// Loosely following the structure in z26/2600core.c::ScanFrame()
void simulate_single_frame(const uint8_t* byte_code,
size_t size,
uint8_t* output_picture) {
struct z26_state* s = init_z26_state(output_picture);
s->ROM_data = byte_code;
s->ROM_size = size;
// Simulate frame.
while (s->Frame == 0) {
nTIALineTo(s);
++s->ScanLine;
s->RClock -= CYCLESPERSCANLINE;
}
// Clean up.
free(s);
}
void ScanFrame() {
/* Reset display pointer */
ScreenBuffer = DisplayPointer;
do {
/* Generate a raster line */
nTIALineTo();
ScanLine++;
/* adjust RClock for next line */
RClock -= 76;
/* if charging capacitors... */
if( !(VBlank & 0x80) )
/* and if not fully charged... */
if(ChargeCounter < 0x80000000)
/* add some charge. */
ChargeCounter++;
if( ScanLine >= OurBailoutLine) {
BailoutLine = OurBailoutLine;
PrevLinesInFrame = LinesInFrame;
LinesInFrame = ScanLine-1;
Frame++;
ScanLine = 1;
}
} while (Frame == PrevFrame); /* Frame gets updated by tiawrite.asm */
/* Done with frame. Blank rest of screen buffer, update PrevFrame,
and return to caller. */
BlankBufferEnd();
Frame = PrevFrame;
}
