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Endeavour to map colours properly.

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This commit is contained in:
Thomas Harte 2024-03-21 21:53:50 -04:00
parent aa6acec8fa
commit 4a2dcff028
1 changed files with 17 additions and 7 deletions
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24
Machines/Acorn/Archimedes/Video.hpp
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@ -12,6 +12,7 @@
#include "../../../Outputs/CRT/CRT.hpp"
#include <cstdint>
#include <cstring>
namespace Archimedes {
@ -31,8 +32,13 @@ struct Video {
return (value >> 14) & 0x3ff;
};
const auto colour = [](uint32_t value) -> uint16_t {
// TODO: convert to internal format.
return static_cast<uint16_t>(value & 0x1fff);
uint8_t packed[2];
packed[0] = value & 0xf;
packed[1] = (value & 0xf0) | ((value & 0xf00) >> 8);
uint16_t result;
memcpy(&result, packed, 2);
return result;
};
switch(target) {
@ -122,6 +128,7 @@ struct Video {
if(vertical_state_.position == vertical_timing_.period) {
vertical_state_.position = 0;
address_ = frame_start_;
}
}
@ -202,11 +209,14 @@ private:
Phase phase_ = Phase::Sync;
uint32_t time_in_phase_ = 0;
// Addresses.
uint32_t buffer_start_;
uint32_t buffer_end_;
uint32_t frame_start_;
uint32_t cursor_start_;
// Programmer-set addresses.
uint32_t buffer_start_ = 0;
uint32_t buffer_end_ = 0;
uint32_t frame_start_ = 0;
uint32_t cursor_start_ = 0;
// Ephemeral address state.
uint32_t address_ = 0;
// Horizontal and vertical timing.
struct Timing {