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/*
* gulkan
* Copyright 2020 Collabora Ltd.
* Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
* SPDX-License-Identifier: MIT
*/
#version 460 core
layout (location = 0) in vec3 positon_view;
layout (location = 1) in vec3 normal_view;
layout (location = 2) in vec4 diffuse_color;
layout (location = 0) out vec4 out_color;
const vec3 position_light = vec3 (1.0, 1.0, 1.0);
const vec3 specular_color = vec3 (1.0, 1.0, 1.0);
const float shininess = 16.0;
void
main ()
{
vec3 direction_light = normalize (position_light - positon_view);
vec3 normal = normalize (normal_view);
float lambertian = max (dot (direction_light, normal), 0.0);
float specular = 0.0;
if (lambertian > 0.0)
{
vec3 direction_reflection = reflect (-direction_light, normal);
vec3 direction_view = normalize (-positon_view);
float specular_angle =
max (dot (direction_reflection, direction_view), 0.0);
specular = pow (specular_angle, shininess);
}
out_color = vec4 (lambertian * diffuse_color.xyz +
lambertian * specular * specular_color,
1.0);
}
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