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Upped internal precision a little.

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This commit is contained in:
Thomas Harte 2015-07-24 23:36:44 -04:00
parent ecb2898bd5
commit cea2580000
2 changed files with 16 additions and 8 deletions
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20
Outputs/CRT.cpp
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@ -18,19 +18,21 @@ CRT::CRT(int cycles_per_line, int height_of_display, int number_of_buffers, ...)
const int millisecondsHorizontalRetraceTime = 7; // source: Dictionary of Video and Television Technology, p. 234
const int scanlinesVerticalRetraceTime = 10; // source: ibid
_time_multiplier = (1000 + cycles_per_line - 1) / cycles_per_line;
// store fundamental display configuration properties
_height_of_display = height_of_display;
_cycles_per_line = cycles_per_line;
_cycles_per_line = cycles_per_line * _time_multiplier;
// generate timing values implied by the given arbuments
_hsync_error_window = cycles_per_line >> 5;
_hsync_error_window = _cycles_per_line >> 5;
_sync_capacitor_charge_threshold = syncCapacityLineChargeThreshold * cycles_per_line;
_horizontal_retrace_time = (millisecondsHorizontalRetraceTime * cycles_per_line) >> 6;
_vertical_retrace_time = scanlinesVerticalRetraceTime * cycles_per_line;
_sync_capacitor_charge_threshold = syncCapacityLineChargeThreshold * _cycles_per_line;
_horizontal_retrace_time = (millisecondsHorizontalRetraceTime * _cycles_per_line) >> 6;
_vertical_retrace_time = scanlinesVerticalRetraceTime * _cycles_per_line;
_scanSpeed.x = UINT32_MAX / cycles_per_line;
_scanSpeed.y = UINT32_MAX / (height_of_display * cycles_per_line);
_scanSpeed.x = UINT32_MAX / _cycles_per_line;
_scanSpeed.y = UINT32_MAX / (height_of_display * _cycles_per_line);
_retraceSpeed.x = UINT32_MAX / _horizontal_retrace_time;
_retraceSpeed.y = UINT32_MAX / _vertical_retrace_time;
@ -53,7 +55,7 @@ CRT::CRT(int cycles_per_line, int height_of_display, int number_of_buffers, ...)
_rasterPosition.x = _rasterPosition.y = 0;
// reset flywheel sync
_expected_next_hsync = cycles_per_line;
_expected_next_hsync = _cycles_per_line;
_horizontal_counter = 0;
// reset the vertical charge capacitor
@ -143,6 +145,8 @@ CRT::SyncEvent CRT::next_horizontal_sync_event(bool hsync_is_requested, int cycl
void CRT::advance_cycles(int number_of_cycles, bool hsync_requested, const bool vsync_charging, const Type type, const char *data_type)
{
number_of_cycles *= _time_multiplier;
const bool is_output_run = ((type == Type::Level) || (type == Type::Data));
uint16_t tex_x = 0;
uint16_t tex_y = 0;

4
Outputs/CRT.hpp
View File

@ -66,6 +66,10 @@ class CRT {
uint8_t *get_write_target_for_buffer(int buffer);
private:
// the incoming clock lengths will be multiplied by something to give at least 1000
// sample points per line
int _time_multiplier;
// fundamental creator-specified properties
int _cycles_per_line;
int _height_of_display;