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Switch to using the swizzled palette for playfield output.

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This commit is contained in:
Thomas Harte 2021-11-01 14:44:30 -07:00
parent 42145a5b8a
commit 2f1ce5fe43
2 changed files with 25 additions and 16 deletions
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39
Machines/Amiga/Chipset.cpp
View File

@ -236,10 +236,11 @@ template <int cycle> void Chipset::output() {
// palette table for that?
const uint32_t source = bitplane_pixels_.get(is_high_res_);
pixels_[0] = palette_[source >> 24];
pixels_[1] = palette_[(source >> 16) & 0xff];
pixels_[2] = palette_[(source >> 8) & 0xff];
pixels_[3] = palette_[source & 0xff];
// TODO: dump bit 5 if this Chipset doesn't support extra half-bright.
pixels_[0] = swizzled_palette_[source >> 24];
pixels_[1] = swizzled_palette_[(source >> 16) & 0xff];
pixels_[2] = swizzled_palette_[(source >> 8) & 0xff];
pixels_[3] = swizzled_palette_[source & 0xff];
for(int c = 3; c >= 0; --c) {
const auto data = sprite_shifters_[c].get();
@ -539,20 +540,26 @@ void Chipset::BitplaneShifter::set(const BitplaneData &previous, const BitplaneD
uint16_t(((previous[5] << 16) | next[5]) >> odd_delay),
};
// Swizzle bits into the form:
//
// [b5 b3 b1 b4 b2 b0]
//
// ... and assume a suitably adjusted palette is in use elsewhere.
// This makes dual playfields very easy to separate.
data_[0] =
(expand_bitplane_byte(uint8_t(planes[0])) << 0) |
(expand_bitplane_byte(uint8_t(planes[1])) << 1) |
(expand_bitplane_byte(uint8_t(planes[2])) << 2) |
(expand_bitplane_byte(uint8_t(planes[3])) << 3) |
(expand_bitplane_byte(uint8_t(planes[4])) << 4) |
(expand_bitplane_byte(uint8_t(planes[2])) << 1) |
(expand_bitplane_byte(uint8_t(planes[4])) << 2) |
(expand_bitplane_byte(uint8_t(planes[1])) << 3) |
(expand_bitplane_byte(uint8_t(planes[3])) << 4) |
(expand_bitplane_byte(uint8_t(planes[5])) << 5);
data_[1] =
(expand_bitplane_byte(uint8_t(planes[0] >> 8)) << 0) |
(expand_bitplane_byte(uint8_t(planes[1] >> 8)) << 1) |
(expand_bitplane_byte(uint8_t(planes[2] >> 8)) << 2) |
(expand_bitplane_byte(uint8_t(planes[3] >> 8)) << 3) |
(expand_bitplane_byte(uint8_t(planes[4] >> 8)) << 4) |
(expand_bitplane_byte(uint8_t(planes[2] >> 8)) << 1) |
(expand_bitplane_byte(uint8_t(planes[4] >> 8)) << 2) |
(expand_bitplane_byte(uint8_t(planes[1] >> 8)) << 3) |
(expand_bitplane_byte(uint8_t(planes[3] >> 8)) << 4) |
(expand_bitplane_byte(uint8_t(planes[5] >> 8)) << 5);
}
@ -880,9 +887,8 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
// Also store in bit-swizzled order. In this array,
// instead of being indexed as [b4 b3 b2 b1 b0], index
// as [b3 b1 b4 b2 b0]. This is related to the dual/single-playfield
// decision being made relatively late in the planar -> chunky
// conversion performed by this implementation.
// as [b3 b1 b4 b2 b0], and include a second set of the
// 32 colours, stored as half-bright.
const auto swizzled_address =
(entry_address&0x01) |
((entry_address&0x02) << 2) |
@ -892,6 +898,9 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
uint8_t *const swizzled_entry = reinterpret_cast<uint8_t *>(&swizzled_palette_[swizzled_address]);
swizzled_entry[0] = cycle.value8_high();
swizzled_entry[1] = cycle.value8_low();
swizzled_entry[64] = (swizzled_entry[0] >> 1) & 0x77;
swizzled_entry[65] = (swizzled_entry[1] >> 1) & 0x77;
} break;
}

2
Machines/Amiga/Chipset.hpp
View File

@ -307,7 +307,7 @@ class Chipset: private ClockingHint::Observer {
Outputs::CRT::CRT crt_;
uint16_t palette_[32]{};
uint16_t swizzled_palette_[32]{};
uint16_t swizzled_palette_[64]{};
// MARK: - Mouse.
private: