vulkan_loadobjfile/Utils.cpp at master · CarvellWakeman/vulkan_loadobjfile · GitHub

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#include <cmath>
#include "./Utils.h"

float* Array3(float a, float b, float c)
{
	static float array[4];
	array[0] = a;
	array[1] = b;
	array[2] = c;
	array[3] = 1.;
	return array;
}

// Math helper functions //
float Dot(glm::vec3 v1, glm::vec3 v2)
{
	return v1.x * v2.x + v1.y * v2.y + v1.z * v2.z;
}

void Cross(glm::vec3 v1, glm::vec3 v2, glm::vec3 vout)
{
	glm::vec3 tmp;
	tmp[0] = v1[1] * v2[2] - v2[1] * v1[2];
	tmp[1] = v2[0] * v1[2] - v1[0] * v2[2];
	tmp[2] = v1[0] * v2[1] - v2[0] * v1[1];
	vout[0] = tmp[0];
	vout[1] = tmp[1];
	vout[2] = tmp[2];
}

float Unit(float v[3])
{
	float dist;

	dist = v[0] * v[0] + v[1] * v[1] + v[2] * v[2];

	if (dist > 0.0)
	{
		dist = sqrt(dist);
		v[0] /= dist;
		v[1] /= dist;
		v[2] /= dist;
	}

	return dist;
}

float Unit(glm::vec3 vin, glm::vec3 vout)
{
	float dist = vin[0] * vin[0] + vin[1] * vin[1] + vin[2] * vin[2];
	if (dist > 0.0)
	{
		dist = sqrt(dist);
		vout[0] = vin[0] / dist;
		vout[1] = vin[1] / dist;
		vout[2] = vin[2] / dist;
	}
	else
	{
		vout[0] = vin[0];
		vout[1] = vin[1];
		vout[2] = vin[2];
	}
	return dist;
}

glm::vec3 Unit(glm::vec3 vin)
{
	float dist = vin.x * vin.x + vin.y * vin.y + vin.z * vin.z;
	if (dist > 0.0)
	{
		dist = sqrt(dist);
		return glm::vec3(vin.x / dist, vin.y / dist, vin.z / dist);
	}
	else
	{
		return vin;
	}
}


void HsvRgb(float hsv[3], float rgb[3])
{
	// guarantee valid input:

	float h = hsv[0] / 60.f;
	while (h >= 6.)	h -= 6.;
	while (h <  0.) 	h += 6.;

	float s = hsv[1];
	if (s < 0.)
		s = 0.;
	if (s > 1.)
		s = 1.;

	float v = hsv[2];
	if (v < 0.)
		v = 0.;
	if (v > 1.)
		v = 1.;

	// if sat==0, then is a gray:

	if (s == 0.0)
	{
		rgb[0] = rgb[1] = rgb[2] = v;
		return;
	}

	// get an rgb from the hue itself:

	float i = floor(h);
	float f = h - i;
	float p = v * (1.f - s);
	float q = v * (1.f - s*f);
	float t = v * (1.f - (s * (1.f - f)));

	float r, g, b;			// red, green, blue
	switch ((int)i)
	{
	case 0:
		r = v;	g = t;	b = p;
		break;

	case 1:
		r = q;	g = v;	b = p;
		break;

	case 2:
		r = p;	g = v;	b = t;
		break;

	case 3:
		r = p;	g = q;	b = v;
		break;

	case 4:
		r = t;	g = p;	b = v;
		break;

	case 5:
		r = v;	g = p;	b = q;
		break;
	}


	rgb[0] = r;
	rgb[1] = g;
	rgb[2] = b;
}

float Dist(glm::vec3 target, glm::vec3 position) {
	return sqrt(pow((target.x - position.x), 2) + pow((target.y - position.y), 2) + pow((target.z - position.z), 2));
}