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Adds enough text mode for now.

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Discovered: a memory fault is being reported at startup.
This commit is contained in:
Thomas Harte 2021-06-16 21:42:20 -04:00
parent 7161783a4f
commit 4414e96710
2 changed files with 66 additions and 10 deletions
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75
Machines/Enterprise/Nick.cpp
View File

@ -124,9 +124,9 @@ void Nick::run_for(HalfCycles duration) {
switch(mode_) {
default:
case Mode::Pixel: column_size_ = 16 / bpp_; break;
// case Mode::CH64:
// case Mode::CH128:
// case Mode::CH256:
case Mode::CH64:
case Mode::CH128:
case Mode::CH256:
case Mode::LPixel: column_size_ = 8 / bpp_; break;
// case Mode::Attr: column_size_ = 8; break;
}
@ -214,6 +214,9 @@ void Nick::run_for(HalfCycles duration) {
#define pixel(x) output_pixel<x, false>
#define lpixel(x) output_pixel<x, true>
#define ch256(x) output_character<x, 8>
#define ch128(x) output_character<x, 7>
#define ch64(x) output_character<x, 6>
int columns_remaining = next_event - window;
while(columns_remaining) {
@ -229,6 +232,9 @@ void Nick::run_for(HalfCycles duration) {
default:
case Mode::Pixel: DispatchBpp(pixel); break;
case Mode::LPixel: DispatchBpp(lpixel); break;
case Mode::CH256: DispatchBpp(ch256); break;
case Mode::CH128: DispatchBpp(ch128); break;
case Mode::CH64: DispatchBpp(ch64); break;
}
pixel_pointer_ += output_duration * column_size_;
@ -245,7 +251,11 @@ void Nick::run_for(HalfCycles duration) {
pixel_duration_ += columns_remaining;
columns_remaining = 0;
}
}
#undef ch64
#undef ch128
#undef ch256
#undef pixel
#undef lpixel
#undef DispatchBpp
@ -285,7 +295,16 @@ void Nick::run_for(HalfCycles duration) {
}
}
// TODO: should reload line data pointers?
// TODO: logic below is very incomplete.
switch(mode_) {
default: break;
case Mode::CH64:
case Mode::CH128:
case Mode::CH256:
line_data_pointer_[0] = uint16_t(line_parameters_[4] | (line_parameters_[5] << 8));
++line_data_pointer_[1];
break;
}
}
}
}
@ -320,9 +339,11 @@ Outputs::Display::ScanStatus Nick::get_scaled_scan_status() const {
// MARK: - Specific pixel outputters.
template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int columns) {
static_assert(bpp == 1 || bpp == 2 || bpp == 4 || bpp == 8);
for(int c = 0; c < columns; c++) {
const uint8_t pixels[2] = { ram_[line_data_pointer_[0]], ram_[line_data_pointer_[0]+1] };
line_data_pointer_[0] += 2;
const uint8_t pixels[2] = { ram_[line_data_pointer_[0]], ram_[(line_data_pointer_[0]+1) & 0xffff] };
line_data_pointer_[0] += is_lpixel ? 1 : 2;
switch(bpp) {
default:
@ -336,7 +357,7 @@ template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int
target[6] = palette_[(pixels[0] & 0x02) >> 1];
target[7] = palette_[(pixels[0] & 0x01) >> 0];
if(!is_lpixel) {
if constexpr (!is_lpixel) {
target[8] = palette_[(pixels[1] & 0x80) >> 7];
target[9] = palette_[(pixels[1] & 0x40) >> 6];
target[10] = palette_[(pixels[1] & 0x20) >> 5];
@ -358,7 +379,7 @@ template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int
target[2] = palette_[((pixels[0] & 0x20) >> 4) | ((pixels[0] & 0x02) >> 1)];
target[3] = palette_[((pixels[0] & 0x10) >> 3) | ((pixels[0] & 0x01) >> 0)];
if(!is_lpixel) {
if constexpr (!is_lpixel) {
target[4] = palette_[((pixels[1] & 0x80) >> 6) | ((pixels[1] & 0x08) >> 3)];
target[5] = palette_[((pixels[1] & 0x40) >> 5) | ((pixels[1] & 0x04) >> 2)];
target[6] = palette_[((pixels[1] & 0x20) >> 4) | ((pixels[1] & 0x02) >> 1)];
@ -374,7 +395,7 @@ template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int
target[0] = palette_[((pixels[0] & 0x80) >> 4) | ((pixels[0] & 0x20) >> 3) | ((pixels[0] & 0x08) >> 2) | ((pixels[0] & 0x02) >> 1)];
target[1] = palette_[((pixels[0] & 0x40) >> 3) | ((pixels[0] & 0x10) >> 2) | ((pixels[0] & 0x04) >> 1) | ((pixels[0] & 0x01) >> 0)];
if(!is_lpixel) {
if constexpr (!is_lpixel) {
target[2] = palette_[((pixels[1] & 0x80) >> 4) | ((pixels[1] & 0x20) >> 3) | ((pixels[1] & 0x08) >> 2) | ((pixels[1] & 0x02) >> 1)];
target[3] = palette_[((pixels[1] & 0x40) >> 3) | ((pixels[1] & 0x10) >> 2) | ((pixels[1] & 0x04) >> 1) | ((pixels[1] & 0x01) >> 0)];
@ -387,7 +408,7 @@ template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int
case 8:
target[0] = mapped_colour(pixels[0]);
if(!is_lpixel) {
if constexpr (!is_lpixel) {
target[1] = mapped_colour(pixels[1]);
++target;
@ -398,3 +419,37 @@ template <int bpp, bool is_lpixel> void Nick::output_pixel(uint16_t *target, int
}
}
template <int bpp, int index_bits> void Nick::output_character(uint16_t *target, int columns) {
static_assert(bpp == 1 || bpp == 2 || bpp == 4 || bpp == 8);
for(int c = 0; c < columns; c++) {
const uint8_t character = ram_[line_data_pointer_[0]];
++line_data_pointer_[0];
const uint8_t pixels = ram_[
(line_data_pointer_[1] << index_bits) +
(character & ((1 << index_bits) - 1))
];
// TODO: below looks repetitious of the above, but I've yet to factor in
// ALTINDs and [M/L]SBALTs, so I'll correct for factoring when I've done that.
switch(bpp) {
default:
assert(false);
break;
case 1:
target[0] = palette_[(pixels & 0x80) >> 7];
target[1] = palette_[(pixels & 0x40) >> 6];
target[2] = palette_[(pixels & 0x20) >> 5];
target[3] = palette_[(pixels & 0x10) >> 4];
target[4] = palette_[(pixels & 0x08) >> 3];
target[5] = palette_[(pixels & 0x04) >> 2];
target[6] = palette_[(pixels & 0x02) >> 1];
target[7] = palette_[(pixels & 0x01) >> 0];
target += 8;
break;
}
}
}

1
Machines/Enterprise/Nick.hpp
View File

@ -81,6 +81,7 @@ class Nick {
// Specific outputters.
template <int bpp, bool is_lpixel> void output_pixel(uint16_t *target, int columns);
template <int bpp, int index_bits> void output_character(uint16_t *target, int columns);
};