mirror of
https://github.com/TomHarte/CLK.git
synced 2025-01-27 06:35:04 +00:00
Put enough in place to get a visual representation of video memory.
Not the correct one, and so as to indicate that the machine isn't booting, surprisingly.
This commit is contained in:
Thomas Harte
parent
335c633884
commit
9bc470027e
@ -23,16 +23,45 @@ class ConcreteMachine:
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public CRTMachine::Machine,
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public CPU::MOS6502::BusHandler,
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public AppleII::Machine {
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public:
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private:
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struct VideoBusHandler : public AppleII::Video::BusHandler {
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public:
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VideoBusHandler(uint8_t *ram) : ram_(ram) {}
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uint8_t perform_read(uint16_t address) {
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return ram_[address];
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}
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private:
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uint8_t *ram_;
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};
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CPU::MOS6502::Processor<ConcreteMachine, false> m6502_;
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VideoBusHandler video_bus_handler_;
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std::unique_ptr<AppleII::Video::Video<VideoBusHandler>> video_;
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int cycles_into_current_line_ = 0;
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Cycles cycles_since_video_update_;
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void update_video() {
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video_->run_for(cycles_since_video_update_.flush());
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}
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uint8_t ram_[48*1024];
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std::vector<uint8_t> rom_;
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std::vector<uint8_t> character_rom_;
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uint16_t rom_start_address_;
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public:
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ConcreteMachine():
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m6502_(*this) {
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m6502_(*this),
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video_bus_handler_(ram_) {
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set_clock_rate(1022727);
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Memory::Fuzz(ram_, sizeof(ram_));
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}
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void setup_output(float aspect_ratio) override {
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video_.reset(new AppleII::Video);
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video_.reset(new AppleII::Video::Video<VideoBusHandler>(video_bus_handler_));
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video_->set_character_rom(character_rom_);
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}
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void close_output() override {
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@ -105,33 +134,22 @@ class ConcreteMachine:
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auto roms = roms_with_names(
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"AppleII",
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{
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"apple2o.rom"
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"apple2o.rom",
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"apple2o-character.rom"
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});
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if(!roms[0]) return false;
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if(!roms[0] || !roms[1]) return false;
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rom_ = std::move(*roms[0]);
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rom_start_address_ = static_cast<uint16_t>(0x10000 - rom_.size());
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character_rom_ = std::move(*roms[1]);
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return true;
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}
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void run_for(const Cycles cycles) override {
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m6502_.run_for(cycles);
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}
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private:
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CPU::MOS6502::Processor<ConcreteMachine, false> m6502_;
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std::unique_ptr<AppleII::Video> video_;
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int cycles_into_current_line_ = 0;
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Cycles cycles_since_video_update_;
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void update_video() {
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video_->run_for(cycles_since_video_update_.flush());
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}
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uint8_t ram_[48*1024];
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std::vector<uint8_t> rom_;
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uint16_t rom_start_address_;
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};
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}
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@ -8,132 +8,28 @@
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#include "Video.hpp"
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using namespace AppleII;
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using namespace AppleII::Video;
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Video::Video() :
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crt_(new Outputs::CRT::CRT(455, 1, Outputs::CRT::DisplayType::NTSC60, 1)) {
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// Set a composite sampling function that assumes 1bpp input, and uses just 7 bits per byte.
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crt_->set_composite_sampling_function(
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"float composite_sample(usampler2D sampler, vec2 coordinate, vec2 icoordinate, float phase, float amplitude)"
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"{"
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"uint texValue = texture(sampler, coordinate).r;"
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"texValue <<= int(icoordinate.x * 8) & 7;"
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"return float(texValue & 128u);"
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// "uint texValue = texture(sampler, coordinate).r;"
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// "texValue <<= uint(icoordinate.x * 7.0) % 7u;"
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// "return float(texValue & 128u);"
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"}");
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// Show only the centre 75% of the TV frame.
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crt_->set_video_signal(Outputs::CRT::VideoSignal::Composite);
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crt_->set_visible_area(Outputs::CRT::Rect(0.115f, 0.115f, 0.77f, 0.77f));
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}
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Outputs::CRT::CRT *Video::get_crt() {
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return crt_.get();
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}
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void Video::run_for(const Cycles cycles) {
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/*
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Addressing scheme used throughout is that column 0 is the first column with pixels in it;
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row 0 is the first row with pixels in it.
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A frame is oriented around 65 cycles across, 262 lines down.
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*/
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const int first_sync_line = 220; // A complete guess. Information needed.
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const int first_sync_column = 49; // Also a guess.
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int int_cycles = cycles.as_int();
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while(int_cycles) {
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const int cycles_this_line = std::min(65 - column_, int_cycles);
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if(row_ >= first_sync_line && row_ < first_sync_line + 3) {
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crt_->output_sync(static_cast<unsigned int>(cycles_this_line) * 7);
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} else {
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const int ending_column = column_ + cycles_this_line;
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// The first 40 columns are submitted to the CRT only upon completion;
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// they'll be either graphics or blank, depending on which side we are
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// of line 192.
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if(column_ < 40) {
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if(row_ < 192) {
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if(!column_) {
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pixel_pointer_ = crt_->allocate_write_area(40);
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}
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// TODO: actually store pixels.
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if(ending_column >= 40) {
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for(int c = 0; c < 40; ++c) {
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pixel_pointer_[c] = static_cast<uint8_t>((c * 6) ^ row_);
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}
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crt_->output_data(280, 7);
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}
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} else {
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if(ending_column >= 40) {
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crt_->output_blank(280);
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}
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}
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}
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/*
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The left border, sync, right border pattern doesn't depend on whether
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there were pixels this row and is output as soon as it is known.
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*/
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const int first_blank_start = std::max(40, column_);
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const int first_blank_end = std::min(first_sync_column, ending_column);
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if(first_blank_end > first_blank_start) {
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crt_->output_blank(static_cast<unsigned int>(first_blank_end - first_blank_start) * 7);
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}
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// TODO: colour burst.
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const int sync_start = std::max(first_sync_column, column_);
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const int sync_end = std::min(first_sync_column + 4, ending_column);
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if(sync_end > sync_start) {
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crt_->output_sync(static_cast<unsigned int>(sync_end - sync_start) * 7);
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}
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const int second_blank_start = std::max(first_sync_column + 4, column_);
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if(ending_column > second_blank_start) {
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crt_->output_blank(static_cast<unsigned int>(ending_column - second_blank_start) * 7);
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}
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}
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int_cycles -= cycles_this_line;
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column_ = (column_ + cycles_this_line) % 65;
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if(!column_) {
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row_ = (row_ + 1) % 262;
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// Add an extra half a colour cycle of blank; this isn't counted in the run_for
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// count explicitly but is promised.
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crt_->output_blank(1);
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}
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}
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}
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void Video::set_graphics_mode() {
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printf("Graphics mode\n");
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}
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void Video::set_text_mode() {
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printf("Text mode\n");
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}
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void Video::set_mixed_mode(bool mixed_mode) {
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printf("Mixed mode: %s\n", mixed_mode ? "true" : "false");
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}
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void Video::set_video_page(int page) {
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printf("Video page: %d\n", page);
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}
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void Video::set_low_resolution() {
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printf("Low resolution\n");
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}
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void Video::set_high_resolution() {
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printf("High resolution\n");
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}
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//void Video::set_graphics_mode() {
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// printf("Graphics mode\n");
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//}
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//
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//void Video::set_text_mode() {
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// printf("Text mode\n");
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//}
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//
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//void Video::set_mixed_mode(bool mixed_mode) {
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// printf("Mixed mode: %s\n", mixed_mode ? "true" : "false");
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//}
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//
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//void Video::set_video_page(int page) {
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// printf("Video page: %d\n", page);
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//}
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//
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//void Video::set_low_resolution() {
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// printf("Low resolution\n");
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//}
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//
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//void Video::set_high_resolution() {
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// printf("High resolution\n");
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//}
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6
ROMImages/AppleII/readme.txt
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6
ROMImages/AppleII/readme.txt
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@ -0,0 +1,6 @@
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ROM files would ordinarily go here; they are copyright Apple so are not included.
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Expected files:
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apple2o.rom — a 12kb image of the original Apple II's ROMs.
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apple2o-character.rom — a 2kb image of the original Apple II's character ROM.
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