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alpha blending fix in scatterplots (#2033)

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* explicitly specify alpha blending; rename NaN flag to accurately describe function

* fix incorret dest alpha blending function
This commit is contained in:
Bruce Martin
2021-02-05 09:34:37 -08:00
committed by GitHub
parent d821f0eac9
commit 3aef21f76c
5 changed files with 59 additions and 28 deletions
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client/src/util/glHelpers.js
+10 -4
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@@ -8,18 +8,24 @@ PointFlags:
We want a bitmask-like flag structure, but due to webgl limitations
must emulate it with floats.
Supported flags are:
selected: the point is currently selected
highlight: the point is currently highlighted
background: the point is background information
*/
// for JS
export const flagSelected = 1;
export const flagNaN = 2;
export const flagBackground = 2;
export const flagHighlight = 4;
// for GLSL
export const glPointFlags = `
const float flagSelected = 1.;
const float flagNaN = 2.;
const float flagBackground = 2.;
const float flagHighlight = 4.;
bool isLowBitSet(float f) {
@@ -32,12 +38,12 @@ export const glPointFlags = `
}
void getFlags(in float flag,
out bool isNaN,
out bool isBackground,
out bool isSelected,
out bool isHighlight) {
isSelected = isLowBitSet(flag);
flag = shiftRightOne(flag);
isNaN = isLowBitSet(flag);
isBackground = isLowBitSet(flag);
flag = shiftRightOne(flag);
isHighlight = isLowBitSet(flag);
}