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Attempt real blank reporting.

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This commit is contained in:
Thomas Harte 2023-01-20 22:29:49 -05:00
parent 9b7a925816
commit 191cf4829b
2 changed files with 30 additions and 10 deletions
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34
Components/9918/Implementation/9918.cpp
View File

@ -292,7 +292,7 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
if(
(this->screen_mode_ == ScreenMode::Blank) ||
(this->fetch_pointer_.row >= this->mode_timing_.pixel_lines && this->fetch_pointer_.row != this->mode_timing_.total_lines-1))
this->is_vertical_blank())
next_line_buffer.line_mode = LineMode::Refresh;
}
}
@ -521,7 +521,7 @@ void Base<personality>::output_border(int cycles, [[maybe_unused]] uint32_t cram
// MARK: - External interface.
template <Personality personality>
int Base<personality>::masked_address(int address) {
int Base<personality>::masked_address(int address) const {
if constexpr (is_yamaha_vdp(personality)) {
return address & 3;
} else {
@ -728,9 +728,9 @@ uint8_t Base<personality>::read_register() {
// b1 = display field odd/even
// b0 = command ongoing
return
queued_access_ == MemoryAccess::None ? 0x80 : 0x00 |
0x40 |
0x20;
(queued_access_ == MemoryAccess::None ? 0x80 : 0x00) |
(is_vertical_blank() ? 0x40 : 0x00) |
(is_horizontal_blank() ? 0x20 : 0x00);
break;
}
@ -772,13 +772,29 @@ uint8_t TMS9918<personality>::read(int address) {
// MARK: - Ephemeral state.
template <Personality personality>
uint8_t TMS9918<personality>::get_current_line() const {
// Determine the row to return.
constexpr int row_change_position = 63; // This is the proper Master System value; substitute if any other VDPs turn out to have this functionality.
int source_row =
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) {

6
Components/9918/Implementation/9918Base.hpp
View File

@ -302,7 +302,11 @@ template <Personality personality> struct Base: public Storage<personality> {
// with the beginning of writing the next, hence the two separate line buffers.
LineBufferPointer output_pointer_, fetch_pointer_;
int masked_address(int address);
int fetch_line() const;
bool is_vertical_blank() const;
bool is_horizontal_blank() const;
int masked_address(int address) const;
void write_vram(uint8_t);
void write_register(uint8_t);
void write_palette(uint8_t);