converted to sksl

Author: HinTak

shadowtoy/Mouse "Tutorial".sksl

@@ -0,0 +1,43 @@
+uniform vec3      iResolution;           // viewport resolution (in pixels)
+uniform float     iTime;                 // shader playback time (in seconds)
+uniform float     iTimeDelta;            // render time (in seconds)
+uniform float     iFrameRate;            // shader frame rate
+uniform int       iFrame;                // shader playback frame
+uniform float     iChannelTime[4];       // channel playback time (in seconds)
+uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)
+uniform vec4      iMouse;                // mouse pixel coords. xy: current (if MLB down), zw: click
+uniform vec4      iDate;                 // (year, month, day, time in seconds)
+uniform float     iSampleRate;           // sound sample rate (i.e., 44100)
+
+vec4 main(vec2 fragCoord)
+{
+    vec3 col = vec3(0.);
+
+    //Draw a red cross where the mouse button was last down.
+    if(abs(iMouse.x-fragCoord.x) < 4.) {
+        col = vec3(1.,0.,0.);
+    }
+    if(abs(iMouse.y-fragCoord.y) < 4.) {
+        col = vec3(1.,0.,0.);
+    }
+    
+    //If the button is currently up, (iMouse.z, iMouse.w) is where the mouse
+    //was when the button last went down.
+    if(abs(iMouse.z-fragCoord.x) < 2.) {
+        col = vec3(0.,0.,1.);
+    }
+    if(abs(iMouse.w-fragCoord.y) < 2.) {
+        col = vec3(0.,0.,1.);
+    }
+    
+    //If the button is currently down, (-iMouse.z, -iMouse.w) is where
+    //the button was when the click occurred.
+    if(abs(-iMouse.z-fragCoord.x) < 2.) {
+        col = vec3(0.,1.,0.);
+    }
+    if(abs(-iMouse.w-fragCoord.y) < 2.) {
+        col = vec3(0.,1.,0.);
+    }
+    
+    return vec4(col, 1.0);
+}