diff options
author | senorblanco@chromium.org <senorblanco@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-06-22 21:01:23 +0000 |
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committer | senorblanco@chromium.org <senorblanco@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-06-22 21:01:23 +0000 |
commit | f49b429ceface4f75f5f96570ea5a8b94896529d (patch) | |
tree | 15ec6b7d0f904ba949098f286c1588209e267e09 /gm | |
parent | 7d6afdd795eb4c7ce8f5a327117cfdba5f957ddb (diff) |
Raster implementation of diffuse and specular lighting filters. Externally,
the caller instantiates a light (distant, point or spot), and an
SkDiffuseLightingFilter or SkSpecularLightingImageFilter with that light. A
Sobel edge detection filter is applied to the alpha of the incoming bitmap, and
the result is used as a height map for lighting calculations.
Review URL: http://codereview.appspot.com/6302101/
git-svn-id: http://skia.googlecode.com/svn/trunk@4314 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'gm')
-rw-r--r-- | gm/lighting.cpp | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/gm/lighting.cpp b/gm/lighting.cpp new file mode 100644 index 0000000000..2b41528a38 --- /dev/null +++ b/gm/lighting.cpp @@ -0,0 +1,91 @@ +/* + * Copyright 2012 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "gm.h" +#include "SkLightingImageFilter.h" + +#define WIDTH 330 +#define HEIGHT 220 + +namespace skiagm { + +class ImageLightingGM : public GM { +public: + ImageLightingGM() : fInitialized(false) { + this->setBGColor(0xFF000000); + } + +protected: + virtual SkString onShortName() { + return SkString("lighting"); + } + + void make_bitmap() { + fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 100, 100); + fBitmap.allocPixels(); + SkDevice device(fBitmap); + SkCanvas canvas(&device); + canvas.clear(0x00000000); + SkPaint paint; + paint.setAntiAlias(true); + paint.setColor(0xFFFFFFFF); + paint.setTextSize(SkIntToScalar(96)); + const char* str = "e"; + canvas.drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint); + } + + virtual SkISize onISize() { + return make_isize(WIDTH, HEIGHT); + } + + virtual void onDraw(SkCanvas* canvas) { + if (!fInitialized) { + make_bitmap(); + fInitialized = true; + } + SkPoint3 pointLocation(0, 0, SkIntToScalar(10)); + SkScalar azimuthRad = SkDegreesToRadians(SkIntToScalar(225)); + SkScalar elevationRad = SkDegreesToRadians(SkIntToScalar(5)); + SkPoint3 distantDirection(SkScalarMul(SkScalarCos(azimuthRad), SkScalarCos(elevationRad)), + SkScalarMul(SkScalarSin(azimuthRad), SkScalarCos(elevationRad)), + SkScalarSin(elevationRad)); + SkPoint3 spotLocation(SkIntToScalar(-10), SkIntToScalar(-10), SkIntToScalar(20)); + SkPoint3 spotTarget(SkIntToScalar(40), SkIntToScalar(40), 0); + SkScalar spotExponent = SK_Scalar1; + SkScalar cutoffAngle = SkIntToScalar(15); + SkScalar kd = SkIntToScalar(2); + SkScalar ks = SkIntToScalar(1); + SkScalar shininess = SkIntToScalar(8); + SkScalar surfaceScale = SkIntToScalar(1); + SkColor white(0xFFFFFFFF); + SkPaint paint; + paint.setImageFilter(SkLightingImageFilter::CreatePointLitDiffuse(pointLocation, white, surfaceScale, kd))->unref(); + canvas->drawSprite(fBitmap, 0, 0, &paint); + paint.setImageFilter(SkLightingImageFilter::CreateDistantLitDiffuse(distantDirection, white, surfaceScale, kd))->unref(); + canvas->drawSprite(fBitmap, 110, 0, &paint); + paint.setImageFilter(SkLightingImageFilter::CreateSpotLitDiffuse(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, kd))->unref(); + canvas->drawSprite(fBitmap, 220, 0, &paint); + paint.setImageFilter(SkLightingImageFilter::CreatePointLitSpecular(pointLocation, white, surfaceScale, ks, shininess))->unref(); + canvas->drawSprite(fBitmap, 0, 110, &paint); + paint.setImageFilter(SkLightingImageFilter::CreateDistantLitSpecular(distantDirection, white, surfaceScale, ks, shininess))->unref(); + canvas->drawSprite(fBitmap, 110, 110, &paint); + paint.setImageFilter(SkLightingImageFilter::CreateSpotLitSpecular(spotLocation, spotTarget, spotExponent, cutoffAngle, white, surfaceScale, ks, shininess))->unref(); + canvas->drawSprite(fBitmap, 220, 110, &paint); + } + +private: + typedef GM INHERITED; + SkBitmap fBitmap; + bool fInitialized; +}; + +////////////////////////////////////////////////////////////////////////////// + +static GM* MyFactory(void*) { return new ImageLightingGM; } +static GMRegistry reg(MyFactory); + +} |