6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2026-04-21 17:16:44 +00:00
Code Issues Projects Releases Wiki Activity

Introduces a new scan source data type, motivated by the reasoning used by the Oric.

Browse Source 
Specifically: it'll allow PCM sampling of the potentially arbitrary composite generation logic of various machines.
This commit is contained in:
Thomas Harte
2018-11-28 20:40:22 -08:00
parent e39ecf59ef
commit fd579a019b
4 changed files with 42 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Machines/Oric/Video.cpp
+26 -12
View File
@@ -40,12 +40,12 @@ namespace {
VideoOutput::VideoOutput(uint8_t *memory) :
ram_(memory),
crt_(64*6, 1, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Red1Green1Blue1),
crt_(64*6, 1, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::PhaseLinkedLuminance8),
v_sync_start_position_(PAL50VSyncStartPosition), v_sync_end_position_(PAL50VSyncEndPosition),
counter_period_(PAL50Period) {
// crt_->set_composite_function_type(Outputs::CRT::CRT::CompositeSourceType::DiscreteFourSamplesPerCycle, 0.0f);
crt_.set_composite_function_type(Outputs::CRT::CRT::CompositeSourceType::DiscreteFourSamplesPerCycle, 1.0f / 8.0f);
set_display_type(Outputs::Display::DisplayType::RGB);
set_display_type(Outputs::Display::DisplayType::CompositeColour);
crt_.set_visible_area(crt_.get_rect_for_area(54, 224, 16 * 6, 40 * 6, 4.0f / 3.0f));
}
@@ -60,18 +60,32 @@ void VideoOutput::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
void VideoOutput::set_colour_rom(const std::vector<uint8_t> &rom) {
for(std::size_t c = 0; c < 8; c++) {
std::size_t index = (c << 2);
uint16_t rom_value = static_cast<uint16_t>((static_cast<uint16_t>(rom[index]) << 8) | static_cast<uint16_t>(rom[index+1]));
rom_value = (rom_value & 0xff00) | ((rom_value >> 4)&0x000f) | ((rom_value << 4)&0x00f0);
colour_forms_[c] = rom_value;
colour_forms_[c] = 0;
uint8_t *const colour = reinterpret_cast<uint8_t *>(&colour_forms_[c]);
const std::size_t index = (c << 2);
// Values in the ROM are encoded for indexing by two square waves
// in quadrature, which means that they're indexed in the order
// 0, 1, 3, 2.
colour[1] = uint8_t(rom[index] & 0xf0);
colour[0] = uint8_t((rom[index] & 0x0f) << 4);
colour[3] = uint8_t((rom[index+1] & 0x0f) << 4);
colour[2] = uint8_t(rom[index+1] & 0xf0);
// Extracting just the visible part of the stored range of values
// means etracting the range 0x40 to 0xe0.
for(int sub = 0; sub < 4; ++sub) {
colour[sub] = ((colour[sub] - 0x40) * 255) / 0xa0;
}
}
// check for big endianness and byte swap if required
uint16_t test_value = 0x0001;
// Check for big endianness and byte swap if required.
uint32_t test_value = 0x0001;
if(*reinterpret_cast<uint8_t *>(&test_value) != 0x01) {
for(std::size_t c = 0; c < 8; c++) {
colour_forms_[c] = static_cast<uint16_t>((colour_forms_[c] >> 8) | (colour_forms_[c] << 8));
}
// for(std::size_t c = 0; c < 8; c++) {
// colour_forms_[c] = static_cast<uint16_t>((colour_forms_[c] >> 8) | (colour_forms_[c] << 8));
// }
}
}