mirror of
https://github.com/libretro/snes9x.git
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159 lines
3.7 KiB
C++
159 lines
3.7 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include <math.h>
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#include "snes9x.h"
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#include "memmap.h"
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#define C4_PI 3.14159265
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int16 C4WFXVal;
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int16 C4WFYVal;
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int16 C4WFZVal;
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int16 C4WFX2Val;
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int16 C4WFY2Val;
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int16 C4WFDist;
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int16 C4WFScale;
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int16 C41FXVal;
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int16 C41FYVal;
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int16 C41FAngleRes;
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int16 C41FDist;
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int16 C41FDistVal;
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static double tanval;
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static double c4x, c4y, c4z;
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static double c4x2, c4y2, c4z2;
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void C4TransfWireFrame (void)
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{
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c4x = (double) C4WFXVal;
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c4y = (double) C4WFYVal;
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c4z = (double) C4WFZVal - 0x95;
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// Rotate X
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tanval = -(double) C4WFX2Val * C4_PI * 2 / 128;
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c4y2 = c4y * cos(tanval) - c4z * sin(tanval);
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c4z2 = c4y * sin(tanval) + c4z * cos(tanval);
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// Rotate Y
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tanval = -(double) C4WFY2Val * C4_PI * 2 / 128;
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c4x2 = c4x * cos(tanval) + c4z2 * sin(tanval);
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c4z = c4x * -sin(tanval) + c4z2 * cos(tanval);
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// Rotate Z
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tanval = -(double) C4WFDist * C4_PI * 2 / 128;
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c4x = c4x2 * cos(tanval) - c4y2 * sin(tanval);
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c4y = c4x2 * sin(tanval) + c4y2 * cos(tanval);
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// Scale
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C4WFXVal = (int16) (c4x * (double) C4WFScale / (0x90 * (c4z + 0x95)) * 0x95);
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C4WFYVal = (int16) (c4y * (double) C4WFScale / (0x90 * (c4z + 0x95)) * 0x95);
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}
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void C4TransfWireFrame2 (void)
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{
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c4x = (double) C4WFXVal;
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c4y = (double) C4WFYVal;
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c4z = (double) C4WFZVal;
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// Rotate X
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tanval = -(double) C4WFX2Val * C4_PI * 2 / 128;
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c4y2 = c4y * cos(tanval) - c4z * sin(tanval);
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c4z2 = c4y * sin(tanval) + c4z * cos(tanval);
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// Rotate Y
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tanval = -(double) C4WFY2Val * C4_PI * 2 / 128;
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c4x2 = c4x * cos(tanval) + c4z2 * sin(tanval);
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c4z = c4x * -sin(tanval) + c4z2 * cos(tanval);
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// Rotate Z
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tanval = -(double) C4WFDist * C4_PI * 2 / 128;
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c4x = c4x2 * cos(tanval) - c4y2 * sin(tanval);
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c4y = c4x2 * sin(tanval) + c4y2 * cos(tanval);
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// Scale
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C4WFXVal = (int16) (c4x * (double) C4WFScale / 0x100);
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C4WFYVal = (int16) (c4y * (double) C4WFScale / 0x100);
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}
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void C4CalcWireFrame (void)
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{
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C4WFXVal = C4WFX2Val - C4WFXVal;
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C4WFYVal = C4WFY2Val - C4WFYVal;
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if (abs(C4WFXVal) > abs(C4WFYVal))
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{
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C4WFDist = abs(C4WFXVal) + 1;
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C4WFYVal = (int16) (256 * (double) C4WFYVal / abs(C4WFXVal));
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if (C4WFXVal < 0)
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C4WFXVal = -256;
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else
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C4WFXVal = 256;
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}
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else
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{
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if (C4WFYVal != 0)
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{
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C4WFDist = abs(C4WFYVal) + 1;
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C4WFXVal = (int16) (256 * (double) C4WFXVal / abs(C4WFYVal));
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if (C4WFYVal < 0)
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C4WFYVal = -256;
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else
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C4WFYVal = 256;
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}
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else
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C4WFDist = 0;
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}
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}
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void C4Op1F (void)
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{
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if (C41FXVal == 0)
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{
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if (C41FYVal > 0)
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C41FAngleRes = 0x80;
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else
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C41FAngleRes = 0x180;
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}
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else
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{
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tanval = (double) C41FYVal / C41FXVal;
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C41FAngleRes = (int16) (atan(tanval) / (C4_PI * 2) * 512);
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if (C41FXVal< 0)
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C41FAngleRes += 0x100;
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C41FAngleRes &= 0x1FF;
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}
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}
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void C4Op15 (void)
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{
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tanval = sqrt((double) C41FYVal * C41FYVal + (double) C41FXVal * C41FXVal);
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C41FDist = (int16) tanval;
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}
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void C4Op0D (void)
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{
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tanval = sqrt((double) C41FYVal * C41FYVal + (double) C41FXVal * C41FXVal);
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tanval = C41FDistVal / tanval;
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C41FYVal = (int16) (C41FYVal * tanval * 0.99);
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C41FXVal = (int16) (C41FXVal * tanval * 0.98);
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}
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uint8 * S9xGetBasePointerC4 (uint16 Address)
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{
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if (Address >= 0x7f40 && Address <= 0x7f5e)
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return (NULL);
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return (Memory.C4RAM - 0x6000);
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}
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uint8 * S9xGetMemPointerC4 (uint16 Address)
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{
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if (Address >= 0x7f40 && Address <= 0x7f5e)
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return (NULL);
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return (Memory.C4RAM - 0x6000 + (Address & 0xffff));
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}
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