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Adjust layout inner loop.

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This commit is contained in:
Thomas Harte 2023-04-23 12:17:55 -04:00
parent f22aa6eb36
commit 96896f838c
2 changed files with 30 additions and 47 deletions
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58
Components/9918/Implementation/9918.cpp
View File

@ -31,6 +31,8 @@ Base<personality>::Base() :
// into whether there's a more natural form. It feels unlikely given the diversity of chips modelled.
if constexpr (is_sega_vdp(personality)) {
// TODO: all these relate to the old line timing; resource and review.
mode_timing_.line_interrupt_position = 64;
mode_timing_.end_of_frame_interrupt_position.column = 63;
@ -39,13 +41,13 @@ Base<personality>::Base() :
if constexpr (is_yamaha_vdp(personality)) {
// TODO: start of sync, or end of sync?
mode_timing_.line_interrupt_position = Timing<personality>::StartOfSync;
mode_timing_.line_interrupt_position = 0;//Timing<personality>::StartOfSync;
}
// Establish that output is delayed after reading by `output_lag` cycles,
// i.e. the fetch pointer is currently _ahead_ of the output pointer.
//
// Start at a random position.
// TODO: Start at a random position.
output_pointer_.row = output_pointer_.column = 0;
// output_pointer_.row = rand() % 262;
// output_pointer_.column = rand() % (Timing<personality>::CyclesPerLine - output_lag);
@ -508,43 +510,40 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
output_sync(Timing<personality>::CyclesPerLine);
}
} else {
// Right border.
border(0, Timing<personality>::EndOfRightBorder);
// Blanking region: output the entire sequence when the cursor
// crosses the start-of-border point.
if(
this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
end_column >= Timing<personality>::StartOfLeftBorder
this->output_pointer_.column < LineLayout<personality>::EndOfLeftErase &&
end_column >= LineLayout<personality>::EndOfLeftErase
) {
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);
output_sync(LineLayout<personality>::EndOfSync);
output_blank(LineLayout<personality>::StartOfColourBurst - LineLayout<personality>::EndOfSync);
output_default_colour_burst(LineLayout<personality>::EndOfColourBurst - LineLayout<personality>::StartOfColourBurst);
output_blank(LineLayout<personality>::EndOfLeftErase - LineLayout<personality>::EndOfColourBurst);
}
// Border colour for the rest of the line.
border(Timing<personality>::StartOfLeftBorder, Timing<personality>::CyclesPerLine);
// Border colour until beginning of right erase.
border(LineLayout<personality>::EndOfLeftErase, LineLayout<personality>::EndOfRightBorder);
// Right erase.
if(this->output_pointer_.column == Timing<personality>::CyclesPerLine) {
output_blank(Timing<personality>::CyclesPerLine - LineLayout<personality>::EndOfRightBorder);
}
}
} else {
// Right border.
border(0, Timing<personality>::EndOfRightBorder);
// Blanking region.
if(
this->output_pointer_.column < Timing<personality>::StartOfLeftBorder &&
end_column >= Timing<personality>::StartOfLeftBorder
this->output_pointer_.column < LineLayout<personality>::EndOfLeftErase &&
end_column >= LineLayout<personality>::EndOfLeftErase
) {
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);
output_sync(LineLayout<personality>::EndOfSync);
output_blank(LineLayout<personality>::StartOfColourBurst - LineLayout<personality>::EndOfSync);
output_default_colour_burst(LineLayout<personality>::EndOfColourBurst - LineLayout<personality>::StartOfColourBurst);
output_blank(LineLayout<personality>::EndOfLeftErase - LineLayout<personality>::EndOfColourBurst);
}
// Left border.
border(Timing<personality>::StartOfLeftBorder, this->draw_line_buffer_->first_pixel_output_column);
border(LineLayout<personality>::EndOfLeftErase, this->draw_line_buffer_->first_pixel_output_column);
#define draw(function, clock) { \
const int relative_start = from_internal<personality, clock>(start - this->draw_line_buffer_->first_pixel_output_column); \
@ -588,9 +587,12 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
#undef draw
// Additional right border, if called for.
if(this->draw_line_buffer_->next_border_column != Timing<personality>::CyclesPerLine) {
border(this->draw_line_buffer_->next_border_column, Timing<personality>::CyclesPerLine);
// Right border.
border(this->draw_line_buffer_->next_border_column, LineLayout<personality>::EndOfRightBorder);
// Right erase.
if(this->output_pointer_.column == Timing<personality>::CyclesPerLine) {
output_blank(Timing<personality>::CyclesPerLine - LineLayout<personality>::EndOfRightBorder);
}
}

19
Components/9918/Implementation/ClockConverter.hpp
View File

@ -70,25 +70,6 @@ template <Personality personality> struct StandardTiming {
/// The final internal cycle at which pixels will be output text mode.
constexpr static int LastTextCycle = 334 * CyclesPerLine / 342;
// For the below, the fixed portion of line layout is:
//
// [0, EndOfRightBorder): right border colour
// [EndOfRightBorder, StartOfSync): blank
// [StartOfSync, EndOfSync): sync
// [EndOfSync, StartOfColourBurst): blank
// [StartOfColourBurst, EndOfColourBurst): the colour burst
// [EndOfColourBurst, StartOfLeftBorder): blank
//
// The region from StartOfLeftBorder until the end is then filled with
// some combination of pixels and more border, depending on the vertical
// position of this line and the current screen mode.
constexpr static int EndOfRightBorder = 15 * CyclesPerLine / 342;
constexpr static int StartOfSync = 23 * CyclesPerLine / 342;
constexpr static int EndOfSync = 49 * CyclesPerLine / 342;
constexpr static int StartOfColourBurst = 51 * CyclesPerLine / 342;
constexpr static int EndOfColourBurst = 65 * CyclesPerLine / 342;
constexpr static int StartOfLeftBorder = 73 * CyclesPerLine / 342;
};
/// Provides concrete, specific timing for the nominated personality.