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263 lines
7.1 KiB
C
263 lines
7.1 KiB
C
/*
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* Copyright 2007 David Adam
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* Copyright 2007 Vijay Kiran Kamuju
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "d3drm_private.h"
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/* Create a RGB color from its components */
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D3DCOLOR WINAPI D3DRMCreateColorRGB(D3DVALUE red, D3DVALUE green, D3DVALUE blue)
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{
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return D3DRMCreateColorRGBA(red, green, blue, 1.0f);
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}
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/* Create a RGBA color from its components */
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D3DCOLOR WINAPI D3DRMCreateColorRGBA(D3DVALUE red, D3DVALUE green, D3DVALUE blue, D3DVALUE alpha)
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{
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D3DCOLOR color;
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d3drm_set_color(&color, red, green, blue, alpha);
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return color;
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}
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/* Determine the alpha part of a color */
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D3DVALUE WINAPI D3DRMColorGetAlpha(D3DCOLOR color)
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{
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return (RGBA_GETALPHA(color)/255.0);
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}
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/* Determine the blue part of a color */
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D3DVALUE WINAPI D3DRMColorGetBlue(D3DCOLOR color)
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{
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return (RGBA_GETBLUE(color)/255.0);
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}
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/* Determine the green part of a color */
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D3DVALUE WINAPI D3DRMColorGetGreen(D3DCOLOR color)
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{
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return (RGBA_GETGREEN(color)/255.0);
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}
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/* Determine the red part of a color */
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D3DVALUE WINAPI D3DRMColorGetRed(D3DCOLOR color)
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{
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return (RGBA_GETRED(color)/255.0);
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}
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/* Product of 2 quaternions */
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D3DRMQUATERNION * WINAPI D3DRMQuaternionMultiply(D3DRMQUATERNION *q, D3DRMQUATERNION *a, D3DRMQUATERNION *b)
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{
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D3DRMQUATERNION temp;
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D3DVECTOR cross_product;
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D3DRMVectorCrossProduct(&cross_product, &a->v, &b->v);
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temp.s = a->s * b->s - D3DRMVectorDotProduct(&a->v, &b->v);
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temp.v.u1.x = a->s * b->v.u1.x + b->s * a->v.u1.x + cross_product.u1.x;
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temp.v.u2.y = a->s * b->v.u2.y + b->s * a->v.u2.y + cross_product.u2.y;
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temp.v.u3.z = a->s * b->v.u3.z + b->s * a->v.u3.z + cross_product.u3.z;
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*q = temp;
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return q;
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}
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/* Matrix for the Rotation that a unit quaternion represents */
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void WINAPI D3DRMMatrixFromQuaternion(D3DRMMATRIX4D m, D3DRMQUATERNION *q)
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{
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D3DVALUE w,x,y,z;
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w = q->s;
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x = q->v.u1.x;
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y = q->v.u2.y;
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z = q->v.u3.z;
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m[0][0] = 1.0-2.0*(y*y+z*z);
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m[1][1] = 1.0-2.0*(x*x+z*z);
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m[2][2] = 1.0-2.0*(x*x+y*y);
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m[1][0] = 2.0*(x*y+z*w);
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m[0][1] = 2.0*(x*y-z*w);
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m[2][0] = 2.0*(x*z-y*w);
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m[0][2] = 2.0*(x*z+y*w);
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m[2][1] = 2.0*(y*z+x*w);
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m[1][2] = 2.0*(y*z-x*w);
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m[3][0] = 0.0;
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m[3][1] = 0.0;
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m[3][2] = 0.0;
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m[0][3] = 0.0;
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m[1][3] = 0.0;
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m[2][3] = 0.0;
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m[3][3] = 1.0;
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}
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/* Return a unit quaternion that represents a rotation of an angle around an axis */
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D3DRMQUATERNION * WINAPI D3DRMQuaternionFromRotation(D3DRMQUATERNION *q, D3DVECTOR *v, D3DVALUE theta)
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{
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q->s = cos(theta/2.0);
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D3DRMVectorScale(&q->v, D3DRMVectorNormalize(v), sin(theta/2.0));
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return q;
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}
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/* Interpolation between two quaternions */
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D3DRMQUATERNION * WINAPI D3DRMQuaternionSlerp(D3DRMQUATERNION *q,
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D3DRMQUATERNION *a, D3DRMQUATERNION *b, D3DVALUE alpha)
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{
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D3DVALUE dot, epsilon, temp, theta, u;
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D3DVECTOR v1, v2;
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dot = a->s * b->s + D3DRMVectorDotProduct(&a->v, &b->v);
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epsilon = 1.0f;
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temp = 1.0f - alpha;
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u = alpha;
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if (dot < 0.0)
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{
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epsilon = -1.0;
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dot = -dot;
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}
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if( 1.0f - dot > 0.001f )
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{
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theta = acos(dot);
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temp = sin(theta * temp) / sin(theta);
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u = sin(theta * alpha) / sin(theta);
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}
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q->s = temp * a->s + epsilon * u * b->s;
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D3DRMVectorScale(&v1, &a->v, temp);
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D3DRMVectorScale(&v2, &b->v, epsilon * u);
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D3DRMVectorAdd(&q->v, &v1, &v2);
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return q;
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}
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/* Add Two Vectors */
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D3DVECTOR * WINAPI D3DRMVectorAdd(D3DVECTOR *d, D3DVECTOR *s1, D3DVECTOR *s2)
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{
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D3DVECTOR temp;
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temp.u1.x=s1->u1.x + s2->u1.x;
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temp.u2.y=s1->u2.y + s2->u2.y;
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temp.u3.z=s1->u3.z + s2->u3.z;
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*d = temp;
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return d;
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}
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/* Subtract Two Vectors */
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D3DVECTOR * WINAPI D3DRMVectorSubtract(D3DVECTOR *d, D3DVECTOR *s1, D3DVECTOR *s2)
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{
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D3DVECTOR temp;
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temp.u1.x=s1->u1.x - s2->u1.x;
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temp.u2.y=s1->u2.y - s2->u2.y;
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temp.u3.z=s1->u3.z - s2->u3.z;
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*d = temp;
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return d;
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}
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/* Cross Product of Two Vectors */
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D3DVECTOR * WINAPI D3DRMVectorCrossProduct(D3DVECTOR *d, D3DVECTOR *s1, D3DVECTOR *s2)
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{
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D3DVECTOR temp;
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temp.u1.x=s1->u2.y * s2->u3.z - s1->u3.z * s2->u2.y;
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temp.u2.y=s1->u3.z * s2->u1.x - s1->u1.x * s2->u3.z;
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temp.u3.z=s1->u1.x * s2->u2.y - s1->u2.y * s2->u1.x;
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*d = temp;
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return d;
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}
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/* Dot Product of Two vectors */
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D3DVALUE WINAPI D3DRMVectorDotProduct(D3DVECTOR *s1, D3DVECTOR *s2)
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{
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D3DVALUE dot_product;
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dot_product=s1->u1.x * s2->u1.x + s1->u2.y * s2->u2.y + s1->u3.z * s2->u3.z;
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return dot_product;
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}
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/* Norm of a vector */
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D3DVALUE WINAPI D3DRMVectorModulus(D3DVECTOR *v)
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{
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D3DVALUE result;
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result=sqrt(v->u1.x * v->u1.x + v->u2.y * v->u2.y + v->u3.z * v->u3.z);
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return result;
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}
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/* Normalize a vector. Returns (1,0,0) if INPUT is the NULL vector. */
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D3DVECTOR * WINAPI D3DRMVectorNormalize(D3DVECTOR *u)
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{
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D3DVALUE modulus = D3DRMVectorModulus(u);
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if(modulus)
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{
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D3DRMVectorScale(u,u,1.0/modulus);
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}
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else
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{
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u->u1.x=1.0;
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u->u2.y=0.0;
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u->u3.z=0.0;
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}
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return u;
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}
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/* Returns a random unit vector */
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D3DVECTOR * WINAPI D3DRMVectorRandom(D3DVECTOR *d)
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{
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d->u1.x = rand();
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d->u2.y = rand();
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d->u3.z = rand();
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D3DRMVectorNormalize(d);
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return d;
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}
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/* Reflection of a vector on a surface */
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D3DVECTOR * WINAPI D3DRMVectorReflect(D3DVECTOR *r, D3DVECTOR *ray, D3DVECTOR *norm)
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{
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D3DVECTOR sca, temp;
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D3DRMVectorSubtract(&temp, D3DRMVectorScale(&sca, norm, 2.0*D3DRMVectorDotProduct(ray,norm)), ray);
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*r = temp;
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return r;
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}
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/* Rotation of a vector */
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D3DVECTOR * WINAPI D3DRMVectorRotate(D3DVECTOR *r, D3DVECTOR *v, D3DVECTOR *axis, D3DVALUE theta)
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{
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D3DRMQUATERNION quaternion1, quaternion2, quaternion3;
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D3DVECTOR norm;
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quaternion1.s = cos(theta * 0.5f);
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quaternion2.s = cos(theta * 0.5f);
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norm = *D3DRMVectorNormalize(axis);
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D3DRMVectorScale(&quaternion1.v, &norm, sin(theta * 0.5f));
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D3DRMVectorScale(&quaternion2.v, &norm, -sin(theta * 0.5f));
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quaternion3.s = 0.0;
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quaternion3.v = *v;
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D3DRMQuaternionMultiply(&quaternion1, &quaternion1, &quaternion3);
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D3DRMQuaternionMultiply(&quaternion1, &quaternion1, &quaternion2);
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*r = *D3DRMVectorNormalize(&quaternion1.v);
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return r;
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}
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/* Scale a vector */
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D3DVECTOR * WINAPI D3DRMVectorScale(D3DVECTOR *d, D3DVECTOR *s, D3DVALUE factor)
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{
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D3DVECTOR temp;
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temp.u1.x=factor * s->u1.x;
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temp.u2.y=factor * s->u2.y;
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temp.u3.z=factor * s->u3.z;
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*d = temp;
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return d;
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}
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