + // R#0R - Pattern Name Table Access pointer Y +READ8_MEMBER( ygv608_device::pattern_name_table_y_r ) +{ + return ((m_xtile_autoinc == true) << 7) | ((m_plane_select_access == true) << 6) | m_xtile_ptr; +} + + // R#0W - Pattern Name Table Access pointer Y +WRITE8_MEMBER( ygv608_device::pattern_name_table_y_w ) +{ + m_ytile_ptr = data & 0x3f; + //if (yTile >= m_page_y) + // logerror ("%s:setting pny(%d) >= page_y(%d)\n", machine().describe_context(), + // yTile, m_page_y ); + m_ytile_ptr &= m_page_y -1; + m_ytile_autoinc = BIT(data,7); + m_plane_select_access = BIT(data,6); +} + + // R#1R - Pattern Name Table Access pointer X +READ8_MEMBER( ygv608_device::pattern_name_table_x_r ) +{ + return ((m_xtile_autoinc == true) << 7) | m_xtile_ptr; +} + + // R#1W - Pattern Name Table Access pointer X +WRITE8_MEMBER( ygv608_device::pattern_name_table_x_w ) +{ + m_xtile_ptr = data & 0x3f; + //if (xTile >= m_page_x) + // logerror ("%s:setting pnx(%d) >= page_x(%d)\n", machine().describe_context(), + // xTile, m_page_x ); + m_xtile_ptr &= m_page_x -1; + m_xtile_autoinc = BIT(data,7); +} + + // R#3R - sprite attribute table access pointer READ8_MEMBER( ygv608_device::sprite_address_r ) { @@ -2111,39 +2118,12 @@ void ygv608_device::SetPreShortcuts( int reg, int data ) // Set any "short-cut" variables after we have updated the YGV608 registers // - these are used only in optimisation of the emulation - +// TODO: actually this is legacy code that needs to go away void ygv608_device::SetPostShortcuts(int reg ) { switch (reg) { - case 0: - { - uint8_t yTile = m_regs.s.r0 & r0_pny; - - if (yTile >= m_page_y) - logerror ("%s:setting pny(%d) >= page_y(%d)\n", machine().describe_context(), - yTile, m_page_y ); - yTile &= (m_page_y - 1); - m_regs.s.r0 &= ~r0_pny; - m_regs.s.r0 |= yTile; - } - break; - - case 1: - { - uint8_t xTile = m_regs.s.r1 & r1_pnx; - - if (xTile >= m_page_x) - logerror ("%s:setting pnx(%d) >= page_x(%d)\n", machine().describe_context(), - xTile, m_page_x ); - xTile &= (m_page_x - 1); - m_regs.s.r1 &= ~r1_pnx; - m_regs.s.r1 |= xTile; - } - break; - - case 7: m_na8_mask = ((m_regs.s.r7 & r7_flip) ? 0x03 : 0x0f ); @@ -2218,7 +2198,7 @@ void ygv608_device::ShowYGV608Registers() "\tR#00: $%02X : PNYA(%d),B/A(%c),PNY(%d)\n", m_regs.b[0], m_regs.s.r0 & r0_pnya, - ((m_regs.s.r0 & r0_b_a) ? 'B' : 'A' ), + ((m_plane_select_access == true) ? 'B' : 'A' ), m_regs.s.r0 & r0_pny); logerror( |