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#version 330
#if defined VERTEX_SHADER
in vec3 in_position;
in vec3 in_normal;
// Per instance
in vec3 in_offset;
uniform mat4 m_proj;
uniform mat4 m_modelview;
uniform mat3 m_normal;
out vec3 normal;
out vec3 pos;
void main() {
vec4 p = m_modelview * vec4(in_position + in_offset, 1.0);
gl_Position = m_proj * p;
normal = m_normal * in_normal;
pos = p.xyz;
}
#elif defined FRAGMENT_SHADER
out vec4 fragColor;
const vec4 color = vec4(1.0);
in vec3 normal;
in vec3 pos;
void main()
{
// Just use the camera as the only light source
float l = dot(normalize(-pos), normalize(normal));
// 25% ambient, 75% light
fragColor = color * (0.25 + abs(l) * 0.75);
}
#endif
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