gbuffers_terrain.fsh

#version 120

varying vec2 TexCoords;
varying vec2 LightmapCoords;
//varying vec3 Normal;
varying vec4 Color;

attribute vec3 vaNormal;
attribute vec3 at_tangent;

// The texture atlas
uniform sampler2D texture;
uniform sampler2D normals;

void main(){
    // Sample from texture atlas and account for biome color + ambien occlusion
    vec4 albedo = texture2D(texture, TexCoords) * Color;
    vec4 normal_tex = texture2D(normals, TexCoords);

    vec3 Normal;
    Normal.xy = normal_tex.xy * 2.0 - 1.0;
    Normal.z = sqrt(1.0-dot(Normal.xy, Normal.xy));

    // Create TBN matrix
    vec3 binormal = cross(at_tangent, vaNormal)
    mat3 TBN = mat3(at_tangent, binormal,vaNormal)
    Normal = TBN * Normal;
    Normal = Normal * 0.5 + 0.5;
    
    /* DRAWBUFFERS:01 */
    // Write the values to the color textures
    gl_FragData[0] = albedo;
    gl_FragData[1] = vec4(Normal, 1.0f);
    gl_FragData[2] = vec4(LightmapCoords, 0.0f, 1.0f);
}