advanced_opengl/1.depth/shaders/depth.fs


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#version 330 core

out vec4 frag_color;

in vec2 tex_coords;

uniform sampler2D our_texture;

float near = 0.1;
float far = 100.0;

float
linearize_depth(float depth)
{
    float ndc_z = 2.0*depth-1.0;
    return((2.0*near*far)/(far+near-ndc_z*(far-near)));
}

void
main(void)
{
    /* 
    frag_color = texture(our_texture, tex_coords);
    */
    float depth = linearize_depth(gl_FragCoord.z)/far;
    frag_color = vec4(vec3(depth), 1.0);
}