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falco500: Support graphics mode
This commit is contained in:
Dirk Best
parent
5342d0e7f5
commit
88050be1df
@ -301,7 +301,7 @@ void falco500_state::asic_mode_w(uint8_t data)
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// -------0 80/132 columns
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// timing wrong
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rectangle visarea(0, (BIT(data, 0) ? 132 * 10 : 80 * 10) - 1, 0, 400 - 1);
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rectangle visarea(0, (BIT(data, 0) ? 1320 : 1120) - 1, 0, 400 - 1);
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m_screen->configure(1500, 422, visarea, HZ_TO_ATTOSECONDS(60));
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}
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@ -340,20 +340,24 @@ uint32_t falco500_state::screen_update(screen_device &screen, bitmap_rgb32 &bitm
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// ----3210 offset for double-height lines
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// la2 layout
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// 7654---- line address bank (multiply by 2 to get the address)
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// 7------- line address highest bit (only for graphics mode?)
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// -654---- line address bank (multiply by 2 to get the address)
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// ----3210 line address offset high bytes
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// la3 layout
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// 7------- unknown
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// -6------ set on the line between windows
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// --5----- 80 columns/132 columns
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// ---43--- unknown
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// ---4---- graphics/alphanumeric
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// ----3--- unknown
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// -----2-- double width
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// ------1- double height first half
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// -------0 double height second half (but not working for line modes 26 and 44?)
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uint16_t line_addr = (la2 << 8) | la0;
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line_addr = ((line_addr & 0xf000) << 1) | (line_addr & 0x0fff);
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// move address highest bit to its place, shift bank left
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line_addr = bitswap<16>(line_addr, 14, 13, 12, 15, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
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//uint8_t unk_code = m_ram[0x0000 + line_addr]; // ?
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//uint8_t unk_attr = m_ram[0x1000 + line_addr]; // ?
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@ -364,92 +368,121 @@ uint32_t falco500_state::screen_update(screen_device &screen, bitmap_rgb32 &bitm
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uint8_t line_height = la1 >> 4;
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line_height++;
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// figure out number of columns
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int cols = BIT(la3, 5) ? 80 : 132;
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if (BIT(la3, 2))
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cols /= 2;
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// safety check to prevent writing out of bounds
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if (y + line_height > (cliprect.max_y + 1))
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return 0;
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for (int col = 0; col < cols; col++)
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if (BIT(la3, 4))
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{
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uint16_t char_addr = line_addr + col;
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uint8_t code = m_ram[0x0000 + char_addr];
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uint8_t attr = m_ram[0x1000 + char_addr];
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// code layout
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// 7------- unknown
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// -6543210 chargen address
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// attr layout
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// 7------- unknown
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// -6------ chargen address high bit
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// --5----- unknown
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// ---4---- normal/bold
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// ----3--- unknown
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// -----2-- reverse
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// ------1- blink
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// -------0 underline
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for (int y_char = 0; y_char < line_height; y_char++)
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// horizontal resolution 560 pixels
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for (int col = 0; col < 560; col++)
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{
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bool blink = bool(m_screen->frame_number() & 0x10); // timing?
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bool underline = bool(y_char == (m_asic_settings & 0x0f));
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int y_chargen = y_char;
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// double height enabled?
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if (la3 & 0x03)
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y_chargen /= 2;
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// double-height, first half
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if (BIT(la3, 1))
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y_chargen += 0;
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// double height, second half
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if (BIT(la3, 0))
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y_chargen += ((la1 & 0x0f) + 1);
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uint16_t gfx = m_charram[(BIT(attr, 6) << 12) | ((code & 0x7f) << 4) | y_chargen];
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if (BIT(attr, 0) && underline)
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gfx = 0x3ff;
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if (BIT(attr, 1) && blink)
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gfx = 0x000;
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if (BIT(attr, 2))
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gfx ^= 0x3ff;
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// cursor
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if (BIT(m_asic_settings, 4) && (m_asic_cursor_addr == char_addr))
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{
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if ((BIT(m_asic_settings, 5) == 1 && BIT(m_asic_settings, 6) == 0) || // block
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(BIT(m_asic_settings, 5) == 1 && BIT(m_asic_settings, 6) == 1 && blink) || // block-blink
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(BIT(m_asic_settings, 5) == 0 && underline && BIT(m_asic_settings, 6) == 0) || // underline
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(BIT(m_asic_settings, 5) == 0 && underline && BIT(m_asic_settings, 6) == 1 && blink)) // underline-blink
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gfx ^= 0x3ff; // might be solid instead
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}
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uint16_t char_addr = line_addr + col;
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uint8_t code = m_ram[0x0000 + char_addr];
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// foreground/background colors
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rgb_t fg = BIT(attr, 4) ? pen[1] : pen[2];
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rgb_t fg = pen[1];
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rgb_t bg = pen[0];
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for (int x = 0; x < 10; x++)
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for (int x = 0; x < 8; x++)
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{
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if (BIT(la3, 2))
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{
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// double-width
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bitmap.pix(y + y_char, col * 2 * 10 + x * 2 + 0) = BIT(gfx, x) ? fg : bg;
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bitmap.pix(y + y_char, col * 2 * 10 + x * 2 + 1) = BIT(gfx, x) ? fg : bg;
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bitmap.pix(y + (col / 70), (((col % 70) * 8) * 2) + (x * 2) + 0) = BIT(code, x) ? fg : bg;
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bitmap.pix(y + (col / 70), (((col % 70) * 8) * 2) + (x * 2) + 1) = BIT(code, x) ? fg : bg;
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}
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else
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{
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bitmap.pix(y + y_char, col * 10 + x) = BIT(gfx, x) ? fg : bg;
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bitmap.pix(y + (col / 70), ((col % 70) * 8) + x) = BIT(code, x) ? fg : bg;
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}
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}
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}
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}
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else
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{
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// figure out number of columns
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int cols = BIT(la3, 5) ? 80 : 132;
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if (BIT(la3, 2))
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cols /= 2;
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for (int col = 0; col < cols; col++)
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{
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uint16_t char_addr = line_addr + col;
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uint8_t code = m_ram[0x0000 + char_addr];
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uint8_t attr = m_ram[0x1000 + char_addr];
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// code layout
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// 7------- unknown
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// -6543210 chargen address
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// attr layout
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// 7------- unknown
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// -6------ chargen address high bit
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// --5----- unknown
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// ---4---- normal/bold
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// ----3--- unknown
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// -----2-- reverse
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// ------1- blink
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// -------0 underline
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for (int y_char = 0; y_char < line_height; y_char++)
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{
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bool blink = bool(m_screen->frame_number() & 0x10); // timing?
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bool underline = bool(y_char == (m_asic_settings & 0x0f));
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int y_chargen = y_char;
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// double height enabled?
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if (la3 & 0x03)
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y_chargen /= 2;
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// double-height, first half
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if (BIT(la3, 1))
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y_chargen += 0;
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// double height, second half
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if (BIT(la3, 0))
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y_chargen += ((la1 & 0x0f) + 1);
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uint16_t gfx = m_charram[(BIT(attr, 6) << 12) | ((code & 0x7f) << 4) | y_chargen];
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if (BIT(attr, 0) && underline)
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gfx = 0x3ff;
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if (BIT(attr, 1) && blink)
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gfx = 0x000;
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if (BIT(attr, 2))
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gfx ^= 0x3ff;
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// cursor
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if (BIT(m_asic_settings, 4) && (m_asic_cursor_addr == char_addr))
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{
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if ((BIT(m_asic_settings, 5) == 1 && BIT(m_asic_settings, 6) == 0) || // block
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(BIT(m_asic_settings, 5) == 1 && BIT(m_asic_settings, 6) == 1 && blink) || // block-blink
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(BIT(m_asic_settings, 5) == 0 && underline && BIT(m_asic_settings, 6) == 0) || // underline
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(BIT(m_asic_settings, 5) == 0 && underline && BIT(m_asic_settings, 6) == 1 && blink)) // underline-blink
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gfx ^= 0x3ff; // might be solid instead
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}
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// foreground/background colors
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rgb_t fg = BIT(attr, 4) ? pen[1] : pen[2];
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rgb_t bg = pen[0];
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for (int x = 0; x < 10; x++)
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{
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if (BIT(la3, 2))
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{
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// double-width
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bitmap.pix(y + y_char, col * 2 * 10 + x * 2 + 0) = BIT(gfx, x) ? fg : bg;
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bitmap.pix(y + y_char, col * 2 * 10 + x * 2 + 1) = BIT(gfx, x) ? fg : bg;
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}
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else
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{
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bitmap.pix(y + y_char, col * 10 + x) = BIT(gfx, x) ? fg : bg;
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}
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}
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}
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}
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