Perlin noise adjustments

bench/PerlinNoiseBench.cpp

Index: bench/PerlinNoiseBench.cpp
===================================================================
--- bench/PerlinNoiseBench.cpp	(revision 0)
+++ bench/PerlinNoiseBench.cpp	(revision 0)
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkBenchmark.h"
+#include "SkCanvas.h"
+#include "SkPerlinNoiseShader.h"
+
+class PerlinNoiseBench : public SkBenchmark {
+    SkISize fSize;
+
+public:
+    PerlinNoiseBench(void* param) : INHERITED(param) {
+        fSize = SkISize::Make(80, 80);
+    }
+
+protected:
+    virtual const char* onGetName() SK_OVERRIDE {
+        return "perlinnoise";
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        test(canvas, 0, 0, SkPerlinNoiseShader::kFractalNoise_Type,

[bsalomon, 2013/04/10 20:21:10]

this->

[bsalomon, 2013/04/10 20:21:10]

One run is enough?

[sugoi, 2013/04/10 20:28:01]

Done.

[sugoi, 2013/04/10 20:28:01]

Well, it is very simplistic, but from what I saw, it was scaling fairly linearly
in the [1-10] range for the number of octaves (the parameter that I set to 3
here), and other parameters don't affect performance significantly, so I didn't
bother adding more since it felt somewhat redundant.

+             0.1f, 0.1f, 3, 0, false);
+    }
+
+private:
+    void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
+        canvas->save();
+        canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
+                         SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
+        SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
+                                    SkIntToScalar(fSize.width()),
+                                    SkIntToScalar(fSize.height()));
+        canvas->drawRect(r, paint);
+        canvas->restore();
+    }
+
+    void test(SkCanvas* canvas, int x, int y, SkPerlinNoiseShader::Type type,
+              float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
+              bool stitchTiles) {
+        SkShader* shader = (type == SkPerlinNoiseShader::kFractalNoise_Type) ?
+            SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves,
+                                                    seed, stitchTiles ? &fSize : NULL) :
+            SkPerlinNoiseShader::CreateTubulence(baseFrequencyX, baseFrequencyY, numOctaves,
+                                                 seed, stitchTiles ? &fSize : NULL);
+        SkPaint paint;
+        paint.setShader(shader)->unref();
+        drawClippedRect(canvas, x, y, paint);

[bsalomon, 2013/04/10 20:21:10]

this->

[sugoi, 2013/04/10 20:28:01]

Done.

+    }
+
+    typedef SkBenchmark INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+DEF_BENCH( return new PerlinNoiseBench(p); )
+