From b0a8bb642f919eaa0c36b9d861c47e0cc4a99440 Mon Sep 17 00:00:00 2001
From: davidovski <david@davidovski.xyz>
Date: Mon, 22 Apr 2024 17:32:17 +0100
Subject: use grass

---
 shaders/bloom.kage    | 43 +++++++++++++++++++++++++++++++++++++++++++
 shaders/clouds.kage   | 11 +++++++----
 shaders/none.kage     |  4 ++--
 shaders/vcr_lite.kage | 33 +++++++++++++++++++++++++++++++++
 4 files changed, 85 insertions(+), 6 deletions(-)
 create mode 100644 shaders/bloom.kage
 create mode 100644 shaders/vcr_lite.kage

(limited to 'shaders')

diff --git a/shaders/bloom.kage b/shaders/bloom.kage
new file mode 100644
index 0000000..fc987b1
--- /dev/null
+++ b/shaders/bloom.kage
@@ -0,0 +1,43 @@
+//go:build ignore
+//kage:unit pixels
+
+package main
+
+const THRESHOLD = .9
+const DIRECTIONS = 30.0  // BLUR DIRECTIONS (Default 16.0 - More is better but slower)
+const QUALITY = 12.0      // BLUR QUALITY (Default 4.0 - More is better but slower)
+const SIZE = 5.0         // BLUR SIZE (Radius)
+const PI = 6.28318530718 // Pi*2
+const OPACITY = 0.21
+
+
+var Time float
+var NoiseOffset float
+
+func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
+    uv := srcPos
+    
+    average := vec3(0.0)
+    radius := SIZE / 2
+    
+    amount := 0.0
+    for d:=0.0; d<PI; d+=PI/DIRECTIONS{
+		for i:=1.0/QUALITY; i<=1.0; i+=1.0/QUALITY{
+            t := imageSrc0UnsafeAt(uv + vec2(cos(d),sin(d))*radius*log(i)).rgb
+
+            brightness := dot(t.rgb, vec3(0.2126, 0.7152, 0.0722))
+            if brightness > THRESHOLD {
+                average += t
+                amount += 1.0
+            }
+        }
+    } 
+    
+    col :=  imageSrc0UnsafeAt(uv).rgb
+    if amount > 0 {
+        col += (average / amount) * OPACITY
+    }
+    
+    return vec4(col,1.0)
+}
+
diff --git a/shaders/clouds.kage b/shaders/clouds.kage
index 26597e5..62a0ae0 100644
--- a/shaders/clouds.kage
+++ b/shaders/clouds.kage
@@ -13,6 +13,7 @@ const cloudlight = 0.3
 const cloudcover = 0.2
 const cloudalpha = 8.0
 const skytint = 0.5
+const colorDepth = 64
 
 func rand(co vec2) float {
     return fract(sin(dot(co.xy, vec2(12.9898,-78.233))) * 43758.5453)
@@ -59,10 +60,11 @@ func fbm(n vec2) float {
 
 func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
     m := mat2(1.6,  1.2, -1.2,  1.6)
-    skycolour1 := vec3(0.45, 0.57, 0.66)
-    skycolour2 := vec3(0.55, 0.77, 0.86)
+    skycolour := vec3(0.68, 0.81, 0.86)
+    //skycolour2 := vec3(0.55, 0.77, 0.86)
+
+    p := floor(srcPos.xy) / imageSrc0Size().xy;
 
-    p := srcPos.xy / imageSrc0Size().xy;
 	uv := p*vec2(imageSrc0Size().x/imageSrc0Size().y,1.0);    
     time := Time * speed
     q := fbm(uv * cloudscale * 0.5)
@@ -120,12 +122,13 @@ func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
 	
     c += c1
 
-    skycolour := mix(skycolour2, skycolour1, p.y);
+    //skycolour := mix(skycolour2, skycolour1, 0);
     cloudcolour := vec3(1.1, 1.1, 0.9) * clamp((clouddark + cloudlight*c), 0.0, 1.0);
    
     f = cloudcover + cloudalpha*f*r;
     
     result := mix(skycolour, clamp(skytint * skycolour + cloudcolour, 0.0, 1.0), clamp(f + c, 0.0, 1.0));
+    result = floor(result*colorDepth)/colorDepth
     
 	return vec4( result, 1.0 );
 }
diff --git a/shaders/none.kage b/shaders/none.kage
index 3eccc50..941070d 100644
--- a/shaders/none.kage
+++ b/shaders/none.kage
@@ -5,8 +5,8 @@
 package main
 
 var Time float
-var Cursor vec2
+var NoiseOffset float
 
 func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
-    return imageSrc2UnsafeAt(srcPos);
+    return imageSrc0UnsafeAt(srcPos)
 }
diff --git a/shaders/vcr_lite.kage b/shaders/vcr_lite.kage
new file mode 100644
index 0000000..405195c
--- /dev/null
+++ b/shaders/vcr_lite.kage
@@ -0,0 +1,33 @@
+//go:build ignore
+
+//kage:unit pixels
+
+package main
+
+var Time float
+var NoiseOffset float
+
+const noiseX = 840.0
+const noiseY = 840.0
+const speed = 0.01
+
+const colorOffsetIntensity = 0.1
+
+func rand(co vec2) float {
+    return fract(sin(dot(co.xy, vec2(12.9898,78.233))) * 43758.5453)
+}
+
+
+func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
+    time := Time * speed
+    uv := srcPos / imageSrc0Size()
+
+    uv.x = uv.x + (rand(vec2(time,srcPos.y)) - 0.5) / (noiseX); 
+    uv.y = uv.y + (rand(vec2(time))-0.5) / (noiseY)
+    offsetR := vec2(0.006 * sin(time), 0.0) * colorOffsetIntensity
+    offsetG := vec2(0.0073 * (cos(time * 0.97)), 0.0) * colorOffsetIntensity
+    r := imageSrc0UnsafeAt((uv+offsetR) * imageSrc0Size()).r
+    g := imageSrc0UnsafeAt((uv+offsetG) * imageSrc0Size()).g
+    b := imageSrc0UnsafeAt(uv * imageSrc0Size()).b
+    return vec4(r, g, b, 1.0)
+}
-- 
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