From 34eb32071137ce2903ec650fac50b1ed42b01cd8 Mon Sep 17 00:00:00 2001
From: FMS-Cat <yutaka.obuchi@gmail.com>
Date: Sun, 14 Mar 2021 12:13:32 +0900
Subject: [PATCH] feature: even more flicky patterns

---
 src/shaders/flicky-particles-render.frag | 20 +++++++++++++-----
 src/shaders/flicky-particles-render.vert | 27 +++++++++++++-----------
 2 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/src/shaders/flicky-particles-render.frag b/src/shaders/flicky-particles-render.frag
index c88a8a9..040d7ec 100644
--- a/src/shaders/flicky-particles-render.frag
+++ b/src/shaders/flicky-particles-render.frag
@@ -7,11 +7,12 @@ const int MTL_UNLIT = 1;
 const int MODE_RECT = 0;
 const int MODE_GRID = 1;
 const int MODE_CIRCLE = 2;
-const int MODE_TAMBO = 3;
-const int MODE_C = 4;
-const int MODE_THEREFORE = 5;
-const int MODE_SPEEN = 6;
-const int MODES = 7;
+const int MODE_SLASHER = 3;
+const int MODE_TAMBO = 4;
+const int MODE_C = 5;
+const int MODE_THEREFORE = 6;
+const int MODE_SPEEN = 7;
+const int MODES = 8;
 const float PI = 3.14159265;
 const float TAU = 6.28318531;
 
@@ -23,6 +24,7 @@ const float TAU = 6.28318531;
 in float vLife;
 in float vMode;
 in vec2 vUv;
+in vec2 vSize;
 in vec3 vNormal;
 in vec4 vPosition;
 in vec4 vDice;
@@ -57,6 +59,7 @@ void main() {
 
   vec2 uv = vUv;
   vec2 deltaUv = abs( vec2( dFdx( uv.x ), dFdy( uv.y ) ) );
+  vec2 p = ( uv * 2.0 - 1.0 ) * vSize;
 
   vec3 color = vec3( 0.0 );
 
@@ -100,6 +103,13 @@ void main() {
 
     color = vec3( 1.0 );
 
+  } else if ( mode == MODE_SLASHER ) {
+    float shape = step( 0.0, sin( 40.0 * ( p.x + p.y + 0.3 * time ) ) );
+
+    if ( shape < 0.5 ) { discard; }
+
+    color = vec3( 1.0 );
+
   } else if ( mode == MODE_TAMBO ) { // 田
     if ( vLife < 0.7 ) { discard; }
 
diff --git a/src/shaders/flicky-particles-render.vert b/src/shaders/flicky-particles-render.vert
index dc9ed07..34a348b 100644
--- a/src/shaders/flicky-particles-render.vert
+++ b/src/shaders/flicky-particles-render.vert
@@ -3,11 +3,12 @@
 const int MODE_RECT = 0;
 const int MODE_GRID = 1;
 const int MODE_CIRCLE = 2;
-const int MODE_TAMBO = 3;
-const int MODE_C = 4;
-const int MODE_THEREFORE = 5;
-const int MODE_SPEEN = 6;
-const int MODES = 7;
+const int MODE_SLASHER = 3;
+const int MODE_TAMBO = 4;
+const int MODE_C = 5;
+const int MODE_THEREFORE = 6;
+const int MODE_SPEEN = 7;
+const int MODES = 8;
 const float HUGE = 9E16;
 const float PI = 3.14159265;
 const float TAU = 6.283185307;
@@ -25,6 +26,7 @@ in vec2 position;
 out float vLife;
 out float vMode;
 out vec2 vUv;
+out vec2 vSize;
 out vec3 vNormal;
 out vec4 vPosition;
 out vec4 vDice;
@@ -67,23 +69,24 @@ void main() {
   // == compute size ===============================================================================
   vPosition = vec4( tex0.xyz, 1.0 );
 
-  vec2 size;
-
   if ( mode == MODE_RECT ) {
-    size = 1.0 * dice.xy;
+    vSize = 1.0 * dice.xy;
 
   } else if ( mode == MODE_GRID ) {
-    size = vec2( 0.25 );
+    vSize = vec2( 0.25 );
 
   } else if ( mode == MODE_CIRCLE ) {
-    size = vec2( 3.0 * dice.x * dice.x );
+    vSize = vec2( 3.0 * dice.x * dice.x );
+
+  } else if ( mode == MODE_SLASHER ) {
+    vSize = vec2( 0.6, 0.2 ) * dice.xy;
 
   } else if ( mode == MODE_TAMBO || mode == MODE_C || mode == MODE_THEREFORE || mode == MODE_SPEEN ) {
-    size = vec2( 0.2 * dice.x );
+    vSize = vec2( 0.2 * dice.x );
 
   }
 
-  vec2 shape = position * size;
+  vec2 shape = position * vSize;
 
   vPosition.xy += shape;