#version 330
in vec3 vPosition;
in vec4 vColor;
in vec3 vNormal;
in vec3 tangent;
in vec3 bitangent;
in vec2 vTexCoord;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

out vec3 defNormal;
out vec2 texCoord;

uniform vec3 vLightPos;
uniform vec3 vViewPos;

out vec3 lightPos;
out vec3 viewPos;
out vec3 fragPos;

void main() {
	vec4 pos = model * vec4(vPosition, 1.f);
	texCoord = vTexCoord;

	//tangent space stuff
	vec3 T = normalize(vec3(model * vec4(tangent,   0.0)));
	vec3 B = normalize(vec3(model * vec4(bitangent, 0.0)));
	vec3 N = normalize(vec3(model * vec4(vNormal,    0.0)));
	// convert TBN to world->tangent space
	mat3 TBN = transpose(mat3(T, B, N));

	lightPos = TBN * vLightPos;
	viewPos = TBN * vViewPos;
	fragPos = TBN * vec3(pos);
	defNormal = TBN * mat3(transpose(inverse(model))) * vNormal;
	
	gl_Position = projection * view * pos;
}