commit-bot@chromium.org | 907fbd5 | 2013-12-09 17:03:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef GrTextureDomainEffect_DEFINED |
| 9 | #define GrTextureDomainEffect_DEFINED |
| 10 | |
| 11 | #include "GrSingleTextureEffect.h" |
| 12 | #include "gl/GrGLEffect.h" |
| 13 | |
| 14 | class GrGLShaderBuilder; |
| 15 | struct SkRect; |
| 16 | |
| 17 | /** |
| 18 | * Limits a texture's lookup coordinates to a domain. Samples outside the domain are either clamped |
| 19 | * the edge of the domain or result in a vec4 of zeros (decal mode). The domain is clipped to |
| 20 | * normalized texture coords ([0,1]x[0,1] square). Bilinear filtering can cause texels outside the |
| 21 | * domain to affect the read value unless the caller considers this when calculating the domain. |
| 22 | */ |
| 23 | class GrTextureDomain { |
| 24 | public: |
| 25 | enum Mode { |
| 26 | kIgnore_Mode, // Ignore the texture domain rectangle. |
| 27 | kClamp_Mode, // Clamp texture coords to the domain rectangle. |
| 28 | kDecal_Mode, // Treat the area outside the domain rectangle as fully transparent. |
| 29 | |
| 30 | kLastMode = kDecal_Mode |
| 31 | }; |
| 32 | static const int kModeCount = kLastMode + 1; |
| 33 | |
commit-bot@chromium.org | 7d7f314 | 2013-12-16 15:18:11 +0000 | [diff] [blame] | 34 | static const GrTextureDomain& IgnoredDomain() { |
| 35 | static const SkRect gDummyRect = {0, 0, 0, 0}; |
| 36 | static const GrTextureDomain gDomain(gDummyRect, kIgnore_Mode); |
| 37 | return gDomain; |
| 38 | } |
| 39 | |
commit-bot@chromium.org | 907fbd5 | 2013-12-09 17:03:02 +0000 | [diff] [blame] | 40 | /** |
| 41 | * @param index Pass a value >= 0 if using multiple texture domains in the same effect. |
| 42 | * It is used to keep inserted variables from causing name collisions. |
| 43 | */ |
| 44 | GrTextureDomain(const SkRect& domain, Mode, int index = -1); |
| 45 | |
| 46 | const SkRect& domain() const { return fDomain; } |
| 47 | Mode mode() const { return fMode; } |
| 48 | |
| 49 | /* Computes a domain that bounds all the texels in texelRect. Note that with bilerp enabled |
| 50 | texels neighboring the domain may be read. */ |
| 51 | static const SkRect MakeTexelDomain(const GrTexture* texture, const SkIRect& texelRect) { |
| 52 | SkScalar wInv = SK_Scalar1 / texture->width(); |
| 53 | SkScalar hInv = SK_Scalar1 / texture->height(); |
| 54 | SkRect result = { |
| 55 | texelRect.fLeft * wInv, |
| 56 | texelRect.fTop * hInv, |
| 57 | texelRect.fRight * wInv, |
| 58 | texelRect.fBottom * hInv |
| 59 | }; |
| 60 | return result; |
| 61 | } |
| 62 | |
| 63 | bool operator== (const GrTextureDomain& that) const { |
| 64 | return fMode == that.fMode && fDomain == that.fDomain; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * A GrGLEffect subclass that corresponds to a GrEffect subclass that uses GrTextureDomain |
| 69 | * should include this helper. It generates the texture domain GLSL, produces the part of the |
| 70 | * effect key that reflects the texture domain code, and performs the uniform uploads necessary |
| 71 | * for texture domains. |
| 72 | */ |
| 73 | class GLDomain { |
| 74 | public: |
| 75 | GLDomain() { |
| 76 | fPrevDomain[0] = SK_FloatNaN; |
| 77 | SkDEBUGCODE(fMode = (Mode) -1;) |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Call this from GrGLEffect::emitCode() to sample the texture W.R.T. the domain and mode. |
| 82 | * |
| 83 | * @param outcolor name of vec4 variable to hold the sampled color. |
| 84 | * @param inCoords name of vec2 variable containing the coords to be used with the domain. |
| 85 | * It is assumed that this is a variable and not an expression. |
| 86 | * @param inModulateColor if non-NULL the sampled color will be modulated with this |
| 87 | * expression before being written to outColor. |
| 88 | */ |
| 89 | void sampleTexture(GrGLShaderBuilder* builder, |
| 90 | const GrTextureDomain& textureDomain, |
| 91 | const char* outColor, |
| 92 | const SkString& inCoords, |
| 93 | const GrGLEffect::TextureSampler sampler, |
| 94 | const char* inModulateColor = NULL); |
| 95 | |
| 96 | /** |
| 97 | * Call this from GrGLEffect::setData() to upload uniforms necessary for the texture domain. |
| 98 | * The rectangle is automatically adjusted to account for the texture's origin. |
| 99 | */ |
| 100 | void setData(const GrGLUniformManager& uman, const GrTextureDomain& textureDomain, |
| 101 | GrSurfaceOrigin textureOrigin); |
| 102 | |
| 103 | enum { |
| 104 | kDomainKeyBits = 2, // See DomainKey(). |
| 105 | }; |
| 106 | |
| 107 | /** |
| 108 | * GrGLEffect::GenKey() must call this and include the returned value in it's computed key. |
| 109 | * The returned will be limited to the lower kDomainKeyBits bits. |
| 110 | */ |
bsalomon | 63e99f7 | 2014-07-21 08:03:14 -0700 | [diff] [blame^] | 111 | static uint32_t DomainKey(const GrTextureDomain& domain) { |
commit-bot@chromium.org | 907fbd5 | 2013-12-09 17:03:02 +0000 | [diff] [blame] | 112 | GR_STATIC_ASSERT(kModeCount <= 4); |
| 113 | return domain.mode(); |
| 114 | } |
| 115 | |
| 116 | private: |
| 117 | SkDEBUGCODE(Mode fMode;) |
| 118 | GrGLUniformManager::UniformHandle fDomainUni; |
| 119 | SkString fDomainName; |
| 120 | GrGLfloat fPrevDomain[4]; |
| 121 | }; |
| 122 | |
| 123 | protected: |
| 124 | Mode fMode; |
| 125 | SkRect fDomain; |
| 126 | int fIndex; |
| 127 | |
| 128 | typedef GrSingleTextureEffect INHERITED; |
| 129 | }; |
| 130 | |
| 131 | class GrGLTextureDomainEffect; |
| 132 | |
| 133 | /** |
| 134 | * A basic texture effect that uses GrTextureDomain. |
| 135 | */ |
| 136 | class GrTextureDomainEffect : public GrSingleTextureEffect { |
| 137 | |
| 138 | public: |
bsalomon | 83d081a | 2014-07-08 09:56:10 -0700 | [diff] [blame] | 139 | static GrEffect* Create(GrTexture*, |
| 140 | const SkMatrix&, |
| 141 | const SkRect& domain, |
| 142 | GrTextureDomain::Mode, |
| 143 | GrTextureParams::FilterMode filterMode, |
| 144 | GrCoordSet = kLocal_GrCoordSet); |
commit-bot@chromium.org | 907fbd5 | 2013-12-09 17:03:02 +0000 | [diff] [blame] | 145 | |
| 146 | virtual ~GrTextureDomainEffect(); |
| 147 | |
| 148 | static const char* Name() { return "TextureDomain"; } |
| 149 | |
| 150 | typedef GrGLTextureDomainEffect GLEffect; |
| 151 | |
| 152 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 153 | virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| 154 | |
| 155 | const GrTextureDomain& textureDomain() const { return fTextureDomain; } |
| 156 | |
| 157 | protected: |
| 158 | GrTextureDomain fTextureDomain; |
| 159 | |
| 160 | private: |
| 161 | GrTextureDomainEffect(GrTexture*, |
| 162 | const SkMatrix&, |
| 163 | const SkRect& domain, |
| 164 | GrTextureDomain::Mode, |
| 165 | GrTextureParams::FilterMode, |
| 166 | GrCoordSet); |
| 167 | |
| 168 | virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; |
| 169 | |
| 170 | GR_DECLARE_EFFECT_TEST; |
| 171 | |
| 172 | typedef GrSingleTextureEffect INHERITED; |
| 173 | }; |
| 174 | |
| 175 | #endif |