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main.js

@@ -65,7 +65,22 @@ var aBuffer = {
 
 var alphaToCoverage = {
     name: 'Alpha-to-Coverage',
-    description: 'Visualizes how alpha-to-coverage translates alpha values into sample coverage on your device. This varies per device; for example, not all devices guarantee that once a sample pops in, it will stay; some devices repeat at 2x2 pixels, others at 4x4; etc. The circles show the 4 samples of each pixel; the background checkerboard shows where the pixels are.',
+    description: `
+Alpha-to-coverage is an alternative to alpha testing and alpha blending. See:
+<https://bgolus.medium.com/anti-aliased-alpha-test-the-esoteric-alpha-to-coverage-8b177335ae4f>
+
+This sample visualizes how alpha-to-coverage translates alpha values into sample
+coverage on your device. It draws two full-screen quads into a 4-sample
+texture, each with the configured color and alpha value. Then, it visualizes the
+contents of the resulting 4-sample texture: the circles show the 4 samples of
+each texel; the background shows the "resolved" results (average of 4 samples).
+
+The algorithm that converts alpha to a coverage sample mask varies per device.
+This results in different average "blending" proportions between the black
+background, the first draw, and the second draw.
+Device differences include different tile sizes (e.g. 1x1, 2x2, or 4x4),
+"moving" samples (or not) around with in the tile as alpha increases, etc.
+`,
     filename: "sample/alphaToCoverage",
     sources: [
         { path: 'main.ts' },