rainPass now renders multiple cameras and viewports, using data from the hardware.

Added quiltPass (which uses holoplay’s quilting shader).
Added a holoplay effect version. (Versions can also now specify a preferred renderer.)

shaders/glsl/quiltPass.frag.glsl

@@ -0,0 +1,42 @@
+precision mediump float;
+uniform sampler2D quiltTexture;
+uniform float pitch;
+uniform float tilt;
+uniform float center;
+uniform float invView;
+uniform float flipImageX;
+uniform float flipImageY;
+uniform float subp;
+uniform float tileX;
+uniform float tileY;
+uniform vec2 quiltViewPortion;
+varying vec2 vUV;
+
+vec2 texArr(vec3 uvz) {
+  float z = floor(uvz.z * tileX * tileY);
+  float x = (mod(z, tileX) + uvz.x) / tileX;
+  float y = (floor(z / tileX) + uvz.y) / tileY;
+  return vec2(x, y) * quiltViewPortion;
+}
+
+float remap(float value, float from1, float to1, float from2, float to2) {
+ return (value - from1) / (to1 - from1) * (to2 - from2) + from2;
+}
+
+void main() {
+  vec4 rgb[3];
+  vec3 nuv = vec3(vUV.xy, 0.0);
+
+  // Flip UVs if necessary
+  nuv.x = (1.0 - flipImageX) * nuv.x + flipImageX * (1.0 - nuv.x);
+  nuv.y = (1.0 - flipImageY) * nuv.y + flipImageY * (1.0 - nuv.y);
+
+  for (int i = 0; i < 3; i++) {
+    nuv.z = (vUV.x + float(i) * subp + vUV.y * tilt) * pitch - center;
+    nuv.z = mod(nuv.z + ceil(abs(nuv.z)), 1.0);
+    nuv.z = (1.0 - invView) * nuv.z + invView * (1.0 - nuv.z);
+    rgb[i] = texture2D(quiltTexture, texArr(vec3(vUV.x, vUV.y, nuv.z)));
+  }
+
+  gl_FragColor = vec4(rgb[0].r, rgb[1].g, rgb[2].b, 1);
+}