#if defined(VERTEX_SHADER)
in vec3 vertexPosition;
in vec2 vertexTexCoord;
in vec3 vertexNormal;
in vec4 vertexColor;

uniform mat4 mvp;

out vec2 fragTexCoord;
out vec4 fragColor;

void main()
{
    fragTexCoord = vertexTexCoord;
    fragColor = vertexColor;

    gl_Position = mvp*vec4(vertexPosition, 1.0);
}
#elif defined(FRAG_SHADER)
in vec2 fragTexCoord;
in vec4 fragColor;

uniform sampler2D texture0;
uniform vec4 colDiffuse;

out vec4 finalColor;

void main()
{
    vec4 texelColor = texture(texture0, fragTexCoord) * colDiffuse * fragColor;
    float gray = dot(texelColor.rgb, vec3(0.299, 0.587, 0.114));
    finalColor = vec4(gray, gray, gray, texelColor.a);
}
#endif