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Switches bitplane shifter to returning four high-res pixels at a time.

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This commit is contained in:
Thomas Harte 2021-10-25 13:34:36 -07:00
parent 7118a515e0
commit c6535bf035
3 changed files with 30 additions and 27 deletions
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33
Machines/Amiga/Chipset.cpp
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@ -181,26 +181,13 @@ template <int cycle> void Chipset::output() {
if(pixels_) {
// TODO: this doesn't support dual playfields; use an alternative
// palette table for that.
const uint32_t source = bitplane_pixels_.get(is_high_res_);
bitplane_pixels_.shift(is_high_res_);
if(is_high_res_) {
pixels_[0] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
pixels_[1] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
pixels_[2] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
pixels_[3] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
} else {
pixels_[0] = pixels_[1] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
pixels_[2] = pixels_[3] = palette_[bitplane_pixels_.get()];
bitplane_pixels_.shift();
}
pixels_[0] = palette_[source >> 24];
pixels_[1] = palette_[(source >> 16) & 0xff];
pixels_[2] = palette_[(source >> 8) & 0xff];
pixels_[3] = palette_[source & 0xff];
// QUICK HACK: dump sprite pixels:
//
@ -1378,7 +1365,13 @@ int Chipset::Mouse::get_number_of_buttons() {
}
void Chipset::Mouse::set_button_pressed(int button, bool is_set) {
const uint8_t mask = 0x80 >> button;
// TODO: this is nothing like correct; the second and optional
// third buttons aren't exposed via CIA A like the first is,
// so there's not really a single location of buttons.
//
// Leaving as is for now, as this gives me a working left
// button in port 0 and that'll do.
const auto mask = uint8_t(0x40 << button);
button_state =
(button_state & ~mask) |
(is_set ? 0 : mask);

19
Machines/Amiga/Chipset.hpp
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@ -226,13 +226,22 @@ class Chipset: private ClockingHint::Observer {
int odd_delay,
int even_delay);
void shift() {
(*this)[1] = ((*this)[1] << 8) | ((*this)[0] >> 56);
(*this)[0] <<= 8;
void shift(bool high_res) {
constexpr int shifts[] = {16, 32};
(*this)[1] = ((*this)[1] << shifts[high_res]) | ((*this)[0] >> (64 - shifts[high_res]));
(*this)[0] <<= shifts[high_res];
}
uint8_t get() {
return uint8_t((*this)[1] >> 56);
uint32_t get(bool high_res) {
if(high_res) {
return uint32_t((*this)[1] >> 32);
} else {
uint32_t result = uint16_t((*this)[1] >> 48);
result = ((result & 0xff00) << 8) | (result & 0x00ff);
result |= result << 8;
return result;
}
}
} bitplane_pixels_;

5
Machines/Amiga/Copper.cpp
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@ -6,9 +6,10 @@
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#include <stdio.h>
#ifndef NDEBUG
#define NDEBUG
#endif
#define LOG_PREFIX "[Copper] "
#include "../../Outputs/Log.hpp"