uniform mat4 model;
uniform mat4 view_projection;
uniform vec3 light_dir;
uniform sampler2D normalmap;

#pragma MSP stage(vertex)
layout(location=0) in vec3 position;
layout(location=1) in vec3 normal;
layout(location=2) in vec3 tangent;
layout(location=3) in vec3 binormal;
layout(location=4) in vec2 texcoord;
void main()
{
	mat3 normal_matrix = mat3(model);
	mat3 tbn_matrix = mat3(normal_matrix*tangent, normal_matrix*binormal, normal_matrix*normal);
	out vec3 tbn_light_dir = tbn_matrix*light_dir;
	gl_Position = view_projection*model*vec4(position, 1);
	passthrough;
}

#pragma MSP stage(fragment)
layout(location=0) out vec4 frag_color;
void main()
{
	vec3 normal = vec3(texture(normalmap, texcoord))*2.0-1.0;
	frag_color = vec4(vec3(dot(normal, normalize(tbn_light_dir))), 1);
}

/* Expected output: vertex
layout(location=0) uniform mat4 model;
layout(location=4) uniform mat4 view_projection;
layout(location=8) uniform vec3 light_dir;
layout(location=0) in vec3 position;
layout(location=1) in vec3 normal;
layout(location=2) in vec3 tangent;
layout(location=3) in vec3 binormal;
layout(location=4) in vec2 texcoord;
layout(location=0) out vec3 tbn_light_dir;
layout(location=1) out vec2 _vs_out_texcoord;
void main()
{
  mat3 normal_matrix = mat3(model[0].xyz, model[1].xyz, model[2].xyz);
  tbn_light_dir = mat3(normal_matrix*tangent, normal_matrix*binormal, normal_matrix*normal)*light_dir;
  gl_Position = view_projection*model*vec4(position, 1.0);
  _vs_out_texcoord = texcoord;
}
*/

/* Expected output: fragment
layout(location=9, binding=25) uniform sampler2D normalmap;
layout(location=0) out vec4 frag_color;
layout(location=1) in vec2 _vs_out_texcoord;
layout(location=0) in vec3 tbn_light_dir;
void main()
{
  frag_color = vec4(vec3(dot(vec3(texture(normalmap, _vs_out_texcoord).xyz)*2.0-1.0, normalize(tbn_light_dir))), 1.0);
}
*/