2017-11-26 18:28:26 +00:00
|
|
|
|
//
|
|
|
|
|
// 9918.cpp
|
|
|
|
|
// Clock Signal
|
|
|
|
|
//
|
|
|
|
|
// Created by Thomas Harte on 25/11/2017.
|
2018-05-13 19:19:52 +00:00
|
|
|
|
// Copyright 2017 Thomas Harte. All rights reserved.
|
2017-11-26 18:28:26 +00:00
|
|
|
|
//
|
|
|
|
|
|
2023-01-01 19:01:19 +00:00
|
|
|
|
#include "../9918.hpp"
|
2017-11-26 18:28:26 +00:00
|
|
|
|
|
2017-12-07 01:24:29 +00:00
|
|
|
|
#include <cassert>
|
2017-12-06 03:39:03 +00:00
|
|
|
|
#include <cstring>
|
2018-10-27 01:02:56 +00:00
|
|
|
|
#include <cstdlib>
|
2023-01-01 19:01:19 +00:00
|
|
|
|
#include "../../../Outputs/Log.hpp"
|
2017-12-06 03:39:03 +00:00
|
|
|
|
|
2018-09-18 02:59:16 +00:00
|
|
|
|
using namespace TI::TMS;
|
2017-11-26 18:28:26 +00:00
|
|
|
|
|
2017-11-28 03:05:40 +00:00
|
|
|
|
namespace {
|
|
|
|
|
|
2018-10-20 01:36:13 +00:00
|
|
|
|
// 342 internal cycles are 228/227.5ths of a line, so 341.25 cycles should be a whole
|
|
|
|
|
// line. Therefore multiply everything by four, but set line length to 1365 rather than 342*4 = 1368.
|
2019-12-22 05:22:17 +00:00
|
|
|
|
constexpr unsigned int CRTCyclesPerLine = 1365;
|
|
|
|
|
constexpr unsigned int CRTCyclesDivider = 4;
|
2018-10-20 01:36:13 +00:00
|
|
|
|
|
2017-11-28 03:05:40 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-01 02:50:57 +00:00
|
|
|
|
Base<personality>::Base() :
|
2018-11-15 03:25:19 +00:00
|
|
|
|
crt_(CRTCyclesPerLine, CRTCyclesDivider, Outputs::Display::Type::NTSC60, Outputs::Display::InputDataType::Red8Green8Blue8) {
|
2018-11-23 03:47:29 +00:00
|
|
|
|
// Unimaginatively, this class just passes RGB through to the shader. Investigation is needed
|
|
|
|
|
// into whether there's a more natural form. It feels unlikely given the diversity of chips modelled.
|
2018-09-18 02:59:16 +00:00
|
|
|
|
|
2023-01-01 02:50:57 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2018-10-21 17:58:34 +00:00
|
|
|
|
mode_timing_.line_interrupt_position = 64;
|
2018-10-12 22:57:07 +00:00
|
|
|
|
|
2018-10-12 01:42:09 +00:00
|
|
|
|
mode_timing_.end_of_frame_interrupt_position.column = 63;
|
|
|
|
|
mode_timing_.end_of_frame_interrupt_position.row = 193;
|
2018-10-05 02:50:35 +00:00
|
|
|
|
}
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2018-10-27 01:02:56 +00:00
|
|
|
|
// Establish that output is delayed after reading by `output_lag` cycles; start
|
|
|
|
|
// at a random position.
|
2023-01-21 01:29:15 +00:00
|
|
|
|
fetch_pointer_.row = rand() % 262;
|
|
|
|
|
fetch_pointer_.column = rand() % (Timing<personality>::CyclesPerLine - output_lag);
|
|
|
|
|
output_pointer_.row = output_pointer_.row;
|
|
|
|
|
output_pointer_.column = output_pointer_.column + output_lag;
|
2018-09-18 02:59:16 +00:00
|
|
|
|
}
|
2017-12-15 01:27:26 +00:00
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-01 02:50:57 +00:00
|
|
|
|
TMS9918<personality>::TMS9918() {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->crt_.set_display_type(Outputs::Display::DisplayType::RGB);
|
|
|
|
|
this->crt_.set_visible_area(Outputs::Display::Rect(0.07f, 0.0375f, 0.875f, 0.875f));
|
2018-03-03 18:53:00 +00:00
|
|
|
|
|
|
|
|
|
// The TMS remains in-phase with the NTSC colour clock; this is an empirical measurement
|
|
|
|
|
// intended to produce the correct relationship between the hard edges between pixels and
|
|
|
|
|
// the colour clock. It was eyeballed rather than derived from any knowledge of the TMS
|
|
|
|
|
// colour burst generator because I've yet to find any.
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->crt_.set_immediate_default_phase(0.85f);
|
2017-11-26 18:28:26 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void TMS9918<personality>::set_tv_standard(TVStandard standard) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->tv_standard_ = standard;
|
2018-10-20 01:36:13 +00:00
|
|
|
|
switch(standard) {
|
|
|
|
|
case TVStandard::PAL:
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.total_lines = 313;
|
|
|
|
|
this->mode_timing_.first_vsync_line = 253;
|
|
|
|
|
this->crt_.set_new_display_type(CRTCyclesPerLine, Outputs::Display::Type::PAL50);
|
2018-10-20 01:36:13 +00:00
|
|
|
|
break;
|
|
|
|
|
default:
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.total_lines = 262;
|
|
|
|
|
this->mode_timing_.first_vsync_line = 227;
|
|
|
|
|
this->crt_.set_new_display_type(CRTCyclesPerLine, Outputs::Display::Type::NTSC60);
|
2018-10-20 01:36:13 +00:00
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void TMS9918<personality>::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->crt_.set_scan_target(scan_target);
|
2017-11-26 18:28:26 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
Outputs::Display::ScanStatus TMS9918<personality>::get_scaled_scan_status() const {
|
2020-01-23 00:34:10 +00:00
|
|
|
|
// The input was scaled by 3/4 to convert half cycles to internal ticks,
|
|
|
|
|
// so undo that and also allow for: (i) the multiply by 4 that it takes
|
|
|
|
|
// to reach the CRT; and (ii) the fact that the half-cycles value was scaled,
|
|
|
|
|
// and this should really reply in whole cycles.
|
2023-01-01 02:47:05 +00:00
|
|
|
|
return this->crt_.get_scaled_scan_status() * (4.0f / (3.0f * 8.0f));
|
2020-01-21 02:45:10 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void TMS9918<personality>::set_display_type(Outputs::Display::DisplayType display_type) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->crt_.set_display_type(display_type);
|
2018-11-30 04:44:21 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
Outputs::Display::DisplayType TMS9918<personality>::get_display_type() const {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
return this->crt_.get_display_type();
|
2020-03-18 04:06:52 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
void LineBuffer::reset_sprite_collection() {
|
2018-10-14 20:23:45 +00:00
|
|
|
|
sprites_stopped = false;
|
|
|
|
|
active_sprite_slot = 0;
|
2018-10-09 02:43:10 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
for(int c = 0; c < 8; ++c) {
|
|
|
|
|
active_sprites[c].shift_position = 0;
|
2018-10-09 02:43:10 +00:00
|
|
|
|
}
|
2018-10-06 23:27:19 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void Base<personality>::posit_sprite(LineBuffer &buffer, int sprite_number, int sprite_position, int screen_row) {
|
2018-10-06 23:27:19 +00:00
|
|
|
|
if(!(status_ & StatusSpriteOverflow)) {
|
2020-05-10 03:00:39 +00:00
|
|
|
|
status_ = uint8_t((status_ & ~0x1f) | (sprite_number & 0x1f));
|
2017-12-06 03:39:03 +00:00
|
|
|
|
}
|
2022-12-30 03:09:14 +00:00
|
|
|
|
if(buffer.sprites_stopped) return;
|
2017-12-06 03:39:03 +00:00
|
|
|
|
|
|
|
|
|
// A sprite Y of 208 means "don't scan the list any further".
|
2018-10-24 00:01:47 +00:00
|
|
|
|
if(mode_timing_.allow_sprite_terminator && sprite_position == mode_timing_.sprite_terminator) {
|
2018-10-14 20:23:45 +00:00
|
|
|
|
buffer.sprites_stopped = true;
|
2017-12-06 03:39:03 +00:00
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
2018-10-19 01:48:57 +00:00
|
|
|
|
const int sprite_row = (((screen_row + 1) % mode_timing_.total_lines) - ((sprite_position + 1) & 255)) & 255;
|
2017-12-07 01:24:29 +00:00
|
|
|
|
if(sprite_row < 0 || sprite_row >= sprite_height_) return;
|
2017-12-09 03:12:39 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
if(buffer.active_sprite_slot == mode_timing_.maximum_visible_sprites) {
|
2018-10-06 23:27:19 +00:00
|
|
|
|
status_ |= StatusSpriteOverflow;
|
2017-12-06 03:39:03 +00:00
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
LineBuffer::ActiveSprite &sprite = buffer.active_sprites[buffer.active_sprite_slot];
|
2017-12-09 03:20:21 +00:00
|
|
|
|
sprite.index = sprite_number;
|
2017-12-10 01:30:12 +00:00
|
|
|
|
sprite.row = sprite_row >> (sprites_magnified_ ? 1 : 0);
|
2018-10-14 20:23:45 +00:00
|
|
|
|
++buffer.active_sprite_slot;
|
2017-12-06 03:39:03 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void TMS9918<personality>::run_for(const HalfCycles cycles) {
|
2017-11-28 00:43:33 +00:00
|
|
|
|
// As specific as I've been able to get:
|
2017-12-10 01:30:12 +00:00
|
|
|
|
// Scanline time is always 228 cycles.
|
2017-11-28 00:43:33 +00:00
|
|
|
|
// PAL output is 313 lines total. NTSC output is 262 lines total.
|
|
|
|
|
// Interrupt is signalled upon entering the lower border.
|
|
|
|
|
|
2017-12-14 03:37:27 +00:00
|
|
|
|
// Convert 456 clocked half cycles per line to 342 internal cycles per line;
|
|
|
|
|
// the internal clock is 1.5 times the nominal 3.579545 Mhz that I've advertised
|
|
|
|
|
// for this part. So multiply by three quarters.
|
2023-01-02 20:04:08 +00:00
|
|
|
|
const int int_cycles = this->clock_converter_.to_internal(cycles.as<int>());
|
2017-11-28 02:36:12 +00:00
|
|
|
|
if(!int_cycles) return;
|
2017-11-28 00:43:33 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
// There are two intertwined processes here, 'writing' (which means writing to the
|
|
|
|
|
// line buffers, i.e. it's everything to do with collecting a line) and 'reading'
|
|
|
|
|
// (which means reading from the line buffers and generating video).
|
|
|
|
|
int write_cycles_pool = int_cycles;
|
|
|
|
|
int read_cycles_pool = int_cycles;
|
|
|
|
|
|
|
|
|
|
while(write_cycles_pool || read_cycles_pool) {
|
2020-09-16 22:15:57 +00:00
|
|
|
|
#ifndef NDEBUG
|
2023-01-21 01:29:15 +00:00
|
|
|
|
LineBufferPointer backup = this->output_pointer_;
|
2020-09-16 22:15:57 +00:00
|
|
|
|
#endif
|
2018-10-14 22:19:11 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
if(write_cycles_pool) {
|
|
|
|
|
// Determine how much writing to do.
|
2023-01-01 19:20:45 +00:00
|
|
|
|
const int write_cycles = std::min(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
Timing<personality>::CyclesPerLine - this->fetch_pointer_.column,
|
2023-01-01 19:20:45 +00:00
|
|
|
|
write_cycles_pool
|
|
|
|
|
);
|
2023-01-21 01:29:15 +00:00
|
|
|
|
const int end_column = this->fetch_pointer_.column + write_cycles;
|
|
|
|
|
LineBuffer &line_buffer = this->line_buffers_[this->fetch_pointer_.row];
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2018-10-27 00:19:08 +00:00
|
|
|
|
// Determine what this does to any enqueued VRAM access.
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->minimum_access_column_ = this->fetch_pointer_.column + this->cycles_until_access_;
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->cycles_until_access_ -= write_cycles;
|
2018-10-02 03:03:17 +00:00
|
|
|
|
|
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
// ---------------------------------------
|
|
|
|
|
// Latch scrolling position, if necessary.
|
|
|
|
|
// ---------------------------------------
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(this->fetch_pointer_.column < 61 && end_column >= 61) {
|
|
|
|
|
if(!this->fetch_pointer_.row) {
|
2023-01-19 20:09:16 +00:00
|
|
|
|
Storage<personality>::latched_vertical_scroll_ = Storage<personality>::vertical_scroll_;
|
2018-10-24 01:20:44 +00:00
|
|
|
|
|
2023-01-19 20:09:16 +00:00
|
|
|
|
if(Storage<personality>::mode4_enable_) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.pixel_lines = 192;
|
|
|
|
|
if(this->mode2_enable_ && this->mode1_enable_) this->mode_timing_.pixel_lines = 224;
|
|
|
|
|
if(this->mode2_enable_ && this->mode3_enable_) this->mode_timing_.pixel_lines = 240;
|
2018-10-24 01:20:44 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.allow_sprite_terminator = this->mode_timing_.pixel_lines == 192;
|
|
|
|
|
this->mode_timing_.first_vsync_line = (this->mode_timing_.total_lines + this->mode_timing_.pixel_lines) >> 1;
|
2018-10-24 01:20:44 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.end_of_frame_interrupt_position.row = this->mode_timing_.pixel_lines + 1;
|
2018-10-24 01:20:44 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
2023-01-19 20:09:16 +00:00
|
|
|
|
line_buffer.latched_horizontal_scroll = Storage<personality>::horizontal_scroll_;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
2018-10-12 02:36:27 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
|
|
|
|
// ------------------------
|
|
|
|
|
// Perform memory accesses.
|
|
|
|
|
// ------------------------
|
2023-01-27 02:38:51 +00:00
|
|
|
|
#define fetch(function, clock, offset) { \
|
2023-01-21 01:29:15 +00:00
|
|
|
|
const int first_window = from_internal<personality, clock>(this->fetch_pointer_.column);\
|
2023-01-10 03:34:56 +00:00
|
|
|
|
const int final_window = from_internal<personality, clock>(end_column); \
|
2023-01-02 20:04:08 +00:00
|
|
|
|
if(first_window == final_window) break; \
|
2023-01-10 03:34:56 +00:00
|
|
|
|
if(final_window != clock_rate<personality, clock>()) { \
|
2023-01-24 17:46:09 +00:00
|
|
|
|
function<true>( \
|
2023-01-27 02:38:51 +00:00
|
|
|
|
this->line_buffers_[this->fetch_pointer_.row], this->fetch_pointer_.row + offset, \
|
2023-01-24 17:46:09 +00:00
|
|
|
|
first_window, final_window); \
|
2023-01-02 19:59:36 +00:00
|
|
|
|
} else { \
|
2023-01-24 17:46:09 +00:00
|
|
|
|
function<false>( \
|
2023-01-27 02:38:51 +00:00
|
|
|
|
this->line_buffers_[this->fetch_pointer_.row], this->fetch_pointer_.row + offset, \
|
2023-01-24 17:46:09 +00:00
|
|
|
|
first_window, final_window); \
|
2023-01-22 03:47:16 +00:00
|
|
|
|
} \
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-02 19:59:36 +00:00
|
|
|
|
switch(line_buffer.line_mode) {
|
2023-01-27 02:38:51 +00:00
|
|
|
|
case LineMode::Text: fetch(this->template fetch_tms_text, Clock::TMSMemoryWindow, 0); break;
|
|
|
|
|
case LineMode::Character: fetch(this->template fetch_tms_character, Clock::TMSMemoryWindow, 0); break;
|
|
|
|
|
case LineMode::SMS: fetch(this->template fetch_sms, Clock::TMSMemoryWindow, 0); break;
|
|
|
|
|
case LineMode::Refresh: fetch(this->template fetch_tms_refresh, Clock::TMSMemoryWindow, 0); break;
|
2023-01-23 03:00:28 +00:00
|
|
|
|
|
2023-01-27 02:38:51 +00:00
|
|
|
|
case LineMode::Yamaha:
|
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
|
|
|
|
fetch(this->template fetch_yamaha, Clock::Internal, Storage<personality>::vertical_offset_);
|
|
|
|
|
}
|
|
|
|
|
break;
|
2018-10-03 01:05:30 +00:00
|
|
|
|
}
|
2017-12-14 03:37:27 +00:00
|
|
|
|
|
2018-10-02 03:03:17 +00:00
|
|
|
|
#undef fetch
|
2017-12-14 03:37:27 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
|
|
|
|
// -------------------------------
|
|
|
|
|
// Check for interrupt conditions.
|
|
|
|
|
// -------------------------------
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(this->fetch_pointer_.column < this->mode_timing_.line_interrupt_position && end_column >= this->mode_timing_.line_interrupt_position) {
|
2018-10-14 20:23:45 +00:00
|
|
|
|
// The Sega VDP offers a decrementing counter for triggering line interrupts;
|
|
|
|
|
// it is reloaded either when it overflows or upon every non-pixel line after the first.
|
|
|
|
|
// It is otherwise decremented.
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(this->fetch_pointer_.row >= 0 && this->fetch_pointer_.row <= this->mode_timing_.pixel_lines) {
|
2023-01-19 20:09:16 +00:00
|
|
|
|
--this->line_interrupt_counter_;
|
|
|
|
|
if(this->line_interrupt_counter_ == 0xff) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->line_interrupt_pending_ = true;
|
2023-01-19 20:09:16 +00:00
|
|
|
|
this->line_interrupt_counter_ = this->line_interrupt_target_;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
} else {
|
2023-01-19 20:09:16 +00:00
|
|
|
|
this->line_interrupt_counter_ = this->line_interrupt_target_;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// TODO: the V9938 provides line interrupts from direct specification of the target line.
|
|
|
|
|
// So life is easy.
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->fetch_pointer_.row == this->mode_timing_.end_of_frame_interrupt_position.row &&
|
|
|
|
|
this->fetch_pointer_.column < this->mode_timing_.end_of_frame_interrupt_position.column &&
|
2023-01-01 02:47:05 +00:00
|
|
|
|
end_column >= this->mode_timing_.end_of_frame_interrupt_position.column
|
2018-10-14 20:23:45 +00:00
|
|
|
|
) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->status_ |= StatusInterrupt;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// -------------
|
|
|
|
|
// Advance time.
|
|
|
|
|
// -------------
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->fetch_pointer_.column = end_column;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
write_cycles_pool -= write_cycles;
|
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(this->fetch_pointer_.column == Timing<personality>::CyclesPerLine) {
|
|
|
|
|
this->fetch_pointer_.column = 0;
|
|
|
|
|
this->fetch_pointer_.row = (this->fetch_pointer_.row + 1) % this->mode_timing_.total_lines;
|
|
|
|
|
LineBuffer &next_line_buffer = this->line_buffers_[this->fetch_pointer_.row];
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2023-01-07 19:37:06 +00:00
|
|
|
|
// Establish the current screen output mode, which will be captured as a
|
|
|
|
|
// line mode momentarily.
|
2023-01-07 19:34:33 +00:00
|
|
|
|
this->screen_mode_ = this->current_screen_mode();
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
|
|
|
|
// Based on the output mode, pick a line mode.
|
2023-01-07 18:10:51 +00:00
|
|
|
|
next_line_buffer.first_pixel_output_column = Timing<personality>::FirstPixelCycle;
|
|
|
|
|
next_line_buffer.next_border_column = Timing<personality>::CyclesPerLine;
|
2023-01-09 02:31:00 +00:00
|
|
|
|
next_line_buffer.pixel_count = 256;
|
2023-01-25 04:07:29 +00:00
|
|
|
|
next_line_buffer.screen_mode = this->screen_mode_;
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.maximum_visible_sprites = 4;
|
|
|
|
|
switch(this->screen_mode_) {
|
2018-10-14 20:23:45 +00:00
|
|
|
|
case ScreenMode::Text:
|
2023-01-08 18:58:12 +00:00
|
|
|
|
next_line_buffer.line_mode = LineMode::Text;
|
|
|
|
|
next_line_buffer.first_pixel_output_column = Timing<personality>::FirstTextCycle;
|
|
|
|
|
next_line_buffer.next_border_column = Timing<personality>::LastTextCycle;
|
2023-01-09 02:31:00 +00:00
|
|
|
|
next_line_buffer.pixel_count = 240;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
break;
|
|
|
|
|
case ScreenMode::SMSMode4:
|
2018-10-14 22:19:11 +00:00
|
|
|
|
next_line_buffer.line_mode = LineMode::SMS;
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->mode_timing_.maximum_visible_sprites = 8;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
break;
|
2023-01-21 19:35:26 +00:00
|
|
|
|
case ScreenMode::YamahaGraphics3:
|
|
|
|
|
case ScreenMode::YamahaGraphics4:
|
2023-01-25 04:07:29 +00:00
|
|
|
|
case ScreenMode::YamahaGraphics7:
|
|
|
|
|
next_line_buffer.line_mode = LineMode::Yamaha;
|
|
|
|
|
this->mode_timing_.maximum_visible_sprites = 8;
|
|
|
|
|
break;
|
2023-01-21 19:35:26 +00:00
|
|
|
|
case ScreenMode::YamahaGraphics5:
|
|
|
|
|
case ScreenMode::YamahaGraphics6:
|
2023-01-25 04:07:29 +00:00
|
|
|
|
next_line_buffer.pixel_count = 512;
|
2023-01-23 03:00:28 +00:00
|
|
|
|
next_line_buffer.line_mode = LineMode::Yamaha;
|
2023-01-25 04:07:29 +00:00
|
|
|
|
this->mode_timing_.maximum_visible_sprites = 8;
|
2023-01-21 19:35:26 +00:00
|
|
|
|
break;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
default:
|
2023-01-21 19:35:26 +00:00
|
|
|
|
// This covers both MultiColour and Graphics modes.
|
2018-10-14 22:19:11 +00:00
|
|
|
|
next_line_buffer.line_mode = LineMode::Character;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-23 03:11:01 +00:00
|
|
|
|
const bool is_refresh =
|
2023-01-24 03:25:56 +00:00
|
|
|
|
this->screen_mode_ == ScreenMode::Blank ||
|
2023-01-23 03:11:01 +00:00
|
|
|
|
this->is_vertical_blank();
|
2023-01-23 03:00:28 +00:00
|
|
|
|
|
|
|
|
|
// TODO: an actual sprites-enabled flag.
|
2023-01-23 03:11:01 +00:00
|
|
|
|
Storage<personality>::begin_line(this->screen_mode_, is_refresh, false);
|
|
|
|
|
|
|
|
|
|
if(is_refresh) {
|
|
|
|
|
// The Yamaha handles refresh lines via its own microprogram; other VDPs
|
|
|
|
|
// can fall back on the regular refresh mechanic.
|
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
|
|
|
|
next_line_buffer.line_mode = LineMode::Yamaha;
|
|
|
|
|
} else {
|
|
|
|
|
next_line_buffer.line_mode = LineMode::Refresh;
|
|
|
|
|
}
|
|
|
|
|
}
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2020-09-16 22:15:57 +00:00
|
|
|
|
#ifndef NDEBUG
|
2023-01-21 01:29:15 +00:00
|
|
|
|
assert(backup.row == this->output_pointer_.row && backup.column == this->output_pointer_.column);
|
|
|
|
|
backup = this->fetch_pointer_;
|
2020-09-16 22:15:57 +00:00
|
|
|
|
#endif
|
2018-10-14 22:19:11 +00:00
|
|
|
|
|
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
if(read_cycles_pool) {
|
|
|
|
|
// Determine how much time has passed in the remainder of this line, and proceed.
|
2023-01-01 19:20:45 +00:00
|
|
|
|
const int target_read_cycles = std::min(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
Timing<personality>::CyclesPerLine - this->output_pointer_.column,
|
2023-01-01 19:20:45 +00:00
|
|
|
|
read_cycles_pool
|
|
|
|
|
);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
int read_cycles_performed = 0;
|
|
|
|
|
uint32_t next_cram_value = 0;
|
|
|
|
|
|
|
|
|
|
while(read_cycles_performed < target_read_cycles) {
|
2023-01-01 19:20:45 +00:00
|
|
|
|
int read_cycles = target_read_cycles - read_cycles_performed;
|
|
|
|
|
if(!read_cycles) continue;
|
|
|
|
|
|
2023-01-07 19:57:32 +00:00
|
|
|
|
// Grab the next CRAM dot value and schedule a break in output if applicable.
|
2018-10-26 23:26:46 +00:00
|
|
|
|
const uint32_t cram_value = next_cram_value;
|
2023-01-01 19:20:45 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2023-01-07 19:57:32 +00:00
|
|
|
|
next_cram_value = 0;
|
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(!this->upcoming_cram_dots_.empty() && this->upcoming_cram_dots_.front().location.row == this->output_pointer_.row) {
|
|
|
|
|
int time_until_dot = this->upcoming_cram_dots_.front().location.column - this->output_pointer_.column;
|
2018-10-26 23:26:46 +00:00
|
|
|
|
|
2023-01-01 19:20:45 +00:00
|
|
|
|
if(time_until_dot < read_cycles) {
|
|
|
|
|
read_cycles = time_until_dot;
|
|
|
|
|
next_cram_value = this->upcoming_cram_dots_.front().value;
|
|
|
|
|
this->upcoming_cram_dots_.erase(this->upcoming_cram_dots_.begin());
|
|
|
|
|
}
|
2018-10-26 23:26:46 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
read_cycles_performed += read_cycles;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
const int end_column = this->output_pointer_.column + read_cycles;
|
|
|
|
|
LineBuffer &line_buffer = this->line_buffers_[this->output_pointer_.row];
|
2018-10-26 03:12:03 +00:00
|
|
|
|
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// --------------------
|
|
|
|
|
// Output video stream.
|
|
|
|
|
// --------------------
|
2017-12-03 03:13:43 +00:00
|
|
|
|
|
2023-01-10 03:34:56 +00:00
|
|
|
|
#define crt_convert(action, time) this->crt_.action(from_internal<personality, Clock::CRT>(time))
|
2023-01-08 19:10:06 +00:00
|
|
|
|
#define output_sync(x) crt_convert(output_sync, x)
|
|
|
|
|
#define output_blank(x) crt_convert(output_blank, x)
|
|
|
|
|
#define output_default_colour_burst(x) crt_convert(output_default_colour_burst, x)
|
|
|
|
|
|
2019-12-22 05:00:23 +00:00
|
|
|
|
#define intersect(left, right, code) { \
|
2023-01-21 01:29:15 +00:00
|
|
|
|
const int start = std::max(this->output_pointer_.column, left); \
|
2018-10-03 01:18:28 +00:00
|
|
|
|
const int end = std::min(end_column, right); \
|
|
|
|
|
if(end > start) {\
|
|
|
|
|
code;\
|
|
|
|
|
}\
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
#define border(left, right) intersect(left, right, this->output_border(end - start, cram_value))
|
2018-10-26 23:26:46 +00:00
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
if(line_buffer.line_mode == LineMode::Refresh || this->output_pointer_.row > this->mode_timing_.pixel_lines) {
|
2023-01-07 19:57:32 +00:00
|
|
|
|
if(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->output_pointer_.row >= this->mode_timing_.first_vsync_line &&
|
|
|
|
|
this->output_pointer_.row < this->mode_timing_.first_vsync_line + 4
|
2023-01-07 19:57:32 +00:00
|
|
|
|
) {
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Vertical sync.
|
2023-01-25 04:07:29 +00:00
|
|
|
|
// TODO: the Yamaha and Mega Drive both support interlaced video.
|
2023-01-07 19:57:32 +00:00
|
|
|
|
if(end_column == Timing<personality>::CyclesPerLine) {
|
2023-01-08 19:10:06 +00:00
|
|
|
|
output_sync(Timing<personality>::CyclesPerLine);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
// Right border.
|
2023-01-07 19:57:32 +00:00
|
|
|
|
border(0, Timing<personality>::EndOfRightBorder);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
|
2023-01-08 19:10:06 +00:00
|
|
|
|
// Blanking region: output the entire sequence when the cursor
|
|
|
|
|
// crosses the start-of-border point.
|
|
|
|
|
if(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
|
2023-01-08 19:10:06 +00:00
|
|
|
|
end_column >= Timing<personality>::StartOfLeftBorder
|
|
|
|
|
) {
|
|
|
|
|
output_blank(Timing<personality>::StartOfSync - Timing<personality>::EndOfRightBorder);
|
|
|
|
|
output_sync(Timing<personality>::EndOfSync - Timing<personality>::StartOfSync);
|
|
|
|
|
output_blank(Timing<personality>::StartOfColourBurst - Timing<personality>::EndOfSync);
|
|
|
|
|
output_default_colour_burst(Timing<personality>::EndOfColourBurst - Timing<personality>::StartOfColourBurst);
|
|
|
|
|
output_blank(Timing<personality>::StartOfLeftBorder - Timing<personality>::EndOfColourBurst);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
}
|
2018-10-26 03:12:03 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Border colour for the rest of the line.
|
2023-01-08 19:10:06 +00:00
|
|
|
|
border(Timing<personality>::StartOfLeftBorder, Timing<personality>::CyclesPerLine);
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
// Right border.
|
2023-01-08 19:10:06 +00:00
|
|
|
|
border(0, Timing<personality>::EndOfRightBorder);
|
2018-10-14 20:23:45 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Blanking region.
|
2023-01-08 19:10:06 +00:00
|
|
|
|
if(
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
|
2023-01-08 19:10:06 +00:00
|
|
|
|
end_column >= Timing<personality>::StartOfLeftBorder
|
|
|
|
|
) {
|
|
|
|
|
output_blank(Timing<personality>::StartOfSync - Timing<personality>::EndOfRightBorder);
|
|
|
|
|
output_sync(Timing<personality>::EndOfSync - Timing<personality>::StartOfSync);
|
|
|
|
|
output_blank(Timing<personality>::StartOfColourBurst - Timing<personality>::EndOfSync);
|
|
|
|
|
output_default_colour_burst(Timing<personality>::EndOfColourBurst - Timing<personality>::StartOfColourBurst);
|
|
|
|
|
output_blank(Timing<personality>::StartOfLeftBorder - Timing<personality>::EndOfColourBurst);
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Left border.
|
2023-01-08 19:10:06 +00:00
|
|
|
|
border(Timing<personality>::StartOfLeftBorder, line_buffer.first_pixel_output_column);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
|
2023-01-10 03:34:56 +00:00
|
|
|
|
#define draw(function, clock) { \
|
|
|
|
|
const int relative_start = from_internal<personality, clock>(start - line_buffer.first_pixel_output_column); \
|
|
|
|
|
const int relative_end = from_internal<personality, clock>(end - line_buffer.first_pixel_output_column); \
|
2023-01-08 22:31:08 +00:00
|
|
|
|
if(relative_start == relative_end) break; \
|
|
|
|
|
this->function; }
|
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Pixel region.
|
|
|
|
|
intersect(
|
|
|
|
|
line_buffer.first_pixel_output_column,
|
|
|
|
|
line_buffer.next_border_column,
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(!this->asked_for_write_area_) {
|
|
|
|
|
this->asked_for_write_area_ = true;
|
2023-01-09 02:25:22 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->pixel_origin_ = this->pixel_target_ = reinterpret_cast<uint32_t *>(
|
2023-01-09 02:31:00 +00:00
|
|
|
|
this->crt_.begin_data(line_buffer.pixel_count)
|
2018-10-26 23:26:46 +00:00
|
|
|
|
);
|
|
|
|
|
}
|
2018-03-03 04:08:01 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(this->pixel_target_) {
|
2023-01-25 04:07:29 +00:00
|
|
|
|
// TODO: this dispatch, and the fetch, should be factored into a templatised place, probably.
|
2018-10-26 23:26:46 +00:00
|
|
|
|
switch(line_buffer.line_mode) {
|
2023-01-10 03:34:56 +00:00
|
|
|
|
case LineMode::SMS: draw(draw_sms(relative_start, relative_end, cram_value), Clock::TMSPixel); break;
|
|
|
|
|
case LineMode::Character: draw(draw_tms_character(relative_start, relative_end), Clock::TMSPixel); break;
|
|
|
|
|
case LineMode::Text: draw(draw_tms_text(relative_start, relative_end), Clock::TMSPixel); break;
|
2023-01-25 04:07:29 +00:00
|
|
|
|
case LineMode::Yamaha: draw(draw_yamaha(relative_start, relative_end), Clock::Internal); break;
|
2023-01-21 19:35:26 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
case LineMode::Refresh: break; /* Dealt with elsewhere. */
|
|
|
|
|
}
|
|
|
|
|
}
|
2017-12-01 03:19:53 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
if(end == line_buffer.next_border_column) {
|
2023-01-09 02:31:00 +00:00
|
|
|
|
const int length = line_buffer.next_border_column - line_buffer.first_pixel_output_column;
|
2023-01-10 03:34:56 +00:00
|
|
|
|
this->crt_.output_data(from_internal<personality, Clock::CRT>(length), line_buffer.pixel_count);
|
2023-01-01 02:47:05 +00:00
|
|
|
|
this->pixel_origin_ = this->pixel_target_ = nullptr;
|
|
|
|
|
this->asked_for_write_area_ = false;
|
2018-10-14 20:23:45 +00:00
|
|
|
|
}
|
2018-10-26 23:26:46 +00:00
|
|
|
|
);
|
2017-12-02 22:48:31 +00:00
|
|
|
|
|
2023-01-08 22:31:08 +00:00
|
|
|
|
#undef draw
|
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// Additional right border, if called for.
|
2023-01-08 19:10:06 +00:00
|
|
|
|
if(line_buffer.next_border_column != Timing<personality>::CyclesPerLine) {
|
|
|
|
|
border(line_buffer.next_border_column, Timing<personality>::CyclesPerLine);
|
2018-10-10 00:51:09 +00:00
|
|
|
|
}
|
2018-10-05 02:50:35 +00:00
|
|
|
|
}
|
2018-10-10 00:51:09 +00:00
|
|
|
|
|
2018-10-26 03:12:03 +00:00
|
|
|
|
#undef border
|
|
|
|
|
#undef intersect
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2023-01-08 19:10:06 +00:00
|
|
|
|
#undef crt_convert
|
|
|
|
|
#undef output_sync
|
|
|
|
|
#undef output_blank
|
|
|
|
|
#undef output_default_colour_burst
|
|
|
|
|
|
2018-10-11 01:07:39 +00:00
|
|
|
|
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
// -------------
|
|
|
|
|
// Advance time.
|
|
|
|
|
// -------------
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->output_pointer_.column = end_column;
|
2018-10-26 23:26:46 +00:00
|
|
|
|
}
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2018-10-26 23:26:46 +00:00
|
|
|
|
read_cycles_pool -= target_read_cycles;
|
2023-01-21 01:29:15 +00:00
|
|
|
|
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;
|
2017-11-29 02:10:30 +00:00
|
|
|
|
}
|
2017-11-28 00:43:33 +00:00
|
|
|
|
}
|
2018-10-14 22:19:11 +00:00
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
assert(backup.row == this->fetch_pointer_.row && backup.column == this->fetch_pointer_.column);
|
2017-11-28 00:43:33 +00:00
|
|
|
|
}
|
2017-11-26 18:28:26 +00:00
|
|
|
|
}
|
2017-11-26 21:47:59 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-08 22:04:19 +00:00
|
|
|
|
void Base<personality>::output_border(int cycles, [[maybe_unused]] uint32_t cram_dot) {
|
2023-01-10 03:34:56 +00:00
|
|
|
|
cycles = from_internal<personality, Clock::CRT>(cycles);
|
2018-10-26 23:26:46 +00:00
|
|
|
|
|
2023-01-19 19:09:31 +00:00
|
|
|
|
uint32_t border_colour;
|
2023-01-08 22:04:19 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2023-01-19 19:09:31 +00:00
|
|
|
|
border_colour = Storage<personality>::colour_ram_[16 + background_colour_];
|
|
|
|
|
|
2023-01-08 22:04:19 +00:00
|
|
|
|
if(cram_dot) {
|
2018-11-17 23:23:42 +00:00
|
|
|
|
uint32_t *const pixel_target = reinterpret_cast<uint32_t *>(crt_.begin_data(1));
|
|
|
|
|
if(pixel_target) {
|
2023-01-08 22:04:19 +00:00
|
|
|
|
*pixel_target = border_colour | cram_dot;
|
2018-11-17 23:23:42 +00:00
|
|
|
|
}
|
2023-01-08 22:04:19 +00:00
|
|
|
|
|
|
|
|
|
// 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;
|
|
|
|
|
}
|
2023-01-19 19:09:31 +00:00
|
|
|
|
} else {
|
|
|
|
|
border_colour = palette[background_colour_];
|
2023-01-08 22:04:19 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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;
|
2018-11-15 03:32:33 +00:00
|
|
|
|
}
|
2023-01-08 22:04:19 +00:00
|
|
|
|
crt_.output_level(cycles);
|
|
|
|
|
} else {
|
|
|
|
|
crt_.output_blank(cycles);
|
2018-10-02 03:03:17 +00:00
|
|
|
|
}
|
2017-11-28 03:05:40 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
// MARK: - External interface.
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-21 03:29:49 +00:00
|
|
|
|
int Base<personality>::masked_address(int address) const {
|
2023-01-18 17:36:57 +00:00
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
|
|
|
|
return address & 3;
|
|
|
|
|
} else {
|
|
|
|
|
return address & 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
2017-12-14 03:37:27 +00:00
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void Base<personality>::write_vram(uint8_t value) {
|
|
|
|
|
// Latch the value and exit.
|
2023-01-19 17:32:42 +00:00
|
|
|
|
write_phase_ = false;
|
2017-12-14 03:37:27 +00:00
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
// Enqueue the write to occur at the next available slot.
|
2023-01-19 17:32:42 +00:00
|
|
|
|
read_ahead_buffer_ = value;
|
|
|
|
|
queued_access_ = MemoryAccess::Write;
|
|
|
|
|
cycles_until_access_ = Timing<personality>::VRAMAccessDelay;
|
2023-01-18 17:36:57 +00:00
|
|
|
|
}
|
2017-11-27 01:01:11 +00:00
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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;
|
|
|
|
|
}
|
2018-10-11 01:59:08 +00:00
|
|
|
|
|
2023-01-21 19:12:46 +00:00
|
|
|
|
//
|
|
|
|
|
// Generic TMS functionality.
|
|
|
|
|
//
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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:
|
2023-01-22 01:45:23 +00:00
|
|
|
|
colour_table_address_ =
|
|
|
|
|
(colour_table_address_ & ~0x3fc0) |
|
|
|
|
|
(value << 6) |
|
|
|
|
|
0x3f;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 4:
|
|
|
|
|
pattern_generator_table_address_ = size_t((value & 0x07) << 11) | 0x7ff;
|
2023-01-22 01:45:23 +00:00
|
|
|
|
// TODO: don't mask off so many bits for, at least, the Yamahas.
|
2023-01-21 04:14:57 +00:00
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 5:
|
2023-01-22 01:45:23 +00:00
|
|
|
|
sprite_attribute_table_address_ =
|
|
|
|
|
(sprite_attribute_table_address_ & ~0x3d80) |
|
|
|
|
|
((value << 7) & 0x3f80) |
|
|
|
|
|
0x7f;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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;
|
2017-11-27 01:01:11 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-21 19:12:46 +00:00
|
|
|
|
//
|
|
|
|
|
// Sega extensions.
|
|
|
|
|
//
|
2023-01-21 04:14:57 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
|
|
|
|
switch(reg) {
|
|
|
|
|
default: break;
|
2018-10-11 01:47:48 +00:00
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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;
|
2018-09-23 19:58:23 +00:00
|
|
|
|
}
|
2023-01-21 04:14:57 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-21 19:12:46 +00:00
|
|
|
|
//
|
|
|
|
|
// Yamaha extensions.
|
|
|
|
|
//
|
2023-01-21 04:14:57 +00:00
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
|
|
|
|
switch(reg) {
|
|
|
|
|
default: break;
|
2018-09-23 19:58:23 +00:00
|
|
|
|
|
2017-11-27 01:01:11 +00:00
|
|
|
|
case 0:
|
2023-01-21 19:35:26 +00:00
|
|
|
|
Storage<personality>::mode_ = uint8_t(
|
|
|
|
|
(Storage<personality>::mode_ & 3) |
|
|
|
|
|
((value & 0xe) << 1)
|
|
|
|
|
);
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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
|
2023-01-21 19:48:55 +00:00
|
|
|
|
|
|
|
|
|
LOG("Screen mode: " << int(current_screen_mode()));
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 19:35:26 +00:00
|
|
|
|
case 1:
|
|
|
|
|
Storage<personality>::mode_ = uint8_t(
|
|
|
|
|
(Storage<personality>::mode_ & 0x1c) |
|
|
|
|
|
((value & 0x10) >> 4) |
|
|
|
|
|
((value & 0x08) >> 2)
|
|
|
|
|
);
|
2023-01-21 19:48:55 +00:00
|
|
|
|
|
|
|
|
|
LOG("Screen mode: " << int(current_screen_mode()));
|
2023-01-21 19:35:26 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 10:
|
2023-01-22 01:45:23 +00:00
|
|
|
|
colour_table_address_ =
|
|
|
|
|
(colour_table_address_ & ~0x1c000) |
|
|
|
|
|
((value << 14) & 0x1c000);
|
2023-01-21 04:14:57 +00:00
|
|
|
|
// b0–b2: A14–A16 of the colour table.
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 11:
|
2023-01-22 01:45:23 +00:00
|
|
|
|
sprite_attribute_table_address_ =
|
|
|
|
|
(sprite_attribute_table_address_ & ~0x18000) |
|
|
|
|
|
((value << 15) & 0x18000);
|
2023-01-21 04:14:57 +00:00
|
|
|
|
// b0–b1: A15–A16 of the sprite table.
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 12:
|
|
|
|
|
LOG("TODO: Yamaha text and background blink colour; " << PADHEX(2) << +value);
|
|
|
|
|
// as per register 7, but in blink mode.
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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.
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 14:
|
2023-01-22 01:45:23 +00:00
|
|
|
|
ram_pointer_ = (ram_pointer_ & ~0x1c000) | ((value << 14) & 0x1c000);
|
2017-11-27 01:01:11 +00:00
|
|
|
|
break;
|
2018-09-29 02:37:10 +00:00
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 15:
|
|
|
|
|
Storage<personality>::selected_status_ = value & 0xf;
|
|
|
|
|
break;
|
2023-01-21 04:00:33 +00:00
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
case 16:
|
2023-01-21 19:12:46 +00:00
|
|
|
|
Storage<personality>::palette_entry_ = value;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
// b0–b3: palette entry for writing on port 2; autoincrements upon every write.
|
|
|
|
|
break;
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2023-01-21 04:14:57 +00:00
|
|
|
|
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:
|
2023-01-27 02:38:51 +00:00
|
|
|
|
Storage<personality>::vertical_offset_ = value;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
break;
|
|
|
|
|
|
2023-01-27 00:51:56 +00:00
|
|
|
|
case 32: Storage<personality>::command_context_.source.template set<0, false>(value); break;
|
|
|
|
|
case 33: Storage<personality>::command_context_.source.template set<0, true>(value); break;
|
|
|
|
|
case 34: Storage<personality>::command_context_.source.template set<1, false>(value); break;
|
|
|
|
|
case 35: Storage<personality>::command_context_.source.template set<1, true>(value); break;
|
|
|
|
|
|
|
|
|
|
case 36: Storage<personality>::command_context_.destination.template set<0, false>(value); break;
|
|
|
|
|
case 37: Storage<personality>::command_context_.destination.template set<0, true>(value); break;
|
|
|
|
|
case 38: Storage<personality>::command_context_.destination.template set<1, false>(value); break;
|
|
|
|
|
case 39: Storage<personality>::command_context_.destination.template set<1, true>(value); break;
|
|
|
|
|
|
|
|
|
|
case 40: Storage<personality>::command_context_.size.template set<0, false>(value); break;
|
|
|
|
|
case 41: Storage<personality>::command_context_.size.template set<0, true>(value); break;
|
|
|
|
|
case 42: Storage<personality>::command_context_.size.template set<1, false>(value); break;
|
|
|
|
|
case 43: Storage<personality>::command_context_.size.template set<1, true>(value); break;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
|
|
|
|
|
case 44:
|
2023-01-26 16:59:27 +00:00
|
|
|
|
Storage<personality>::command_context_.colour = value;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 45:
|
2023-01-26 16:59:27 +00:00
|
|
|
|
Storage<personality>::command_context_.arguments = value;
|
2023-01-22 03:33:26 +00:00
|
|
|
|
// b6: 0 = video RAM; 1 = expansion RAM.
|
2023-01-21 04:14:57 +00:00
|
|
|
|
// 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 (???)
|
2023-01-26 17:09:06 +00:00
|
|
|
|
|
|
|
|
|
switch(value >> 4) {
|
|
|
|
|
// All codes not listed below are invalid; just abandon
|
|
|
|
|
// whatever's going on, if anything.
|
|
|
|
|
default: Storage<personality>::command_ = nullptr;
|
|
|
|
|
|
|
|
|
|
case 0b0000: break; // TODO: stop.
|
2023-01-27 02:52:41 +00:00
|
|
|
|
case 0b0100:
|
|
|
|
|
Storage<personality>::command_ = std::make_unique<Commands::Point>(Storage<personality>::command_context_);
|
|
|
|
|
break;
|
2023-01-26 17:09:06 +00:00
|
|
|
|
case 0b0101: break; // TODO: pset.
|
|
|
|
|
case 0b0110: break; // TODO: srch.
|
|
|
|
|
case 0b0111:
|
|
|
|
|
Storage<personality>::command_ = std::make_unique<Commands::Line>(Storage<personality>::command_context_);
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case 0b1000: break; // TODO: lmmv.
|
|
|
|
|
case 0b1001: break; // TODO: lmmm.
|
|
|
|
|
case 0b1010: break; // TODO: lmcm.
|
|
|
|
|
case 0b1011: break; // TODO: lmmc.
|
|
|
|
|
|
|
|
|
|
case 0b1100: break; // TODO: hmmv.
|
|
|
|
|
case 0b1101: break; // TODO: hmmm.
|
|
|
|
|
case 0b1110: break; // TODO: ymmm.
|
|
|
|
|
case 0b1111: break; // TODO: hmmc.
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-26 17:55:08 +00:00
|
|
|
|
// Seed timing information if a command was found.
|
|
|
|
|
if(Storage<personality>::command_) {
|
2023-01-27 02:31:49 +00:00
|
|
|
|
// TODO: eliminate SUPER HACK.
|
|
|
|
|
// This is currently here primarily to help me to hash out the
|
|
|
|
|
// proper interface, and also because I'm just not persuaded
|
|
|
|
|
// that minimum_access_column_ works properly. Why doesn't it
|
|
|
|
|
// ever end up out of bounds?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// TODO: undo temporary assumption of Graphics Mode 5.
|
|
|
|
|
uint8_t packed_colour = Storage<personality>::command_context_.colour & 3;
|
|
|
|
|
packed_colour |= packed_colour << 2;
|
|
|
|
|
packed_colour |= packed_colour << 4;
|
|
|
|
|
|
|
|
|
|
while(!Storage<personality>::command_->done()) {
|
|
|
|
|
const int address =
|
|
|
|
|
(Storage<personality>::command_->location.v[0] >> 2) +
|
|
|
|
|
(Storage<personality>::command_->location.v[1] << 7);
|
|
|
|
|
|
|
|
|
|
const uint8_t mask = 0xc0 >> ((Storage<personality>::command_->location.v[0] & 3) << 1);
|
|
|
|
|
uint8_t v = ram_[address];
|
|
|
|
|
v &= ~mask;
|
|
|
|
|
v |= packed_colour & mask;
|
|
|
|
|
ram_[address] = v;
|
|
|
|
|
|
|
|
|
|
Storage<personality>::command_->advance();
|
|
|
|
|
}
|
2023-01-27 02:49:32 +00:00
|
|
|
|
|
|
|
|
|
Storage<personality>::command_ = nullptr;
|
2023-01-26 17:55:08 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-26 17:09:06 +00:00
|
|
|
|
// TODO: record logical mode.
|
2023-01-21 04:14:57 +00:00
|
|
|
|
break;
|
2017-11-27 01:01:11 +00:00
|
|
|
|
}
|
2023-01-21 04:14:57 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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.
|
2023-01-22 01:45:23 +00:00
|
|
|
|
ram_pointer_ = (ram_pointer_ & ~0xff) | low_write_;
|
2023-01-21 04:14:57 +00:00
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// The RAM pointer is always set on a second write, regardless of
|
|
|
|
|
// whether the caller is intending to enqueue a VDP operation.
|
2023-01-22 01:45:23 +00:00
|
|
|
|
ram_pointer_ = (ram_pointer_ & ~0x3f00) | ((value << 8) & 0x3f00);
|
2023-01-21 04:14:57 +00:00
|
|
|
|
|
|
|
|
|
write_phase_ = false;
|
|
|
|
|
if(value & 0x80) {
|
|
|
|
|
commit_register(value, low_write_);
|
2017-11-27 01:01:11 +00:00
|
|
|
|
} else {
|
2018-10-07 22:55:35 +00:00
|
|
|
|
// This is an access via the RAM pointer.
|
2017-11-27 01:01:11 +00:00
|
|
|
|
if(!(value & 0x40)) {
|
2018-10-07 22:55:35 +00:00
|
|
|
|
// A read request is enqueued upon setting the address; conversely a write
|
|
|
|
|
// won't be enqueued unless and until some actual data is supplied.
|
2023-01-19 17:32:42 +00:00
|
|
|
|
queued_access_ = MemoryAccess::Read;
|
|
|
|
|
cycles_until_access_ = Timing<personality>::VRAMAccessDelay;
|
2017-11-27 01:01:11 +00:00
|
|
|
|
}
|
2023-01-19 19:09:31 +00:00
|
|
|
|
|
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
|
|
|
|
Storage<personality>::cram_is_selected_ = false;
|
|
|
|
|
}
|
2017-11-27 01:01:11 +00:00
|
|
|
|
}
|
2017-11-26 21:47:59 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
void Base<personality>::write_palette(uint8_t value) {
|
2023-01-21 19:12:46 +00:00
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
|
|
|
|
if(!write_phase_) {
|
|
|
|
|
Storage<personality>::new_colour_ = value;
|
|
|
|
|
write_phase_ = true;
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
write_phase_ = false;
|
|
|
|
|
|
2023-01-21 19:19:52 +00:00
|
|
|
|
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;
|
2023-01-21 19:12:46 +00:00
|
|
|
|
|
|
|
|
|
Storage<personality>::palette_[Storage<personality>::palette_entry_ & 0xf] = palette_pack(r, g, b);
|
|
|
|
|
++Storage<personality>::palette_entry_;
|
|
|
|
|
}
|
2023-01-18 17:36:57 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <Personality personality>
|
2023-01-21 04:07:14 +00:00
|
|
|
|
void Base<personality>::write_register_indirect([[maybe_unused]] uint8_t value) {
|
|
|
|
|
if constexpr (is_yamaha_vdp(personality)) {
|
2023-01-21 04:14:57 +00:00
|
|
|
|
// Register 17 cannot be written to indirectly.
|
|
|
|
|
if(Storage<personality>::indirect_register_ != 17) {
|
|
|
|
|
commit_register(Storage<personality>::indirect_register_, value);
|
2023-01-21 04:07:14 +00:00
|
|
|
|
}
|
2023-01-21 04:14:57 +00:00
|
|
|
|
Storage<personality>::indirect_register_ += Storage<personality>::increment_indirect_register_;
|
2023-01-21 04:07:14 +00:00
|
|
|
|
}
|
2023-01-18 17:36:57 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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.
|
2023-01-19 17:32:42 +00:00
|
|
|
|
const uint8_t result = read_ahead_buffer_;
|
|
|
|
|
queued_access_ = MemoryAccess::Read;
|
2023-01-18 17:36:57 +00:00
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template <Personality personality>
|
|
|
|
|
uint8_t Base<personality>::read_register() {
|
2023-01-19 03:23:19 +00:00
|
|
|
|
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
|
2023-01-21 03:29:49 +00:00
|
|
|
|
(queued_access_ == MemoryAccess::None ? 0x80 : 0x00) |
|
|
|
|
|
(is_vertical_blank() ? 0x40 : 0x00) |
|
|
|
|
|
(is_horizontal_blank() ? 0x20 : 0x00);
|
2023-01-19 03:23:19 +00:00
|
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-18 17:36:57 +00:00
|
|
|
|
// Gets the status register.
|
2023-01-19 17:32:42 +00:00
|
|
|
|
const uint8_t result = status_;
|
|
|
|
|
status_ &= ~(StatusInterrupt | StatusSpriteOverflow | StatusSpriteCollision);
|
|
|
|
|
line_interrupt_pending_ = false;
|
2023-01-18 17:36:57 +00:00
|
|
|
|
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.
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-21 03:29:49 +00:00
|
|
|
|
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
|
2023-01-21 01:29:15 +00:00
|
|
|
|
(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;
|
2023-01-21 03:29:49 +00:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
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();
|
2018-10-12 01:42:09 +00:00
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(this->tv_standard_ == TVStandard::NTSC) {
|
|
|
|
|
if(this->mode_timing_.pixel_lines == 240) {
|
2018-10-20 02:37:56 +00:00
|
|
|
|
// NTSC 256x240: 00-FF, 00-06
|
2023-01-01 02:47:05 +00:00
|
|
|
|
} else if(this->mode_timing_.pixel_lines == 224) {
|
2018-10-20 02:37:56 +00:00
|
|
|
|
// 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 {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(this->mode_timing_.pixel_lines == 240) {
|
2018-10-20 02:37:56 +00:00
|
|
|
|
// PAL 256x240: 00-FF, 00-0A, D2-FF
|
|
|
|
|
if(source_row >= 267) source_row -= 0x39;
|
2023-01-01 02:47:05 +00:00
|
|
|
|
} else if(this->mode_timing_.pixel_lines == 224) {
|
2018-10-20 02:37:56 +00:00
|
|
|
|
// 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;
|
|
|
|
|
}
|
|
|
|
|
}
|
2018-10-12 01:42:09 +00:00
|
|
|
|
|
2020-05-10 03:00:39 +00:00
|
|
|
|
return uint8_t(source_row);
|
2018-10-11 23:56:32 +00:00
|
|
|
|
}
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-01 18:49:11 +00:00
|
|
|
|
HalfCycles TMS9918<personality>::get_next_sequence_point() const {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(!this->generate_interrupts_ && !this->enable_line_interrupts_) return HalfCycles::max();
|
2021-04-06 01:02:37 +00:00
|
|
|
|
if(get_interrupt_line()) return HalfCycles::max();
|
2017-11-30 01:31:55 +00:00
|
|
|
|
|
2018-10-05 02:50:35 +00:00
|
|
|
|
// Calculate the amount of time until the next end-of-frame interrupt.
|
2023-01-07 14:13:34 +00:00
|
|
|
|
const int frame_length = Timing<personality>::CyclesPerLine * this->mode_timing_.total_lines;
|
2018-10-21 22:42:49 +00:00
|
|
|
|
int time_until_frame_interrupt =
|
2018-10-11 01:07:39 +00:00
|
|
|
|
(
|
2023-01-07 14:13:34 +00:00
|
|
|
|
((this->mode_timing_.end_of_frame_interrupt_position.row * Timing<personality>::CyclesPerLine) + this->mode_timing_.end_of_frame_interrupt_position.column + frame_length) -
|
2023-01-21 01:29:15 +00:00
|
|
|
|
((this->fetch_pointer_.row * Timing<personality>::CyclesPerLine) + this->fetch_pointer_.column)
|
2018-10-11 01:07:39 +00:00
|
|
|
|
) % frame_length;
|
2018-10-21 22:42:49 +00:00
|
|
|
|
if(!time_until_frame_interrupt) time_until_frame_interrupt = frame_length;
|
2018-10-11 01:07:39 +00:00
|
|
|
|
|
2023-01-09 02:25:22 +00:00
|
|
|
|
if(!this->enable_line_interrupts_) {
|
|
|
|
|
return this->clock_converter_.half_cycles_before_internal_cycles(time_until_frame_interrupt);
|
|
|
|
|
}
|
2018-10-10 00:51:09 +00:00
|
|
|
|
|
2018-10-21 22:42:49 +00:00
|
|
|
|
// Calculate when the next line interrupt will occur.
|
2018-10-10 00:51:09 +00:00
|
|
|
|
int next_line_interrupt_row = -1;
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
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;
|
2018-10-21 22:42:49 +00:00
|
|
|
|
if(cycles_to_next_interrupt_threshold <= 0) {
|
2023-01-07 14:13:34 +00:00
|
|
|
|
cycles_to_next_interrupt_threshold += Timing<personality>::CyclesPerLine;
|
2018-10-21 22:42:49 +00:00
|
|
|
|
++line_of_next_interrupt_threshold;
|
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if constexpr (is_sega_vdp(personality)) {
|
2018-10-10 00:51:09 +00:00
|
|
|
|
// 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.
|
2023-01-19 20:09:16 +00:00
|
|
|
|
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_;
|
2018-10-10 00:51:09 +00:00
|
|
|
|
} else {
|
2023-01-19 20:09:16 +00:00
|
|
|
|
if(this->line_interrupt_target_ <= this->mode_timing_.pixel_lines)
|
|
|
|
|
next_line_interrupt_row = this->mode_timing_.total_lines + this->line_interrupt_target_;
|
2018-10-10 00:51:09 +00:00
|
|
|
|
}
|
2018-10-05 02:50:35 +00:00
|
|
|
|
}
|
|
|
|
|
|
2018-10-10 00:51:09 +00:00
|
|
|
|
// 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) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
return this->generate_interrupts_ ?
|
2023-01-01 19:20:45 +00:00
|
|
|
|
this->clock_converter_.half_cycles_before_internal_cycles(time_until_frame_interrupt) :
|
2021-06-05 02:38:07 +00:00
|
|
|
|
HalfCycles::max();
|
2018-10-05 02:50:35 +00:00
|
|
|
|
}
|
|
|
|
|
|
2018-10-10 02:14:35 +00:00
|
|
|
|
// 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.
|
2023-01-07 14:13:34 +00:00
|
|
|
|
const int local_cycles_until_line_interrupt = cycles_to_next_interrupt_threshold + (next_line_interrupt_row - line_of_next_interrupt_threshold) * Timing<personality>::CyclesPerLine;
|
2023-01-01 19:20:45 +00:00
|
|
|
|
if(!this->generate_interrupts_) return this->clock_converter_.half_cycles_before_internal_cycles(local_cycles_until_line_interrupt);
|
2018-10-05 02:50:35 +00:00
|
|
|
|
|
2018-10-10 00:51:09 +00:00
|
|
|
|
// Return whichever interrupt is closer.
|
2023-01-01 19:20:45 +00:00
|
|
|
|
return this->clock_converter_.half_cycles_before_internal_cycles(std::min(local_cycles_until_line_interrupt, time_until_frame_interrupt));
|
2017-11-30 01:31:55 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
|
|
|
|
HalfCycles TMS9918<personality>::get_time_until_line(int line) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
if(line < 0) line += this->mode_timing_.total_lines;
|
2018-10-25 01:59:30 +00:00
|
|
|
|
|
2023-01-21 01:29:15 +00:00
|
|
|
|
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;
|
2018-10-25 01:59:30 +00:00
|
|
|
|
if(cycles_to_next_interrupt_threshold <= 0) {
|
2023-01-07 14:13:34 +00:00
|
|
|
|
cycles_to_next_interrupt_threshold += Timing<personality>::CyclesPerLine;
|
2018-10-25 01:59:30 +00:00
|
|
|
|
++line_of_next_interrupt_threshold;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if(line_of_next_interrupt_threshold > line) {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
line += this->mode_timing_.total_lines;
|
2018-10-25 01:59:30 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-07 14:13:34 +00:00
|
|
|
|
return this->clock_converter_.half_cycles_before_internal_cycles(cycles_to_next_interrupt_threshold + (line - line_of_next_interrupt_threshold)*Timing<personality>::CyclesPerLine);
|
2018-10-25 01:59:30 +00:00
|
|
|
|
}
|
|
|
|
|
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-01 18:49:11 +00:00
|
|
|
|
bool TMS9918<personality>::get_interrupt_line() const {
|
2023-01-01 02:47:05 +00:00
|
|
|
|
return
|
|
|
|
|
((this->status_ & StatusInterrupt) && this->generate_interrupts_) ||
|
|
|
|
|
(this->enable_line_interrupts_ && this->line_interrupt_pending_);
|
2017-11-30 01:31:55 +00:00
|
|
|
|
}
|
2018-10-03 01:05:30 +00:00
|
|
|
|
|
2023-01-05 18:18:10 +00:00
|
|
|
|
// TODO: [potentially] remove Master System timing assumptions in latch and get_latched below.
|
2023-01-07 14:10:41 +00:00
|
|
|
|
template <Personality personality>uint8_t TMS9918<personality>::get_latched_horizontal_counter() const {
|
2023-01-05 18:18:10 +00:00
|
|
|
|
// Translate from internal numbering, which puts pixel output
|
|
|
|
|
// in the final 256 pixels of 342, to the public numbering,
|
2023-01-07 14:10:41 +00:00
|
|
|
|
// which counts the 256 pixels as items 0–255, starts
|
2023-01-05 18:18:10 +00:00
|
|
|
|
// counting at -48, and returns only the top 8 bits of the number.
|
2023-01-07 14:10:41 +00:00
|
|
|
|
int public_counter = this->latched_column_ - (342 - 256);
|
2023-01-05 18:18:10 +00:00
|
|
|
|
if(public_counter < -46) public_counter += 342;
|
|
|
|
|
return uint8_t(public_counter >> 1);
|
2018-10-03 01:05:30 +00:00
|
|
|
|
}
|
|
|
|
|
|
2023-01-01 02:47:05 +00:00
|
|
|
|
template <Personality personality>
|
2023-01-05 18:18:10 +00:00
|
|
|
|
void TMS9918<personality>::latch_horizontal_counter() {
|
2023-01-21 01:29:15 +00:00
|
|
|
|
this->latched_column_ = this->fetch_pointer_.column;
|
2018-10-03 01:05:30 +00:00
|
|
|
|
}
|
2022-12-31 20:08:33 +00:00
|
|
|
|
|
|
|
|
|
template class TI::TMS::TMS9918<Personality::TMS9918A>;
|
|
|
|
|
template class TI::TMS::TMS9918<Personality::V9938>;
|
2023-01-19 03:23:19 +00:00
|
|
|
|
//template class TI::TMS::TMS9918<Personality::V9958>;
|
2022-12-31 20:08:33 +00:00
|
|
|
|
template class TI::TMS::TMS9918<Personality::SMSVDP>;
|
|
|
|
|
template class TI::TMS::TMS9918<Personality::SMS2VDP>;
|
2023-01-19 19:09:31 +00:00
|
|
|
|
//template class TI::TMS::TMS9918<Personality::GGVDP>;
|
2023-01-19 03:23:19 +00:00
|
|
|
|
//template class TI::TMS::TMS9918<Personality::MDVDP>;
|