cube-game-plus-plus/shader/worldVertex.vs

#version 430

layout (location = 0) in vec3 position;
layout (location = 1) in vec4 color;
layout (location = 2) in vec2 textureCoord;
layout (location = 3) in vec3 normal;

uniform mat4 projMatrix;
uniform mat4 viewMatrix;
uniform mat4 modelMatrix;

out vec3 varPosition;
out vec2 varTextureCoord;
out vec4 varColor;
out vec3 varNormal;

void main(void)
{ 
    // transforming normals must not use the fourth dimension
    varNormal = (viewMatrix * modelMatrix * vec4(normal, 0.0)).xyz;
    
    varTextureCoord = textureCoord; 
    varColor = vec4(color.xyz, 1);

    if(abs(normal.x) == 1)
    {
        varColor = varColor * 0.8;
    }
    if(abs(normal.z) == 1)
    {
        varColor = varColor * 0.9;
    }
    
    vec4 viewPos = viewMatrix * modelMatrix * vec4(position, 1.0);
    varPosition = viewPos.xyz;
    gl_Position = projMatrix * viewPos;
}