63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
#include "global.h"
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void __osViSwapContext(void) {
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register OSViMode* viMode;
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register OSViContext* viNext;
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u32 origin;
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u32 hStart;
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u32 vstart;
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u32 sp34;
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u32 field;
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register u32 s2;
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field = 0;
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viNext = __osViNext;
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viMode = viNext->modep;
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field = HW_REG(VI_V_CURRENT_LINE_REG, u32) & 1;
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s2 = osVirtualToPhysical(viNext->buffer);
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origin = (viMode->fldRegs[field].origin) + s2;
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if (viNext->state & 2) {
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viNext->x.scale |= viMode->comRegs.xScale & ~0xFFF;
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} else {
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viNext->x.scale = viMode->comRegs.xScale;
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}
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if (viNext->state & 4) {
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sp34 = (u32)(viMode->fldRegs[field].yScale & 0xFFF);
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viNext->y.scale = viNext->y.factor * sp34;
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viNext->y.scale |= viMode->fldRegs[field].yScale & ~0xFFF;
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} else {
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viNext->y.scale = viMode->fldRegs[field].yScale;
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}
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vstart = (viMode->fldRegs[field].vStart - (__additional_scanline << 0x10)) + __additional_scanline;
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hStart = viMode->comRegs.hStart;
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if (viNext->state & 0x20) {
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hStart = 0;
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}
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if (viNext->state & 0x40) {
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viNext->y.scale = 0;
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origin = osVirtualToPhysical(viNext->buffer);
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}
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if (viNext->state & 0x80) {
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viNext->y.scale = (viNext->y.offset << 0x10) & 0x3FF0000;
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origin = osVirtualToPhysical(viNext->buffer);
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}
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HW_REG(VI_ORIGIN_REG, u32) = origin;
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HW_REG(VI_WIDTH_REG, u32) = viMode->comRegs.width;
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HW_REG(VI_BURST_REG, u32) = viMode->comRegs.burst;
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HW_REG(VI_V_SYNC_REG, u32) = viMode->comRegs.vSync;
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HW_REG(VI_H_SYNC_REG, u32) = viMode->comRegs.hSync;
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HW_REG(VI_LEAP_REG, u32) = viMode->comRegs.leap;
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HW_REG(VI_H_START_REG, u32) = hStart;
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HW_REG(VI_V_START_REG, u32) = vstart;
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HW_REG(VI_V_BURST_REG, u32) = viMode->fldRegs[field].vBurst;
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HW_REG(VI_INTR_REG, u32) = viMode->fldRegs[field].vIntr;
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HW_REG(VI_X_SCALE_REG, u32) = viNext->x.scale;
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HW_REG(VI_Y_SCALE_REG, u32) = viNext->y.scale;
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HW_REG(VI_CONTROL_REG, u32) = viNext->features;
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__osViNext = __osViCurr;
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__osViCurr = viNext;
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*__osViNext = *__osViCurr;
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}
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