Vignette.glsl

#include "Uniforms.glsl"
#include "Samplers.glsl"
#include "Transform.glsl"
#include "ScreenPos.glsl"

varying vec2 vScreenPos;

#ifdef COMPILEPS
  const float cRadius = 0.75;
  const float cSoftness = 0.45;
#endif

void VS()
{
    mat4 modelMatrix = iModelMatrix;
    vec3 worldPos = GetWorldPos(modelMatrix);
    gl_Position = GetClipPos(worldPos);
    vScreenPos = GetScreenPosPreDiv(gl_Position);
}

void PS() {
    vec4 Color = texture2D(sDiffMap, vScreenPos.xy);
    float dist = distance(vScreenPos.xy, vec2(0.5,0.5));
    float vignette = smoothstep(cRadius, cRadius-cSoftness, dist);
    //vignette opacity (50%)
    Color.rgb = mix(Color.rgb, Color.rgb * vignette, 0.5);
    gl_FragColor = Color;
}