demo.fs


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#version 330 core

in vec2 texture_coordinate;

uniform vec3 extra_color;

uniform sampler2D box_texture;
uniform sampler2D happy_texture;

out vec4 FragColor;

void main()
{
  FragColor = mix(texture(box_texture, texture_coordinate),
                  vec4(extra_color.xyz, 1.0),
                  0.2);
}