Create linear algebra module

linear_alg.h

@@ -0,0 +1,76 @@
+#ifndef LINEAR_ALG_H
+#define LINEAR_ALG_H
+
+#define PI 3.14159265358979323846264
+
+typedef struct {
+	float x, y, z;
+} vec3_t;
+
+typedef struct {
+	float x, y, z, w;
+} vec4_t;
+
+typedef struct {
+	vec4_t x, y, z, w;
+} mat4_t;
+
+#define MAT4_ID \
+	{ \
+		{ 1, 0, 0, 0 }, \
+		{ 0, 1, 0, 0 }, \
+		{ 0, 0, 1, 0 }, \
+		{ 0, 0, 0, 1 }, \
+	}
+
+#define MAT4_SCALE(sf) \
+	{ \
+		{ sf, 0, 0, 0 }, \
+		{ 0, sf, 0, 0 }, \
+		{ 0, 0, sf, 0 }, \
+		{ 0, 0, 0, 1 }, \
+	}
+
+#define MAT4_TRANSLATE(x, y, z) \
+	{ \
+		{ 1, 0, 0, 0 }, \
+		{ 0, 1, 0, 0 }, \
+		{ 0, 0, 1, 0 }, \
+		{ x, y, z, 1 }, \
+	}
+
+#define MAT4_ROTATE_X(a) \
+	{ \
+		{ 1, 0, 0, 0 }, \
+		{ 0, cosf(a), sinf(a), 0 }, \
+		{ 0, -sinf(a), cosf(a), 0 }, \
+		{ 0, 0, 0, 1 }, \
+	}
+
+#define MAT4_ROTATE_Y(a) \
+	{ \
+		{ cosf(a), 0, -sinf(a), 0 }, \
+		{ 0, 1, 0, 0 }, \
+		{ sinf(a), 0, cosf(a), 0 }, \
+		{ 0, 0, 0, 1 }, \
+	}
+
+#define MAT4_ROTATE_Z(a) \
+	{ \
+		{ cosf(a), sinf(a), 0, 0 }, \
+		{ -sinf(a), cosf(a), 0, 0 }, \
+		{ 0, 0, 1, 0 }, \
+		{ 0, 0, 0, 1 }, \
+	}
+
+vec3_t vec3_sub(vec3_t v, vec3_t u);
+float vec3_len(vec3_t v);
+vec3_t vec3_norm(vec3_t v);
+float vec3_dot(vec3_t v, vec3_t u);
+vec3_t vec3_cross(vec3_t v, vec3_t u);
+
+mat4_t mat4_mul(mat4_t m, mat4_t n);
+mat4_t mat4_lookat(vec3_t camera, vec3_t target, vec3_t up);
+mat4_t mat4_perspective(float aspect, float fov, float near, float far);
+
+#endif