Vertex Shader

Changes in the vertex shader are straightforward by adding the texture coordinate input and ouput.

Add the texture coordinate attribute input

in layout(location=0) vec3 aPos;
in layout(location=1) vec3 aNormal;
// added for LabA07
in layout(location=2) vec2 aTexCoord;

Adding the texure coordinate output

out vec3 normal;
out vec3 fragPos;
// added for LabA07
out vec2 texCoord;

transfer texcoord from input to output in main()

void main()
{
    ...
    // added for LabA07
    texCoord = aTexCoord;
}

Full Source Code of the Vertex Shader

// texblinn.vert : Blinn-Phong shader with texture support
#version 410

in layout(location=0) vec3 aPos;
in layout(location=1) vec3 aNormal;
// added for LabA07
in layout(location=2) vec2 aTexCoord;

// M V P matrices
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

out vec3 normal;
out vec3 fragPos;
// added for LabA07
out vec2 texCoord;

void main()
{
    // homogeneous coordinate
    gl_Position = projection * view * model * vec4(aPos, 1.0); 
    
    fragPos = vec3(model * vec4(aPos, 1.0));

    // convert 4x4 modelling matrix to 3x3
    mat3 normalMatrix = mat3(model);
    
    // output normal to the fragment shader
    // !! only correct for rigid body transforms
    normal = normalMatrix * aNormal;

    // added for LabA07
    texCoord = aTexCoord;
}