From 0541430cc073cf95c154318174e555e006e5148e Mon Sep 17 00:00:00 2001
From: Ksenia Kondrashova <kondrashova.ksenya@gmail.com>
Date: Fri, 20 Dec 2024 22:25:49 +0400
Subject: [PATCH] opacity range added

---
 example/src/shaders/dots-grid-example.tsx       |  2 ++
 .../shaders-react/src/shaders/dots-grid.tsx     |  4 ++++
 packages/shaders/src/shaders/dots-grid.ts       | 17 +++++++++++------
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/example/src/shaders/dots-grid-example.tsx b/example/src/shaders/dots-grid-example.tsx
index 8719dfe..db18703 100644
--- a/example/src/shaders/dots-grid-example.tsx
+++ b/example/src/shaders/dots-grid-example.tsx
@@ -16,6 +16,7 @@ const DotsGridExample = () => {
       gridSpacingY={50}
       strokeWidth={2}
       sizeRange={0}
+      opacityRange={0}
       style={{ position: 'fixed', width: '100%', height: '100%' }}
     />
   );
@@ -43,6 +44,7 @@ export const DotsGridWithControls = () => {
           gridSpacingY: { value: defaults.gridSpacingY, order: 6, min: 2, max: 500 },
           strokeWidth: { value: defaults.dotSize, order: 7, min: 0, max: 50 },
           sizeRange: { value: defaults.gridSpacingY, order: 8, min: 0, max: 1 },
+          opacityRange: { value: defaults.gridSpacingY, order: 9, min: 0, max: 1 },
         },
         { order: 1 }
       ),
diff --git a/packages/shaders-react/src/shaders/dots-grid.tsx b/packages/shaders-react/src/shaders/dots-grid.tsx
index a8e3cd0..f3c1a6b 100644
--- a/packages/shaders-react/src/shaders/dots-grid.tsx
+++ b/packages/shaders-react/src/shaders/dots-grid.tsx
@@ -11,6 +11,7 @@ export type DotsGridParams = {
   gridSpacingY?: number;
   strokeWidth?: number;
   sizeRange?: number;
+  opacityRange?: number;
 };
 
 export type DotsGridProps = Omit<ShaderMountProps, 'fragmentShader'> & DotsGridParams;
@@ -29,6 +30,7 @@ export const defaultPreset: DotsGridPreset = {
     gridSpacingY: 75,
     strokeWidth: 0,
     sizeRange: 0,
+    opacityRange: 0,
   },
 } as const;
 
@@ -45,6 +47,7 @@ export const DotsGrid = (props: DotsGridProps): JSX.Element => {
       u_gridSpacingY: props.gridSpacingY ?? defaultPreset.params.gridSpacingY,
       u_strokeWidth: props.strokeWidth ?? defaultPreset.params.strokeWidth,
       u_sizeRange: props.sizeRange ?? defaultPreset.params.sizeRange,
+      u_opacityRange: props.opacityRange ?? defaultPreset.params.opacityRange,
     };
   }, [
     props.colorBack,
@@ -55,6 +58,7 @@ export const DotsGrid = (props: DotsGridProps): JSX.Element => {
     props.gridSpacingY,
     props.strokeWidth,
     props.sizeRange,
+    props.opacityRange,
   ]);
 
   return <ShaderMount {...props} fragmentShader={dotsGridFragmentShader} uniforms={uniforms} />;
diff --git a/packages/shaders/src/shaders/dots-grid.ts b/packages/shaders/src/shaders/dots-grid.ts
index f5ed6d8..91707fd 100644
--- a/packages/shaders/src/shaders/dots-grid.ts
+++ b/packages/shaders/src/shaders/dots-grid.ts
@@ -7,6 +7,7 @@ export type DotsGridUniforms = {
   u_gridSpacingY: number;
   u_strokeWidth: number;
   u_sizeRange: number;
+  u_opacityRange: number;
 };
 
 /**
@@ -29,6 +30,7 @@ uniform float u_gridSpacingX;
 uniform float u_gridSpacingY;
 uniform float u_strokeWidth;
 uniform float u_sizeRange;
+uniform float u_opacityRange;
 
 uniform vec2 u_resolution;
 uniform float u_pxRatio;
@@ -47,24 +49,27 @@ void main() {
 
     vec2 grid = fract(uv / vec2(u_gridSpacingX, u_gridSpacingY)) + 1e-4;
     vec2 grid_idx = floor(uv / vec2(u_gridSpacingX, u_gridSpacingY));
-    float randomizer = hash(grid_idx);
+    float size_randomizer = hash(grid_idx);
+    float opacity_randomizer = hash(grid_idx * 2. + 1000.);
 
     vec2 center = vec2(.5) - 1e-3;
     float dist = length((grid - center) * vec2(u_gridSpacingX, u_gridSpacingY));    
 
     float edge_width = fwidth(dist);
-    float base_size = u_dotSize * (1. - randomizer * u_sizeRange);
+    float base_size = u_dotSize * (1. - size_randomizer * u_sizeRange);
     float circle_outer = smoothstep(base_size + edge_width, base_size - edge_width, dist);
     float circle_inner = smoothstep(base_size - u_strokeWidth + edge_width, base_size - u_strokeWidth - edge_width, dist);
     float stroke = clamp(circle_outer - circle_inner, 0., 1.);
 
+    float dot_opacity = 1. - opacity_randomizer * u_opacityRange;
+
     vec3 color = u_colorBack.rgb * u_colorBack.a;
-    color = mix(color, u_colorFill.rgb * u_colorFill.a, circle_inner * u_colorFill.a);
-    color = mix(color, u_colorStroke.rgb * u_colorStroke.a, stroke * u_colorStroke.a);
+    color = mix(color, u_colorFill.rgb * u_colorFill.a * dot_opacity, circle_inner * u_colorFill.a * dot_opacity);
+    color = mix(color, u_colorStroke.rgb * u_colorStroke.a * dot_opacity, stroke * u_colorStroke.a * dot_opacity);
     
     float opacity = u_colorBack.a;
-    opacity += u_colorFill.a * circle_inner;
-    opacity += u_colorStroke.a * stroke;
+    opacity += u_colorFill.a * circle_inner * dot_opacity;
+    opacity += u_colorStroke.a * stroke * dot_opacity;
     
     fragColor = vec4(color, opacity);
 }