[orx-fx] convert to MPP

orx-fx/src/shaders/glsl/distort/block-repeat.frag

@@ -0,0 +1,39 @@
+in vec2 v_texCoord0;
+uniform sampler2D tex0;// input
+uniform float blockWidth;
+uniform float blockHeight;
+uniform float blockOffsetX;
+uniform float blockOffsetY;
+uniform float sourceOffsetX;
+uniform float sourceOffsetY;
+uniform float sourceScale;
+
+out vec4 o_color;
+void main() {
+    vec2 uv = v_texCoord0;
+    vec2 blockSize = vec2(blockWidth, blockHeight);
+    vec2 blockOffset = vec2(blockOffsetX, blockOffsetY);
+    vec2 blockCoord = uv / blockSize + blockOffset;
+
+    ivec2 blockIndex = ivec2(blockCoord);
+    vec2 blockUV = mod(blockCoord - blockIndex, vec2(1.0));
+    vec2 blockAspect = vec2(1.0);
+
+
+    if (blockWidth < blockHeight) {
+        blockAspect = vec2(blockWidth / blockHeight, 1.0);
+    }
+
+    if (blockHeight < blockWidth) {
+        blockAspect = vec2(1.0, blockHeight/blockWidth);
+    }
+
+    vec2 tUV = mix(blockUV * blockSize, blockUV * blockAspect, sourceScale);
+
+//    vec2 fw = fwidth(blockCoord);
+//    float f = smoothstep(0.0, 0.01, blockUV.x) * smoothstep(0.0, 0.01, blockUV.y);
+
+    vec2 sourceOffset = vec2(sourceOffsetX, sourceOffsetY);
+    vec4 c = texture(tex0, mod(tUV + sourceOffset, vec2(1.0)));
+    o_color = c;
+}