vert_shader_TBN

#version 450

layout(push_constant) uniform MVPConst{
    mat4 m;
    mat4 n;
} mvp;

layout(binding = 0) uniform UBO{
	mat4  vM;
    mat4  cM;
    mat4  pM;
    vec4  lP;
    float time;
    uvec2 res;
    float varA;
} ubo;

layout(location = 0) in vec3 vert_pos;
layout(location = 1) in vec2 vert_uvco;
layout(location = 2) in vec3 vert_norm;
layout(location = 3) in vec3 vert_tangent;
layout(location = 4) in vec3 vert_bitangent;

layout(location = 0) out vec2 frag_uvco;
layout(location = 1) out vec3 frag_norm;
layout(location = 2) out vec3 frag_wpos;
layout(location = 3) out vec3 frag_light_dir;
layout(location = 4) out mat3 frag_TBN;

void main(){
    vec4     wP = mvp.m * vec4(vert_pos,1.0f);
    mat4    mat = ubo.pM * ubo.vM;
    gl_Position = mat * wP;

    frag_norm = mat3(mvp.n) * vert_norm;
    frag_uvco = vert_uvco;
    frag_wpos = wP.xyz;

    frag_light_dir = ubo.lP.xyz - wP.xyz;

    vec3 T = normalize(vec3(mvp.m * vec4(vert_tangent,  0.)));
    vec3 B = normalize(vec3(mvp.m * vec4(vert_bitangent,0.)));
    vec3 N = normalize(vec3(mvp.m * vec4(vert_norm,     0.)));
    mat3 TBN = mat3(T, B, N);

    frag_TBN = TBN;
}