79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
#ifndef LINEAR_ALG_H
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#define LINEAR_ALG_H
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#define PI 3.14159265358979323846264
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typedef struct {
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float x, y, z;
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} vec3_t;
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typedef struct {
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float x, y, z, w;
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} vec4_t;
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typedef struct {
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vec4_t x, y, z, w;
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} mat4_t;
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// clang-format off
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#define MAT4_ID \
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(mat4_t) { \
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{ 1, 0, 0, 0 }, \
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{ 0, 1, 0, 0 }, \
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{ 0, 0, 1, 0 }, \
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{ 0, 0, 0, 1 }, \
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}
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#define MAT4_SCALE(sf) \
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(mat4_t) { \
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{ sf, 0, 0, 0 }, \
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{ 0, sf, 0, 0 }, \
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{ 0, 0, sf, 0 }, \
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{ 0, 0, 0, 1 }, \
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}
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#define MAT4_TRANSLATE(x, y, z) \
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(mat4_t) { \
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{ 1, 0, 0, 0 }, \
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{ 0, 1, 0, 0 }, \
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{ 0, 0, 1, 0 }, \
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{ x, y, z, 1 }, \
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}
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#define MAT4_ROTATE_X(a) \
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(mat4_t) { \
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{ 1, 0, 0, 0 }, \
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{ 0, cosf(a), sinf(a), 0 }, \
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{ 0, -sinf(a), cosf(a), 0 }, \
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{ 0, 0, 0, 1 }, \
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}
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#define MAT4_ROTATE_Y(a) \
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(mat4_t) { \
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{ cosf(a), 0, -sinf(a), 0 }, \
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{ 0, 1, 0, 0 }, \
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{ sinf(a), 0, cosf(a), 0 }, \
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{ 0, 0, 0, 1 }, \
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}
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#define MAT4_ROTATE_Z(a) \
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(mat4_t) { \
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{ cosf(a), sinf(a), 0, 0 }, \
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{ -sinf(a), cosf(a), 0, 0 }, \
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{ 0, 0, 1, 0 }, \
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{ 0, 0, 0, 1 }, \
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}
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// clang-format on
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vec3_t vec3_sub(vec3_t v, vec3_t u);
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float vec3_len(vec3_t v);
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vec3_t vec3_norm(vec3_t v);
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float vec3_dot(vec3_t v, vec3_t u);
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vec3_t vec3_cross(vec3_t v, vec3_t u);
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mat4_t mat4_mul(mat4_t m, mat4_t n);
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mat4_t mat4_lookat(vec3_t camera, vec3_t target, vec3_t up);
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mat4_t mat4_perspective(float aspect, float fov, float near, float far);
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#endif
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