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-rw-r--r--gm/lightingshader.cpp17
-rwxr-xr-xsamplecode/SampleLighting.cpp11
-rw-r--r--samplecode/SampleLitAtlas.cpp16
-rw-r--r--src/core/SkLightingShader.cpp88
-rw-r--r--src/core/SkLightingShader.h28
-rw-r--r--src/core/SkNormalSource.cpp117
-rw-r--r--src/core/SkNormalSource.h12
-rw-r--r--tests/SerializationTest.cpp13
8 files changed, 139 insertions, 163 deletions
diff --git a/gm/lightingshader.cpp b/gm/lightingshader.cpp
index ae6a24f9f0..3b1c224f2b 100644
--- a/gm/lightingshader.cpp
+++ b/gm/lightingshader.cpp
@@ -7,7 +7,9 @@
#include "gm.h"
+#include "SkBitmapProcShader.h"
#include "SkLightingShader.h"
+#include "SkNormalSource.h"
#include "SkPoint3.h"
#include "SkShader.h"
@@ -49,7 +51,9 @@ public:
SkLights::Builder builder;
builder.add(SkLights::Light(SkColor3f::Make(1.0f, 1.0f, 1.0f),
- SkVector3::Make(1.0f, 0.0f, 0.0f)));
+ SkVector3::Make(SK_ScalarRoot2Over2,
+ 0.0f,
+ SK_ScalarRoot2Over2)));
builder.add(SkLights::Light(SkColor3f::Make(0.2f, 0.2f, 0.2f)));
fLights = builder.finish();
@@ -95,12 +99,13 @@ protected:
const SkMatrix& ctm = canvas->getTotalMatrix();
- // TODO: correctly pull out the pure rotation
- SkVector invNormRotation = { ctm[SkMatrix::kMScaleX], ctm[SkMatrix::kMSkewY] };
-
SkPaint paint;
- paint.setShader(SkLightingShader::Make(fDiffuse, fNormalMaps[mapType], fLights,
- invNormRotation, &matrix, &matrix));
+ sk_sp<SkShader> normalMap = SkMakeBitmapShader(fNormalMaps[mapType],
+ SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, &matrix, nullptr);
+ sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(std::move(normalMap),
+ ctm);
+ paint.setShader(SkLightingShader::Make(fDiffuse, fLights, &matrix,
+ std::move(normalSource)));
canvas->drawRect(r, paint);
}
diff --git a/samplecode/SampleLighting.cpp b/samplecode/SampleLighting.cpp
index a27aa9de41..5949f4961b 100755
--- a/samplecode/SampleLighting.cpp
+++ b/samplecode/SampleLighting.cpp
@@ -8,8 +8,10 @@
#include "SampleCode.h"
#include "Resources.h"
+#include "SkBitmapProcShader.h"
#include "SkCanvas.h"
#include "SkLightingShader.h"
+#include "SkNormalSource.h"
#include "SkPoint3.h"
static sk_sp<SkLights> create_lights(SkScalar angle, SkScalar blue) {
@@ -64,9 +66,12 @@ protected:
sk_sp<SkLights> lights(create_lights(fLightAngle, fColorFactor));
SkPaint paint;
- paint.setShader(SkLightingShader::Make(fDiffuseBitmap, fNormalBitmap,
- std::move(lights), SkVector::Make(1.0f, 0.0f),
- nullptr, nullptr));
+ sk_sp<SkShader> normalMap = SkMakeBitmapShader(fNormalBitmap,
+ SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, nullptr, nullptr);
+ sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(
+ std::move(normalMap), SkMatrix::I());
+ paint.setShader(SkLightingShader::Make(fDiffuseBitmap, std::move(lights), nullptr,
+ std::move(normalSource)));
paint.setColor(SK_ColorBLACK);
SkRect r = SkRect::MakeWH((SkScalar)fDiffuseBitmap.width(),
diff --git a/samplecode/SampleLitAtlas.cpp b/samplecode/SampleLitAtlas.cpp
index f1d67e5c79..ba42ed8761 100644
--- a/samplecode/SampleLitAtlas.cpp
+++ b/samplecode/SampleLitAtlas.cpp
@@ -7,13 +7,15 @@
#include "SampleCode.h"
#include "SkAnimTimer.h"
-#include "SkView.h"
+#include "SkBitmapProcShader.h"
#include "SkCanvas.h"
#include "SkDrawable.h"
#include "SkLightingShader.h"
#include "SkLights.h"
+#include "SkNormalSource.h"
#include "SkRandom.h"
#include "SkRSXform.h"
+#include "SkView.h"
#include "sk_tool_utils.h"
@@ -128,12 +130,12 @@ protected:
SkMatrix m;
m.setRSXform(xforms[i]);
- // TODO: correctly pull out the pure rotation
- SkVector invNormRotation = { m[SkMatrix::kMScaleX], m[SkMatrix::kMSkewY] };
- SkASSERT(SkScalarNearlyEqual(invNormRotation.lengthSqd(), SK_Scalar1));
-
- paint.setShader(SkLightingShader::Make(fAtlas, fAtlas, fLights,
- invNormRotation, &diffMat, &normalMat));
+ sk_sp<SkShader> normalMap = SkMakeBitmapShader(fAtlas, SkShader::kClamp_TileMode,
+ SkShader::kClamp_TileMode, &normalMat, nullptr);
+ sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(
+ std::move(normalMap), m);
+ paint.setShader(SkLightingShader::Make(fAtlas, fLights, &diffMat,
+ std::move(normalSource)));
canvas->save();
canvas->setMatrix(m);
diff --git a/src/core/SkLightingShader.cpp b/src/core/SkLightingShader.cpp
index f32aa9f411..b40f4a725b 100644
--- a/src/core/SkLightingShader.cpp
+++ b/src/core/SkLightingShader.cpp
@@ -45,34 +45,18 @@ public:
/** Create a new lighting shader that uses the provided normal map and
lights to light the diffuse bitmap.
@param diffuse the diffuse bitmap
- @param normal the normal map
@param lights the lights applied to the normal map
- @param invNormRotation rotation applied to the normal map's normals
@param diffLocalM the local matrix for the diffuse coordinates
- @param normLocalM the local matrix for the normal coordinates
- @param normalSource the normal source for GPU computations
+ @param normalSource the source of normals for lighting computation
*/
- SkLightingShaderImpl(const SkBitmap& diffuse, const SkBitmap& normal,
+ SkLightingShaderImpl(const SkBitmap& diffuse,
const sk_sp<SkLights> lights,
- const SkVector& invNormRotation,
- const SkMatrix* diffLocalM, const SkMatrix* normLocalM,
+ const SkMatrix* diffLocalM,
sk_sp<SkNormalSource> normalSource)
: INHERITED(diffLocalM)
, fDiffuseMap(diffuse)
- , fNormalMap(normal)
, fLights(std::move(lights))
- , fInvNormRotation(invNormRotation) {
-
- if (normLocalM) {
- fNormLocalMatrix = *normLocalM;
- } else {
- fNormLocalMatrix.reset();
- }
- // Pre-cache so future calls to fNormLocalMatrix.getType() are threadsafe.
- (void)fNormLocalMatrix.getType();
-
- fNormalSource = std::move(normalSource);
- }
+ , fNormalSource(std::move(normalSource)) {}
bool isOpaque() const override;
@@ -117,13 +101,8 @@ protected:
private:
SkBitmap fDiffuseMap;
- SkBitmap fNormalMap;
-
sk_sp<SkLights> fLights;
- SkMatrix fNormLocalMatrix;
- SkVector fInvNormRotation;
-
sk_sp<SkNormalSource> fNormalSource;
friend class SkLightingShader;
@@ -327,8 +306,6 @@ sk_sp<GrFragmentProcessor> SkLightingShaderImpl::asFragmentProcessor(
// we assume diffuse and normal maps have same width and height
// TODO: support different sizes, will be addressed when diffuse maps are factored out of
// SkLightingShader in a future CL
- SkASSERT(fDiffuseMap.width() == fNormalMap.width() &&
- fDiffuseMap.height() == fNormalMap.height());
SkMatrix diffM;
if (!make_mat(fDiffuseMap, this->getLocalMatrix(), localMatrix, &diffM)) {
@@ -500,26 +477,12 @@ sk_sp<SkFlattenable> SkLightingShaderImpl::CreateProc(SkReadBuffer& buf) {
diffLocalM.reset();
}
- SkMatrix normLocalM;
- bool hasNormLocalM = buf.readBool();
- if (hasNormLocalM) {
- buf.readMatrix(&normLocalM);
- } else {
- normLocalM.reset();
- }
-
SkBitmap diffuse;
if (!buf.readBitmap(&diffuse)) {
return nullptr;
}
diffuse.setImmutable();
- SkBitmap normal;
- if (!buf.readBitmap(&normal)) {
- return nullptr;
- }
- normal.setImmutable();
-
int numLights = buf.readInt();
SkLights::Builder builder;
@@ -545,28 +508,16 @@ sk_sp<SkFlattenable> SkLightingShaderImpl::CreateProc(SkReadBuffer& buf) {
sk_sp<SkLights> lights(builder.finish());
- SkVector invNormRotation = {1,0};
- if (!buf.isVersionLT(SkReadBuffer::kLightingShaderWritesInvNormRotation)) {
- invNormRotation = buf.readPoint();
- }
-
sk_sp<SkNormalSource> normalSource(buf.readFlattenable<SkNormalSource>());
- return sk_make_sp<SkLightingShaderImpl>(diffuse, normal, std::move(lights), invNormRotation,
- &diffLocalM, &normLocalM, std::move(normalSource));
+ return sk_make_sp<SkLightingShaderImpl>(diffuse, std::move(lights), &diffLocalM,
+ std::move(normalSource));
}
void SkLightingShaderImpl::flatten(SkWriteBuffer& buf) const {
this->INHERITED::flatten(buf);
- bool hasNormLocalM = !fNormLocalMatrix.isIdentity();
- buf.writeBool(hasNormLocalM);
- if (hasNormLocalM) {
- buf.writeMatrix(fNormLocalMatrix);
- }
-
buf.writeBitmap(fDiffuseMap);
- buf.writeBitmap(fNormalMap);
buf.writeInt(fLights->numLights());
for (int l = 0; l < fLights->numLights(); ++l) {
@@ -580,7 +531,6 @@ void SkLightingShaderImpl::flatten(SkWriteBuffer& buf) const {
buf.writeScalarArray(&light.dir().fX, 3);
}
}
- buf.writePoint(fInvNormRotation);
buf.writeFlattenable(fNormalSource.get());
}
@@ -625,27 +575,21 @@ SkShader::Context* SkLightingShaderImpl::onCreateContext(const ContextRec& rec,
///////////////////////////////////////////////////////////////////////////////
-sk_sp<SkShader> SkLightingShader::Make(const SkBitmap& diffuse, const SkBitmap& normal,
+sk_sp<SkShader> SkLightingShader::Make(const SkBitmap& diffuse,
sk_sp<SkLights> lights,
- const SkVector& invNormRotation,
- const SkMatrix* diffLocalM, const SkMatrix* normLocalM) {
- if (diffuse.isNull() || SkBitmapProcShader::BitmapIsTooBig(diffuse) ||
- normal.isNull() || SkBitmapProcShader::BitmapIsTooBig(normal) ||
- diffuse.width() != normal.width() ||
- diffuse.height() != normal.height()) {
+ const SkMatrix* diffLocalM,
+ sk_sp<SkNormalSource> normalSource) {
+ if (diffuse.isNull() || SkBitmapProcShader::BitmapIsTooBig(diffuse)) {
return nullptr;
}
- SkASSERT(SkScalarNearlyEqual(invNormRotation.lengthSqd(), SK_Scalar1));
-
- // TODO: support other tile modes
- sk_sp<SkShader> mapShader = SkMakeBitmapShader(normal, SkShader::kClamp_TileMode,
- SkShader::kClamp_TileMode, normLocalM, nullptr);
- sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(mapShader,
- invNormRotation);
+ if (!normalSource) {
+ // TODO: Use a default implementation of normalSource instead
+ return nullptr;
+ }
- return sk_make_sp<SkLightingShaderImpl>(diffuse, normal, std::move(lights),
- invNormRotation, diffLocalM, normLocalM, std::move(normalSource));
+ return sk_make_sp<SkLightingShaderImpl>(diffuse, std::move(lights), diffLocalM,
+ std::move(normalSource));
}
///////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/SkLightingShader.h b/src/core/SkLightingShader.h
index e21b94266e..f10382368a 100644
--- a/src/core/SkLightingShader.h
+++ b/src/core/SkLightingShader.h
@@ -13,45 +13,33 @@
class SkBitmap;
class SkMatrix;
+class SkNormalSource;
class SK_API SkLightingShader {
public:
- /** Returns a shader that lights the diffuse and normal maps with a set of lights.
+ /** Returns a shader that lights the diffuse map using the normals and a set of lights.
It returns a shader with a reference count of 1.
The caller should decrement the shader's reference count when done with the shader.
It is an error for count to be < 2.
@param diffuse the diffuse bitmap
- @param normal the normal map
@param lights the lights applied to the normal map
- @param invNormRotation rotation applied to the normal map's normals
@param diffLocalMatrix the local matrix for the diffuse map (transform from
texture coordinates to shape source coordinates). nullptr is
interpreted as an identity matrix.
- @param normLocalMatrix the local matrix for the normal map (transform from
- texture coordinates to shape source coordinates). nullptr is
- interpreted as an identity matrix.
+ @param normalSource the source for the normals
nullptr will be returned if:
- either 'diffuse' or 'normal' are empty
- either 'diffuse' or 'normal' are too big (> 65535 on a side)
- 'diffuse' and 'normal' aren't the same size
+ 'diffuse' is empty
+ 'diffuse' is too big (> 65535 on any side)
The lighting equation is currently:
result = LightColor * DiffuseColor * (Normal * LightDir) + AmbientColor
- The normal map is currently assumed to be an 8888 image where the normal at a texel
- is retrieved by:
- N.x = R-127;
- N.y = G-127;
- N.z = B-127;
- N.normalize();
- The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is
- (127, 127, 0).
*/
- static sk_sp<SkShader> Make(const SkBitmap& diffuse, const SkBitmap& normal,
- sk_sp<SkLights> lights, const SkVector& invNormRotation,
- const SkMatrix* diffLocalMatrix, const SkMatrix* normLocalMatrix);
+ static sk_sp<SkShader> Make(const SkBitmap& diffuse, sk_sp<SkLights> lights,
+ const SkMatrix* diffLocalMatrix,
+ sk_sp<SkNormalSource> normalSource);
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
};
diff --git a/src/core/SkNormalSource.cpp b/src/core/SkNormalSource.cpp
index 2f52530382..52bb4adaa7 100644
--- a/src/core/SkNormalSource.cpp
+++ b/src/core/SkNormalSource.cpp
@@ -8,6 +8,7 @@
#include "SkError.h"
#include "SkErrorInternals.h"
#include "SkLightingShader.h"
+#include "SkMatrix.h"
#include "SkNormalSource.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
@@ -19,9 +20,9 @@ SkNormalSource::~SkNormalSource() {}
class NormalMapSourceImpl : public SkNormalSource {
public:
- NormalMapSourceImpl(sk_sp<SkShader> mapShader, const SkVector &normRotation)
+ NormalMapSourceImpl(sk_sp<SkShader> mapShader, const SkMatrix& invCTM)
: fMapShader(std::move(mapShader))
- , fNormRotation(normRotation) {}
+ , fInvCTM(invCTM) {}
#if SK_SUPPORT_GPU
sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext*,
@@ -58,7 +59,7 @@ private:
};
sk_sp<SkShader> fMapShader;
- SkVector fNormRotation;
+ SkMatrix fInvCTM; // Inverse of the canvas total matrix, used for rotating normals.
friend class SkNormalSource;
@@ -78,8 +79,8 @@ private:
class NormalMapFP : public GrFragmentProcessor {
public:
- NormalMapFP(sk_sp<GrFragmentProcessor> mapFP, const SkVector& normRotation)
- : fNormRotation(normRotation) {
+ NormalMapFP(sk_sp<GrFragmentProcessor> mapFP, const SkMatrix& invCTM)
+ : fInvCTM(invCTM) {
this->registerChildProcessor(mapFP);
this->initClassID<NormalMapFP>();
@@ -87,34 +88,46 @@ public:
class GLSLNormalMapFP : public GrGLSLFragmentProcessor {
public:
- GLSLNormalMapFP() {
- fNormRotation.set(0.0f, 0.0f);
- }
+ GLSLNormalMapFP()
+ : fColumnMajorInvCTM22{0.0f} {}
void emitCode(EmitArgs& args) override {
-
GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// add uniform
const char* xformUniName = nullptr;
- fXformUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
- kVec2f_GrSLType, kDefault_GrSLPrecision,
- "Xform", &xformUniName);
+ fXformUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kMat22f_GrSLType,
+ kDefault_GrSLPrecision, "Xform", &xformUniName);
SkString dstNormalColorName("dstNormalColor");
this->emitChild(0, nullptr, &dstNormalColorName, args);
- fragBuilder->codeAppendf("vec3 normal = %s.rgb - vec3(0.5);",
+ fragBuilder->codeAppendf("vec3 normal = normalize(%s.rgb - vec3(0.5));",
dstNormalColorName.c_str());
// TODO: inverse map the light direction vectors in the vertex shader rather than
// transforming all the normals here!
- fragBuilder->codeAppendf(
- "mat3 m = mat3(%s.x, -%s.y, 0.0, %s.y, %s.x, 0.0, 0.0, 0.0, 1.0);",
- xformUniName, xformUniName, xformUniName, xformUniName);
- fragBuilder->codeAppend("normal = normalize(m*normal);");
- fragBuilder->codeAppendf("%s = vec4(normal, 0);", args.fOutputColor);
+ // If there's no x & y components, return (0, 0, +/- 1) instead to avoid division by 0
+ fragBuilder->codeAppend( "if (abs(normal.z) > 0.9999) {");
+ fragBuilder->codeAppendf(" %s = normalize(vec4(0.0, 0.0, normal.z, 0.0));",
+ args.fOutputColor);
+ // Else, Normalizing the transformed X and Y, while keeping constant both Z and the
+ // vector's angle in the XY plane. This maintains the "slope" for the surface while
+ // appropriately rotating the normal for any anisotropic scaling that occurs.
+ // Here, we call scaling factor the number that must divide the transformed X and Y so
+ // that the normal's length remains equal to 1.
+ fragBuilder->codeAppend( "} else {");
+ fragBuilder->codeAppendf(" vec2 transformed = %s * normal.xy;",
+ xformUniName);
+ fragBuilder->codeAppend( " float scalingFactorSquared = "
+ "( (transformed.x * transformed.x) "
+ "+ (transformed.y * transformed.y) )"
+ "/(1.0 - (normal.z * normal.z));");
+ fragBuilder->codeAppendf(" %s = vec4(transformed*inversesqrt(scalingFactorSquared),"
+ "normal.z, 0.0);",
+ args.fOutputColor);
+ fragBuilder->codeAppend( "}");
}
static void GenKey(const GrProcessor& proc, const GrGLSLCaps&,
@@ -126,15 +139,16 @@ public:
void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {
const NormalMapFP& normalMapFP = proc.cast<NormalMapFP>();
- const SkVector& normRotation = normalMapFP.normRotation();
- if (normRotation != fNormRotation) {
- pdman.set2fv(fXformUni, 1, &normRotation.fX);
- fNormRotation = normRotation;
- }
+ const SkMatrix& invCTM = normalMapFP.invCTM();
+ fColumnMajorInvCTM22[0] = invCTM.get(SkMatrix::kMScaleX);
+ fColumnMajorInvCTM22[1] = invCTM.get(SkMatrix::kMSkewY);
+ fColumnMajorInvCTM22[2] = invCTM.get(SkMatrix::kMSkewX);
+ fColumnMajorInvCTM22[3] = invCTM.get(SkMatrix::kMScaleY);
+ pdman.setMatrix2f(fXformUni, fColumnMajorInvCTM22);
}
private:
- SkVector fNormRotation;
+ float fColumnMajorInvCTM22[4];
GrGLSLProgramDataManager::UniformHandle fXformUni;
};
@@ -148,17 +162,17 @@ public:
inout->setToUnknown(GrInvariantOutput::ReadInput::kWillNot_ReadInput);
}
- const SkVector& normRotation() const { return fNormRotation; }
+ const SkMatrix& invCTM() const { return fInvCTM; }
private:
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalMapFP; }
bool onIsEqual(const GrFragmentProcessor& proc) const override {
const NormalMapFP& normalMapFP = proc.cast<NormalMapFP>();
- return fNormRotation == normalMapFP.fNormRotation;
+ return fInvCTM == normalMapFP.fInvCTM;
}
- SkVector fNormRotation;
+ SkMatrix fInvCTM;
};
sk_sp<GrFragmentProcessor> NormalMapSourceImpl::asFragmentProcessor(
@@ -171,7 +185,7 @@ sk_sp<GrFragmentProcessor> NormalMapSourceImpl::asFragmentProcessor(
sk_sp<GrFragmentProcessor> mapFP = fMapShader->asFragmentProcessor(context, viewM,
localMatrix, filterQuality, gammaTreatment);
- return sk_make_sp<NormalMapFP>(std::move(mapFP), fNormRotation);
+ return sk_make_sp<NormalMapFP>(std::move(mapFP), fInvCTM);
}
#endif // SK_SUPPORT_GPU
@@ -239,11 +253,28 @@ void NormalMapSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[]
SkIntToScalar(SkGetPackedB32(tmpNormalColors[i])) - 127.0f);
tempNorm.normalize();
- output[i].fX = fSource.fNormRotation.fX * tempNorm.fX +
- fSource.fNormRotation.fY * tempNorm.fY;
- output[i].fY = -fSource.fNormRotation.fY * tempNorm.fX +
- fSource.fNormRotation.fX * tempNorm.fY;
- output[i].fZ = tempNorm.fZ;
+ if (!SkScalarNearlyEqual(SkScalarAbs(tempNorm.fZ), 1.0f)) {
+ SkVector transformed = fSource.fInvCTM.mapVector(tempNorm.fX, tempNorm.fY);
+
+ // Normalizing the transformed X and Y, while keeping constant both Z and the
+ // vector's angle in the XY plane. This maintains the "slope" for the surface while
+ // appropriately rotating the normal for any anisotropic scaling that occurs.
+ // Here, we call scaling factor the number that must divide the transformed X and Y
+ // so that the normal's length remains equal to 1.
+ SkScalar scalingFactorSquared =
+ (SkScalarSquare(transformed.fX) + SkScalarSquare(transformed.fY))
+ / (1.0f - SkScalarSquare(tempNorm.fZ));
+ SkScalar invScalingFactor = SkScalarInvert(SkScalarSqrt(scalingFactorSquared));
+
+ output[i].fX = transformed.fX * invScalingFactor;
+ output[i].fY = transformed.fY * invScalingFactor;
+ output[i].fZ = tempNorm.fZ;
+ } else {
+ output[i] = {0.0f, 0.0f, tempNorm.fZ};
+ output[i].normalize();
+ }
+
+ SkASSERT(SkScalarNearlyEqual(output[i].length(), 1.0f))
}
output += n;
@@ -258,31 +289,29 @@ sk_sp<SkFlattenable> NormalMapSourceImpl::CreateProc(SkReadBuffer& buf) {
sk_sp<SkShader> mapShader = buf.readFlattenable<SkShader>();
- SkVector normRotation = {1,0};
- if (!buf.isVersionLT(SkReadBuffer::kLightingShaderWritesInvNormRotation)) {
- normRotation = buf.readPoint();
- }
+ SkMatrix invCTM;
+ buf.readMatrix(&invCTM);
- return sk_make_sp<NormalMapSourceImpl>(std::move(mapShader), normRotation);
+ return sk_make_sp<NormalMapSourceImpl>(std::move(mapShader), invCTM);
}
void NormalMapSourceImpl::flatten(SkWriteBuffer& buf) const {
this->INHERITED::flatten(buf);
buf.writeFlattenable(fMapShader.get());
- buf.writePoint(fNormRotation);
+ buf.writeMatrix(fInvCTM);
}
////////////////////////////////////////////////////////////////////////////
-sk_sp<SkNormalSource> SkNormalSource::MakeFromNormalMap(sk_sp<SkShader> map,
- const SkVector &normRotation) {
- SkASSERT(SkScalarNearlyEqual(normRotation.lengthSqd(), SK_Scalar1));
- if (!map) {
+sk_sp<SkNormalSource> SkNormalSource::MakeFromNormalMap(sk_sp<SkShader> map, const SkMatrix& ctm) {
+ SkMatrix invCTM;
+
+ if (!ctm.invert(&invCTM) || !map) {
return nullptr;
}
- return sk_make_sp<NormalMapSourceImpl>(std::move(map), normRotation);
+ return sk_make_sp<NormalMapSourceImpl>(std::move(map), invCTM);
}
////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/SkNormalSource.h b/src/core/SkNormalSource.h
index 0d0c672fa3..7517770800 100644
--- a/src/core/SkNormalSource.h
+++ b/src/core/SkNormalSource.h
@@ -10,8 +10,7 @@
#include "SkFlattenable.h"
-/** Abstract class that generates or reads in normals for use by SkLightingShader. Not to be
- used as part of the API yet. Used internally by SkLightingShader.
+/** Abstract class that generates or reads in normals for use by SkLightingShader.
*/
class SK_API SkNormalSource : public SkFlattenable {
public:
@@ -49,11 +48,9 @@ public:
virtual size_t providerSize(const SkShader::ContextRec&) const = 0;
/** Returns a normal source that provides normals sourced from the the normal map argument.
- Not to be used as part of the API yet. Used internally by SkLightingShader.
- @param map a shader that outputs the normal map
- @param normRotation rotation applied to the normal map's normals, in the
- [cos a, sin a] form.
+ @param map a shader that outputs the normal map
+ @param ctm the current canvas' total matrix, used to rotate normals when necessary.
nullptr will be returned if 'map' is null
@@ -66,8 +63,7 @@ public:
The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is
(127, 127, 0).
*/
- static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map,
- const SkVector& normRotation);
+ static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map, const SkMatrix& ctm);
SK_DEFINE_FLATTENABLE_TYPE(SkNormalSource)
SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
diff --git a/tests/SerializationTest.cpp b/tests/SerializationTest.cpp
index e4e1a7acd7..1e96eefd54 100644
--- a/tests/SerializationTest.cpp
+++ b/tests/SerializationTest.cpp
@@ -7,6 +7,7 @@
#include "Resources.h"
#include "SkAnnotationKeys.h"
+#include "SkBitmapProcShader.h"
#include "SkCanvas.h"
#include "SkFixed.h"
#include "SkFontDescriptor.h"
@@ -14,6 +15,7 @@
#include "SkImageSource.h"
#include "SkLightingShader.h"
#include "SkMallocPixelRef.h"
+#include "SkNormalSource.h"
#include "SkOSFile.h"
#include "SkPictureRecorder.h"
#include "SkTableColorFilter.h"
@@ -573,13 +575,18 @@ DEF_TEST(Serialization, reporter) {
SkRect r = SkRect::MakeWH(SkIntToScalar(kTexSize), SkIntToScalar(kTexSize));
matrix.setRectToRect(bitmapBounds, r, SkMatrix::kFill_ScaleToFit);
- SkVector invNormRotation = { SkScalarSqrt(0.3f), SkScalarSqrt(0.7f) };
+ SkMatrix ctm;
+ ctm.setRotate(45);
SkBitmap normals;
normals.allocN32Pixels(kTexSize, kTexSize);
sk_tool_utils::create_frustum_normal_map(&normals, SkIRect::MakeWH(kTexSize, kTexSize));
- sk_sp<SkShader> lightingShader = SkLightingShader::Make(diffuse, normals, fLights,
- invNormRotation, &matrix, &matrix);
+ sk_sp<SkShader> normalMap = SkMakeBitmapShader(normals, SkShader::kClamp_TileMode,
+ SkShader::kClamp_TileMode, &matrix, nullptr);
+ sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeFromNormalMap(std::move(normalMap),
+ ctm);
+ sk_sp<SkShader> lightingShader = SkLightingShader::Make(diffuse, fLights, &matrix,
+ std::move(normalSource));
SkAutoTUnref<SkShader>(TestFlattenableSerialization(lightingShader.get(), true, reporter));
// TODO test equality?
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 12:52:02 +0000