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[apps/shared] Halve k_parametricStepFactor to maximise cache hits

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Change-Id: Ibe3c441e4af88277d1e4594801b805336a1f3e0b
This commit is contained in:
Hugo Saint-Vignes
2020-07-30 17:59:19 +02:00
committed by Émilie Feral
parent db4a1b0265
commit 52f83eb682
3 changed files with 8 additions and 5 deletions
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7
apps/shared/continuous_function_cache.h
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@@ -17,7 +17,10 @@ private:
static constexpr int k_sizeOfCache = Ion::Display::Width;
public:
static constexpr int k_numberOfAvailableCaches = 2;
static constexpr int k_parametricStepFactor = k_sizeOfCache / int(Graph::GraphView::k_graphStepDenominator);
/* Parametric and polar functions require caching both x and y values,
* with the same k_sizeOfCache. To cover the entire range,
* k_numberOfParametricCacheablePoints is halved. */
static constexpr int k_numberOfParametricCacheablePoints = k_sizeOfCache / 2;
static void PrepareForCaching(void * fun, ContinuousFunctionCache * cache, float tMin, float tStep);
@@ -35,7 +38,7 @@ private:
*
* The value 128*FLT_EPSILON has been found to be the lowest for which all
* indices verify indexForParameter(tMin + index * tStep) = index. */
static constexpr float k_cacheHitTolerance = 128 * FLT_EPSILON;
static constexpr float k_cacheHitTolerance = 128.0f * FLT_EPSILON;
void invalidateBetween(int iInf, int iSup);
void setRange(ContinuousFunction * function, float tMin, float tStep);