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Merge pull request #885 from TomHarte/MasterSystemBlue

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Tweak Master System blue scale.
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Thomas Harte 2021-03-19 08:48:47 -04:00 committed by GitHub
commit 60a0f8e824
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1 changed files with 7 additions and 4 deletions
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11
Components/9918/Implementation/9918Base.hpp
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@ -350,11 +350,14 @@ class Base {
case MemoryAccess::Write:
if(master_system_.cram_is_selected) {
// Adjust the palette.
// Adjust the palette. In a Master System blue has a slightly different
// scale; cf. https://www.retrorgb.com/sega-master-system-non-linear-blue-channel-findings.html
constexpr uint8_t rg_scale[] = {0, 85, 170, 255};
constexpr uint8_t b_scale[] = {0, 104, 170, 255};
master_system_.colour_ram[ram_pointer_ & 0x1f] = palette_pack(
uint8_t(((read_ahead_buffer_ >> 0) & 3) * 255 / 3),
uint8_t(((read_ahead_buffer_ >> 2) & 3) * 255 / 3),
uint8_t(((read_ahead_buffer_ >> 4) & 3) * 255 / 3)
rg_scale[(read_ahead_buffer_ >> 0) & 3],
rg_scale[(read_ahead_buffer_ >> 2) & 3],
b_scale[(read_ahead_buffer_ >> 4) & 3]
);
// Schedule a CRAM dot; this is scheduled for wherever it should appear