TransformVertexShader.vertexshader

#version 330 core

// Input vertex data - different for all executions of this shader.
layout(location = 0) in vec3 vertex_position_modelspace;
layout(location = 1) in vec4 vertex_colour;
layout(location = 2) in vec2 vertex_UV;
layout(location = 3) in vec3 vertex_normal;
layout(location = 4) in vec3 vertex_tangent;
layout(location = 5) in vec3 vertex_bitangent;

// Output data - will be interpolated for each fragment.
out vec4 fragment_colour;
out vec2 UV;
out vec3 light_direction_tangent_space;
out vec3 light_direction;
out vec3 surface_normal;

uniform mat4 WORLD_VIEW_PROJECTION;
uniform mat4 MODEL;
uniform vec3 LIGHT_POSITION;

void main()
{

	// Output position of the vertex, in clip space : MODEL * WORLD_VIEW_PROJECTION * position
	gl_Position =  WORLD_VIEW_PROJECTION * MODEL * vec4(vertex_position_modelspace, 1);

	// The colour of each vertex will be interpolated
	// to produce the colour of each fragment
	fragment_colour = vertex_colour;

  UV = vertex_UV;
  light_direction = normalize(vec4(LIGHT_POSITION, 1) - MODEL * vec4(vertex_position_modelspace, 1)).xyz;
  surface_normal = vertex_normal;

  light_direction_tangent_space = light_direction;
}