advanced_opengl/1.depth/shaders/depth.frag


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

#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);
}