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Update linmath.h
This commit is contained in:
Camilla Löwy
parent
1f34295a74
commit
9c62a21ba9
151
deps/linmath.h
vendored
151
deps/linmath.h
vendored
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@ -1,13 +1,8 @@
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#ifndef LINMATH_H
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#define LINMATH_H
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#include <string.h>
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#include <math.h>
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/* 2020-03-02 Camilla Löwy <elmindreda@elmindreda.org>
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* - Added inclusion of string.h for memcpy
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* - Replaced tan and acos with tanf and acosf
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* - Replaced double constants with float equivalents
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*/
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#include <string.h>
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#ifdef LINMATH_NO_INLINE
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@ -38,7 +33,7 @@ LINMATH_H_FUNC void vec##n##_scale(vec##n r, vec##n const v, float const s) \
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} \
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LINMATH_H_FUNC float vec##n##_mul_inner(vec##n const a, vec##n const b) \
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{ \
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float p = 0.; \
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float p = 0.f; \
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int i; \
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for(i=0; i<n; ++i) \
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p += b[i]*a[i]; \
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@ -64,6 +59,12 @@ LINMATH_H_FUNC void vec##n##_max(vec##n r, vec##n const a, vec##n const b) \
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int i; \
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for(i=0; i<n; ++i) \
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r[i] = a[i]>b[i] ? a[i] : b[i]; \
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} \
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LINMATH_H_FUNC void vec##n##_dup(vec##n r, vec##n const src) \
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{ \
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int i; \
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for(i=0; i<n; ++i) \
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r[i] = src[i]; \
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}
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LINMATH_H_DEFINE_VEC(2)
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@ -79,13 +80,13 @@ LINMATH_H_FUNC void vec3_mul_cross(vec3 r, vec3 const a, vec3 const b)
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LINMATH_H_FUNC void vec3_reflect(vec3 r, vec3 const v, vec3 const n)
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{
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float p = 2.f*vec3_mul_inner(v, n);
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float p = 2.f * vec3_mul_inner(v, n);
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int i;
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for(i=0;i<3;++i)
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r[i] = v[i] - p*n[i];
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}
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LINMATH_H_FUNC void vec4_mul_cross(vec4 r, vec4 a, vec4 b)
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LINMATH_H_FUNC void vec4_mul_cross(vec4 r, vec4 const a, vec4 const b)
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{
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r[0] = a[1]*b[2] - a[2]*b[1];
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r[1] = a[2]*b[0] - a[0]*b[2];
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@ -93,7 +94,7 @@ LINMATH_H_FUNC void vec4_mul_cross(vec4 r, vec4 a, vec4 b)
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r[3] = 1.f;
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}
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LINMATH_H_FUNC void vec4_reflect(vec4 r, vec4 v, vec4 n)
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LINMATH_H_FUNC void vec4_reflect(vec4 r, vec4 const v, vec4 const n)
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{
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float p = 2.f*vec4_mul_inner(v, n);
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int i;
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@ -109,61 +110,59 @@ LINMATH_H_FUNC void mat4x4_identity(mat4x4 M)
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for(j=0; j<4; ++j)
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M[i][j] = i==j ? 1.f : 0.f;
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}
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LINMATH_H_FUNC void mat4x4_dup(mat4x4 M, mat4x4 N)
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LINMATH_H_FUNC void mat4x4_dup(mat4x4 M, mat4x4 const N)
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{
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int i, j;
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int i;
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for(i=0; i<4; ++i)
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for(j=0; j<4; ++j)
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M[i][j] = N[i][j];
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vec4_dup(M[i], N[i]);
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}
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LINMATH_H_FUNC void mat4x4_row(vec4 r, mat4x4 M, int i)
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LINMATH_H_FUNC void mat4x4_row(vec4 r, mat4x4 const M, int i)
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{
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int k;
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for(k=0; k<4; ++k)
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r[k] = M[k][i];
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}
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LINMATH_H_FUNC void mat4x4_col(vec4 r, mat4x4 M, int i)
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LINMATH_H_FUNC void mat4x4_col(vec4 r, mat4x4 const M, int i)
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{
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int k;
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for(k=0; k<4; ++k)
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r[k] = M[i][k];
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}
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LINMATH_H_FUNC void mat4x4_transpose(mat4x4 M, mat4x4 N)
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LINMATH_H_FUNC void mat4x4_transpose(mat4x4 M, mat4x4 const N)
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{
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// Note: if M and N are the same, the user has to
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// explicitly make a copy of M and set it to N.
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int i, j;
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for(j=0; j<4; ++j)
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for(i=0; i<4; ++i)
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M[i][j] = N[j][i];
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}
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LINMATH_H_FUNC void mat4x4_add(mat4x4 M, mat4x4 a, mat4x4 b)
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LINMATH_H_FUNC void mat4x4_add(mat4x4 M, mat4x4 const a, mat4x4 const b)
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{
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int i;
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for(i=0; i<4; ++i)
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vec4_add(M[i], a[i], b[i]);
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}
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LINMATH_H_FUNC void mat4x4_sub(mat4x4 M, mat4x4 a, mat4x4 b)
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LINMATH_H_FUNC void mat4x4_sub(mat4x4 M, mat4x4 const a, mat4x4 const b)
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{
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int i;
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for(i=0; i<4; ++i)
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vec4_sub(M[i], a[i], b[i]);
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}
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LINMATH_H_FUNC void mat4x4_scale(mat4x4 M, mat4x4 a, float k)
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LINMATH_H_FUNC void mat4x4_scale(mat4x4 M, mat4x4 const a, float k)
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{
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int i;
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for(i=0; i<4; ++i)
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vec4_scale(M[i], a[i], k);
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}
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LINMATH_H_FUNC void mat4x4_scale_aniso(mat4x4 M, mat4x4 a, float x, float y, float z)
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LINMATH_H_FUNC void mat4x4_scale_aniso(mat4x4 M, mat4x4 const a, float x, float y, float z)
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{
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int i;
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vec4_scale(M[0], a[0], x);
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vec4_scale(M[1], a[1], y);
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vec4_scale(M[2], a[2], z);
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for(i = 0; i < 4; ++i) {
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M[3][i] = a[3][i];
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}
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vec4_dup(M[3], a[3]);
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}
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LINMATH_H_FUNC void mat4x4_mul(mat4x4 M, mat4x4 a, mat4x4 b)
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LINMATH_H_FUNC void mat4x4_mul(mat4x4 M, mat4x4 const a, mat4x4 const b)
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{
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mat4x4 temp;
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int k, r, c;
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@ -174,7 +173,7 @@ LINMATH_H_FUNC void mat4x4_mul(mat4x4 M, mat4x4 a, mat4x4 b)
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}
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mat4x4_dup(M, temp);
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}
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LINMATH_H_FUNC void mat4x4_mul_vec4(vec4 r, mat4x4 M, vec4 v)
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LINMATH_H_FUNC void mat4x4_mul_vec4(vec4 r, mat4x4 const M, vec4 const v)
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{
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int i, j;
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for(j=0; j<4; ++j) {
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@ -200,13 +199,13 @@ LINMATH_H_FUNC void mat4x4_translate_in_place(mat4x4 M, float x, float y, float
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M[3][i] += vec4_mul_inner(r, t);
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}
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}
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LINMATH_H_FUNC void mat4x4_from_vec3_mul_outer(mat4x4 M, vec3 a, vec3 b)
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LINMATH_H_FUNC void mat4x4_from_vec3_mul_outer(mat4x4 M, vec3 const a, vec3 const b)
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{
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int i, j;
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for(i=0; i<4; ++i) for(j=0; j<4; ++j)
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M[i][j] = i<3 && j<3 ? a[i] * b[j] : 0.f;
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}
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LINMATH_H_FUNC void mat4x4_rotate(mat4x4 R, mat4x4 M, float x, float y, float z, float angle)
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LINMATH_H_FUNC void mat4x4_rotate(mat4x4 R, mat4x4 const M, float x, float y, float z, float angle)
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{
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float s = sinf(angle);
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float c = cosf(angle);
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@ -234,13 +233,13 @@ LINMATH_H_FUNC void mat4x4_rotate(mat4x4 R, mat4x4 M, float x, float y, float z,
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mat4x4_add(T, T, C);
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mat4x4_add(T, T, S);
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T[3][3] = 1.;
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T[3][3] = 1.f;
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mat4x4_mul(R, M, T);
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} else {
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mat4x4_dup(R, M);
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}
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}
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LINMATH_H_FUNC void mat4x4_rotate_X(mat4x4 Q, mat4x4 M, float angle)
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LINMATH_H_FUNC void mat4x4_rotate_X(mat4x4 Q, mat4x4 const M, float angle)
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{
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float s = sinf(angle);
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float c = cosf(angle);
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@ -252,7 +251,7 @@ LINMATH_H_FUNC void mat4x4_rotate_X(mat4x4 Q, mat4x4 M, float angle)
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};
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mat4x4_mul(Q, M, R);
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}
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LINMATH_H_FUNC void mat4x4_rotate_Y(mat4x4 Q, mat4x4 M, float angle)
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LINMATH_H_FUNC void mat4x4_rotate_Y(mat4x4 Q, mat4x4 const M, float angle)
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{
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float s = sinf(angle);
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float c = cosf(angle);
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@ -264,7 +263,7 @@ LINMATH_H_FUNC void mat4x4_rotate_Y(mat4x4 Q, mat4x4 M, float angle)
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};
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mat4x4_mul(Q, M, R);
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}
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LINMATH_H_FUNC void mat4x4_rotate_Z(mat4x4 Q, mat4x4 M, float angle)
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LINMATH_H_FUNC void mat4x4_rotate_Z(mat4x4 Q, mat4x4 const M, float angle)
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{
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float s = sinf(angle);
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float c = cosf(angle);
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@ -276,7 +275,7 @@ LINMATH_H_FUNC void mat4x4_rotate_Z(mat4x4 Q, mat4x4 M, float angle)
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};
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mat4x4_mul(Q, M, R);
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}
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LINMATH_H_FUNC void mat4x4_invert(mat4x4 T, mat4x4 M)
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LINMATH_H_FUNC void mat4x4_invert(mat4x4 T, mat4x4 const M)
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{
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float s[6];
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float c[6];
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@ -317,10 +316,10 @@ LINMATH_H_FUNC void mat4x4_invert(mat4x4 T, mat4x4 M)
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T[3][2] = (-M[3][0] * s[3] + M[3][1] * s[1] - M[3][2] * s[0]) * idet;
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T[3][3] = ( M[2][0] * s[3] - M[2][1] * s[1] + M[2][2] * s[0]) * idet;
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}
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LINMATH_H_FUNC void mat4x4_orthonormalize(mat4x4 R, mat4x4 M)
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LINMATH_H_FUNC void mat4x4_orthonormalize(mat4x4 R, mat4x4 const M)
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{
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mat4x4_dup(R, M);
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float s = 1.;
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float s = 1.f;
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vec3 h;
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vec3_norm(R[2], R[2]);
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@ -398,7 +397,7 @@ LINMATH_H_FUNC void mat4x4_perspective(mat4x4 m, float y_fov, float aspect, floa
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m[3][2] = -((2.f * f * n) / (f - n));
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m[3][3] = 0.f;
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}
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LINMATH_H_FUNC void mat4x4_look_at(mat4x4 m, vec3 eye, vec3 center, vec3 up)
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LINMATH_H_FUNC void mat4x4_look_at(mat4x4 m, vec3 const eye, vec3 const center, vec3 const up)
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{
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/* Adapted from Android's OpenGL Matrix.java. */
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/* See the OpenGL GLUT documentation for gluLookAt for a description */
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@ -441,24 +440,18 @@ LINMATH_H_FUNC void mat4x4_look_at(mat4x4 m, vec3 eye, vec3 center, vec3 up)
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}
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typedef float quat[4];
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#define quat_add vec4_add
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#define quat_sub vec4_sub
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#define quat_norm vec4_norm
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#define quat_scale vec4_scale
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#define quat_mul_inner vec4_mul_inner
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LINMATH_H_FUNC void quat_identity(quat q)
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{
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q[0] = q[1] = q[2] = 0.f;
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q[3] = 1.f;
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}
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LINMATH_H_FUNC void quat_add(quat r, quat a, quat b)
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{
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int i;
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for(i=0; i<4; ++i)
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r[i] = a[i] + b[i];
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}
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LINMATH_H_FUNC void quat_sub(quat r, quat a, quat b)
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{
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int i;
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for(i=0; i<4; ++i)
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r[i] = a[i] - b[i];
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}
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LINMATH_H_FUNC void quat_mul(quat r, quat p, quat q)
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LINMATH_H_FUNC void quat_mul(quat r, quat const p, quat const q)
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{
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vec3 w;
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vec3_mul_cross(r, p, q);
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@ -468,37 +461,22 @@ LINMATH_H_FUNC void quat_mul(quat r, quat p, quat q)
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vec3_add(r, r, w);
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r[3] = p[3]*q[3] - vec3_mul_inner(p, q);
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}
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LINMATH_H_FUNC void quat_scale(quat r, quat v, float s)
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{
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int i;
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for(i=0; i<4; ++i)
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r[i] = v[i] * s;
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}
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LINMATH_H_FUNC float quat_inner_product(quat a, quat b)
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{
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float p = 0.f;
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int i;
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for(i=0; i<4; ++i)
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p += b[i]*a[i];
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return p;
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}
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LINMATH_H_FUNC void quat_conj(quat r, quat q)
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LINMATH_H_FUNC void quat_conj(quat r, quat const q)
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{
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int i;
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for(i=0; i<3; ++i)
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r[i] = -q[i];
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r[3] = q[3];
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}
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LINMATH_H_FUNC void quat_rotate(quat r, float angle, vec3 axis) {
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vec3 v;
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vec3_scale(v, axis, sinf(angle / 2));
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int i;
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for(i=0; i<3; ++i)
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r[i] = v[i];
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r[3] = cosf(angle / 2);
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LINMATH_H_FUNC void quat_rotate(quat r, float angle, vec3 const axis) {
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vec3 axis_norm;
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vec3_norm(axis_norm, axis);
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float s = sinf(angle / 2);
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float c = cosf(angle / 2);
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vec3_scale(r, axis_norm, s);
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r[3] = c;
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}
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#define quat_norm vec4_norm
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LINMATH_H_FUNC void quat_mul_vec3(vec3 r, quat q, vec3 v)
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LINMATH_H_FUNC void quat_mul_vec3(vec3 r, quat const q, vec3 const v)
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{
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/*
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* Method by Fabian 'ryg' Giessen (of Farbrausch)
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@ -518,7 +496,7 @@ v' = v + q.w * t + cross(q.xyz, t)
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vec3_add(r, v, t);
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vec3_add(r, r, u);
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}
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LINMATH_H_FUNC void mat4x4_from_quat(mat4x4 M, quat q)
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LINMATH_H_FUNC void mat4x4_from_quat(mat4x4 M, quat const q)
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{
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float a = q[3];
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float b = q[0];
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@ -548,18 +526,21 @@ LINMATH_H_FUNC void mat4x4_from_quat(mat4x4 M, quat q)
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M[3][3] = 1.f;
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}
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LINMATH_H_FUNC void mat4x4o_mul_quat(mat4x4 R, mat4x4 M, quat q)
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LINMATH_H_FUNC void mat4x4o_mul_quat(mat4x4 R, mat4x4 const M, quat const q)
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{
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/* XXX: The way this is written only works for othogonal matrices. */
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/* XXX: The way this is written only works for orthogonal matrices. */
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/* TODO: Take care of non-orthogonal case. */
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quat_mul_vec3(R[0], q, M[0]);
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quat_mul_vec3(R[1], q, M[1]);
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quat_mul_vec3(R[2], q, M[2]);
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R[3][0] = R[3][1] = R[3][2] = 0.f;
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R[3][3] = 1.f;
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R[0][3] = M[0][3];
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R[1][3] = M[1][3];
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R[2][3] = M[2][3];
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R[3][3] = M[3][3]; // typically 1.0, but here we make it general
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}
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LINMATH_H_FUNC void quat_from_mat4x4(quat q, mat4x4 M)
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LINMATH_H_FUNC void quat_from_mat4x4(quat q, mat4x4 const M)
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{
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float r=0.f;
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int i;
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@ -589,7 +570,7 @@ LINMATH_H_FUNC void quat_from_mat4x4(quat q, mat4x4 M)
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q[3] = (M[p[2]][p[1]] - M[p[1]][p[2]])/(2.f*r);
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}
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LINMATH_H_FUNC void mat4x4_arcball(mat4x4 R, mat4x4 M, vec2 _a, vec2 _b, float s)
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LINMATH_H_FUNC void mat4x4_arcball(mat4x4 R, mat4x4 const M, vec2 const _a, vec2 const _b, float s)
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{
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vec2 a; memcpy(a, _a, sizeof(a));
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vec2 b; memcpy(b, _b, sizeof(b));
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@ -597,14 +578,14 @@ LINMATH_H_FUNC void mat4x4_arcball(mat4x4 R, mat4x4 M, vec2 _a, vec2 _b, float s
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float z_a = 0.;
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float z_b = 0.;
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if(vec2_len(a) < 1.f) {
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z_a = sqrtf(1.f - vec2_mul_inner(a, a));
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if(vec2_len(a) < 1.) {
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z_a = sqrtf(1. - vec2_mul_inner(a, a));
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} else {
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vec2_norm(a, a);
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}
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if(vec2_len(b) < 1.f) {
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z_b = sqrtf(1.f - vec2_mul_inner(b, b));
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if(vec2_len(b) < 1.) {
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z_b = sqrtf(1. - vec2_mul_inner(b, b));
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} else {
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vec2_norm(b, b);
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}
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@ -615,7 +596,7 @@ LINMATH_H_FUNC void mat4x4_arcball(mat4x4 R, mat4x4 M, vec2 _a, vec2 _b, float s
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vec3 c_;
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vec3_mul_cross(c_, a_, b_);
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float const angle = acosf(vec3_mul_inner(a_, b_)) * s;
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float const angle = acos(vec3_mul_inner(a_, b_)) * s;
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mat4x4_rotate(R, M, c_[0], c_[1], c_[2], angle);
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}
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#endif
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||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user