| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrTextureDomainEffect_DEFINED |
| #define GrTextureDomainEffect_DEFINED |
| |
| #include "GrCoordTransform.h" |
| #include "GrFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| |
| class GrGLProgramBuilder; |
| class GrGLSLShaderBuilder; |
| class GrInvariantOutput; |
| class GrGLSLUniformHandler; |
| struct SkRect; |
| |
| /** |
| * Limits a texture's lookup coordinates to a domain. Samples outside the domain are either clamped |
| * the edge of the domain or result in a half4 of zeros (decal mode). The domain is clipped to |
| * normalized texture coords ([0,1]x[0,1] square). Bilinear filtering can cause texels outside the |
| * domain to affect the read value unless the caller considers this when calculating the domain. |
| */ |
| class GrTextureDomain { |
| public: |
| enum Mode { |
| // Ignore the texture domain rectangle. |
| kIgnore_Mode, |
| // Clamp texture coords to the domain rectangle. |
| kClamp_Mode, |
| // Treat the area outside the domain rectangle as fully transparent. |
| kDecal_Mode, |
| // Wrap texture coordinates. NOTE: filtering may not work as expected because Bilerp will |
| // read texels outside of the domain. We could perform additional texture reads and filter |
| // in the shader, but are not currently doing this for performance reasons |
| kRepeat_Mode, |
| |
| kLastMode = kRepeat_Mode |
| }; |
| static const int kModeCount = kLastMode + 1; |
| |
| static const GrTextureDomain& IgnoredDomain() { |
| static const GrTextureDomain gDomain((GrTextureProxy*)nullptr, |
| SkRect::MakeEmpty(), kIgnore_Mode); |
| return gDomain; |
| } |
| |
| /** |
| * @param index Pass a value >= 0 if using multiple texture domains in the same effect. |
| * It is used to keep inserted variables from causing name collisions. |
| */ |
| GrTextureDomain(GrTextureProxy*, const SkRect& domain, Mode, int index = -1); |
| |
| GrTextureDomain(const GrTextureDomain&) = default; |
| |
| const SkRect& domain() const { return fDomain; } |
| Mode mode() const { return fMode; } |
| |
| /* Computes a domain that bounds all the texels in texelRect. Note that with bilerp enabled |
| texels neighboring the domain may be read. */ |
| static const SkRect MakeTexelDomain(const SkIRect& texelRect) { |
| return SkRect::Make(texelRect); |
| } |
| |
| static const SkRect MakeTexelDomainForMode(const SkIRect& texelRect, Mode mode) { |
| // For Clamp mode, inset by half a texel. |
| SkScalar inset = (mode == kClamp_Mode && !texelRect.isEmpty()) ? SK_ScalarHalf : 0; |
| return SkRect::MakeLTRB(texelRect.fLeft + inset, texelRect.fTop + inset, |
| texelRect.fRight - inset, texelRect.fBottom - inset); |
| } |
| |
| bool operator==(const GrTextureDomain& that) const { |
| return fMode == that.fMode && (kIgnore_Mode == fMode || fDomain == that.fDomain); |
| } |
| |
| /** |
| * A GrGLSLFragmentProcessor subclass that corresponds to a GrProcessor subclass that uses |
| * GrTextureDomain should include this helper. It generates the texture domain GLSL, produces |
| * the part of the effect key that reflects the texture domain code, and performs the uniform |
| * uploads necessary for texture domains. |
| */ |
| class GLDomain { |
| public: |
| GLDomain() { |
| for (int i = 0; i < kPrevDomainCount; i++) { |
| fPrevDomain[i] = SK_FloatNaN; |
| } |
| } |
| |
| /** |
| * Call this from GrGLSLFragmentProcessor::emitCode() to sample the texture W.R.T. the |
| * domain and mode. |
| * |
| * @param outcolor name of half4 variable to hold the sampled color. |
| * @param inCoords name of float2 variable containing the coords to be used with the domain. |
| * It is assumed that this is a variable and not an expression. |
| * @param inModulateColor if non-nullptr the sampled color will be modulated with this |
| * expression before being written to outColor. |
| */ |
| void sampleTexture(GrGLSLShaderBuilder* builder, |
| GrGLSLUniformHandler* uniformHandler, |
| const GrShaderCaps* shaderCaps, |
| const GrTextureDomain& textureDomain, |
| const char* outColor, |
| const SkString& inCoords, |
| GrGLSLFragmentProcessor::SamplerHandle sampler, |
| const char* inModulateColor = nullptr); |
| |
| /** |
| * Call this from GrGLSLFragmentProcessor::setData() to upload uniforms necessary for the |
| * texture domain. The rectangle is automatically adjusted to account for the texture's |
| * origin. |
| */ |
| void setData(const GrGLSLProgramDataManager&, const GrTextureDomain&, GrSurfaceProxy*); |
| |
| enum { |
| kDomainKeyBits = 2, // See DomainKey(). |
| }; |
| |
| /** |
| * GrGLSLFragmentProcessor::GenKey() must call this and include the returned value in it's |
| * computed key. The returned will be limited to the lower kDomainKeyBits bits. |
| */ |
| static uint32_t DomainKey(const GrTextureDomain& domain) { |
| GR_STATIC_ASSERT(kModeCount <= (1 << kDomainKeyBits)); |
| return domain.mode(); |
| } |
| |
| private: |
| static const int kPrevDomainCount = 4; |
| SkDEBUGCODE(Mode fMode;) |
| SkDEBUGCODE(bool fHasMode = false;) |
| GrGLSLProgramDataManager::UniformHandle fDomainUni; |
| SkString fDomainName; |
| float fPrevDomain[kPrevDomainCount]; |
| }; |
| |
| protected: |
| Mode fMode; |
| SkRect fDomain; |
| int fIndex; |
| }; |
| |
| /** |
| * A basic texture effect that uses GrTextureDomain. |
| */ |
| class GrTextureDomainEffect : public GrFragmentProcessor { |
| public: |
| static std::unique_ptr<GrFragmentProcessor> Make(sk_sp<GrTextureProxy>, |
| const SkMatrix&, |
| const SkRect& domain, |
| GrTextureDomain::Mode, |
| GrSamplerState::Filter filterMode); |
| |
| const char* name() const override { return "TextureDomain"; } |
| |
| std::unique_ptr<GrFragmentProcessor> clone() const override { |
| return std::unique_ptr<GrFragmentProcessor>(new GrTextureDomainEffect(*this)); |
| } |
| |
| SkString dumpInfo() const override { |
| SkString str; |
| str.appendf("Domain: [L: %.2f, T: %.2f, R: %.2f, B: %.2f]", |
| fTextureDomain.domain().fLeft, fTextureDomain.domain().fTop, |
| fTextureDomain.domain().fRight, fTextureDomain.domain().fBottom); |
| str.append(INHERITED::dumpInfo()); |
| return str; |
| } |
| |
| private: |
| GrCoordTransform fCoordTransform; |
| GrTextureDomain fTextureDomain; |
| TextureSampler fTextureSampler; |
| |
| GrTextureDomainEffect(sk_sp<GrTextureProxy>, |
| const SkMatrix&, |
| const SkRect& domain, |
| GrTextureDomain::Mode, |
| GrSamplerState::Filter); |
| |
| explicit GrTextureDomainEffect(const GrTextureDomainEffect&); |
| |
| static OptimizationFlags OptFlags(GrPixelConfig config, GrTextureDomain::Mode mode); |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| typedef GrFragmentProcessor INHERITED; |
| }; |
| |
| class GrDeviceSpaceTextureDecalFragmentProcessor : public GrFragmentProcessor { |
| public: |
| static std::unique_ptr<GrFragmentProcessor> Make(sk_sp<GrTextureProxy>, |
| const SkIRect& subset, |
| const SkIPoint& deviceSpaceOffset); |
| |
| const char* name() const override { return "GrDeviceSpaceTextureDecalFragmentProcessor"; } |
| |
| SkString dumpInfo() const override { |
| SkString str; |
| str.appendf("Domain: [L: %.2f, T: %.2f, R: %.2f, B: %.2f] Offset: [%d %d]", |
| fTextureDomain.domain().fLeft, fTextureDomain.domain().fTop, |
| fTextureDomain.domain().fRight, fTextureDomain.domain().fBottom, |
| fDeviceSpaceOffset.fX, fDeviceSpaceOffset.fY); |
| str.append(INHERITED::dumpInfo()); |
| return str; |
| } |
| |
| std::unique_ptr<GrFragmentProcessor> clone() const override; |
| |
| private: |
| TextureSampler fTextureSampler; |
| GrTextureDomain fTextureDomain; |
| SkIPoint fDeviceSpaceOffset; |
| |
| GrDeviceSpaceTextureDecalFragmentProcessor(sk_sp<GrTextureProxy>, |
| const SkIRect&, const SkIPoint&); |
| GrDeviceSpaceTextureDecalFragmentProcessor(const GrDeviceSpaceTextureDecalFragmentProcessor&); |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| // Since we always use decal mode, there is no need for key data. |
| void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override {} |
| |
| bool onIsEqual(const GrFragmentProcessor& fp) const override; |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
| |
| typedef GrFragmentProcessor INHERITED; |
| }; |
| #endif |