GLSL

#shader vertex
#version 330 core

layout(location = 0) in vec4 in_position;
layout(location = 2) in vec3 in_normal;

out vec3 i_normal;
out vec4 i_pos;

uniform mat4 uni_model;
uniform mat4 uni_view;
uniform mat4 uni_projection;

void main()
{
	gl_Position = uni_projection * uni_view * uni_model * in_position;
	i_normal = in_normal;
	i_pos = uni_model * in_position;
}

#shader end

#shader fragment
#version 330 core

in vec3 i_normal;
in vec4 i_pos;

out vec4 out_color;

uniform vec4 uni_color = vec4(1, 0, 0, 1);
uniform vec3 uni_lightPos = vec3(0, 0.5, 0.2);

const vec3 lightColor = vec3(1, 1, 1);

void main()
{
	float ambientStrength = 0.1;
	vec3 ambient = ambientStrength * lightColor;

	vec3 norm = normalize(i_normal);
	vec3 lightDir = normalize(uni_lightPos);

	float diff = max(dot(norm, lightDir), 0.0);
	vec3 diffuse = diff * lightColor;

	vec3 result = (ambient + diffuse) * uni_color.xyz;
	out_color = vec4(result, 1.0);
}

#shader end