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Improve Stretch shader performance

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Refactor stretch shader to return within
conditional blocks instead of falling
through to main function body.
Improves performance on coral by approximately 60%
~600 fps to ~1k fps on non-surfaceview case
~300 fps to 500 fps on surfaceview case

Bug: 187718492
Test: manual
Change-Id: Ida0d0dee9c94b0ac210a024708100283fecc2a5c
This commit is contained in:
Nader Jawad
2021-05-13 19:08:04 -07:00
parent 5ac4488fec
commit 91a55b613d
1 changed files with 28 additions and 32 deletions
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60
libs/hwui/effects/StretchEffect.cpp
View File

@@ -115,38 +115,37 @@ static const SkString stretchShader = SkString(R"(
float distanceDiff,
float interpolationStrength
) {
float outPos = inPos;
if (overscroll > 0) {
if (inPos <= uStretchAffectedDist) {
outPos = computeOverscrollStart(
inPos,
overscroll,
uStretchAffectedDist,
uInverseStretchAffectedDist,
distanceStretched,
interpolationStrength
);
} else if (inPos >= distanceStretched) {
outPos = distanceDiff + inPos;
}
if (inPos <= uStretchAffectedDist) {
return computeOverscrollStart(
inPos,
overscroll,
uStretchAffectedDist,
uInverseStretchAffectedDist,
distanceStretched,
interpolationStrength
);
} else {
return distanceDiff + inPos;
}
if (overscroll < 0) {
float stretchAffectedDist = 1. - uStretchAffectedDist;
if (inPos >= stretchAffectedDist) {
outPos = computeOverscrollEnd(
inPos,
overscroll,
stretchAffectedDist,
uStretchAffectedDist,
uInverseStretchAffectedDist,
distanceStretched,
interpolationStrength
);
} else if (inPos < stretchAffectedDist) {
outPos = -distanceDiff + inPos;
}
} else if (overscroll < 0) {
float stretchAffectedDist = 1. - uStretchAffectedDist;
if (inPos >= stretchAffectedDist) {
return computeOverscrollEnd(
inPos,
overscroll,
stretchAffectedDist,
uStretchAffectedDist,
uInverseStretchAffectedDist,
distanceStretched,
interpolationStrength
);
} else {
return -distanceDiff + inPos;
}
return outPos;
} else {
return inPos;
}
}
vec4 main(vec2 coord) {
@@ -155,12 +154,9 @@ static const SkString stretchShader = SkString(R"(
float inV = coord.y / viewportHeight;
float outU;
float outV;
float stretchIntensity;
// Add the normalized scroll position within scrolling list
inU += uScrollX;
inV += uScrollY;
outU = inU;
outV = inV;
outU = computeOverscroll(
inU,
uOverscrollX,