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It appears the Vic's output is sine-ish, after all. Also adjusted centre of display, simultaneously adding some validation on that.

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This commit is contained in:
Thomas Harte 2016-06-14 07:29:35 -04:00
parent fdc854c0c2
commit c18cc4c8f5
2 changed files with 17 additions and 8 deletions
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14
Components/6560/6560.cpp
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@ -25,8 +25,8 @@ MOS6560::MOS6560() :
"uint yC = c & 15u;"
"float phaseOffset = 6.283185308 * float(yC) / 16.0;"
"float chroma = step(mod(phase + phaseOffset + 0.785398163397448, 6.283185308), 3.141592654);"
// "float chroma = cos(phase + phaseOffset);"
// "float chroma = step(mod(phase + phaseOffset + 0.785398163397448, 6.283185308), 3.141592654);"
"float chroma = cos(phase + phaseOffset);"
"return mix(y, step(yC, 14) * chroma, amplitude);"
"}");
@ -37,10 +37,8 @@ MOS6560::MOS6560() :
// 3, 7, D, F
// 1
uint8_t luminances[16] = { // range is 0–4
0, 4, 1, 3,
2, 2, 1, 3,
2, 1, 2, 1,
2, 3, 2, 3
0, 4, 1, 3, 2, 2, 1, 3,
2, 1, 2, 1, 2, 3, 2, 3
};
// uint8_t pal_chrominances[16] = { // range is 0–15; 15 is a special case meaning "no chrominance"
// 15, 15, 5, 13, 2, 10, 0, 8,
@ -55,8 +53,8 @@ MOS6560::MOS6560() :
_colours[c] = (uint8_t)((luminances[c] << 4) | ntsc_chrominances[c]);
}
// show the middle 90%
_crt->set_visible_area(Outputs::CRT::Rect(0.05f, 0.05f, 0.9f, 0.9f));
// show only the centre
_crt->set_visible_area(_crt->get_rect_for_area(16, 237, 11*4, 55*4, 4.0f / 3.0f));
_speaker.set_input_rate(255681.75); // assuming NTSC; clock rate / 4
}

11
Outputs/CRT/CRT.cpp
View File

@ -377,6 +377,10 @@ Outputs::CRT::Rect CRT::get_rect_for_area(int first_line_after_sync, int number_
unsigned int horizontal_scan_period = _horizontal_flywheel->get_scan_period();
unsigned int horizontal_retrace_period = horizontal_period - horizontal_scan_period;
// make sure that the requested range is visible
if(first_cycle_after_sync < horizontal_retrace_period) first_cycle_after_sync = (int)horizontal_retrace_period;
if(first_cycle_after_sync + number_of_cycles > horizontal_scan_period) number_of_cycles = (int)(horizontal_scan_period - (unsigned)first_cycle_after_sync);
float start_x = (float)((unsigned)first_cycle_after_sync - horizontal_retrace_period) / (float)horizontal_scan_period;
float width = (float)number_of_cycles / (float)horizontal_scan_period;
@ -384,6 +388,13 @@ Outputs::CRT::Rect CRT::get_rect_for_area(int first_line_after_sync, int number_
unsigned int vertical_period = _vertical_flywheel->get_standard_period();
unsigned int vertical_scan_period = _vertical_flywheel->get_scan_period();
unsigned int vertical_retrace_period = vertical_period - vertical_scan_period;
// make sure that the requested range is visible
// if((unsigned)first_line_after_sync * horizontal_period < vertical_retrace_period)
// first_line_after_sync = (vertical_retrace_period + horizontal_period - 1) / horizontal_period;
// if((first_line_after_sync + number_of_lines) * horizontal_period > vertical_scan_period)
// number_of_lines = (int)(horizontal_scan_period - (unsigned)first_cycle_after_sync);
float start_y = (float)(((unsigned)first_line_after_sync * horizontal_period) - vertical_retrace_period) / (float)vertical_scan_period;
float height = (float)((unsigned)number_of_lines * horizontal_period) / vertical_scan_period;