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#include "vecmath.h"
#include <math.h>
#include <stdio.h>
Vec3f vec3f_sub(Vec3f lhs, Vec3f rhs) {
return (Vec3f){
.x = lhs.x - rhs.x,
.y = lhs.y - rhs.y,
.z = lhs.z - rhs.z,
};
}
Vec3f vec3f_add(Vec3f lhs, Vec3f rhs) {
return (Vec3f){
.x = lhs.x + rhs.x,
.y = lhs.y + rhs.y,
.z = lhs.z + rhs.z,
};
}
float vec3f_dot(Vec3f lhs, Vec3f rhs) {
return lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z;
}
Vec3f vec3f_neg(Vec3f v) {
return (Vec3f){-v.x, -v.y, -v.z};
}
Vec3f vec3f_normalize(Vec3f vec) {
float len = sqrt(vec3f_dot(vec, vec));
return (Vec3f){vec.x/len, vec.y/len, vec.z/len};
}
Vec3f vec3f_mul(float a, Vec3f v) {
return (Vec3f){v.x * a, v.y * a, v.z * a};
}
Color icolor(int32_t rgb) {
int r = (rgb >> 16) & 0xff;
int g = (rgb >> 8) & 0xff;
int b = rgb & 0xff;
return (Color){.r = r/255.0, .g = g/255.0, .b = b/255.0};
}
void vec3f_show(const char *name, Vec3f v) {
printf("%s(%f,%f,%f)\n", name, v.x, v.y, v.z);
}
Color pixel_avg4(Color pixels[4]) {
float r = 0,g = 0,b = 0;
for (int i = 0; i < 4; i++) {
r += pixels[i].r;
g += pixels[i].g;
b += pixels[i].b;
}
return (Color) {r/4.0, g/4.0, b/4.0};
}
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