/*
* Copyright 2012 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkLightingImageFilter.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#include "SkOrderedReadBuffer.h"
#include "SkOrderedWriteBuffer.h"
#include "SkTypes.h"
#if SK_SUPPORT_GPU
#include "GrProgramStageFactory.h"
#include "effects/GrSingleTextureEffect.h"
#include "gl/GrGLProgramStage.h"
#include "gl/GrGLTexture.h"
#include "GrCustomStage.h"
class GrGLDiffuseLightingEffect;
class GrGLSpecularLightingEffect;
// For brevity
typedef GrGLUniformManager::UniformHandle UniformHandle;
static const UniformHandle kInvalidUniformHandle = GrGLUniformManager::kInvalidUniformHandle;
#endif
namespace {
const SkScalar gOneThird = SkScalarInvert(SkIntToScalar(3));
const SkScalar gTwoThirds = SkScalarDiv(SkIntToScalar(2), SkIntToScalar(3));
const SkScalar gOneHalf = SkFloatToScalar(0.5f);
const SkScalar gOneQuarter = SkFloatToScalar(0.25f);
#if SK_SUPPORT_GPU
void setUniformPoint3(const GrGLUniformManager& uman, UniformHandle uni, const SkPoint3& point) {
GR_STATIC_ASSERT(sizeof(SkPoint3) == 3 * sizeof(GrGLfloat));
uman.set3fv(uni, 0, 1, &point.fX);
}
void setUniformNormal3(const GrGLUniformManager& uman, UniformHandle uni, const SkPoint3& point) {
setUniformPoint3(uman, uni, SkPoint3(point.fX, -point.fY, point.fZ));
}
void setUniformPoint3FlipY(const GrGLUniformManager& uman,
UniformHandle uni,
const SkPoint3& point,
int height) {
setUniformPoint3(uman, uni, SkPoint3(point.fX, height-point.fY, point.fZ));
}
#endif
// Shift matrix components to the left, as we advance pixels to the right.
inline void shiftMatrixLeft(int m[9]) {
m[0] = m[1];
m[3] = m[4];
m[6] = m[7];
m[1] = m[2];
m[4] = m[5];
m[7] = m[8];
}
class DiffuseLightingType {
public:
DiffuseLightingType(SkScalar kd)
: fKD(kd) {}
SkPMColor light(const SkPoint3& normal, const SkPoint3& surfaceTolight, const SkPoint3& lightColor) const {
SkScalar colorScale = SkScalarMul(fKD, normal.dot(surfaceTolight));
colorScale = SkScalarClampMax(colorScale, SK_Scalar1);
SkPoint3 color(lightColor * colorScale);
return SkPackARGB32(255,
SkScalarFloorToInt(color.fX),
SkScalarFloorToInt(color.fY),
SkScalarFloorToInt(color.fZ));
}
private:
SkScalar fKD;
};
class SpecularLightingType {
public:
SpecularLightingType(SkScalar ks, SkScalar shininess)
: fKS(ks), fShininess(shininess) {}
SkPMColor light(const SkPoint3& normal, const SkPoint3& surfaceTolight, const SkPoint3& lightColor) const {
SkPoint3 halfDir(surfaceTolight);
halfDir.fZ += SK_Scalar1; // eye position is always (0, 0, 1)
halfDir.normalize();
SkScalar colorScale = SkScalarMul(fKS,
SkScalarPow(normal.dot(halfDir), fShininess));
colorScale = SkScalarClampMax(colorScale, SK_Scalar1);
SkPoint3 color(lightColor * colorScale);
return SkPackARGB32(SkScalarFloorToInt(color.maxComponent()),
SkScalarFloorToInt(color.fX),
SkScalarFloorToInt(color.fY),
SkScalarFloorToInt(color.fZ));
}
private:
SkScalar fKS;
SkScalar fShininess;
};
inline SkScalar sobel(int a, int b, int c, int d, int e, int f, SkScalar scale) {
return SkScalarMul(SkIntToScalar(-a + b - 2 * c + 2 * d -e + f), scale);
}
inline SkPoint3 pointToNormal(SkScalar x, SkScalar y, SkScalar surfaceScale) {
SkPoint3 vector(SkScalarMul(-x, surfaceScale),
SkScalarMul(-y, surfaceScale),
SK_Scalar1);
vector.normalize();
return vector;
}
inline SkPoint3 topLeftNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(0, 0, m[4], m[5], m[7], m[8], gTwoThirds),
sobel(0, 0, m[4], m[7], m[5], m[8], gTwoThirds),
surfaceScale);
}
inline SkPoint3 topNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel( 0, 0, m[3], m[5], m[6], m[8], gOneThird),
sobel(m[3], m[6], m[4], m[7], m[5], m[8], gOneHalf),
surfaceScale);
}
inline SkPoint3 topRightNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel( 0, 0, m[3], m[4], m[6], m[7], gTwoThirds),
sobel(m[3], m[6], m[4], m[7], 0, 0, gTwoThirds),
surfaceScale);
}
inline SkPoint3 leftNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[1], m[2], m[4], m[5], m[7], m[8], gOneHalf),
sobel( 0, 0, m[1], m[7], m[2], m[8], gOneThird),
surfaceScale);
}
inline SkPoint3 interiorNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[0], m[2], m[3], m[5], m[6], m[8], gOneQuarter),
sobel(m[0], m[6], m[1], m[7], m[2], m[8], gOneQuarter),
surfaceScale);
}
inline SkPoint3 rightNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[0], m[1], m[3], m[4], m[6], m[7], gOneHalf),
sobel(m[0], m[6], m[1], m[7], 0, 0, gOneThird),
surfaceScale);
}
inline SkPoint3 bottomLeftNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[1], m[2], m[4], m[5], 0, 0, gTwoThirds),
sobel( 0, 0, m[1], m[4], m[2], m[5], gTwoThirds),
surfaceScale);
}
inline SkPoint3 bottomNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[0], m[2], m[3], m[5], 0, 0, gOneThird),
sobel(m[0], m[3], m[1], m[4], m[2], m[5], gOneHalf),
surfaceScale);
}
inline SkPoint3 bottomRightNormal(int m[9], SkScalar surfaceScale) {
return pointToNormal(sobel(m[0], m[1], m[3], m[4], 0, 0, gTwoThirds),
sobel(m[0], m[3], m[1], m[4], 0, 0, gTwoThirds),
surfaceScale);
}
template <class LightingType, class LightType> void lightBitmap(const LightingType& lightingType, const SkLight* light, const SkBitmap& src, SkBitmap* dst, SkScalar surfaceScale) {
const LightType* l = static_cast<const LightType*>(light);
int y = 0;
{
const SkPMColor* row1 = src.getAddr32(0, 0);
const SkPMColor* row2 = src.getAddr32(0, 1);
SkPMColor* dptr = dst->getAddr32(0, 0);
int m[9];
int x = 0;
m[4] = SkGetPackedA32(*row1++);
m[5] = SkGetPackedA32(*row1++);
m[7] = SkGetPackedA32(*row2++);
m[8] = SkGetPackedA32(*row2++);
SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(topLeftNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
for (x = 1; x < src.width() - 1; ++x)
{
shiftMatrixLeft(m);
m[5] = SkGetPackedA32(*row1++);
m[8] = SkGetPackedA32(*row2++);
surfaceToLight = l->surfaceToLight(x, 0, m[4], surfaceScale);
*dptr++ = lightingType.light(topNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
shiftMatrixLeft(m);
surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(topRightNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
for (++y; y < src.height() - 1; ++y) {
const SkPMColor* row0 = src.getAddr32(0, y - 1);
const SkPMColor* row1 = src.getAddr32(0, y);
const SkPMColor* row2 = src.getAddr32(0, y + 1);
SkPMColor* dptr = dst->getAddr32(0, y);
int m[9];
int x = 0;
m[1] = SkGetPackedA32(*row0++);
m[2] = SkGetPackedA32(*row0++);
m[4] = SkGetPackedA32(*row1++);
m[5] = SkGetPackedA32(*row1++);
m[7] = SkGetPackedA32(*row2++);
m[8] = SkGetPackedA32(*row2++);
SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(leftNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
for (x = 1; x < src.width() - 1; ++x) {
shiftMatrixLeft(m);
m[2] = SkGetPackedA32(*row0++);
m[5] = SkGetPackedA32(*row1++);
m[8] = SkGetPackedA32(*row2++);
surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(interiorNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
shiftMatrixLeft(m);
surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(rightNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
{
const SkPMColor* row0 = src.getAddr32(0, src.height() - 2);
const SkPMColor* row1 = src.getAddr32(0, src.height() - 1);
int x = 0;
SkPMColor* dptr = dst->getAddr32(0, src.height() - 1);
int m[9];
m[1] = SkGetPackedA32(*row0++);
m[2] = SkGetPackedA32(*row0++);
m[4] = SkGetPackedA32(*row1++);
m[5] = SkGetPackedA32(*row1++);
SkPoint3 surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(bottomLeftNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
for (x = 1; x < src.width() - 1; ++x)
{
shiftMatrixLeft(m);
m[2] = SkGetPackedA32(*row0++);
m[5] = SkGetPackedA32(*row1++);
surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(bottomNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
shiftMatrixLeft(m);
surfaceToLight = l->surfaceToLight(x, y, m[4], surfaceScale);
*dptr++ = lightingType.light(bottomRightNormal(m, surfaceScale), surfaceToLight, l->lightColor(surfaceToLight));
}
}
SkPoint3 readPoint3(SkFlattenableReadBuffer& buffer) {
SkPoint3 point;
point.fX = buffer.readScalar();
point.fY = buffer.readScalar();
point.fZ = buffer.readScalar();
return point;
};
void writePoint3(const SkPoint3& point, SkFlattenableWriteBuffer& buffer) {
buffer.writeScalar(point.fX);
buffer.writeScalar(point.fY);
buffer.writeScalar(point.fZ);
};
class SkDiffuseLightingImageFilter : public SkLightingImageFilter {
public:
SkDiffuseLightingImageFilter(SkLight* light, SkScalar surfaceScale, SkScalar kd);
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiffuseLightingImageFilter)
virtual bool asNewCustomStage(GrCustomStage** stage, GrTexture*) const SK_OVERRIDE;
SkScalar kd() const { return fKD; }
protected:
explicit SkDiffuseLightingImageFilter(SkFlattenableReadBuffer& buffer);
virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
private:
typedef SkLightingImageFilter INHERITED;
SkScalar fKD;
};
class SkSpecularLightingImageFilter : public SkLightingImageFilter {
public:
SkSpecularLightingImageFilter(SkLight* light, SkScalar surfaceScale, SkScalar ks, SkScalar shininess);
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSpecularLightingImageFilter)
virtual bool asNewCustomStage(GrCustomStage** stage, GrTexture*) const SK_OVERRIDE;
SkScalar ks() const { return fKS; }
SkScalar shininess() const { return fShininess; }
protected:
explicit SkSpecularLightingImageFilter(SkFlattenableReadBuffer& buffer);
virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
private:
typedef SkLightingImageFilter INHERITED;
SkScalar fKS;
SkScalar fShininess;
};
#if SK_SUPPORT_GPU
class GrLightingEffect : public GrSingleTextureEffect {
public:
GrLightingEffect(GrTexture* texture, const SkLight* light, SkScalar surfaceScale);
virtual ~GrLightingEffect();
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
const SkLight* light() const { return fLight; }
SkScalar surfaceScale() const { return fSurfaceScale; }
private:
typedef GrSingleTextureEffect INHERITED;
const SkLight* fLight;
SkScalar fSurfaceScale;
};
class GrDiffuseLightingEffect : public GrLightingEffect {
public:
GrDiffuseLightingEffect(GrTexture* texture,
const SkLight* light,
SkScalar surfaceScale,
SkScalar kd);
static const char* Name() { return "DiffuseLighting"; }
typedef GrGLDiffuseLightingEffect GLProgramStage;
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
SkScalar kd() const { return fKD; }
private:
GR_DECLARE_CUSTOM_STAGE_TEST;
typedef GrLightingEffect INHERITED;
SkScalar fKD;
};
class GrSpecularLightingEffect : public GrLightingEffect {
public:
GrSpecularLightingEffect(GrTexture* texture,
const SkLight* light,
SkScalar surfaceScale,
SkScalar ks,
SkScalar shininess);
static const char* Name() { return "SpecularLighting"; }
typedef GrGLSpecularLightingEffect GLProgramStage;
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
SkScalar ks() const { return fKS; }
SkScalar shininess() const { return fShininess; }
private:
GR_DECLARE_CUSTOM_STAGE_TEST;
typedef GrLightingEffect INHERITED;
SkScalar fKS;
SkScalar fShininess;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLLight {
public:
virtual ~GrGLLight() {}
virtual void setupVariables(GrGLShaderBuilder* builder);
virtual void emitVS(SkString* out) const {}
virtual void emitFuncs(GrGLShaderBuilder* builder) {}
virtual void emitSurfaceToLight(const GrGLShaderBuilder*,
SkString* out,
const char* z) const = 0;
virtual void emitLightColor(GrGLShaderBuilder*,
const char *surfaceToLight) const;
virtual void setData(const GrGLUniformManager&, const GrRenderTarget* rt, const SkLight* light) const;
private:
typedef SkRefCnt INHERITED;
protected:
UniformHandle fColorUni;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLDistantLight : public GrGLLight {
public:
virtual ~GrGLDistantLight() {}
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&, const GrRenderTarget* rt, const SkLight* light) const SK_OVERRIDE;
virtual void emitSurfaceToLight(const GrGLShaderBuilder*,
SkString* out,
const char* z) const SK_OVERRIDE;
private:
typedef GrGLLight INHERITED;
UniformHandle fDirectionUni;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLPointLight : public GrGLLight {
public:
virtual ~GrGLPointLight() {}
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&, const GrRenderTarget* rt, const SkLight* light) const SK_OVERRIDE;
virtual void emitVS(SkString* out) const SK_OVERRIDE;
virtual void emitSurfaceToLight(const GrGLShaderBuilder*,
SkString* out,
const char* z) const SK_OVERRIDE;
private:
typedef GrGLLight INHERITED;
SkPoint3 fLocation;
UniformHandle fLocationUni;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLSpotLight : public GrGLLight {
public:
virtual ~GrGLSpotLight() {}
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&, const GrRenderTarget* rt, const SkLight* light) const SK_OVERRIDE;
virtual void emitVS(SkString* out) const SK_OVERRIDE;
virtual void emitFuncs(GrGLShaderBuilder* builder);
virtual void emitSurfaceToLight(const GrGLShaderBuilder* builder,
SkString* out,
const char* z) const SK_OVERRIDE;
virtual void emitLightColor(GrGLShaderBuilder*,
const char *surfaceToLight) const SK_OVERRIDE;
private:
typedef GrGLLight INHERITED;
SkString fLightColorFunc;
UniformHandle fLocationUni;
UniformHandle fExponentUni;
UniformHandle fCosOuterConeAngleUni;
UniformHandle fCosInnerConeAngleUni;
UniformHandle fConeScaleUni;
UniformHandle fSUni;
};
#else
class GrGLLight;
#endif
};
///////////////////////////////////////////////////////////////////////////////
class SkLight : public SkFlattenable {
public:
SK_DECLARE_INST_COUNT(SkLight)
enum LightType {
kDistant_LightType,
kPoint_LightType,
kSpot_LightType,
};
virtual LightType type() const = 0;
const SkPoint3& color() const { return fColor; }
virtual GrGLLight* createGLLight() const = 0;
virtual bool isEqual(const SkLight& other) const {
return fColor == other.fColor;
}
protected:
SkLight(SkColor color)
: fColor(SkIntToScalar(SkColorGetR(color)),
SkIntToScalar(SkColorGetG(color)),
SkIntToScalar(SkColorGetB(color))) {}
SkLight(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fColor = readPoint3(buffer);
}
virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE {
INHERITED::flatten(buffer);
writePoint3(fColor, buffer);
}
private:
typedef SkFlattenable INHERITED;
SkPoint3 fColor;
};
SK_DEFINE_INST_COUNT(SkLight)
///////////////////////////////////////////////////////////////////////////////
class SkDistantLight : public SkLight {
public:
SkDistantLight(const SkPoint3& direction, SkColor color)
: INHERITED(color), fDirection(direction) {
}
SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const {
return fDirection;
};
SkPoint3 lightColor(const SkPoint3&) const { return color(); }
virtual LightType type() const { return kDistant_LightType; }
const SkPoint3& direction() const { return fDirection; }
virtual GrGLLight* createGLLight() const SK_OVERRIDE {
#if SK_SUPPORT_GPU
return SkNEW(GrGLDistantLight);
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return NULL;
#endif
}
virtual bool isEqual(const SkLight& other) const SK_OVERRIDE {
if (other.type() != kDistant_LightType) {
return false;
}
const SkDistantLight& o = static_cast<const SkDistantLight&>(other);
return INHERITED::isEqual(other) &&
fDirection == o.fDirection;
}
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDistantLight)
protected:
SkDistantLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
fDirection = readPoint3(buffer);
}
virtual void flatten(SkFlattenableWriteBuffer& buffer) const {
INHERITED::flatten(buffer);
writePoint3(fDirection, buffer);
}
private:
typedef SkLight INHERITED;
SkPoint3 fDirection;
};
///////////////////////////////////////////////////////////////////////////////
class SkPointLight : public SkLight {
public:
SkPointLight(const SkPoint3& location, SkColor color)
: INHERITED(color), fLocation(location) {}
SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const {
SkPoint3 direction(fLocation.fX - SkIntToScalar(x),
fLocation.fY - SkIntToScalar(y),
fLocation.fZ - SkScalarMul(SkIntToScalar(z), surfaceScale));
direction.normalize();
return direction;
};
SkPoint3 lightColor(const SkPoint3&) const { return color(); }
virtual LightType type() const { return kPoint_LightType; }
const SkPoint3& location() const { return fLocation; }
virtual GrGLLight* createGLLight() const SK_OVERRIDE {
#if SK_SUPPORT_GPU
return SkNEW(GrGLPointLight);
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return NULL;
#endif
}
virtual bool isEqual(const SkLight& other) const SK_OVERRIDE {
if (other.type() != kPoint_LightType) {
return false;
}
const SkPointLight& o = static_cast<const SkPointLight&>(other);
return INHERITED::isEqual(other) &&
fLocation == o.fLocation;
}
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPointLight)
protected:
SkPointLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
fLocation = readPoint3(buffer);
}
virtual void flatten(SkFlattenableWriteBuffer& buffer) const {
INHERITED::flatten(buffer);
writePoint3(fLocation, buffer);
}
private:
typedef SkLight INHERITED;
SkPoint3 fLocation;
};
///////////////////////////////////////////////////////////////////////////////
class SkSpotLight : public SkLight {
public:
SkSpotLight(const SkPoint3& location, const SkPoint3& target, SkScalar specularExponent, SkScalar cutoffAngle, SkColor color)
: INHERITED(color),
fLocation(location),
fTarget(target),
fSpecularExponent(specularExponent)
{
fS = target - location;
fS.normalize();
fCosOuterConeAngle = SkScalarCos(SkDegreesToRadians(cutoffAngle));
const SkScalar antiAliasThreshold = SkFloatToScalar(0.016f);
fCosInnerConeAngle = fCosOuterConeAngle + antiAliasThreshold;
fConeScale = SkScalarInvert(antiAliasThreshold);
}
SkPoint3 surfaceToLight(int x, int y, int z, SkScalar surfaceScale) const {
SkPoint3 direction(fLocation.fX - SkIntToScalar(x),
fLocation.fY - SkIntToScalar(y),
fLocation.fZ - SkScalarMul(SkIntToScalar(z), surfaceScale));
direction.normalize();
return direction;
};
SkPoint3 lightColor(const SkPoint3& surfaceToLight) const {
SkScalar cosAngle = -surfaceToLight.dot(fS);
if (cosAngle < fCosOuterConeAngle) {
return SkPoint3(0, 0, 0);
}
SkScalar scale = SkScalarPow(cosAngle, fSpecularExponent);
if (cosAngle < fCosInnerConeAngle) {
scale = SkScalarMul(scale, cosAngle - fCosOuterConeAngle);
return color() * SkScalarMul(scale, fConeScale);
}
return color() * scale;
}
virtual GrGLLight* createGLLight() const SK_OVERRIDE {
#if SK_SUPPORT_GPU
return SkNEW(GrGLSpotLight);
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return NULL;
#endif
}
virtual LightType type() const { return kSpot_LightType; }
const SkPoint3& location() const { return fLocation; }
const SkPoint3& target() const { return fTarget; }
SkScalar specularExponent() const { return fSpecularExponent; }
SkScalar cosInnerConeAngle() const { return fCosInnerConeAngle; }
SkScalar cosOuterConeAngle() const { return fCosOuterConeAngle; }
SkScalar coneScale() const { return fConeScale; }
const SkPoint3& s() const { return fS; }
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSpotLight)
protected:
SkSpotLight(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
fLocation = readPoint3(buffer);
fTarget = readPoint3(buffer);
fSpecularExponent = buffer.readScalar();
fCosOuterConeAngle = buffer.readScalar();
fCosInnerConeAngle = buffer.readScalar();
fConeScale = buffer.readScalar();
fS = readPoint3(buffer);
}
virtual void flatten(SkFlattenableWriteBuffer& buffer) const {
INHERITED::flatten(buffer);
writePoint3(fLocation, buffer);
writePoint3(fTarget, buffer);
buffer.writeScalar(fSpecularExponent);
buffer.writeScalar(fCosOuterConeAngle);
buffer.writeScalar(fCosInnerConeAngle);
buffer.writeScalar(fConeScale);
writePoint3(fS, buffer);
}
virtual bool isEqual(const SkLight& other) const SK_OVERRIDE {
if (other.type() != kSpot_LightType) {
return false;
}
const SkSpotLight& o = static_cast<const SkSpotLight&>(other);
return INHERITED::isEqual(other) &&
fLocation == o.fLocation &&
fTarget == o.fTarget &&
fSpecularExponent == o.fSpecularExponent &&
fCosOuterConeAngle == o.fCosOuterConeAngle;
}
private:
typedef SkLight INHERITED;
SkPoint3 fLocation;
SkPoint3 fTarget;
SkScalar fSpecularExponent;
SkScalar fCosOuterConeAngle;
SkScalar fCosInnerConeAngle;
SkScalar fConeScale;
SkPoint3 fS;
};
///////////////////////////////////////////////////////////////////////////////
SkLightingImageFilter::SkLightingImageFilter(SkLight* light, SkScalar surfaceScale)
: fLight(light),
fSurfaceScale(SkScalarDiv(surfaceScale, SkIntToScalar(255)))
{
SkASSERT(fLight);
// our caller knows that we take ownership of the light, so we don't
// need to call ref() here.
}
SkImageFilter* SkLightingImageFilter::CreateDistantLitDiffuse(
const SkPoint3& direction, SkColor lightColor, SkScalar surfaceScale,
SkScalar kd) {
return SkNEW_ARGS(SkDiffuseLightingImageFilter,
(SkNEW_ARGS(SkDistantLight, (direction, lightColor)), surfaceScale, kd));
}
SkImageFilter* SkLightingImageFilter::CreatePointLitDiffuse(
const SkPoint3& location, SkColor lightColor, SkScalar surfaceScale,
SkScalar kd) {
return SkNEW_ARGS(SkDiffuseLightingImageFilter,
(SkNEW_ARGS(SkPointLight, (location, lightColor)), surfaceScale, kd));
}
SkImageFilter* SkLightingImageFilter::CreateSpotLitDiffuse(
const SkPoint3& location, const SkPoint3& target,
SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale, SkScalar kd) {
return SkNEW_ARGS(SkDiffuseLightingImageFilter,
(SkNEW_ARGS(SkSpotLight, (location, target, specularExponent, cutoffAngle, lightColor)),
surfaceScale, kd));
}
SkImageFilter* SkLightingImageFilter::CreateDistantLitSpecular(
const SkPoint3& direction, SkColor lightColor, SkScalar surfaceScale,
SkScalar ks, SkScalar shininess) {
return SkNEW_ARGS(SkSpecularLightingImageFilter,
(SkNEW_ARGS(SkDistantLight, (direction, lightColor)), surfaceScale, ks, shininess));
}
SkImageFilter* SkLightingImageFilter::CreatePointLitSpecular(
const SkPoint3& location, SkColor lightColor, SkScalar surfaceScale,
SkScalar ks, SkScalar shininess) {
return SkNEW_ARGS(SkSpecularLightingImageFilter,
(SkNEW_ARGS(SkPointLight, (location, lightColor)), surfaceScale, ks, shininess));
}
SkImageFilter* SkLightingImageFilter::CreateSpotLitSpecular(
const SkPoint3& location, const SkPoint3& target,
SkScalar specularExponent, SkScalar cutoffAngle,
SkColor lightColor, SkScalar surfaceScale,
SkScalar ks, SkScalar shininess) {
return SkNEW_ARGS(SkSpecularLightingImageFilter,
(SkNEW_ARGS(SkSpotLight, (location, target, specularExponent, cutoffAngle, lightColor)),
surfaceScale, ks, shininess));
}
SkLightingImageFilter::~SkLightingImageFilter() {
fLight->unref();
}
SkLightingImageFilter::SkLightingImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer)
{
fLight = buffer.readFlattenableT<SkLight>();
fSurfaceScale = buffer.readScalar();
}
void SkLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fLight);
buffer.writeScalar(fSurfaceScale);
}
///////////////////////////////////////////////////////////////////////////////
SkDiffuseLightingImageFilter::SkDiffuseLightingImageFilter(SkLight* light, SkScalar surfaceScale, SkScalar kd)
: SkLightingImageFilter(light, surfaceScale),
fKD(kd)
{
}
SkDiffuseLightingImageFilter::SkDiffuseLightingImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer)
{
fKD = buffer.readScalar();
}
void SkDiffuseLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fKD);
}
bool SkDiffuseLightingImageFilter::onFilterImage(Proxy*,
const SkBitmap& src,
const SkMatrix&,
SkBitmap* dst,
SkIPoint*) {
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
if (src.width() < 2 || src.height() < 2) {
return false;
}
dst->setConfig(src.config(), src.width(), src.height());
dst->allocPixels();
DiffuseLightingType lightingType(fKD);
switch (light()->type()) {
case SkLight::kDistant_LightType:
lightBitmap<DiffuseLightingType, SkDistantLight>(lightingType, light(), src, dst, surfaceScale());
break;
case SkLight::kPoint_LightType:
lightBitmap<DiffuseLightingType, SkPointLight>(lightingType, light(), src, dst, surfaceScale());
break;
case SkLight::kSpot_LightType:
lightBitmap<DiffuseLightingType, SkSpotLight>(lightingType, light(), src, dst, surfaceScale());
break;
}
return true;
}
bool SkDiffuseLightingImageFilter::asNewCustomStage(GrCustomStage** stage,
GrTexture* texture) const {
#if SK_SUPPORT_GPU
if (stage) {
SkScalar scale = SkScalarMul(surfaceScale(), SkIntToScalar(255));
*stage = SkNEW_ARGS(GrDiffuseLightingEffect, (texture, light(), scale, kd()));
}
return true;
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return false;
#endif
}
///////////////////////////////////////////////////////////////////////////////
SkSpecularLightingImageFilter::SkSpecularLightingImageFilter(SkLight* light, SkScalar surfaceScale, SkScalar ks, SkScalar shininess)
: SkLightingImageFilter(light, surfaceScale),
fKS(ks),
fShininess(shininess)
{
}
SkSpecularLightingImageFilter::SkSpecularLightingImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer)
{
fKS = buffer.readScalar();
fShininess = buffer.readScalar();
}
void SkSpecularLightingImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fKS);
buffer.writeScalar(fShininess);
}
bool SkSpecularLightingImageFilter::onFilterImage(Proxy*,
const SkBitmap& src,
const SkMatrix&,
SkBitmap* dst,
SkIPoint*) {
if (src.config() != SkBitmap::kARGB_8888_Config) {
return false;
}
SkAutoLockPixels alp(src);
if (!src.getPixels()) {
return false;
}
if (src.width() < 2 || src.height() < 2) {
return false;
}
dst->setConfig(src.config(), src.width(), src.height());
dst->allocPixels();
SpecularLightingType lightingType(fKS, fShininess);
switch (light()->type()) {
case SkLight::kDistant_LightType:
lightBitmap<SpecularLightingType, SkDistantLight>(lightingType, light(), src, dst, surfaceScale());
break;
case SkLight::kPoint_LightType:
lightBitmap<SpecularLightingType, SkPointLight>(lightingType, light(), src, dst, surfaceScale());
break;
case SkLight::kSpot_LightType:
lightBitmap<SpecularLightingType, SkSpotLight>(lightingType, light(), src, dst, surfaceScale());
break;
}
return true;
}
bool SkSpecularLightingImageFilter::asNewCustomStage(GrCustomStage** stage,
GrTexture* texture) const {
#if SK_SUPPORT_GPU
if (stage) {
SkScalar scale = SkScalarMul(surfaceScale(), SkIntToScalar(255));
*stage = SkNEW_ARGS(GrSpecularLightingEffect, (texture, light(), scale, ks(), shininess()));
}
return true;
#else
SkDEBUGFAIL("Should not call in GPU-less build");
return false;
#endif
}
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
namespace {
SkPoint3 random_point3(SkRandom* random) {
return SkPoint3(SkScalarToFloat(random->nextSScalar1()),
SkScalarToFloat(random->nextSScalar1()),
SkScalarToFloat(random->nextSScalar1()));
}
SkLight* create_random_light(SkRandom* random) {
int type = random->nextULessThan(3);
switch (type) {
case 0: {
return SkNEW_ARGS(SkDistantLight, (random_point3(random), random->nextU()));
}
case 1: {
return SkNEW_ARGS(SkPointLight, (random_point3(random), random->nextU()));
}
case 2: {
return SkNEW_ARGS(SkSpotLight, (random_point3(random),
random_point3(random),
random->nextUScalar1(),
random->nextUScalar1(),
random->nextU()));
}
default:
GrCrash();
return NULL;
}
}
}
class GrGLLightingEffect : public GrGLProgramStage {
public:
GrGLLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual ~GrGLLightingEffect();
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void emitVS(GrGLShaderBuilder* builder,
const char* vertexCoords) SK_OVERRIDE;
virtual void emitFS(GrGLShaderBuilder* builder,
const char* outputColor,
const char* inputColor,
const char* samplerName) SK_OVERRIDE;
virtual void emitLightFunc(GrGLShaderBuilder*, SkString* funcName) = 0;
static inline StageKey GenKey(const GrCustomStage& s, const GrGLCaps& caps);
virtual void setData(const GrGLUniformManager&,
const GrCustomStage&,
const GrRenderTarget*,
int stageNum) SK_OVERRIDE;
private:
typedef GrGLProgramStage INHERITED;
UniformHandle fImageIncrementUni;
UniformHandle fSurfaceScaleUni;
GrGLLight* fLight;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLDiffuseLightingEffect : public GrGLLightingEffect {
public:
GrGLDiffuseLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void emitLightFunc(GrGLShaderBuilder*, SkString* funcName) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&,
const GrCustomStage&,
const GrRenderTarget*,
int stageNum) SK_OVERRIDE;
private:
typedef GrGLLightingEffect INHERITED;
UniformHandle fKDUni;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLSpecularLightingEffect : public GrGLLightingEffect {
public:
GrGLSpecularLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual void setupVariables(GrGLShaderBuilder* builder) SK_OVERRIDE;
virtual void emitLightFunc(GrGLShaderBuilder*, SkString* funcName) SK_OVERRIDE;
virtual void setData(const GrGLUniformManager&,
const GrCustomStage&,
const GrRenderTarget*,
int stageNum) SK_OVERRIDE;
private:
typedef GrGLLightingEffect INHERITED;
UniformHandle fKSUni;
UniformHandle fShininessUni;
};
///////////////////////////////////////////////////////////////////////////////
GrLightingEffect::GrLightingEffect(GrTexture* texture, const SkLight* light, SkScalar surfaceScale)
: GrSingleTextureEffect(texture)
, fLight(light)
, fSurfaceScale(surfaceScale) {
fLight->ref();
}
GrLightingEffect::~GrLightingEffect() {
fLight->unref();
}
bool GrLightingEffect::isEqual(const GrCustomStage& sBase) const {
const GrLightingEffect& s =
static_cast<const GrLightingEffect&>(sBase);
return INHERITED::isEqual(sBase) &&
fLight->isEqual(*s.fLight) &&
fSurfaceScale == s.fSurfaceScale;
}
///////////////////////////////////////////////////////////////////////////////
GrDiffuseLightingEffect::GrDiffuseLightingEffect(GrTexture* texture, const SkLight* light, SkScalar surfaceScale, SkScalar kd)
: INHERITED(texture, light, surfaceScale), fKD(kd) {
}
const GrProgramStageFactory& GrDiffuseLightingEffect::getFactory() const {
return GrTProgramStageFactory<GrDiffuseLightingEffect>::getInstance();
}
bool GrDiffuseLightingEffect::isEqual(const GrCustomStage& sBase) const {
const GrDiffuseLightingEffect& s =
static_cast<const GrDiffuseLightingEffect&>(sBase);
return INHERITED::isEqual(sBase) &&
this->kd() == s.kd();
}
GR_DEFINE_CUSTOM_STAGE_TEST(GrDiffuseLightingEffect);
GrCustomStage* GrDiffuseLightingEffect::TestCreate(SkRandom* random,
GrContext* context,
GrTexture* textures[]) {
SkScalar surfaceScale = random->nextSScalar1();
SkScalar kd = random->nextUScalar1();
SkAutoTUnref<SkLight> light(create_random_light(random));
return SkNEW_ARGS(GrDiffuseLightingEffect, (textures[GrCustomStageUnitTest::kAlphaTextureIdx],
light, surfaceScale, kd));
}
///////////////////////////////////////////////////////////////////////////////
GrGLLightingEffect::GrGLLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage)
: GrGLProgramStage(factory)
, fImageIncrementUni(kInvalidUniformHandle)
, fSurfaceScaleUni(kInvalidUniformHandle) {
const GrLightingEffect& m = static_cast<const GrLightingEffect&>(stage);
fLight = m.light()->createGLLight();
}
GrGLLightingEffect::~GrGLLightingEffect() {
delete fLight;
}
void GrGLLightingEffect::setupVariables(GrGLShaderBuilder* builder) {
fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kVec2f_GrSLType,
"ImageIncrement");
fSurfaceScaleUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType,
"SurfaceScale");
fLight->setupVariables(builder);
}
void GrGLLightingEffect::emitVS(GrGLShaderBuilder* builder,
const char* vertexCoords) {
fLight->emitVS(&builder->fVSCode);
}
void GrGLLightingEffect::emitFS(GrGLShaderBuilder* builder,
const char* outputColor,
const char* inputColor,
const char* samplerName) {
SkString* code = &builder->fFSCode;
fLight->emitFuncs(builder);
SkString lightFunc;
this->emitLightFunc(builder, &lightFunc);
static const GrGLShaderVar gSobelArgs[] = {
GrGLShaderVar("a", kFloat_GrSLType),
GrGLShaderVar("b", kFloat_GrSLType),
GrGLShaderVar("c", kFloat_GrSLType),
GrGLShaderVar("d", kFloat_GrSLType),
GrGLShaderVar("e", kFloat_GrSLType),
GrGLShaderVar("f", kFloat_GrSLType),
GrGLShaderVar("scale", kFloat_GrSLType),
};
SkString sobelFuncName;
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType,
"sobel",
SK_ARRAY_COUNT(gSobelArgs),
gSobelArgs,
"\treturn (-a + b - 2.0 * c + 2.0 * d -e + f) * scale;\n",
&sobelFuncName);
static const GrGLShaderVar gPointToNormalArgs[] = {
GrGLShaderVar("x", kFloat_GrSLType),
GrGLShaderVar("y", kFloat_GrSLType),
GrGLShaderVar("scale", kFloat_GrSLType),
};
SkString pointToNormalName;
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType,
"pointToNormal",
SK_ARRAY_COUNT(gPointToNormalArgs),
gPointToNormalArgs,
"\treturn normalize(vec3(-x * scale, -y * scale, 1));\n",
&pointToNormalName);
static const GrGLShaderVar gInteriorNormalArgs[] = {
GrGLShaderVar("m", kFloat_GrSLType, 9),
GrGLShaderVar("surfaceScale", kFloat_GrSLType),
};
SkString interiorNormalBody;
interiorNormalBody.appendf("\treturn %s(%s(m[0], m[2], m[3], m[5], m[6], m[8], 0.25),\n"
"\t %s(m[0], m[6], m[1], m[7], m[2], m[8], 0.25),\n"
"\t surfaceScale);\n",
pointToNormalName.c_str(),
sobelFuncName.c_str(),
sobelFuncName.c_str());
SkString interiorNormalName;
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType,
"interiorNormal",
SK_ARRAY_COUNT(gInteriorNormalArgs),
gInteriorNormalArgs,
interiorNormalBody.c_str(),
&interiorNormalName);
code->appendf("\t\tvec2 coord = %s;\n", builder->fSampleCoords.c_str());
code->appendf("\t\tfloat m[9];\n");
const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
const char* surfScale = builder->getUniformCStr(fSurfaceScaleUni);
int index = 0;
for (int dy = -1; dy <= 1; dy++) {
for (int dx = -1; dx <= 1; dx++) {
SkString texCoords;
texCoords.appendf("coord + vec2(%d, %d) * %s", dx, dy, imgInc);
code->appendf("\t\tm[%d] = ", index++);
builder->emitTextureLookup(samplerName, texCoords.c_str());
code->appendf(".a;\n");
}
}
code->appendf("\t\tvec3 surfaceToLight = ");
SkString arg;
arg.appendf("%s * m[4]", surfScale);
fLight->emitSurfaceToLight(builder, code, arg.c_str());
code->appendf(";\n");
code->appendf("\t\t%s = %s(%s(m, %s), surfaceToLight, ",
outputColor, lightFunc.c_str(), interiorNormalName.c_str(), surfScale);
fLight->emitLightColor(builder, "surfaceToLight");
code->appendf(")%s;\n", builder->fModulate.c_str());
}
GrGLProgramStage::StageKey GrGLLightingEffect::GenKey(const GrCustomStage& s,
const GrGLCaps& caps) {
return static_cast<const GrLightingEffect&>(s).light()->type();
}
void GrGLLightingEffect::setData(const GrGLUniformManager& uman,
const GrCustomStage& data,
const GrRenderTarget* rt,
int stageNum) {
const GrLightingEffect& effect =
static_cast<const GrLightingEffect&>(data);
GrGLTexture* texture = static_cast<GrGLTexture*>(data.texture(0));
float ySign = texture->orientation() == GrGLTexture::kTopDown_Orientation ? -1.0f : 1.0f;
uman.set2f(fImageIncrementUni, 1.0f / texture->width(), ySign / texture->height());
uman.set1f(fSurfaceScaleUni, effect.surfaceScale());
fLight->setData(uman, rt, effect.light());
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
GrGLDiffuseLightingEffect::GrGLDiffuseLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage)
: INHERITED(factory, stage)
, fKDUni(kInvalidUniformHandle) {
}
void GrGLDiffuseLightingEffect::setupVariables(GrGLShaderBuilder* builder) {
INHERITED::setupVariables(builder);
fKDUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, kFloat_GrSLType, "KD");
}
void GrGLDiffuseLightingEffect::emitLightFunc(GrGLShaderBuilder* builder, SkString* funcName) {
const char* kd = builder->getUniformCStr(fKDUni);
static const GrGLShaderVar gLightArgs[] = {
GrGLShaderVar("normal", kVec3f_GrSLType),
GrGLShaderVar("surfaceToLight", kVec3f_GrSLType),
GrGLShaderVar("lightColor", kVec3f_GrSLType)
};
SkString lightBody;
lightBody.appendf("\tfloat colorScale = %s * dot(normal, surfaceToLight);\n", kd);
lightBody.appendf("\treturn vec4(lightColor * clamp(colorScale, 0.0, 1.0), 1.0);\n");
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kVec4f_GrSLType,
"light",
SK_ARRAY_COUNT(gLightArgs),
gLightArgs,
lightBody.c_str(),
funcName);
}
void GrGLDiffuseLightingEffect::setData(const GrGLUniformManager& uman,
const GrCustomStage& data,
const GrRenderTarget* rt,
int stageNum) {
INHERITED::setData(uman, data, rt, stageNum);
const GrDiffuseLightingEffect& effect =
static_cast<const GrDiffuseLightingEffect&>(data);
uman.set1f(fKDUni, effect.kd());
}
///////////////////////////////////////////////////////////////////////////////
GrSpecularLightingEffect::GrSpecularLightingEffect(GrTexture* texture, const SkLight* light, SkScalar surfaceScale, SkScalar ks, SkScalar shininess)
: INHERITED(texture, light, surfaceScale),
fKS(ks),
fShininess(shininess) {
}
const GrProgramStageFactory& GrSpecularLightingEffect::getFactory() const {
return GrTProgramStageFactory<GrSpecularLightingEffect>::getInstance();
}
bool GrSpecularLightingEffect::isEqual(const GrCustomStage& sBase) const {
const GrSpecularLightingEffect& s =
static_cast<const GrSpecularLightingEffect&>(sBase);
return INHERITED::isEqual(sBase) &&
this->ks() == s.ks() &&
this->shininess() == s.shininess();
}
GR_DEFINE_CUSTOM_STAGE_TEST(GrSpecularLightingEffect);
GrCustomStage* GrSpecularLightingEffect::TestCreate(SkRandom* random,
GrContext* context,
GrTexture* textures[]) {
SkScalar surfaceScale = random->nextSScalar1();
SkScalar ks = random->nextUScalar1();
SkScalar shininess = random->nextUScalar1();
SkAutoTUnref<SkLight> light(create_random_light(random));
return SkNEW_ARGS(GrSpecularLightingEffect, (textures[GrCustomStageUnitTest::kAlphaTextureIdx],
light, surfaceScale, ks, shininess));
}
///////////////////////////////////////////////////////////////////////////////
GrGLSpecularLightingEffect::GrGLSpecularLightingEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage)
: GrGLLightingEffect(factory, stage)
, fKSUni(kInvalidUniformHandle)
, fShininessUni(kInvalidUniformHandle) {
}
void GrGLSpecularLightingEffect::setupVariables(GrGLShaderBuilder* builder) {
INHERITED::setupVariables(builder);
fKSUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "KS");
fShininessUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "Shininess");
}
void GrGLSpecularLightingEffect::emitLightFunc(GrGLShaderBuilder* builder, SkString* funcName) {
const char* ks = builder->getUniformCStr(fKSUni);
const char* shininess = builder->getUniformCStr(fShininessUni);
static const GrGLShaderVar gLightArgs[] = {
GrGLShaderVar("normal", kVec3f_GrSLType),
GrGLShaderVar("surfaceToLight", kVec3f_GrSLType),
GrGLShaderVar("lightColor", kVec3f_GrSLType)
};
SkString lightBody;
lightBody.appendf("\tvec3 halfDir = vec3(normalize(surfaceToLight + vec3(0, 0, 1)));\n");
lightBody.appendf("\tfloat colorScale = %s * pow(dot(normal, halfDir), %s);\n", ks, shininess);
lightBody.appendf("\treturn vec4(lightColor * clamp(colorScale, 0.0, 1.0), 1.0);\n");
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kVec4f_GrSLType,
"light",
SK_ARRAY_COUNT(gLightArgs),
gLightArgs,
lightBody.c_str(),
funcName);
}
void GrGLSpecularLightingEffect::setData(const GrGLUniformManager& uman,
const GrCustomStage& data,
const GrRenderTarget* rt,
int stageNum) {
INHERITED::setData(uman, data, rt, stageNum);
const GrSpecularLightingEffect& effect = static_cast<const GrSpecularLightingEffect&>(data);
uman.set1f(fKSUni, effect.ks());
uman.set1f(fShininessUni, effect.shininess());
}
///////////////////////////////////////////////////////////////////////////////
void GrGLLight::emitLightColor(GrGLShaderBuilder* builder,
const char *surfaceToLight) const {
const char* color = builder->getUniformCStr(fColorUni);
builder->fFSCode.append(color);
}
void GrGLLight::setupVariables(GrGLShaderBuilder* builder) {
fColorUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType, "LightColor");
}
void GrGLLight::setData(const GrGLUniformManager& uman,
const GrRenderTarget* rt,
const SkLight* light) const {
setUniformPoint3(uman, fColorUni, light->color() * SkScalarInvert(SkIntToScalar(255)));
}
///////////////////////////////////////////////////////////////////////////////
void GrGLDistantLight::setupVariables(GrGLShaderBuilder* builder) {
INHERITED::setupVariables(builder);
fDirectionUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, kVec3f_GrSLType,
"LightDirection");
}
void GrGLDistantLight::setData(const GrGLUniformManager& uman,
const GrRenderTarget* rt,
const SkLight* light) const {
INHERITED::setData(uman, rt, light);
SkASSERT(light->type() == SkLight::kDistant_LightType);
const SkDistantLight* distantLight = static_cast<const SkDistantLight*>(light);
setUniformNormal3(uman, fDirectionUni, distantLight->direction());
}
void GrGLDistantLight::emitSurfaceToLight(const GrGLShaderBuilder* builder,
SkString* out,
const char* z) const {
const char* dir = builder->getUniformCStr(fDirectionUni);
out->append(dir);
}
///////////////////////////////////////////////////////////////////////////////
void GrGLPointLight::setupVariables(GrGLShaderBuilder* builder) {
INHERITED::setupVariables(builder);
fLocationUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType, kVec3f_GrSLType,
"LightLocation");
}
void GrGLPointLight::setData(const GrGLUniformManager& uman,
const GrRenderTarget* rt,
const SkLight* light) const {
INHERITED::setData(uman, rt, light);
SkASSERT(light->type() == SkLight::kPoint_LightType);
const SkPointLight* pointLight = static_cast<const SkPointLight*>(light);
setUniformPoint3FlipY(uman, fLocationUni, pointLight->location(), rt->height());
}
void GrGLPointLight::emitVS(SkString* out) const {
}
void GrGLPointLight::emitSurfaceToLight(const GrGLShaderBuilder* builder,
SkString* out,
const char* z) const {
const char* loc = builder->getUniformCStr(fLocationUni);
out->appendf("normalize(%s - vec3(gl_FragCoord.xy, %s))", loc, z);
}
///////////////////////////////////////////////////////////////////////////////
void GrGLSpotLight::setupVariables(GrGLShaderBuilder* builder) {
INHERITED::setupVariables(builder);
fLocationUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType, "LightLocation");
fExponentUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "Exponent");
fCosInnerConeAngleUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "CosInnerConeAngle");
fCosOuterConeAngleUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "CosOuterConeAngle");
fConeScaleUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kFloat_GrSLType, "ConeScale");
fSUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType, "S");
}
void GrGLSpotLight::setData(const GrGLUniformManager& uman,
const GrRenderTarget* rt,
const SkLight* light) const {
INHERITED::setData(uman, rt, light);
SkASSERT(light->type() == SkLight::kSpot_LightType);
const SkSpotLight* spotLight = static_cast<const SkSpotLight *>(light);
setUniformPoint3FlipY(uman, fLocationUni, spotLight->location(), rt->height());
uman.set1f(fExponentUni, spotLight->specularExponent());
uman.set1f(fCosInnerConeAngleUni, spotLight->cosInnerConeAngle());
uman.set1f(fCosOuterConeAngleUni, spotLight->cosOuterConeAngle());
uman.set1f(fConeScaleUni, spotLight->coneScale());
setUniformNormal3(uman, fSUni, spotLight->s());
}
void GrGLSpotLight::emitVS(SkString* out) const {
}
void GrGLSpotLight::emitFuncs(GrGLShaderBuilder* builder) {
const char* exponent = builder->getUniformCStr(fExponentUni);
const char* cosInner = builder->getUniformCStr(fCosInnerConeAngleUni);
const char* cosOuter = builder->getUniformCStr(fCosOuterConeAngleUni);
const char* coneScale = builder->getUniformCStr(fConeScaleUni);
const char* s = builder->getUniformCStr(fSUni);
const char* color = builder->getUniformCStr(fColorUni);
static const GrGLShaderVar gLightColorArgs[] = {
GrGLShaderVar("surfaceToLight", kVec3f_GrSLType)
};
SkString lightColorBody;
lightColorBody.appendf("\tfloat cosAngle = -dot(surfaceToLight, %s);\n", s);
lightColorBody.appendf("\tif (cosAngle < %s) {\n", cosOuter);
lightColorBody.appendf("\t\treturn vec3(0);\n");
lightColorBody.appendf("\t}\n");
lightColorBody.appendf("\tfloat scale = pow(cosAngle, %s);\n", exponent);
lightColorBody.appendf("\tif (cosAngle < %s) {\n", cosInner);
lightColorBody.appendf("\t\treturn %s * scale * (cosAngle - %s) * %s;\n",
color, cosOuter, coneScale);
lightColorBody.appendf("\t}\n");
lightColorBody.appendf("\treturn %s;\n", color);
builder->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
kVec3f_GrSLType,
"lightColor",
SK_ARRAY_COUNT(gLightColorArgs),
gLightColorArgs,
lightColorBody.c_str(),
&fLightColorFunc);
}
void GrGLSpotLight::emitSurfaceToLight(const GrGLShaderBuilder* builder,
SkString* out,
const char* z) const {
const char* location= builder->getUniformCStr(fLocationUni);
out->appendf("normalize(%s - vec3(gl_FragCoord.xy, %s))", location, z);
}
void GrGLSpotLight::emitLightColor(GrGLShaderBuilder* builder,
const char *surfaceToLight) const {
builder->fFSCode.appendf("%s(%s)", fLightColorFunc.c_str(), surfaceToLight);
}
#endif
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingImageFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDiffuseLightingImageFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpecularLightingImageFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDistantLight)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkPointLight)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpotLight)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END