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Be overt about buffer target and vertical position.

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This commit is contained in:
Thomas Harte 2023-01-24 12:46:09 -05:00
parent 445b34933a
commit 63bd0f918d
3 changed files with 38 additions and 37 deletions
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10
Components/9918/Implementation/9918.cpp
View File

@ -200,14 +200,18 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
// ------------------------
// Perform memory accesses.
// ------------------------
#define fetch(function, clock) { \
#define fetch(function, clock) { \
const int first_window = from_internal<personality, clock>(this->fetch_pointer_.column);\
const int final_window = from_internal<personality, clock>(end_column); \
if(first_window == final_window) break; \
if(final_window != clock_rate<personality, clock>()) { \
function<true>(first_window, final_window); \
function<true>( \
this->line_buffers_[this->fetch_pointer_.row], this->fetch_pointer_.row, \
first_window, final_window); \
} else { \
function<false>(first_window, final_window); \
function<false>( \
this->line_buffers_[this->fetch_pointer_.row], this->fetch_pointer_.row, \
first_window, final_window); \
} \
}

12
Components/9918/Implementation/9918Base.hpp
View File

@ -642,14 +642,14 @@ template <Personality personality> struct Base: public Storage<personality> {
}
// Various fetchers.
template<bool use_end> void fetch_tms_refresh(int start, int end);
template<bool use_end> void fetch_tms_text(int start, int end);
template<bool use_end> void fetch_tms_character(int start, int end);
template<bool use_end> void fetch_tms_refresh(LineBuffer &, int y, int start, int end);
template<bool use_end> void fetch_tms_text(LineBuffer &, int y, int start, int end);
template<bool use_end> void fetch_tms_character(LineBuffer &, int y, int start, int end);
template<bool use_end> void fetch_yamaha(int start, int end);
template<ScreenMode> void fetch_yamaha(int end);
template<bool use_end> void fetch_yamaha(LineBuffer &, int y, int start, int end);
template<ScreenMode> void fetch_yamaha(LineBuffer &, int y, int end);
template<bool use_end> void fetch_sms(int start, int end);
template<bool use_end> void fetch_sms(LineBuffer &, int y, int start, int end);
// A helper function to output the current border colour for
// the number of cycles supplied.

53
Components/9918/Implementation/Fetch.hpp
View File

@ -73,7 +73,7 @@
// MARK: - TMS9918
template <Personality personality>
template<bool use_end> void Base<personality>::fetch_tms_refresh(int start, int end) {
template<bool use_end> void Base<personality>::fetch_tms_refresh(LineBuffer &, int, int start, int end) {
#define refresh(location) \
slot(location): \
external_slot(location+1);
@ -118,7 +118,7 @@ template<bool use_end> void Base<personality>::fetch_tms_refresh(int start, int
}
template <Personality personality>
template<bool use_end> void Base<personality>::fetch_tms_text(int start, int end) {
template<bool use_end> void Base<personality>::fetch_tms_text(LineBuffer &line_buffer, int y, int start, int end) {
#define fetch_tile_name(location, column) slot(location): line_buffer.names[column].offset = ram_[row_base + column];
#define fetch_tile_pattern(location, column) slot(location): line_buffer.patterns[column][0] = ram_[row_offset + size_t(line_buffer.names[column].offset << 3)];
@ -139,9 +139,8 @@ template<bool use_end> void Base<personality>::fetch_tms_text(int start, int end
fetch_columns_4(location, column); \
fetch_columns_4(location+12, column+4);
LineBuffer &line_buffer = line_buffers_[fetch_pointer_.row];
const size_t row_base = pattern_name_address_ & (0x3c00 | size_t(fetch_pointer_.row >> 3) * 40);
const size_t row_offset = pattern_generator_table_address_ & (0x3800 | (fetch_pointer_.row & 7));
const size_t row_base = pattern_name_address_ & (0x3c00 | size_t(y >> 3) * 40);
const size_t row_offset = pattern_generator_table_address_ & (0x3800 | (y & 7));
switch(start) {
default: assert(false);
@ -176,7 +175,7 @@ template<bool use_end> void Base<personality>::fetch_tms_text(int start, int end
}
template <Personality personality>
template<bool use_end> void Base<personality>::fetch_tms_character(int start, int end) {
template<bool use_end> void Base<personality>::fetch_tms_character(LineBuffer &line_buffer, int y, int start, int end) {
#define sprite_fetch_coordinates(location, sprite) \
slot(location): \
slot(location+1): \
@ -210,7 +209,7 @@ template<bool use_end> void Base<personality>::fetch_tms_character(int start, in
sprite_fetch_graphics(location+2, sprite)
#define sprite_y_read(location, sprite) \
slot(location): posit_sprite(sprite_selection_buffer, sprite, ram_[sprite_attribute_table_address_ & (((sprite) << 2) | 0x3f80)], fetch_pointer_.row);
slot(location): posit_sprite(sprite_selection_buffer, sprite, ram_[sprite_attribute_table_address_ & (((sprite) << 2) | 0x3f80)], y);
#define fetch_tile_name(column) line_buffer.names[column].offset = ram_[(row_base + column) & 0x3fff];
@ -237,9 +236,8 @@ template<bool use_end> void Base<personality>::fetch_tms_character(int start, in
slot(location+14): \
slot(location+15): fetch_tile(column+3)
LineBuffer &line_buffer = line_buffers_[fetch_pointer_.row];
LineBuffer &sprite_selection_buffer = line_buffers_[(fetch_pointer_.row + 1) % mode_timing_.total_lines];
const size_t row_base = pattern_name_address_ & (size_t((fetch_pointer_.row << 2)&~31) | 0x3c00);
LineBuffer &sprite_selection_buffer = line_buffers_[(y + 1) % mode_timing_.total_lines];
const size_t row_base = pattern_name_address_ & (size_t((y << 2)&~31) | 0x3c00);
size_t pattern_base = pattern_generator_table_address_;
size_t colour_base = colour_table_address_;
@ -247,10 +245,10 @@ template<bool use_end> void Base<personality>::fetch_tms_character(int start, in
if(screen_mode_ == ScreenMode::Graphics) {
// If this is high resolution mode, allow the row number to affect the pattern and colour addresses.
pattern_base &= size_t(0x2000 | ((fetch_pointer_.row & 0xc0) << 5));
colour_base &= size_t(0x2000 | ((fetch_pointer_.row & 0xc0) << 5));
pattern_base &= size_t(0x2000 | ((y & 0xc0) << 5));
colour_base &= size_t(0x2000 | ((y & 0xc0) << 5));
colour_base += size_t(fetch_pointer_.row & 7);
colour_base += size_t(y & 7);
colour_name_shift = 0;
} else {
colour_base &= size_t(0xffc0);
@ -258,9 +256,9 @@ template<bool use_end> void Base<personality>::fetch_tms_character(int start, in
}
if(screen_mode_ == ScreenMode::MultiColour) {
pattern_base += size_t((fetch_pointer_.row >> 2) & 7);
pattern_base += size_t((y >> 2) & 7);
} else {
pattern_base += size_t(fetch_pointer_.row & 7);
pattern_base += size_t(y & 7);
}
switch(start) {
@ -318,7 +316,7 @@ template<bool use_end> void Base<personality>::fetch_tms_character(int start, in
// MARK: - Master System
template <Personality personality>
template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
template<bool use_end> void Base<personality>::fetch_sms(LineBuffer &line_buffer, int y, int start, int end) {
if constexpr (is_sega_vdp(personality)) {
#define sprite_fetch(sprite) {\
@ -348,8 +346,8 @@ template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
#define sprite_y_read(location, sprite) \
slot(location): \
posit_sprite(sprite_selection_buffer, sprite, ram_[Storage<personality>::sprite_attribute_table_address_ & ((sprite) | 0x3f00)], fetch_pointer_.row); \
posit_sprite(sprite_selection_buffer, sprite+1, ram_[Storage<personality>::sprite_attribute_table_address_ & ((sprite + 1) | 0x3f00)], fetch_pointer_.row); \
posit_sprite(sprite_selection_buffer, sprite, ram_[Storage<personality>::sprite_attribute_table_address_ & ((sprite) | 0x3f00)], y); \
posit_sprite(sprite_selection_buffer, sprite+1, ram_[Storage<personality>::sprite_attribute_table_address_ & ((sprite + 1) | 0x3f00)], y); \
#define fetch_tile_name(column, row_info) {\
const size_t scrolled_column = (column - horizontal_offset) & 0x1f;\
@ -391,9 +389,8 @@ template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
slot(location+15): fetch_tile(column+3)
// Determine the coarse horizontal scrolling offset; this isn't applied on the first two lines if the programmer has requested it.
LineBuffer &line_buffer = line_buffers_[fetch_pointer_.row];
LineBuffer &sprite_selection_buffer = line_buffers_[(fetch_pointer_.row + 1) % mode_timing_.total_lines];
const int horizontal_offset = (fetch_pointer_.row >= 16 || !Storage<personality>::horizontal_scroll_lock_) ? (line_buffer.latched_horizontal_scroll >> 3) : 0;
LineBuffer &sprite_selection_buffer = line_buffers_[(y + 1) % mode_timing_.total_lines];
const int horizontal_offset = (y >= 16 || !Storage<personality>::horizontal_scroll_lock_) ? (line_buffer.latched_horizontal_scroll >> 3) : 0;
// Limit address bits in use if this is a SMS2 mode.
const bool is_tall_mode = mode_timing_.pixel_lines != 192;
@ -402,7 +399,7 @@ template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
// Determine row info for the screen both (i) if vertical scrolling is applied; and (ii) if it isn't.
// The programmer can opt out of applying vertical scrolling to the right-hand portion of the display.
const int scrolled_row = (fetch_pointer_.row + Storage<personality>::latched_vertical_scroll_) % (is_tall_mode ? 256 : 224);
const int scrolled_row = (y + Storage<personality>::latched_vertical_scroll_) % (is_tall_mode ? 256 : 224);
struct RowInfo {
size_t pattern_address_base;
size_t sub_row[2];
@ -413,9 +410,9 @@ template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
};
RowInfo row_info;
if(Storage<personality>::vertical_scroll_lock_) {
row_info.pattern_address_base = (pattern_name_address & size_t(((fetch_pointer_.row & ~7) << 3) | 0x3800)) - pattern_name_offset;
row_info.sub_row[0] = size_t((fetch_pointer_.row & 7) << 2);
row_info.sub_row[1] = 28 ^ size_t((fetch_pointer_.row & 7) << 2);
row_info.pattern_address_base = (pattern_name_address & size_t(((y & ~7) << 3) | 0x3800)) - pattern_name_offset;
row_info.sub_row[0] = size_t((y & 7) << 2);
row_info.sub_row[1] = 28 ^ size_t((y & 7) << 2);
} else row_info = scrolled_row_info;
// ... and do the actual fetching, which follows this routine:
@ -471,7 +468,7 @@ template<bool use_end> void Base<personality>::fetch_sms(int start, int end) {
// MARK: - Yamaha
template <Personality personality>
template<ScreenMode mode> void Base<personality>::fetch_yamaha(int end) {
template<ScreenMode mode> void Base<personality>::fetch_yamaha([[maybe_unused]] LineBuffer &line_buffer, [[maybe_unused]] int y, int end) {
while(Storage<personality>::next_event_->offset < end) {
switch(Storage<personality>::next_event_->type) {
case Storage<personality>::Event::Type::External:
@ -502,10 +499,10 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(int end) {
template <Personality personality>
template<bool use_end> void Base<personality>::fetch_yamaha([[maybe_unused]] int start, int end) {
template<bool use_end> void Base<personality>::fetch_yamaha(LineBuffer &line_buffer, int y, int, int end) {
if constexpr (is_yamaha_vdp(personality)) {
// Dispatch according to [supported] screen mode.
#define Dispatch(mode) case mode: fetch_yamaha<mode>(end); break;
#define Dispatch(mode) case mode: fetch_yamaha<mode>(line_buffer, y, end); break;
switch(screen_mode_) {
default: break;
Dispatch(ScreenMode::Blank);