diff options
Diffstat (limited to 'src/mame/video/lucky74.cpp')
-rw-r--r-- | src/mame/video/lucky74.cpp | 112 |
1 files changed, 54 insertions, 58 deletions
diff --git a/src/mame/video/lucky74.cpp b/src/mame/video/lucky74.cpp index 309c71df8ef..b295311e6c2 100644 --- a/src/mame/video/lucky74.cpp +++ b/src/mame/video/lucky74.cpp @@ -125,74 +125,70 @@ WRITE8_MEMBER(lucky74_state::lucky74_bg_colorram_w) } -PALETTE_INIT_MEMBER(lucky74_state, lucky74) -/* - There are 2 states (see the technical notes). - We're constructing a double-sized palette with one half for each state. -*/ +void lucky74_state::lucky74_palette(palette_device &palette) const { - const uint8_t *color_prom = memregion("proms")->base(); - int i; - static const int resistances_rgb[4] = { 2000, 1000, 470, 220 }; - double weights_r[4], weights_g[4], weights_b[4]; + // There are 2 states (see the technical notes). + // We're constructing a double-sized palette with one half for each state. + uint8_t const *const color_prom = memregion("proms")->base(); + static constexpr int resistances_rgb[4] = { 2000, 1000, 470, 220 }; + double weights_r[4], weights_g[4], weights_b[4]; compute_resistor_weights(0, 255, -1.0, 4, resistances_rgb, weights_r, 1000, 0, 4, resistances_rgb, weights_g, 1000, 0, 4, resistances_rgb, weights_b, 1000, 0); - - for (i = 0; i < 256; i++) + for (int i = 0; i < 256; i++) { - int bit0, bit1, bit2, bit3, r1, g1, b1, r2, g2, b2; - - /* red component (this 1, PROM E6) */ - bit0 = (color_prom[0x000 + i] >> 0) & 0x01; - bit1 = (color_prom[0x000 + i] >> 1) & 0x01; - bit2 = (color_prom[0x000 + i] >> 2) & 0x01; - bit3 = (color_prom[0x000 + i] >> 3) & 0x01; - r1 = combine_4_weights(weights_r, bit0, bit1, bit2, bit3); - - /* red component (this 2, PROM E7) */ - bit0 = (color_prom[0x100 + i] >> 0) & 0x01; - bit1 = (color_prom[0x100 + i] >> 1) & 0x01; - bit2 = (color_prom[0x100 + i] >> 2) & 0x01; - bit3 = (color_prom[0x100 + i] >> 3) & 0x01; - r2 = combine_4_weights(weights_r, bit0, bit1, bit2, bit3); - - /* green component (this 1, PROM D6) */ - bit0 = (color_prom[0x200 + i] >> 0) & 0x01; - bit1 = (color_prom[0x200 + i] >> 1) & 0x01; - bit2 = (color_prom[0x200 + i] >> 2) & 0x01; - bit3 = (color_prom[0x200 + i] >> 3) & 0x01; - g1 = combine_4_weights(weights_g, bit0, bit1, bit2, bit3); - - /* green component (this 2, PROM D7) */ - bit0 = (color_prom[0x300 + i] >> 0) & 0x01; - bit1 = (color_prom[0x300 + i] >> 1) & 0x01; - bit2 = (color_prom[0x300 + i] >> 2) & 0x01; - bit3 = (color_prom[0x300 + i] >> 3) & 0x01; - g2 = combine_4_weights(weights_g, bit0, bit1, bit2, bit3); - - /* blue component (this 1, PROM C6) */ - bit0 = (color_prom[0x400 + i] >> 0) & 0x01; - bit1 = (color_prom[0x400 + i] >> 1) & 0x01; - bit2 = (color_prom[0x400 + i] >> 2) & 0x01; - bit3 = (color_prom[0x400 + i] >> 3) & 0x01; - b1 = combine_4_weights(weights_b, bit0, bit1, bit2, bit3); - - /* blue component (this 2, PROM C7) */ - bit0 = (color_prom[0x500 + i] >> 0) & 0x01; - bit1 = (color_prom[0x500 + i] >> 1) & 0x01; - bit2 = (color_prom[0x500 + i] >> 2) & 0x01; - bit3 = (color_prom[0x500 + i] >> 3) & 0x01; - b2 = combine_4_weights(weights_b, bit0, bit1, bit2, bit3); - - - /* PROMs circuitry, 1st state */ + int bit0, bit1, bit2, bit3; + + // red component (this 1, PROM E6) + bit0 = BIT(color_prom[0x000 + i], 0); + bit1 = BIT(color_prom[0x000 + i], 1); + bit2 = BIT(color_prom[0x000 + i], 2); + bit3 = BIT(color_prom[0x000 + i], 3); + int const r1 = combine_4_weights(weights_r, bit0, bit1, bit2, bit3); + + // red component (this 2, PROM E7) + bit0 = BIT(color_prom[0x100 + i], 0); + bit1 = BIT(color_prom[0x100 + i], 1); + bit2 = BIT(color_prom[0x100 + i], 2); + bit3 = BIT(color_prom[0x100 + i], 3); + int const r2 = combine_4_weights(weights_r, bit0, bit1, bit2, bit3); + + // green component (this 1, PROM D6) + bit0 = BIT(color_prom[0x200 + i], 0); + bit1 = BIT(color_prom[0x200 + i], 1); + bit2 = BIT(color_prom[0x200 + i], 2); + bit3 = BIT(color_prom[0x200 + i], 3); + int const g1 = combine_4_weights(weights_g, bit0, bit1, bit2, bit3); + + // green component (this 2, PROM D7) + bit0 = BIT(color_prom[0x300 + i], 0); + bit1 = BIT(color_prom[0x300 + i], 1); + bit2 = BIT(color_prom[0x300 + i], 2); + bit3 = BIT(color_prom[0x300 + i], 3); + int const g2 = combine_4_weights(weights_g, bit0, bit1, bit2, bit3); + + // blue component (this 1, PROM C6) + bit0 = BIT(color_prom[0x400 + i], 0); + bit1 = BIT(color_prom[0x400 + i], 1); + bit2 = BIT(color_prom[0x400 + i], 2); + bit3 = BIT(color_prom[0x400 + i], 3); + int const b1 = combine_4_weights(weights_b, bit0, bit1, bit2, bit3); + + // blue component (this 2, PROM C7) + bit0 = BIT(color_prom[0x500 + i], 0); + bit1 = BIT(color_prom[0x500 + i], 1); + bit2 = BIT(color_prom[0x500 + i], 2); + bit3 = BIT(color_prom[0x500 + i], 3); + int const b2 = combine_4_weights(weights_b, bit0, bit1, bit2, bit3); + + + // PROMs circuitry, 1st state palette.set_pen_color(i, rgb_t(r1, g1, b1)); - /* PROMs circuitry, 2nd state */ + // PROMs circuitry, 2nd state palette.set_pen_color(i + 256, rgb_t(r2, g2, b2)); } } |