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#include "ultra64.h"
#include "ultra64/viint.h"
void __osViSwapContext(void) {
register OSViMode* viMode;
register OSViContext* viNext;
u32 origin;
u32 hStart;
u32 vstart;
u32 nomValue;
u32 field;
field = 0;
viNext = __osViNext;
viMode = viNext->modep;
field = IO_READ(VI_V_CURRENT_LINE_REG) & 1; // even or odd field
origin = osVirtualToPhysical(viNext->framep) + viMode->fldRegs[field].origin;
if (viNext->state & VI_STATE_XSCALE_SET) {
viNext->x.scale |= viMode->comRegs.xScale & ~VI_SCALE_MASK;
} else {
viNext->x.scale = viMode->comRegs.xScale;
}
if (viNext->state & VI_STATE_YSCALE_FACTOR_SET) {
nomValue = (u32)(viMode->fldRegs[field].yScale & VI_SCALE_MASK);
viNext->y.scale = viNext->y.factor * nomValue;
viNext->y.scale |= viMode->fldRegs[field].yScale & ~VI_SCALE_MASK;
} else {
viNext->y.scale = viMode->fldRegs[field].yScale;
}
vstart = (viMode->fldRegs[field].vStart - (__additional_scanline << VI_SUBPIXEL_SH)) + __additional_scanline;
hStart = viMode->comRegs.hStart;
if (viNext->state & VI_STATE_BLACK) {
hStart = 0;
}
if (viNext->state & VI_STATE_REPEATLINE) {
viNext->y.scale = 0;
origin = osVirtualToPhysical(viNext->framep);
}
if (viNext->state & VI_STATE_FADE) {
viNext->y.scale = (viNext->y.offset << VI_SUBPIXEL_SH) & (VI_2_10_FPART_MASK << VI_SUBPIXEL_SH);
origin = osVirtualToPhysical(viNext->framep);
}
IO_WRITE(VI_ORIGIN_REG, origin);
IO_WRITE(VI_WIDTH_REG, viMode->comRegs.width);
IO_WRITE(VI_BURST_REG, viMode->comRegs.burst);
IO_WRITE(VI_V_SYNC_REG, viMode->comRegs.vSync);
IO_WRITE(VI_H_SYNC_REG, viMode->comRegs.hSync);
IO_WRITE(VI_LEAP_REG, viMode->comRegs.leap);
IO_WRITE(VI_H_START_REG, hStart);
IO_WRITE(VI_V_START_REG, vstart);
IO_WRITE(VI_V_BURST_REG, viMode->fldRegs[field].vBurst);
IO_WRITE(VI_INTR_REG, viMode->fldRegs[field].vIntr);
IO_WRITE(VI_X_SCALE_REG, viNext->x.scale);
IO_WRITE(VI_Y_SCALE_REG, viNext->y.scale);
IO_WRITE(VI_CONTROL_REG, viNext->features);
__osViNext = __osViCurr;
__osViCurr = viNext;
*__osViNext = *__osViCurr;
}
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