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Pixelated - Shader API
Basic pixelating shader
Import from libraries.
import lib-sampler.glsl
We define the global light position
const vec3 light_pos = vec3(10.0, 10.0, 10.0);
We bind the auto param world eye position to our uniform camera_pos.
//: param auto world_eye_position uniform vec3 camera_pos;
We bind the document's channel base color to our uniform basecolor_tex.
//: param auto channel_basecolor uniform SamplerSparse basecolor_tex;
We define a new custom tweak for this shader, along with its default value. This one is used to tweak the thickness of outline, when shadowed.
//: param custom { //: "default": 0.4, //: "min": 0.0, //: "max": 1.0, //: "label": "Unlit outline thickness" //: } uniform float unlit_outline_thickness;
We define a new custom tweak for this shader, along with its default value. This one is used to tweak the thickness of outline, when lit.
//: param custom { //: "default": 0.1, //: "min": 0.0, //: "max": 1.0, //: "label": "Lit outline thickness" //: } uniform float lit_outline_thickness;
Entry point of the shader.
void shade(V2F inputs) {
We compute a few useful values.
vec3 V = normalize(camera_pos - inputs.position); vec3 N = normalize(inputs.normal); vec3 L = normalize(light_pos - inputs.position); float NdV = dot(N, V); float NdL = max(0.0, dot(N, L));
Priority is to performs the outline detection. If outline condition is reach, exit with black color.
if (NdV < mix(unlit_outline_thickness, lit_outline_thickness, NdL)) { return; } vec3 baseColor = getBaseColor(basecolor_tex, inputs.sparse_coord);
Introduce some jitter to mask size, based on base color luminance
float maskRadiusJitter = pow(dot(baseColor, vec3(0.3333)), 0.1);
Compute a mask value, based on screen space position of fragment. This will create a grid like pattern.
float mask = pow(1.0 - length(fract(gl_FragCoord.xy / 7.0) - vec2(0.5)), maskRadiusJitter * 5.0) * 5.0;
Here, we sample the base color and apply a simple diffuse attenuation
vec3 color = baseColor * NdL; diffuseShadingOutput(mask * color); }