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-rw-r--r--gpu/effects/GrTextureDomainEffect.cpp244
1 files changed, 244 insertions, 0 deletions
diff --git a/gpu/effects/GrTextureDomainEffect.cpp b/gpu/effects/GrTextureDomainEffect.cpp
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+++ b/gpu/effects/GrTextureDomainEffect.cpp
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+/*
+ * 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 "GrTextureDomainEffect.h"
+#include "GrSimpleTextureEffect.h"
+#include "GrTBackendEffectFactory.h"
+#include "gl/GrGLEffect.h"
+#include "gl/GrGLEffectMatrix.h"
+#include "SkFloatingPoint.h"
+
+class GrGLTextureDomainEffect : public GrGLEffect {
+public:
+ GrGLTextureDomainEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
+
+ virtual void emitCode(GrGLShaderBuilder*,
+ const GrDrawEffect&,
+ EffectKey,
+ const char* outputColor,
+ const char* inputColor,
+ const TextureSamplerArray&) SK_OVERRIDE;
+
+ virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
+
+ static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
+
+private:
+ GrGLUniformManager::UniformHandle fNameUni;
+ GrGLEffectMatrix fEffectMatrix;
+ GrGLfloat fPrevDomain[4];
+
+ typedef GrGLEffect INHERITED;
+};
+
+GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrBackendEffectFactory& factory,
+ const GrDrawEffect& drawEffect)
+ : INHERITED(factory)
+ , fNameUni(GrGLUniformManager::kInvalidUniformHandle)
+ , fEffectMatrix(drawEffect.castEffect<GrTextureDomainEffect>().coordsType()) {
+ fPrevDomain[0] = SK_FloatNaN;
+}
+
+void GrGLTextureDomainEffect::emitCode(GrGLShaderBuilder* builder,
+ const GrDrawEffect& drawEffect,
+ EffectKey key,
+ const char* outputColor,
+ const char* inputColor,
+ const TextureSamplerArray& samplers) {
+ const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
+
+ const char* coords;
+ fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
+ const char* domain;
+ fNameUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
+ kVec4f_GrSLType, "TexDom", &domain);
+ if (GrTextureDomainEffect::kClamp_WrapMode == texDom.wrapMode()) {
+
+ builder->fsCodeAppendf("\tvec2 clampCoord = clamp(%s, %s.xy, %s.zw);\n",
+ coords, domain, domain);
+
+ builder->fsCodeAppendf("\t%s = ", outputColor);
+ builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
+ inputColor,
+ samplers[0],
+ "clampCoord");
+ builder->fsCodeAppend(";\n");
+ } else {
+ GrAssert(GrTextureDomainEffect::kDecal_WrapMode == texDom.wrapMode());
+
+ if (kImagination_GrGLVendor == builder->ctxInfo().vendor()) {
+ // On the NexusS and GalaxyNexus, the other path (with the 'any'
+ // call) causes the compilation error "Calls to any function that
+ // may require a gradient calculation inside a conditional block
+ // may return undefined results". This appears to be an issue with
+ // the 'any' call since even the simple "result=black; if (any())
+ // result=white;" code fails to compile.
+ builder->fsCodeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
+ builder->fsCodeAppend("\tvec4 inside = ");
+ builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
+ inputColor,
+ samplers[0],
+ coords);
+ builder->fsCodeAppend(";\n");
+
+ builder->fsCodeAppendf("\tfloat x = abs(2.0*(%s.x - %s.x)/(%s.z - %s.x) - 1.0);\n",
+ coords, domain, domain, domain);
+ builder->fsCodeAppendf("\tfloat y = abs(2.0*(%s.y - %s.y)/(%s.w - %s.y) - 1.0);\n",
+ coords, domain, domain, domain);
+ builder->fsCodeAppend("\tfloat blend = step(1.0, max(x, y));\n");
+ builder->fsCodeAppendf("\t%s = mix(inside, outside, blend);\n", outputColor);
+ } else {
+ builder->fsCodeAppend("\tbvec4 outside;\n");
+ builder->fsCodeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", coords, domain);
+ builder->fsCodeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", coords, domain);
+ builder->fsCodeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ", outputColor);
+ builder->appendTextureLookupAndModulate(GrGLShaderBuilder::kFragment_ShaderType,
+ inputColor,
+ samplers[0],
+ coords);
+ builder->fsCodeAppend(";\n");
+ }
+ }
+}
+
+void GrGLTextureDomainEffect::setData(const GrGLUniformManager& uman,
+ const GrDrawEffect& drawEffect) {
+ const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
+ const SkRect& domain = texDom.domain();
+
+ float values[4] = {
+ SkScalarToFloat(domain.left()),
+ SkScalarToFloat(domain.top()),
+ SkScalarToFloat(domain.right()),
+ SkScalarToFloat(domain.bottom())
+ };
+ // vertical flip if necessary
+ if (kBottomLeft_GrSurfaceOrigin == texDom.texture(0)->origin()) {
+ values[1] = 1.0f - values[1];
+ values[3] = 1.0f - values[3];
+ // The top and bottom were just flipped, so correct the ordering
+ // of elements so that values = (l, t, r, b).
+ SkTSwap(values[1], values[3]);
+ }
+ if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) {
+ uman.set4fv(fNameUni, 0, 1, values);
+ memcpy(fPrevDomain, values, 4 * sizeof(GrGLfloat));
+ }
+ fEffectMatrix.setData(uman,
+ texDom.getMatrix(),
+ drawEffect,
+ texDom.texture(0));
+}
+
+GrGLEffect::EffectKey GrGLTextureDomainEffect::GenKey(const GrDrawEffect& drawEffect,
+ const GrGLCaps&) {
+ const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
+ EffectKey key = texDom.wrapMode();
+ key <<= GrGLEffectMatrix::kKeyBits;
+ EffectKey matrixKey = GrGLEffectMatrix::GenKey(texDom.getMatrix(),
+ drawEffect,
+ texDom.coordsType(),
+ texDom.texture(0));
+ return key | matrixKey;
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrEffectRef* GrTextureDomainEffect::Create(GrTexture* texture,
+ const SkMatrix& matrix,
+ const SkRect& domain,
+ WrapMode wrapMode,
+ GrTextureParams::FilterMode filterMode,
+ CoordsType coordsType) {
+ static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
+ if (kClamp_WrapMode == wrapMode && domain.contains(kFullRect)) {
+ return GrSimpleTextureEffect::Create(texture, matrix, filterMode);
+ } else {
+ SkRect clippedDomain;
+ // We don't currently handle domains that are empty or don't intersect the texture.
+ // It is OK if the domain rect is a line or point, but it should not be inverted. We do not
+ // handle rects that do not intersect the [0..1]x[0..1] rect.
+ GrAssert(domain.fLeft <= domain.fRight);
+ GrAssert(domain.fTop <= domain.fBottom);
+ clippedDomain.fLeft = SkMaxScalar(domain.fLeft, kFullRect.fLeft);
+ clippedDomain.fRight = SkMinScalar(domain.fRight, kFullRect.fRight);
+ clippedDomain.fTop = SkMaxScalar(domain.fTop, kFullRect.fTop);
+ clippedDomain.fBottom = SkMinScalar(domain.fBottom, kFullRect.fBottom);
+ GrAssert(clippedDomain.fLeft <= clippedDomain.fRight);
+ GrAssert(clippedDomain.fTop <= clippedDomain.fBottom);
+
+ AutoEffectUnref effect(SkNEW_ARGS(GrTextureDomainEffect, (texture,
+ matrix,
+ clippedDomain,
+ wrapMode,
+ filterMode,
+ coordsType)));
+ return CreateEffectRef(effect);
+
+ }
+}
+
+GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture,
+ const SkMatrix& matrix,
+ const SkRect& domain,
+ WrapMode wrapMode,
+ GrTextureParams::FilterMode filterMode,
+ CoordsType coordsType)
+ : GrSingleTextureEffect(texture, matrix, filterMode, coordsType)
+ , fWrapMode(wrapMode)
+ , fTextureDomain(domain) {
+}
+
+GrTextureDomainEffect::~GrTextureDomainEffect() {
+
+}
+
+const GrBackendEffectFactory& GrTextureDomainEffect::getFactory() const {
+ return GrTBackendEffectFactory<GrTextureDomainEffect>::getInstance();
+}
+
+bool GrTextureDomainEffect::onIsEqual(const GrEffect& sBase) const {
+ const GrTextureDomainEffect& s = CastEffect<GrTextureDomainEffect>(sBase);
+ return this->hasSameTextureParamsMatrixAndCoordsType(s) &&
+ this->fTextureDomain == s.fTextureDomain;
+}
+
+void GrTextureDomainEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
+ if (kDecal_WrapMode == fWrapMode) {
+ *validFlags = 0;
+ } else {
+ this->updateConstantColorComponentsForModulation(color, validFlags);
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GR_DEFINE_EFFECT_TEST(GrTextureDomainEffect);
+
+GrEffectRef* GrTextureDomainEffect::TestCreate(SkMWCRandom* random,
+ GrContext*,
+ const GrDrawTargetCaps&,
+ GrTexture* textures[]) {
+ int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
+ GrEffectUnitTest::kAlphaTextureIdx;
+ SkRect domain;
+ domain.fLeft = random->nextUScalar1();
+ domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1);
+ domain.fTop = random->nextUScalar1();
+ domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1);
+ WrapMode wrapMode = random->nextBool() ? kClamp_WrapMode : kDecal_WrapMode;
+ const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
+ bool bilerp = random->nextBool();
+ CoordsType coords = random->nextBool() ? kLocal_CoordsType : kPosition_CoordsType;
+ return GrTextureDomainEffect::Create(textures[texIdx],
+ matrix,
+ domain,
+ wrapMode,
+ bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
+ coords);
+}
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