PlanetEditor/grk/planet-editor/shaders/shader_pbr.vert

#version 430 core

layout(location = 0) in vec3 vertexPosition;
layout(location = 1) in vec3 vertexNormal;
layout(location = 2) in vec2 vertexTexCoord;
layout(location = 3) in vec3 vertexTangent;
layout(location = 4) in vec3 vertexBitangent;

uniform mat4 transformation;
uniform mat4 modelMatrix;

out vec3 vecNormal;
out vec3 worldPos;

out vec2 vtc;

uniform vec3 lightPos;
uniform vec3 cameraPos;
uniform vec3 sunDir;

out vec3 viewDirTS;
out vec3 lightDirTS;
out vec3 sunDirTS;

void main()
{
	worldPos = (modelMatrix * vec4(vertexPosition, 1)).xyz;
	vecNormal = (modelMatrix * vec4(vertexNormal, 0)).xyz;

	gl_Position = transformation * vec4(vertexPosition, 1.0);
	
	vtc = vec2(vertexTexCoord.x, 1.0 - vertexTexCoord.y);

	vec3 w_tangent = normalize(mat3(modelMatrix) * vertexTangent);
	vec3 w_bitangent = normalize(mat3(modelMatrix) * vertexBitangent);
	mat3 TBN = transpose(mat3(w_tangent, w_bitangent, vecNormal));
	
	vec3 V = normalize(cameraPos - worldPos);
	viewDirTS = TBN * V;
	vec3 L = normalize(lightPos - worldPos);
	lightDirTS = TBN * L;
	sunDirTS = TBN * sunDir;
}