162 lines
4.7 KiB
C
162 lines
4.7 KiB
C
#include "global.h"
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#define FTOFRAC8(x) ((s32)MIN(((x) * (128.0f)), 127.0f) & 0xff)
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/**
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* guLookAtHiliteF
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* This function creates the viewing matrix (floating point) and sets the LookAt/Hilite structures
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**/
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void guLookAtHiliteF(f32 mf[4][4], LookAt* l, Hilite* h, f32 xEye, f32 yEye, f32 zEye, f32 xAt, f32 yAt, f32 zAt,
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f32 xUp, f32 yUp, f32 zUp, f32 xl1, f32 yl1, f32 zl1, /* light 1 direction */
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f32 xl2, f32 yl2, f32 zl2, /* light 2 direction */
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s32 hiliteWidth, s32 hiliteHeight) /* size of hilite texture */
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{
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f32 length;
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f32 xLook;
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f32 yLook;
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f32 zLook;
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f32 xRight;
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f32 yRight;
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f32 zRight;
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f32 xHilite;
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f32 yHilite;
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f32 zHilite;
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guMtxIdentF(mf);
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xLook = xAt - xEye;
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yLook = yAt - yEye;
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zLook = zAt - zEye;
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length = -1.0 / sqrtf(xLook * xLook + yLook * yLook + zLook * zLook);
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xLook *= length;
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yLook *= length;
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zLook *= length;
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xRight = yUp * zLook - zUp * yLook;
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yRight = zUp * xLook - xUp * zLook;
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zRight = xUp * yLook - yUp * xLook;
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length = 1.0 / sqrtf(xRight * xRight + yRight * yRight + zRight * zRight);
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xRight *= length;
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yRight *= length;
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zRight *= length;
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xUp = yLook * zRight - zLook * yRight;
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yUp = zLook * xRight - xLook * zRight;
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zUp = xLook * yRight - yLook * xRight;
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length = 1.0 / sqrtf(xUp * xUp + yUp * yUp + zUp * zUp);
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xUp *= length;
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yUp *= length;
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zUp *= length;
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/* hilite vectors */
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length = 1.0 / sqrtf(xl1 * xl1 + yl1 * yl1 + zl1 * zl1);
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xl1 *= length;
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yl1 *= length;
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zl1 *= length;
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xHilite = xl1 + xLook;
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yHilite = yl1 + yLook;
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zHilite = zl1 + zLook;
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length = sqrtf(xHilite * xHilite + yHilite * yHilite + zHilite * zHilite);
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if (length > 0.1) {
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length = 1.0 / length;
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xHilite *= length;
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yHilite *= length;
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zHilite *= length;
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h->h.x1 = hiliteWidth * 4 + (xHilite * xRight + yHilite * yRight + zHilite * zRight) * hiliteWidth * 2;
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h->h.y1 = hiliteHeight * 4 + (xHilite * xUp + yHilite * yUp + zHilite * zUp) * hiliteHeight * 2;
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} else {
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h->h.x1 = hiliteWidth * 2;
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h->h.y1 = hiliteHeight * 2;
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}
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length = 1.0 / sqrtf(xl2 * xl2 + yl2 * yl2 + zl2 * zl2);
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xl2 *= length;
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yl2 *= length;
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zl2 *= length;
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xHilite = xl2 + xLook;
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yHilite = yl2 + yLook;
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zHilite = zl2 + zLook;
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length = sqrtf(xHilite * xHilite + yHilite * yHilite + zHilite * zHilite);
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if (length > 0.1) {
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length = 1.0 / length;
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xHilite *= length;
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yHilite *= length;
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zHilite *= length;
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h->h.x2 = hiliteWidth * 4 + (xHilite * xRight + yHilite * yRight + zHilite * zRight) * hiliteWidth * 2;
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h->h.y2 = hiliteHeight * 4 + (xHilite * xUp + yHilite * yUp + zHilite * zUp) * hiliteHeight * 2;
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} else {
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h->h.x2 = hiliteWidth * 2;
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h->h.y2 = hiliteHeight * 2;
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}
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/* reflectance vectors = Up and Right */
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l->l[0].l.dir[0] = FTOFRAC8(xRight);
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l->l[0].l.dir[1] = FTOFRAC8(yRight);
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l->l[0].l.dir[2] = FTOFRAC8(zRight);
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l->l[1].l.dir[0] = FTOFRAC8(xUp);
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l->l[1].l.dir[1] = FTOFRAC8(yUp);
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l->l[1].l.dir[2] = FTOFRAC8(zUp);
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l->l[0].l.col[0] = 0x00;
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l->l[0].l.col[1] = 0x00;
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l->l[0].l.col[2] = 0x00;
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l->l[0].l.pad1 = 0x00;
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l->l[0].l.colc[0] = 0x00;
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l->l[0].l.colc[1] = 0x00;
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l->l[0].l.colc[2] = 0x00;
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l->l[0].l.pad2 = 0x00;
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l->l[1].l.col[0] = 0x00;
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l->l[1].l.col[1] = 0x80;
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l->l[1].l.col[2] = 0x00;
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l->l[1].l.pad1 = 0x00;
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l->l[1].l.colc[0] = 0x00;
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l->l[1].l.colc[1] = 0x80;
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l->l[1].l.colc[2] = 0x00;
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l->l[1].l.pad2 = 0x00;
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mf[0][0] = xRight;
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mf[1][0] = yRight;
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mf[2][0] = zRight;
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mf[3][0] = -(xEye * xRight + yEye * yRight + zEye * zRight);
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mf[0][1] = xUp;
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mf[1][1] = yUp;
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mf[2][1] = zUp;
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mf[3][1] = -(xEye * xUp + yEye * yUp + zEye * zUp);
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mf[0][2] = xLook;
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mf[1][2] = yLook;
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mf[2][2] = zLook;
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mf[3][2] = -(xEye * xLook + yEye * yLook + zEye * zLook);
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mf[0][3] = 0;
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mf[1][3] = 0;
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mf[2][3] = 0;
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mf[3][3] = 1;
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}
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/**
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* guLookAtHilite
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* This function creates the viewing matrix (fixed point) and sets the LookAt/Hilite structures
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* Same args as previous function
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**/
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void guLookAtHilite(Mtx* m, LookAt* l, Hilite* h, f32 xEye, f32 yEye, f32 zEye, f32 xAt, f32 yAt, f32 zAt, f32 xUp,
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f32 yUp, f32 zUp, f32 xl1, f32 yl1, f32 zl1, f32 xl2, f32 yl2, f32 zl2, s32 hiliteWidth,
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s32 hiliteHeight) {
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f32 mf[4][4];
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guLookAtHiliteF(mf, l, h, xEye, yEye, zEye, xAt, yAt, zAt, xUp, yUp, zUp, xl1, yl1, zl1, xl2, yl2, zl2, hiliteWidth,
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hiliteHeight);
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guMtxF2L((MtxF*)mf, m);
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}
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