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1127 lines
38 KiB
C++
1127 lines
38 KiB
C++
//
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// 9918.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 25/11/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#include "../9918.hpp"
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#include <cassert>
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#include <cstring>
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#include <cstdlib>
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#include "../../../Outputs/Log.hpp"
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using namespace TI::TMS;
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namespace {
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// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
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// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
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constexpr unsigned int CRTCyclesPerLine = 1365;
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constexpr unsigned int CRTCyclesDivider = 4;
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}
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template <Personality personality>
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Base<personality>::Base() :
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crt_(CRTCyclesPerLine, CRTCyclesDivider, Outputs::Display::Type::NTSC60, Outputs::Display::InputDataType::Red8Green8Blue8) {
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// Unimaginatively, this class just passes RGB through to the shader. Investigation is needed
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// into whether there's a more natural form. It feels unlikely given the diversity of chips modelled.
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if constexpr (is_sega_vdp(personality)) {
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mode_timing_.line_interrupt_position = 64;
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mode_timing_.end_of_frame_interrupt_position.column = 63;
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mode_timing_.end_of_frame_interrupt_position.row = 193;
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}
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// Establish that output is delayed after reading by `output_lag` cycles; start
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// at a random position.
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fetch_pointer_.row = rand() % 262;
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fetch_pointer_.column = rand() % (Timing<personality>::CyclesPerLine - output_lag);
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output_pointer_.row = output_pointer_.row;
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output_pointer_.column = output_pointer_.column + output_lag;
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}
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template <Personality personality>
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TMS9918<personality>::TMS9918() {
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this->crt_.set_display_type(Outputs::Display::DisplayType::RGB);
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this->crt_.set_visible_area(Outputs::Display::Rect(0.07f, 0.0375f, 0.875f, 0.875f));
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// The TMS remains in-phase with the NTSC colour clock; this is an empirical measurement
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// intended to produce the correct relationship between the hard edges between pixels and
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// the colour clock. It was eyeballed rather than derived from any knowledge of the TMS
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// colour burst generator because I've yet to find any.
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this->crt_.set_immediate_default_phase(0.85f);
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}
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template <Personality personality>
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void TMS9918<personality>::set_tv_standard(TVStandard standard) {
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this->tv_standard_ = standard;
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switch(standard) {
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case TVStandard::PAL:
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this->mode_timing_.total_lines = 313;
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this->mode_timing_.first_vsync_line = 253;
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this->crt_.set_new_display_type(CRTCyclesPerLine, Outputs::Display::Type::PAL50);
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break;
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default:
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this->mode_timing_.total_lines = 262;
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this->mode_timing_.first_vsync_line = 227;
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this->crt_.set_new_display_type(CRTCyclesPerLine, Outputs::Display::Type::NTSC60);
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break;
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}
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}
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template <Personality personality>
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void TMS9918<personality>::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
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this->crt_.set_scan_target(scan_target);
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}
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template <Personality personality>
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Outputs::Display::ScanStatus TMS9918<personality>::get_scaled_scan_status() const {
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// The input was scaled by 3/4 to convert half cycles to internal ticks,
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// so undo that and also allow for: (i) the multiply by 4 that it takes
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// to reach the CRT; and (ii) the fact that the half-cycles value was scaled,
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// and this should really reply in whole cycles.
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return this->crt_.get_scaled_scan_status() * (4.0f / (3.0f * 8.0f));
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}
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template <Personality personality>
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void TMS9918<personality>::set_display_type(Outputs::Display::DisplayType display_type) {
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this->crt_.set_display_type(display_type);
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}
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template <Personality personality>
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Outputs::Display::DisplayType TMS9918<personality>::get_display_type() const {
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return this->crt_.get_display_type();
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}
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void LineBuffer::reset_sprite_collection() {
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sprites_stopped = false;
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active_sprite_slot = 0;
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for(int c = 0; c < 8; ++c) {
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active_sprites[c].shift_position = 0;
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}
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}
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template <Personality personality>
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void Base<personality>::posit_sprite(LineBuffer &buffer, int sprite_number, int sprite_position, int screen_row) {
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if(!(status_ & StatusSpriteOverflow)) {
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status_ = uint8_t((status_ & ~0x1f) | (sprite_number & 0x1f));
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}
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if(buffer.sprites_stopped) return;
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// A sprite Y of 208 means "don't scan the list any further".
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if(mode_timing_.allow_sprite_terminator && sprite_position == mode_timing_.sprite_terminator) {
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buffer.sprites_stopped = true;
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return;
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}
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const int sprite_row = (((screen_row + 1) % mode_timing_.total_lines) - ((sprite_position + 1) & 255)) & 255;
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if(sprite_row < 0 || sprite_row >= sprite_height_) return;
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if(buffer.active_sprite_slot == mode_timing_.maximum_visible_sprites) {
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status_ |= StatusSpriteOverflow;
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return;
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}
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LineBuffer::ActiveSprite &sprite = buffer.active_sprites[buffer.active_sprite_slot];
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sprite.index = sprite_number;
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sprite.row = sprite_row >> (sprites_magnified_ ? 1 : 0);
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++buffer.active_sprite_slot;
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}
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template <Personality personality>
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void TMS9918<personality>::run_for(const HalfCycles cycles) {
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// As specific as I've been able to get:
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// Scanline time is always 228 cycles.
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// PAL output is 313 lines total. NTSC output is 262 lines total.
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// Interrupt is signalled upon entering the lower border.
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// Convert 456 clocked half cycles per line to 342 internal cycles per line;
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// the internal clock is 1.5 times the nominal 3.579545 Mhz that I've advertised
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// for this part. So multiply by three quarters.
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const int int_cycles = this->clock_converter_.to_internal(cycles.as<int>());
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if(!int_cycles) return;
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// There are two intertwined processes here, 'writing' (which means writing to the
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// line buffers, i.e. it's everything to do with collecting a line) and 'reading'
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// (which means reading from the line buffers and generating video).
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int write_cycles_pool = int_cycles;
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int read_cycles_pool = int_cycles;
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while(write_cycles_pool || read_cycles_pool) {
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#ifndef NDEBUG
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LineBufferPointer backup = this->output_pointer_;
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#endif
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if(write_cycles_pool) {
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// Determine how much writing to do.
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const int write_cycles = std::min(
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Timing<personality>::CyclesPerLine - this->fetch_pointer_.column,
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write_cycles_pool
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);
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const int end_column = this->fetch_pointer_.column + write_cycles;
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LineBuffer &line_buffer = this->line_buffers_[this->fetch_pointer_.row];
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// Determine what this does to any enqueued VRAM access.
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this->minimum_access_column_ = this->fetch_pointer_.column + this->cycles_until_access_;
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this->cycles_until_access_ -= write_cycles;
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// ---------------------------------------
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// Latch scrolling position, if necessary.
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// ---------------------------------------
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if constexpr (is_sega_vdp(personality)) {
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if(this->fetch_pointer_.column < 61 && end_column >= 61) {
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if(!this->fetch_pointer_.row) {
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Storage<personality>::latched_vertical_scroll_ = Storage<personality>::vertical_scroll_;
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if(Storage<personality>::mode4_enable_) {
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this->mode_timing_.pixel_lines = 192;
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if(this->mode2_enable_ && this->mode1_enable_) this->mode_timing_.pixel_lines = 224;
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if(this->mode2_enable_ && this->mode3_enable_) this->mode_timing_.pixel_lines = 240;
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this->mode_timing_.allow_sprite_terminator = this->mode_timing_.pixel_lines == 192;
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this->mode_timing_.first_vsync_line = (this->mode_timing_.total_lines + this->mode_timing_.pixel_lines) >> 1;
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this->mode_timing_.end_of_frame_interrupt_position.row = this->mode_timing_.pixel_lines + 1;
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}
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}
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line_buffer.latched_horizontal_scroll = Storage<personality>::horizontal_scroll_;
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}
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}
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// ------------------------
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// Perform memory accesses.
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// ------------------------
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#define fetch(function, clock) \
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const int first_window = from_internal<personality, clock>(this->fetch_pointer_.column);\
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const int final_window = from_internal<personality, clock>(end_column); \
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if(first_window == final_window) break; \
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if(final_window != clock_rate<personality, clock>()) { \
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function<true>(first_window, final_window); \
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} else { \
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function<false>(first_window, final_window); \
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}
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switch(line_buffer.line_mode) {
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case LineMode::Text: { fetch(this->template fetch_tms_text, Clock::TMSMemoryWindow); } break;
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case LineMode::Character: { fetch(this->template fetch_tms_character, Clock::TMSMemoryWindow); } break;
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case LineMode::SMS: { fetch(this->template fetch_sms, Clock::TMSMemoryWindow); } break;
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case LineMode::Refresh: { fetch(this->template fetch_tms_refresh, Clock::TMSMemoryWindow); } break;
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}
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#undef fetch
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// -------------------------------
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// Check for interrupt conditions.
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// -------------------------------
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if(this->fetch_pointer_.column < this->mode_timing_.line_interrupt_position && end_column >= this->mode_timing_.line_interrupt_position) {
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// The Sega VDP offers a decrementing counter for triggering line interrupts;
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// it is reloaded either when it overflows or upon every non-pixel line after the first.
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// It is otherwise decremented.
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if constexpr (is_sega_vdp(personality)) {
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if(this->fetch_pointer_.row >= 0 && this->fetch_pointer_.row <= this->mode_timing_.pixel_lines) {
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--this->line_interrupt_counter_;
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if(this->line_interrupt_counter_ == 0xff) {
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this->line_interrupt_pending_ = true;
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this->line_interrupt_counter_ = this->line_interrupt_target_;
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}
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} else {
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this->line_interrupt_counter_ = this->line_interrupt_target_;
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}
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}
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// TODO: the V9938 provides line interrupts from direct specification of the target line.
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// So life is easy.
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}
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if(
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this->fetch_pointer_.row == this->mode_timing_.end_of_frame_interrupt_position.row &&
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this->fetch_pointer_.column < this->mode_timing_.end_of_frame_interrupt_position.column &&
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end_column >= this->mode_timing_.end_of_frame_interrupt_position.column
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) {
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this->status_ |= StatusInterrupt;
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}
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// -------------
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// Advance time.
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// -------------
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this->fetch_pointer_.column = end_column;
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write_cycles_pool -= write_cycles;
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if(this->fetch_pointer_.column == Timing<personality>::CyclesPerLine) {
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this->fetch_pointer_.column = 0;
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this->fetch_pointer_.row = (this->fetch_pointer_.row + 1) % this->mode_timing_.total_lines;
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LineBuffer &next_line_buffer = this->line_buffers_[this->fetch_pointer_.row];
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// Establish the current screen output mode, which will be captured as a
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// line mode momentarily.
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this->screen_mode_ = this->current_screen_mode();
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// Based on the output mode, pick a line mode.
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next_line_buffer.first_pixel_output_column = Timing<personality>::FirstPixelCycle;
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next_line_buffer.next_border_column = Timing<personality>::CyclesPerLine;
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next_line_buffer.pixel_count = 256;
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this->mode_timing_.maximum_visible_sprites = 4;
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switch(this->screen_mode_) {
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case ScreenMode::Text:
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next_line_buffer.line_mode = LineMode::Text;
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next_line_buffer.first_pixel_output_column = Timing<personality>::FirstTextCycle;
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next_line_buffer.next_border_column = Timing<personality>::LastTextCycle;
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next_line_buffer.pixel_count = 240;
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break;
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case ScreenMode::SMSMode4:
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next_line_buffer.line_mode = LineMode::SMS;
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this->mode_timing_.maximum_visible_sprites = 8;
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break;
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case ScreenMode::YamahaGraphics3:
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case ScreenMode::YamahaGraphics4:
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case ScreenMode::YamahaGraphics5:
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case ScreenMode::YamahaGraphics6:
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case ScreenMode::YamahaGraphics7:
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// TODO: actual line modes.
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next_line_buffer.line_mode = LineMode::Refresh;
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break;
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default:
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// This covers both MultiColour and Graphics modes.
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next_line_buffer.line_mode = LineMode::Character;
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break;
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}
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if(
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(this->screen_mode_ == ScreenMode::Blank) ||
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this->is_vertical_blank())
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next_line_buffer.line_mode = LineMode::Refresh;
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}
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}
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#ifndef NDEBUG
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assert(backup.row == this->output_pointer_.row && backup.column == this->output_pointer_.column);
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backup = this->fetch_pointer_;
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#endif
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if(read_cycles_pool) {
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// Determine how much time has passed in the remainder of this line, and proceed.
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const int target_read_cycles = std::min(
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Timing<personality>::CyclesPerLine - this->output_pointer_.column,
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read_cycles_pool
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);
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int read_cycles_performed = 0;
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uint32_t next_cram_value = 0;
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while(read_cycles_performed < target_read_cycles) {
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int read_cycles = target_read_cycles - read_cycles_performed;
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if(!read_cycles) continue;
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// Grab the next CRAM dot value and schedule a break in output if applicable.
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const uint32_t cram_value = next_cram_value;
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if constexpr (is_sega_vdp(personality)) {
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next_cram_value = 0;
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if(!this->upcoming_cram_dots_.empty() && this->upcoming_cram_dots_.front().location.row == this->output_pointer_.row) {
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int time_until_dot = this->upcoming_cram_dots_.front().location.column - this->output_pointer_.column;
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if(time_until_dot < read_cycles) {
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read_cycles = time_until_dot;
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next_cram_value = this->upcoming_cram_dots_.front().value;
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this->upcoming_cram_dots_.erase(this->upcoming_cram_dots_.begin());
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}
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}
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}
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read_cycles_performed += read_cycles;
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const int end_column = this->output_pointer_.column + read_cycles;
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LineBuffer &line_buffer = this->line_buffers_[this->output_pointer_.row];
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// --------------------
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// Output video stream.
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// --------------------
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#define crt_convert(action, time) this->crt_.action(from_internal<personality, Clock::CRT>(time))
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#define output_sync(x) crt_convert(output_sync, x)
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#define output_blank(x) crt_convert(output_blank, x)
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#define output_default_colour_burst(x) crt_convert(output_default_colour_burst, x)
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#define intersect(left, right, code) { \
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const int start = std::max(this->output_pointer_.column, left); \
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const int end = std::min(end_column, right); \
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if(end > start) {\
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code;\
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}\
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}
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#define border(left, right) intersect(left, right, this->output_border(end - start, cram_value))
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if(line_buffer.line_mode == LineMode::Refresh || this->output_pointer_.row > this->mode_timing_.pixel_lines) {
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if(
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this->output_pointer_.row >= this->mode_timing_.first_vsync_line &&
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this->output_pointer_.row < this->mode_timing_.first_vsync_line + 4
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) {
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// Vertical sync.
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// TODO: the Mega Drive supports interlaced video, I think?
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if(end_column == Timing<personality>::CyclesPerLine) {
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output_sync(Timing<personality>::CyclesPerLine);
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}
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} else {
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// Right border.
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border(0, Timing<personality>::EndOfRightBorder);
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// Blanking region: output the entire sequence when the cursor
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// crosses the start-of-border point.
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if(
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this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
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end_column >= Timing<personality>::StartOfLeftBorder
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) {
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output_blank(Timing<personality>::StartOfSync - Timing<personality>::EndOfRightBorder);
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output_sync(Timing<personality>::EndOfSync - Timing<personality>::StartOfSync);
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output_blank(Timing<personality>::StartOfColourBurst - Timing<personality>::EndOfSync);
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output_default_colour_burst(Timing<personality>::EndOfColourBurst - Timing<personality>::StartOfColourBurst);
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output_blank(Timing<personality>::StartOfLeftBorder - Timing<personality>::EndOfColourBurst);
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}
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// Border colour for the rest of the line.
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border(Timing<personality>::StartOfLeftBorder, Timing<personality>::CyclesPerLine);
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}
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} else {
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// Right border.
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border(0, Timing<personality>::EndOfRightBorder);
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// Blanking region.
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if(
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this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
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end_column >= Timing<personality>::StartOfLeftBorder
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) {
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output_blank(Timing<personality>::StartOfSync - Timing<personality>::EndOfRightBorder);
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output_sync(Timing<personality>::EndOfSync - Timing<personality>::StartOfSync);
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output_blank(Timing<personality>::StartOfColourBurst - Timing<personality>::EndOfSync);
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output_default_colour_burst(Timing<personality>::EndOfColourBurst - Timing<personality>::StartOfColourBurst);
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output_blank(Timing<personality>::StartOfLeftBorder - Timing<personality>::EndOfColourBurst);
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}
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// Left border.
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border(Timing<personality>::StartOfLeftBorder, line_buffer.first_pixel_output_column);
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#define draw(function, clock) { \
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const int relative_start = from_internal<personality, clock>(start - line_buffer.first_pixel_output_column); \
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const int relative_end = from_internal<personality, clock>(end - line_buffer.first_pixel_output_column); \
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if(relative_start == relative_end) break; \
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this->function; }
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// Pixel region.
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intersect(
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line_buffer.first_pixel_output_column,
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line_buffer.next_border_column,
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if(!this->asked_for_write_area_) {
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this->asked_for_write_area_ = true;
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this->pixel_origin_ = this->pixel_target_ = reinterpret_cast<uint32_t *>(
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this->crt_.begin_data(line_buffer.pixel_count)
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);
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}
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if(this->pixel_target_) {
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switch(line_buffer.line_mode) {
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case LineMode::SMS: draw(draw_sms(relative_start, relative_end, cram_value), Clock::TMSPixel); break;
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case LineMode::Character: draw(draw_tms_character(relative_start, relative_end), Clock::TMSPixel); break;
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case LineMode::Text: draw(draw_tms_text(relative_start, relative_end), Clock::TMSPixel); break;
|
||
|
||
// TODO: Yamaha line modes.
|
||
|
||
case LineMode::Refresh: break; /* Dealt with elsewhere. */
|
||
}
|
||
}
|
||
|
||
if(end == line_buffer.next_border_column) {
|
||
const int length = line_buffer.next_border_column - line_buffer.first_pixel_output_column;
|
||
this->crt_.output_data(from_internal<personality, Clock::CRT>(length), line_buffer.pixel_count);
|
||
this->pixel_origin_ = this->pixel_target_ = nullptr;
|
||
this->asked_for_write_area_ = false;
|
||
}
|
||
);
|
||
|
||
#undef draw
|
||
|
||
// Additional right border, if called for.
|
||
if(line_buffer.next_border_column != Timing<personality>::CyclesPerLine) {
|
||
border(line_buffer.next_border_column, Timing<personality>::CyclesPerLine);
|
||
}
|
||
}
|
||
|
||
#undef border
|
||
#undef intersect
|
||
|
||
#undef crt_convert
|
||
#undef output_sync
|
||
#undef output_blank
|
||
#undef output_default_colour_burst
|
||
|
||
|
||
|
||
// -------------
|
||
// Advance time.
|
||
// -------------
|
||
this->output_pointer_.column = end_column;
|
||
}
|
||
|
||
read_cycles_pool -= target_read_cycles;
|
||
if(this->output_pointer_.column == Timing<personality>::CyclesPerLine) {
|
||
this->output_pointer_.column = 0;
|
||
this->output_pointer_.row = (this->output_pointer_.row + 1) % this->mode_timing_.total_lines;
|
||
}
|
||
}
|
||
|
||
assert(backup.row == this->fetch_pointer_.row && backup.column == this->fetch_pointer_.column);
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::output_border(int cycles, [[maybe_unused]] uint32_t cram_dot) {
|
||
cycles = from_internal<personality, Clock::CRT>(cycles);
|
||
|
||
uint32_t border_colour;
|
||
if constexpr (is_sega_vdp(personality)) {
|
||
border_colour = Storage<personality>::colour_ram_[16 + background_colour_];
|
||
|
||
if(cram_dot) {
|
||
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
|
||
if(pixel_target) {
|
||
*pixel_target = border_colour | cram_dot;
|
||
}
|
||
|
||
// Four CRT cycles is one pixel width, so this doesn't need clock conversion.
|
||
// TODO: on the Mega Drive it may be only 3 colour cycles, depending on mode.
|
||
crt_.output_level(4);
|
||
cycles -= 4;
|
||
}
|
||
} else {
|
||
border_colour = palette[background_colour_];
|
||
}
|
||
|
||
if(!cycles) {
|
||
return;
|
||
}
|
||
|
||
// If the border colour is 0, that can be communicated
|
||
// more efficiently as an explicit blank.
|
||
if(border_colour) {
|
||
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
|
||
if(pixel_target) {
|
||
*pixel_target = border_colour;
|
||
}
|
||
crt_.output_level(cycles);
|
||
} else {
|
||
crt_.output_blank(cycles);
|
||
}
|
||
}
|
||
|
||
// MARK: - External interface.
|
||
|
||
template <Personality personality>
|
||
int Base<personality>::masked_address(int address) const {
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
return address & 3;
|
||
} else {
|
||
return address & 1;
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::write_vram(uint8_t value) {
|
||
// Latch the value and exit.
|
||
write_phase_ = false;
|
||
|
||
// Enqueue the write to occur at the next available slot.
|
||
read_ahead_buffer_ = value;
|
||
queued_access_ = MemoryAccess::Write;
|
||
cycles_until_access_ = Timing<personality>::VRAMAccessDelay;
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::commit_register(int reg, uint8_t value) {
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
reg &= 0x3f;
|
||
} else if constexpr (is_sega_vdp(personality)) {
|
||
if(reg & 0x40) {
|
||
Storage<personality>::cram_is_selected_ = true;
|
||
return;
|
||
}
|
||
reg &= 0xf;
|
||
} else {
|
||
reg &= 0x7;
|
||
}
|
||
|
||
//
|
||
// Generic TMS functionality.
|
||
//
|
||
switch(reg) {
|
||
case 0:
|
||
mode2_enable_ = value & 0x02;
|
||
break;
|
||
|
||
case 1:
|
||
blank_display_ = !(value & 0x40);
|
||
generate_interrupts_ = value & 0x20;
|
||
mode1_enable_ = value & 0x10;
|
||
mode3_enable_ = value & 0x08;
|
||
sprites_16x16_ = value & 0x02;
|
||
sprites_magnified_ = value & 0x01;
|
||
|
||
sprite_height_ = 8;
|
||
if(sprites_16x16_) sprite_height_ <<= 1;
|
||
if(sprites_magnified_) sprite_height_ <<= 1;
|
||
break;
|
||
|
||
case 2:
|
||
pattern_name_address_ = size_t((value & 0xf) << 10) | 0x3ff;
|
||
break;
|
||
|
||
case 3:
|
||
colour_table_address_ = size_t(value << 6) | 0x3f;
|
||
break;
|
||
|
||
case 4:
|
||
pattern_generator_table_address_ = size_t((value & 0x07) << 11) | 0x7ff;
|
||
break;
|
||
|
||
case 5:
|
||
sprite_attribute_table_address_ = size_t((value & 0x7f) << 7) | 0x7f;
|
||
break;
|
||
|
||
case 6:
|
||
sprite_generator_table_address_ = size_t((value & 0x07) << 11) | 0x7ff;
|
||
break;
|
||
|
||
case 7:
|
||
text_colour_ = value >> 4;
|
||
background_colour_ = value & 0xf;
|
||
break;
|
||
|
||
default: break;
|
||
}
|
||
|
||
//
|
||
// Sega extensions.
|
||
//
|
||
if constexpr (is_sega_vdp(personality)) {
|
||
switch(reg) {
|
||
default: break;
|
||
|
||
case 0:
|
||
Storage<personality>::vertical_scroll_lock_ = value & 0x80;
|
||
Storage<personality>::horizontal_scroll_lock_ = value & 0x40;
|
||
Storage<personality>::hide_left_column_ = value & 0x20;
|
||
enable_line_interrupts_ = value & 0x10;
|
||
Storage<personality>::shift_sprites_8px_left_ = value & 0x08;
|
||
Storage<personality>::mode4_enable_ = value & 0x04;
|
||
break;
|
||
|
||
case 2:
|
||
Storage<personality>::pattern_name_address_ = pattern_name_address_ | ((personality == TMS::SMSVDP) ? 0x000 : 0x400);
|
||
break;
|
||
|
||
case 5:
|
||
Storage<personality>::sprite_attribute_table_address_ = sprite_attribute_table_address_ | ((personality == TMS::SMSVDP) ? 0x00 : 0x80);
|
||
break;
|
||
|
||
case 6:
|
||
Storage<personality>::sprite_generator_table_address_ = sprite_generator_table_address_ | ((personality == TMS::SMSVDP) ? 0x0000 : 0x1800);
|
||
break;
|
||
|
||
case 8:
|
||
Storage<personality>::horizontal_scroll_ = value;
|
||
break;
|
||
|
||
case 9:
|
||
Storage<personality>::vertical_scroll_ = value;
|
||
break;
|
||
|
||
case 10:
|
||
line_interrupt_target_ = value;
|
||
break;
|
||
}
|
||
}
|
||
|
||
//
|
||
// Yamaha extensions.
|
||
//
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
switch(reg) {
|
||
default: break;
|
||
|
||
case 0:
|
||
Storage<personality>::mode_ = uint8_t(
|
||
(Storage<personality>::mode_ & 3) |
|
||
((value & 0xe) << 1)
|
||
);
|
||
|
||
LOG("TODO: Yamaha additional mode selection; " << PADHEX(2) << +value);
|
||
// b1–b3: M3–M5
|
||
// b4: enable horizontal retrace interrupt
|
||
// b5: enable light pen interrupts
|
||
// b6: set colour bus to input or output mode
|
||
|
||
LOG("Screen mode: " << int(current_screen_mode()));
|
||
break;
|
||
|
||
case 1:
|
||
Storage<personality>::mode_ = uint8_t(
|
||
(Storage<personality>::mode_ & 0x1c) |
|
||
((value & 0x10) >> 4) |
|
||
((value & 0x08) >> 2)
|
||
);
|
||
|
||
LOG("Screen mode: " << int(current_screen_mode()));
|
||
break;
|
||
|
||
case 8:
|
||
LOG("TODO: Yamaha VRAM organisation, sprite disable, etc; " << PADHEX(2) << +value);
|
||
// b7: "1 = input on colour bus, enable mouse; 1 = output on colour bus, disable mouse" [documentation clearly in error]
|
||
// b6: 1 = enable light pen
|
||
// b5: sets the colour of code 0 to the colour of the palette (???)
|
||
// b4: 1 = colour bus in input mode; 0 = colour bus in output mode
|
||
// b3: 1 = VRAM is 64kx1 or 64kx4; 0 = 16kx1 or 16kx4; affects refresh.
|
||
// b1: 1 = disable sprites (and release sprite access slots)
|
||
// b0: 1 = output in grayscale
|
||
break;
|
||
|
||
case 9:
|
||
LOG("TODO: Yamaha line count, interlace, etc; " << PADHEX(2) << +value);
|
||
// b7: 1 = 212 lines of pixels; 0 = 192
|
||
// b5 & b4: select simultaneous mode (seems to relate to line length and in-phase colour?)
|
||
// b3: 1 = interlace on
|
||
// b2: 1 = display two graphic screens interchangeably by even/odd field
|
||
// b1: 1 = PAL mode; 0 = NTSC mode
|
||
// b0: 1 = [dot clock] DLCLK is input; 0 = DLCLK is output
|
||
break;
|
||
|
||
case 10:
|
||
LOG("TODO: Yamaha colour table high bits; " << PADHEX(2) << +value);
|
||
// b0–b2: A14–A16 of the colour table.
|
||
break;
|
||
|
||
case 11:
|
||
LOG("TODO: Yamaha sprite table high bits; " << PADHEX(2) << +value);
|
||
// b0–b1: A15–A16 of the sprite table.
|
||
break;
|
||
|
||
case 12:
|
||
LOG("TODO: Yamaha text and background blink colour; " << PADHEX(2) << +value);
|
||
// as per register 7, but in blink mode.
|
||
break;
|
||
|
||
case 13:
|
||
LOG("TODO: Yamaha blink display times; " << PADHEX(2) << +value);
|
||
// b0–b3: display time for odd page;
|
||
// b4–b7: display time for even page.
|
||
break;
|
||
|
||
case 14:
|
||
LOG("TODO: Yamaha A14–A16 selection; " << PADHEX(2) << +value);
|
||
// b0–b2: A14–A16 of address counter (i.e. ram_pointer_)
|
||
break;
|
||
|
||
case 15:
|
||
Storage<personality>::selected_status_ = value & 0xf;
|
||
break;
|
||
|
||
case 16:
|
||
Storage<personality>::palette_entry_ = value;
|
||
// b0–b3: palette entry for writing on port 2; autoincrements upon every write.
|
||
break;
|
||
|
||
case 17:
|
||
Storage<personality>::increment_indirect_register_ = !(value & 0x80);
|
||
Storage<personality>::indirect_register_ = value & 0x3f;
|
||
break;
|
||
|
||
case 18:
|
||
LOG("TODO: Yamaha position adjustment; " << PADHEX(2) << +value);
|
||
// b0-b3: horizontal adjustment
|
||
// b4-b7: vertical adjustment
|
||
break;
|
||
|
||
case 19:
|
||
LOG("TODO: Yamaha interrupt line; " << PADHEX(2) << +value);
|
||
// b0–b7: line to match for interrupts (if eabled)
|
||
break;
|
||
|
||
case 20:
|
||
case 21:
|
||
case 22:
|
||
LOG("TODO: Yamaha colour burst selection; " << PADHEX(2) << +value);
|
||
// Documentation is "fill with 0s for no colour burst; magic pattern for colour burst"
|
||
break;
|
||
|
||
case 23:
|
||
LOG("TODO: Yamaha vertical offset; " << PADHEX(2) << +value);
|
||
// i.e. scrolling.
|
||
break;
|
||
|
||
case 32:
|
||
case 33:
|
||
LOG("TODO: Yamaha command source x; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 34:
|
||
case 35:
|
||
LOG("TODO: Yamaha command source y; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 36:
|
||
case 37:
|
||
LOG("TODO: Yamaha command destination x; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 38:
|
||
case 39:
|
||
LOG("TODO: Yamaha command destination y; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 40:
|
||
case 41:
|
||
LOG("TODO: Yamaha command size x; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 42:
|
||
case 43:
|
||
LOG("TODO: Yamaha command size y; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 44:
|
||
LOG("TODO: Yamaha command colour; " << PADHEX(2) << +value);
|
||
break;
|
||
|
||
case 45:
|
||
LOG("TODO: Yamaha VRAM bank selection addressing and command arguments; " << PADHEX(2) << +value);
|
||
// b6: 0 = video RAM; 1 = expandion RAM.
|
||
// b5: MXD (???)
|
||
// b4: MXS
|
||
// b3: DIY
|
||
// b2: DIX
|
||
// b1: EQ
|
||
// b0: MAJ
|
||
break;
|
||
|
||
case 46:
|
||
LOG("TODO: Yamaha command; " << PADHEX(2) << +value);
|
||
// b0–b3: LO0–LO3 (???)
|
||
// b4–b7: CM0-CM3 (???)
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::write_register(uint8_t value) {
|
||
// Writes to address 1 are performed in pairs; if this is the
|
||
// low byte of a value, store it and wait for the high byte.
|
||
if(!write_phase_) {
|
||
low_write_ = value;
|
||
write_phase_ = true;
|
||
|
||
// The initial write should half update the access pointer.
|
||
ram_pointer_ = (ram_pointer_ & 0xff00) | low_write_;
|
||
return;
|
||
}
|
||
|
||
// The RAM pointer is always set on a second write, regardless of
|
||
// whether the caller is intending to enqueue a VDP operation.
|
||
ram_pointer_ = (ram_pointer_ & 0x00ff) | uint16_t(value << 8);
|
||
|
||
write_phase_ = false;
|
||
if(value & 0x80) {
|
||
commit_register(value, low_write_);
|
||
} else {
|
||
// This is an access via the RAM pointer.
|
||
if(!(value & 0x40)) {
|
||
// A read request is enqueued upon setting the address; conversely a write
|
||
// won't be enqueued unless and until some actual data is supplied.
|
||
queued_access_ = MemoryAccess::Read;
|
||
cycles_until_access_ = Timing<personality>::VRAMAccessDelay;
|
||
}
|
||
|
||
if constexpr (is_sega_vdp(personality)) {
|
||
Storage<personality>::cram_is_selected_ = false;
|
||
}
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::write_palette(uint8_t value) {
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
if(!write_phase_) {
|
||
Storage<personality>::new_colour_ = value;
|
||
write_phase_ = true;
|
||
return;
|
||
}
|
||
|
||
write_phase_ = false;
|
||
|
||
const uint8_t r = ((Storage<personality>::new_colour_ >> 4) & 7) * 255 / 7;
|
||
const uint8_t g = (value & 7) * 255 / 7;
|
||
const uint8_t b = (Storage<personality>::new_colour_ & 7) * 255 / 7;
|
||
|
||
Storage<personality>::palette_[Storage<personality>::palette_entry_ & 0xf] = palette_pack(r, g, b);
|
||
++Storage<personality>::palette_entry_;
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void Base<personality>::write_register_indirect([[maybe_unused]] uint8_t value) {
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
// Register 17 cannot be written to indirectly.
|
||
if(Storage<personality>::indirect_register_ != 17) {
|
||
commit_register(Storage<personality>::indirect_register_, value);
|
||
}
|
||
Storage<personality>::indirect_register_ += Storage<personality>::increment_indirect_register_;
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
void TMS9918<personality>::write(int address, uint8_t value) {
|
||
switch(this->masked_address(address)) {
|
||
default: break;
|
||
case 0: this->write_vram(value); break;
|
||
case 1: this->write_register(value); break;
|
||
case 2: this->write_palette(value); break;
|
||
case 3: this->write_register_indirect(value); break;
|
||
}
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t Base<personality>::read_vram() {
|
||
// Take whatever is currently in the read-ahead buffer and
|
||
// enqueue a further read to occur at the next available slot.
|
||
const uint8_t result = read_ahead_buffer_;
|
||
queued_access_ = MemoryAccess::Read;
|
||
return result;
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t Base<personality>::read_register() {
|
||
if constexpr (is_yamaha_vdp(personality)) {
|
||
switch(Storage<personality>::selected_status_) {
|
||
case 0: break;
|
||
|
||
case 2:
|
||
// b7 = transfer ready flag (i.e. VDP ready for next transfer)
|
||
// b6 = 1 during vblank
|
||
// b5 = 1 during hblank
|
||
// b4 = set if colour detected during search command
|
||
// b1 = display field odd/even
|
||
// b0 = command ongoing
|
||
return
|
||
(queued_access_ == MemoryAccess::None ? 0x80 : 0x00) |
|
||
(is_vertical_blank() ? 0x40 : 0x00) |
|
||
(is_horizontal_blank() ? 0x20 : 0x00);
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
// Gets the status register.
|
||
const uint8_t result = status_;
|
||
status_ &= ~(StatusInterrupt | StatusSpriteOverflow | StatusSpriteCollision);
|
||
line_interrupt_pending_ = false;
|
||
return result;
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t Base<personality>::read_palette() {
|
||
LOG("Palette read TODO");
|
||
return 0xff;
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t Base<personality>::read_register_indirect() {
|
||
LOG("Register indirect read TODO");
|
||
return 0xff;
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t TMS9918<personality>::read(int address) {
|
||
// TODO: is this still a global effect of reads, even in the world of the Yamahas?
|
||
this->write_phase_ = false;
|
||
|
||
switch(this->masked_address(address)) {
|
||
default: return 0xff;
|
||
case 0: return this->read_vram();
|
||
case 1: return this->read_register();
|
||
case 2: return this->read_palette();
|
||
case 3: return this->read_register_indirect();
|
||
}
|
||
}
|
||
|
||
// MARK: - Ephemeral state.
|
||
|
||
template <Personality personality>
|
||
int Base<personality>::fetch_line() const {
|
||
// This is the proper Master System value; TODO: what's correct for Yamaha, etc?
|
||
constexpr int row_change_position = 63;
|
||
|
||
return
|
||
(this->fetch_pointer_.column < row_change_position)
|
||
? (this->fetch_pointer_.row + this->mode_timing_.total_lines - 1) % this->mode_timing_.total_lines
|
||
: this->fetch_pointer_.row;
|
||
}
|
||
|
||
template <Personality personality>
|
||
bool Base<personality>::is_vertical_blank() const {
|
||
return fetch_pointer_.row >= mode_timing_.pixel_lines && fetch_pointer_.row != mode_timing_.total_lines - 1;
|
||
}
|
||
|
||
template <Personality personality>
|
||
bool Base<personality>::is_horizontal_blank() const {
|
||
return fetch_pointer_.column < StandardTiming<personality>::FirstPixelCycle;
|
||
}
|
||
|
||
template <Personality personality>
|
||
uint8_t TMS9918<personality>::get_current_line() const {
|
||
int source_row = this->fetch_line();
|
||
|
||
if(this->tv_standard_ == TVStandard::NTSC) {
|
||
if(this->mode_timing_.pixel_lines == 240) {
|
||
// NTSC 256x240: 00-FF, 00-06
|
||
} else if(this->mode_timing_.pixel_lines == 224) {
|
||
// NTSC 256x224: 00-EA, E5-FF
|
||
if(source_row >= 0xeb) source_row -= 6;
|
||
} else {
|
||
// NTSC 256x192: 00-DA, D5-FF
|
||
if(source_row >= 0xdb) source_row -= 6;
|
||
}
|
||
} else {
|
||
if(this->mode_timing_.pixel_lines == 240) {
|
||
// PAL 256x240: 00-FF, 00-0A, D2-FF
|
||
if(source_row >= 267) source_row -= 0x39;
|
||
} else if(this->mode_timing_.pixel_lines == 224) {
|
||
// PAL 256x224: 00-FF, 00-02, CA-FF
|
||
if(source_row >= 259) source_row -= 0x39;
|
||
} else {
|
||
// PAL 256x192: 00-F2, BA-FF
|
||
if(source_row >= 0xf3) source_row -= 0x39;
|
||
}
|
||
}
|
||
|
||
return uint8_t(source_row);
|
||
}
|
||
template <Personality personality>
|
||
HalfCycles TMS9918<personality>::get_next_sequence_point() const {
|
||
if(!this->generate_interrupts_ && !this->enable_line_interrupts_) return HalfCycles::max();
|
||
if(get_interrupt_line()) return HalfCycles::max();
|
||
|
||
// Calculate the amount of time until the next end-of-frame interrupt.
|
||
const int frame_length = Timing<personality>::CyclesPerLine * this->mode_timing_.total_lines;
|
||
int time_until_frame_interrupt =
|
||
(
|
||
((this->mode_timing_.end_of_frame_interrupt_position.row * Timing<personality>::CyclesPerLine) + this->mode_timing_.end_of_frame_interrupt_position.column + frame_length) -
|
||
((this->fetch_pointer_.row * Timing<personality>::CyclesPerLine) + this->fetch_pointer_.column)
|
||
) % frame_length;
|
||
if(!time_until_frame_interrupt) time_until_frame_interrupt = frame_length;
|
||
|
||
if(!this->enable_line_interrupts_) {
|
||
return this->clock_converter_.half_cycles_before_internal_cycles(time_until_frame_interrupt);
|
||
}
|
||
|
||
// Calculate when the next line interrupt will occur.
|
||
int next_line_interrupt_row = -1;
|
||
|
||
int cycles_to_next_interrupt_threshold = this->mode_timing_.line_interrupt_position - this->fetch_pointer_.column;
|
||
int line_of_next_interrupt_threshold = this->fetch_pointer_.row;
|
||
if(cycles_to_next_interrupt_threshold <= 0) {
|
||
cycles_to_next_interrupt_threshold += Timing<personality>::CyclesPerLine;
|
||
++line_of_next_interrupt_threshold;
|
||
}
|
||
|
||
if constexpr (is_sega_vdp(personality)) {
|
||
// If there is still time for a line interrupt this frame, that'll be it;
|
||
// otherwise it'll be on the next frame, supposing there's ever time for
|
||
// it at all.
|
||
if(line_of_next_interrupt_threshold + this->line_interrupt_counter_ <= this->mode_timing_.pixel_lines) {
|
||
next_line_interrupt_row = line_of_next_interrupt_threshold + this->line_interrupt_counter_;
|
||
} else {
|
||
if(this->line_interrupt_target_ <= this->mode_timing_.pixel_lines)
|
||
next_line_interrupt_row = this->mode_timing_.total_lines + this->line_interrupt_target_;
|
||
}
|
||
}
|
||
|
||
// If there's actually no interrupt upcoming, despite being enabled, either return
|
||
// the frame end interrupt or no interrupt pending as appropriate.
|
||
if(next_line_interrupt_row == -1) {
|
||
return this->generate_interrupts_ ?
|
||
this->clock_converter_.half_cycles_before_internal_cycles(time_until_frame_interrupt) :
|
||
HalfCycles::max();
|
||
}
|
||
|
||
// Figure out the number of internal cycles until the next line interrupt, which is the amount
|
||
// of time to the next tick over and then next_line_interrupt_row - row_ lines further.
|
||
const int local_cycles_until_line_interrupt = cycles_to_next_interrupt_threshold + (next_line_interrupt_row - line_of_next_interrupt_threshold) * Timing<personality>::CyclesPerLine;
|
||
if(!this->generate_interrupts_) return this->clock_converter_.half_cycles_before_internal_cycles(local_cycles_until_line_interrupt);
|
||
|
||
// Return whichever interrupt is closer.
|
||
return this->clock_converter_.half_cycles_before_internal_cycles(std::min(local_cycles_until_line_interrupt, time_until_frame_interrupt));
|
||
}
|
||
|
||
template <Personality personality>
|
||
HalfCycles TMS9918<personality>::get_time_until_line(int line) {
|
||
if(line < 0) line += this->mode_timing_.total_lines;
|
||
|
||
int cycles_to_next_interrupt_threshold = this->mode_timing_.line_interrupt_position - this->fetch_pointer_.column;
|
||
int line_of_next_interrupt_threshold = this->fetch_pointer_.row;
|
||
if(cycles_to_next_interrupt_threshold <= 0) {
|
||
cycles_to_next_interrupt_threshold += Timing<personality>::CyclesPerLine;
|
||
++line_of_next_interrupt_threshold;
|
||
}
|
||
|
||
if(line_of_next_interrupt_threshold > line) {
|
||
line += this->mode_timing_.total_lines;
|
||
}
|
||
|
||
return this->clock_converter_.half_cycles_before_internal_cycles(cycles_to_next_interrupt_threshold + (line - line_of_next_interrupt_threshold)*Timing<personality>::CyclesPerLine);
|
||
}
|
||
|
||
template <Personality personality>
|
||
bool TMS9918<personality>::get_interrupt_line() const {
|
||
return
|
||
((this->status_ & StatusInterrupt) && this->generate_interrupts_) ||
|
||
(this->enable_line_interrupts_ && this->line_interrupt_pending_);
|
||
}
|
||
|
||
// TODO: [potentially] remove Master System timing assumptions in latch and get_latched below.
|
||
template <Personality personality>uint8_t TMS9918<personality>::get_latched_horizontal_counter() const {
|
||
// Translate from internal numbering, which puts pixel output
|
||
// in the final 256 pixels of 342, to the public numbering,
|
||
// which counts the 256 pixels as items 0–255, starts
|
||
// counting at -48, and returns only the top 8 bits of the number.
|
||
int public_counter = this->latched_column_ - (342 - 256);
|
||
if(public_counter < -46) public_counter += 342;
|
||
return uint8_t(public_counter >> 1);
|
||
}
|
||
|
||
template <Personality personality>
|
||
void TMS9918<personality>::latch_horizontal_counter() {
|
||
this->latched_column_ = this->fetch_pointer_.column;
|
||
}
|
||
|
||
template class TI::TMS::TMS9918<Personality::TMS9918A>;
|
||
template class TI::TMS::TMS9918<Personality::V9938>;
|
||
//template class TI::TMS::TMS9918<Personality::V9958>;
|
||
template class TI::TMS::TMS9918<Personality::SMSVDP>;
|
||
template class TI::TMS::TMS9918<Personality::SMS2VDP>;
|
||
//template class TI::TMS::TMS9918<Personality::GGVDP>;
|
||
//template class TI::TMS::TMS9918<Personality::MDVDP>;
|