diff options
Diffstat (limited to 'src/mame/video/gyruss.cpp')
-rw-r--r-- | src/mame/video/gyruss.cpp | 60 |
1 files changed, 29 insertions, 31 deletions
diff --git a/src/mame/video/gyruss.cpp b/src/mame/video/gyruss.cpp index d20ff38ef5a..61ddfee37b2 100644 --- a/src/mame/video/gyruss.cpp +++ b/src/mame/video/gyruss.cpp @@ -31,61 +31,59 @@ ***************************************************************************/ -PALETTE_INIT_MEMBER(gyruss_state, gyruss) +void gyruss_state::gyruss_palette(palette_device &palette) const { const uint8_t *color_prom = memregion("proms")->base(); - static const int resistances_rg[3] = { 1000, 470, 220 }; - static const int resistances_b [2] = { 470, 220 }; - double weights_rg[3], weights_b[2]; - int i; + static constexpr int resistances_rg[3] = { 1000, 470, 220 }; + static constexpr int resistances_b [2] = { 470, 220 }; - /* compute the color output resistor weights */ + // compute the color output resistor weights + double weights_rg[3], weights_b[2]; compute_resistor_weights(0, 255, -1.0, 3, resistances_rg, weights_rg, 470, 0, 2, resistances_b, weights_b, 470, 0, 0, nullptr, nullptr, 0, 0); - /* create a lookup table for the palette */ - for (i = 0; i < 0x20; i++) + // create a lookup table for the palette + for (int i = 0; i < 0x20; i++) { int bit0, bit1, bit2; - int r, g, b; - /* red component */ - bit0 = (color_prom[i] >> 0) & 0x01; - bit1 = (color_prom[i] >> 1) & 0x01; - bit2 = (color_prom[i] >> 2) & 0x01; - r = combine_3_weights(weights_rg, bit0, bit1, bit2); + // red component + bit0 = BIT(color_prom[i], 0); + bit1 = BIT(color_prom[i], 1); + bit2 = BIT(color_prom[i], 2); + int const r = combine_3_weights(weights_rg, bit0, bit1, bit2); - /* green component */ - bit0 = (color_prom[i] >> 3) & 0x01; - bit1 = (color_prom[i] >> 4) & 0x01; - bit2 = (color_prom[i] >> 5) & 0x01; - g = combine_3_weights(weights_rg, bit0, bit1, bit2); + // green component + bit0 = BIT(color_prom[i], 3); + bit1 = BIT(color_prom[i], 4); + bit2 = BIT(color_prom[i], 5); + int const g = combine_3_weights(weights_rg, bit0, bit1, bit2); - /* blue component */ - bit0 = (color_prom[i] >> 6) & 0x01; - bit1 = (color_prom[i] >> 7) & 0x01; - b = combine_2_weights(weights_b, bit0, bit1); + // blue component + bit0 = BIT(color_prom[i], 6); + bit1 = BIT(color_prom[i], 7); + int const b = combine_2_weights(weights_b, bit0, bit1); palette.set_indirect_color(i, rgb_t(r, g, b)); } - /* color_prom now points to the beginning of the lookup table */ + // color_prom now points to the beginning of the lookup table color_prom += 32; - /* sprites map to the lower 16 palette entries */ - for (i = 0; i < 0x100; i++) + // sprites map to the lower 16 palette entries + for (int i = 0; i < 0x100; i++) { - uint8_t ctabentry = color_prom[i] & 0x0f; + uint8_t const ctabentry = color_prom[i] & 0x0f; palette.set_pen_indirect(i, ctabentry); } - /* characters map to the upper 16 palette entries */ - for (i = 0x100; i < 0x140; i++) + // characters map to the upper 16 palette entries + for (int i = 0x100; i < 0x140; i++) { - uint8_t ctabentry = color_prom[i] & 0x0f; - palette.set_pen_indirect(i, ctabentry + 0x10); + uint8_t const ctabentry = color_prom[i] & 0x0f; + palette.set_pen_indirect(i, ctabentry | 0x10); } } |