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/*
* Copyright 2015 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 "SkLightingShader.h"
#include "SkPoint3.h"
#include "SkShader.h"
static SkBitmap make_checkerboard(int texSize) {
SkBitmap bitmap;
bitmap.allocN32Pixels(texSize, texSize);
SkCanvas canvas(bitmap);
sk_tool_utils::draw_checkerboard(&canvas,
sk_tool_utils::color_to_565(0x0),
sk_tool_utils::color_to_565(0xFF804020),
2);
return bitmap;
}
// Create a hemispherical normal map
static SkBitmap make_hemi_normalmap(int texSize) {
SkBitmap hemi;
hemi.allocN32Pixels(texSize, texSize);
sk_tool_utils::create_hemi_normal_map(&hemi, SkIRect::MakeWH(texSize, texSize));
return hemi;
}
// Create a truncated pyramid normal map
static SkBitmap make_frustum_normalmap(int texSize) {
SkBitmap frustum;
frustum.allocN32Pixels(texSize, texSize);
sk_tool_utils::create_frustum_normal_map(&frustum, SkIRect::MakeWH(texSize, texSize));
return frustum;
}
// Create a tetrahedral normal map
static SkBitmap make_tetra_normalmap(int texSize) {
SkBitmap tetra;
tetra.allocN32Pixels(texSize, texSize);
sk_tool_utils::create_tetra_normal_map(&tetra, SkIRect::MakeWH(texSize, texSize));
return tetra;
}
namespace skiagm {
// This GM exercises lighting shaders.
class LightingShaderGM : public GM {
public:
LightingShaderGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
fLight.fColor = SkColor3f::Make(1.0f, 1.0f, 1.0f);
fLight.fDirection = SkVector3::Make(0.0f, 0.0f, 1.0f);
fAmbient = SkColor3f::Make(0.1f, 0.1f, 0.1f);
}
protected:
enum NormalMap {
kHemi_NormalMap,
kFrustum_NormalMap,
kTetra_NormalMap,
kLast_NormalMap = kTetra_NormalMap
};
static const int kNormalMapCount = kLast_NormalMap+1;
SkString onShortName() override {
return SkString("lightingshader");
}
SkISize onISize() override {
return SkISize::Make(kGMSize, kGMSize);
}
void onOnceBeforeDraw() override {
fDiffuse = make_checkerboard(kTexSize);
fNormalMaps[kHemi_NormalMap] = make_hemi_normalmap(kTexSize);
fNormalMaps[kFrustum_NormalMap] = make_frustum_normalmap(kTexSize);
fNormalMaps[kTetra_NormalMap] = make_tetra_normalmap(kTexSize);
}
void drawRect(SkCanvas* canvas, const SkRect& r, NormalMap mapType) {
SkRect bitmapBounds = SkRect::MakeIWH(fDiffuse.width(), fDiffuse.height());
SkMatrix matrix;
matrix.setRectToRect(bitmapBounds, r, SkMatrix::kFill_ScaleToFit);
SkAutoTUnref<SkShader> fShader(SkLightingShader::Create(
fDiffuse,
fNormalMaps[mapType],
fLight, fAmbient,
&matrix));
SkPaint paint;
paint.setShader(fShader);
canvas->drawRect(r, paint);
}
void onDraw(SkCanvas* canvas) override {
SkRect r = SkRect::MakeWH(SkIntToScalar(kTexSize), SkIntToScalar(kTexSize));
this->drawRect(canvas, r, kHemi_NormalMap);
r.offset(kGMSize - kTexSize, 0);
this->drawRect(canvas, r, kFrustum_NormalMap);
r.offset(0, kGMSize - kTexSize);
this->drawRect(canvas, r, kTetra_NormalMap);
r.offset(kTexSize - kGMSize, 0);
this->drawRect(canvas, r, kHemi_NormalMap);
}
private:
static const int kTexSize = 128;
static const int kGMSize = 512;
SkBitmap fDiffuse;
SkBitmap fNormalMaps[kNormalMapCount];
SkLightingShader::Light fLight;
SkColor3f fAmbient;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return SkNEW(LightingShaderGM); )
}
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