commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1 | |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright 2014 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 8 | |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 9 | #include "SkTwoPointConicalGradient_gpu.h" |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 10 | |
| 11 | #include "SkTwoPointConicalGradient.h" |
| 12 | |
commit-bot@chromium.org | ef93d29 | 2014-04-10 15:37:52 +0000 | [diff] [blame] | 13 | #if SK_SUPPORT_GPU |
commit-bot@chromium.org | 7f43493 | 2014-04-10 16:03:06 +0000 | [diff] [blame] | 14 | #include "GrTBackendEffectFactory.h" |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 15 | // For brevity |
| 16 | typedef GrGLUniformManager::UniformHandle UniformHandle; |
| 17 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 18 | static const SkScalar kErrorTol = 0.00001f; |
egdaniel | 8405ef9 | 2014-06-09 11:57:28 -0700 | [diff] [blame^] | 19 | static const SkScalar kEdgeErrorTol = 5.f * kErrorTol; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 20 | |
| 21 | /** |
| 22 | * We have three general cases for 2pt conical gradients. First we always assume that |
| 23 | * the start radius <= end radius. Our first case (kInside_) is when the start circle |
| 24 | * is completely enclosed by the end circle. The second case (kOutside_) is the case |
| 25 | * when the start circle is either completely outside the end circle or the circles |
| 26 | * overlap. The final case (kEdge_) is when the start circle is inside the end one, |
| 27 | * but the two are just barely touching at 1 point along their edges. |
| 28 | */ |
| 29 | enum ConicalType { |
| 30 | kInside_ConicalType, |
| 31 | kOutside_ConicalType, |
| 32 | kEdge_ConicalType, |
| 33 | }; |
| 34 | |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 35 | ////////////////////////////////////////////////////////////////////////////// |
| 36 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 37 | static void set_matrix_edge_conical(const SkTwoPointConicalGradient& shader, |
| 38 | SkMatrix* invLMatrix) { |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 39 | // Inverse of the current local matrix is passed in then, |
| 40 | // translate to center1, rotate so center2 is on x axis. |
| 41 | const SkPoint& center1 = shader.getStartCenter(); |
| 42 | const SkPoint& center2 = shader.getEndCenter(); |
| 43 | |
| 44 | invLMatrix->postTranslate(-center1.fX, -center1.fY); |
| 45 | |
| 46 | SkPoint diff = center2 - center1; |
| 47 | SkScalar diffLen = diff.length(); |
| 48 | if (0 != diffLen) { |
| 49 | SkScalar invDiffLen = SkScalarInvert(diffLen); |
| 50 | SkMatrix rot; |
| 51 | rot.setSinCos(-SkScalarMul(invDiffLen, diff.fY), |
| 52 | SkScalarMul(invDiffLen, diff.fX)); |
| 53 | invLMatrix->postConcat(rot); |
| 54 | } |
| 55 | } |
| 56 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 57 | class GLEdge2PtConicalEffect; |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 58 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 59 | class Edge2PtConicalEffect : public GrGradientEffect { |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 60 | public: |
| 61 | |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 62 | static GrEffectRef* Create(GrContext* ctx, |
| 63 | const SkTwoPointConicalGradient& shader, |
| 64 | const SkMatrix& matrix, |
| 65 | SkShader::TileMode tm) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 66 | AutoEffectUnref effect(SkNEW_ARGS(Edge2PtConicalEffect, (ctx, shader, matrix, tm))); |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 67 | return CreateEffectRef(effect); |
| 68 | } |
| 69 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 70 | virtual ~Edge2PtConicalEffect() {} |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 71 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 72 | static const char* Name() { return "Two-Point Conical Gradient Edge Touching"; } |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 73 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 74 | |
| 75 | // The radial gradient parameters can collapse to a linear (instead of quadratic) equation. |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 76 | SkScalar center() const { return fCenterX1; } |
| 77 | SkScalar diffRadius() const { return fDiffRadius; } |
| 78 | SkScalar radius() const { return fRadius0; } |
| 79 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 80 | typedef GLEdge2PtConicalEffect GLEffect; |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 81 | |
| 82 | private: |
| 83 | virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 84 | const Edge2PtConicalEffect& s = CastEffect<Edge2PtConicalEffect>(sBase); |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 85 | return (INHERITED::onIsEqual(sBase) && |
| 86 | this->fCenterX1 == s.fCenterX1 && |
| 87 | this->fRadius0 == s.fRadius0 && |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 88 | this->fDiffRadius == s.fDiffRadius); |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 89 | } |
| 90 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 91 | Edge2PtConicalEffect(GrContext* ctx, |
| 92 | const SkTwoPointConicalGradient& shader, |
| 93 | const SkMatrix& matrix, |
| 94 | SkShader::TileMode tm) |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 95 | : INHERITED(ctx, shader, matrix, tm), |
| 96 | fCenterX1(shader.getCenterX1()), |
| 97 | fRadius0(shader.getStartRadius()), |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 98 | fDiffRadius(shader.getDiffRadius()){ |
| 99 | // We should only be calling this shader if we are degenerate case with touching circles |
egdaniel | 8405ef9 | 2014-06-09 11:57:28 -0700 | [diff] [blame^] | 100 | // When deciding if we are in edge case, we scaled by the end radius for cases when the |
| 101 | // start radius was close to zero, otherwise we scaled by the start radius |
| 102 | SkASSERT(SkScalarAbs(SkScalarAbs(fDiffRadius) - SkScalarAbs(fCenterX1)) < |
| 103 | kEdgeErrorTol * (fRadius0 < kErrorTol ? shader.getEndRadius() : fRadius0)); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 104 | |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 105 | // We pass the linear part of the quadratic as a varying. |
| 106 | // float b = -2.0 * (fCenterX1 * x + fRadius0 * fDiffRadius * z) |
| 107 | fBTransform = this->getCoordTransform(); |
| 108 | SkMatrix& bMatrix = *fBTransform.accessMatrix(); |
| 109 | SkScalar r0dr = SkScalarMul(fRadius0, fDiffRadius); |
| 110 | bMatrix[SkMatrix::kMScaleX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMScaleX]) + |
| 111 | SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp0])); |
| 112 | bMatrix[SkMatrix::kMSkewX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMSkewX]) + |
| 113 | SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp1])); |
| 114 | bMatrix[SkMatrix::kMTransX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMTransX]) + |
| 115 | SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp2])); |
| 116 | this->addCoordTransform(&fBTransform); |
| 117 | } |
| 118 | |
| 119 | GR_DECLARE_EFFECT_TEST; |
| 120 | |
| 121 | // @{ |
| 122 | // Cache of values - these can change arbitrarily, EXCEPT |
| 123 | // we shouldn't change between degenerate and non-degenerate?! |
| 124 | |
| 125 | GrCoordTransform fBTransform; |
| 126 | SkScalar fCenterX1; |
| 127 | SkScalar fRadius0; |
| 128 | SkScalar fDiffRadius; |
| 129 | |
| 130 | // @} |
| 131 | |
| 132 | typedef GrGradientEffect INHERITED; |
| 133 | }; |
| 134 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 135 | class GLEdge2PtConicalEffect : public GrGLGradientEffect { |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 136 | public: |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 137 | GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); |
| 138 | virtual ~GLEdge2PtConicalEffect() { } |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 139 | |
| 140 | virtual void emitCode(GrGLShaderBuilder*, |
| 141 | const GrDrawEffect&, |
| 142 | EffectKey, |
| 143 | const char* outputColor, |
| 144 | const char* inputColor, |
| 145 | const TransformedCoordsArray&, |
| 146 | const TextureSamplerArray&) SK_OVERRIDE; |
| 147 | virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| 148 | |
| 149 | static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); |
| 150 | |
| 151 | protected: |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 152 | UniformHandle fParamUni; |
| 153 | |
| 154 | const char* fVSVaryingName; |
| 155 | const char* fFSVaryingName; |
| 156 | |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 157 | // @{ |
| 158 | /// Values last uploaded as uniforms |
| 159 | |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 160 | SkScalar fCachedRadius; |
| 161 | SkScalar fCachedDiffRadius; |
| 162 | |
| 163 | // @} |
| 164 | |
| 165 | private: |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 166 | typedef GrGLGradientEffect INHERITED; |
| 167 | |
| 168 | }; |
| 169 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 170 | const GrBackendEffectFactory& Edge2PtConicalEffect::getFactory() const { |
| 171 | return GrTBackendEffectFactory<Edge2PtConicalEffect>::getInstance(); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 172 | } |
skia.committer@gmail.com | 221b911 | 2014-04-04 03:04:32 +0000 | [diff] [blame] | 173 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 174 | GR_DEFINE_EFFECT_TEST(Edge2PtConicalEffect); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 175 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 176 | GrEffectRef* Edge2PtConicalEffect::TestCreate(SkRandom* random, |
| 177 | GrContext* context, |
| 178 | const GrDrawTargetCaps&, |
| 179 | GrTexture**) { |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 180 | SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
| 181 | SkScalar radius1 = random->nextUScalar1(); |
| 182 | SkPoint center2; |
| 183 | SkScalar radius2; |
| 184 | do { |
| 185 | center2.set(random->nextUScalar1(), random->nextUScalar1()); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 186 | // If the circles are identical the factory will give us an empty shader. |
| 187 | // This will happen if we pick identical centers |
| 188 | } while (center1 == center2); |
| 189 | |
| 190 | // Below makes sure that circle one is contained within circle two |
| 191 | // and both circles are touching on an edge |
| 192 | SkPoint diff = center2 - center1; |
| 193 | SkScalar diffLen = diff.length(); |
| 194 | radius2 = radius1 + diffLen; |
| 195 | |
| 196 | SkColor colors[kMaxRandomGradientColors]; |
| 197 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 198 | SkScalar* stops = stopsArray; |
| 199 | SkShader::TileMode tm; |
| 200 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 201 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| 202 | center2, radius2, |
| 203 | colors, stops, colorCount, |
| 204 | tm)); |
| 205 | SkPaint paint; |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 206 | return shader->asNewEffect(context, paint, NULL); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | GLEdge2PtConicalEffect::GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, |
| 210 | const GrDrawEffect& drawEffect) |
| 211 | : INHERITED(factory) |
| 212 | , fVSVaryingName(NULL) |
| 213 | , fFSVaryingName(NULL) |
| 214 | , fCachedRadius(-SK_ScalarMax) |
| 215 | , fCachedDiffRadius(-SK_ScalarMax) {} |
| 216 | |
| 217 | void GLEdge2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, |
| 218 | const GrDrawEffect&, |
| 219 | EffectKey key, |
| 220 | const char* outputColor, |
| 221 | const char* inputColor, |
| 222 | const TransformedCoordsArray& coords, |
| 223 | const TextureSamplerArray& samplers) { |
| 224 | this->emitUniforms(builder, key); |
| 225 | fParamUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility, |
| 226 | kFloat_GrSLType, "Conical2FSParams", 3); |
| 227 | |
| 228 | SkString cName("c"); |
| 229 | SkString tName("t"); |
| 230 | SkString p0; // start radius |
| 231 | SkString p1; // start radius squared |
| 232 | SkString p2; // difference in radii (r1 - r0) |
| 233 | |
| 234 | builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); |
| 235 | builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); |
| 236 | builder->getUniformVariable(fParamUni).appendArrayAccess(2, &p2); |
| 237 | |
| 238 | // We interpolate the linear component in coords[1]. |
| 239 | SkASSERT(coords[0].type() == coords[1].type()); |
| 240 | const char* coords2D; |
| 241 | SkString bVar; |
| 242 | if (kVec3f_GrSLType == coords[0].type()) { |
| 243 | builder->fsCodeAppendf("\tvec3 interpolants = vec3(%s.xy / %s.z, %s.x / %s.z);\n", |
| 244 | coords[0].c_str(), coords[0].c_str(), coords[1].c_str(), coords[1].c_str()); |
| 245 | coords2D = "interpolants.xy"; |
| 246 | bVar = "interpolants.z"; |
| 247 | } else { |
| 248 | coords2D = coords[0].c_str(); |
| 249 | bVar.printf("%s.x", coords[1].c_str()); |
| 250 | } |
| 251 | |
| 252 | // output will default to transparent black (we simply won't write anything |
| 253 | // else to it if invalid, instead of discarding or returning prematurely) |
| 254 | builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| 255 | |
| 256 | // c = (x^2)+(y^2) - params[1] |
| 257 | builder->fsCodeAppendf("\tfloat %s = dot(%s, %s) - %s;\n", |
| 258 | cName.c_str(), coords2D, coords2D, p1.c_str()); |
| 259 | |
| 260 | // linear case: t = -c/b |
| 261 | builder->fsCodeAppendf("\tfloat %s = -(%s / %s);\n", tName.c_str(), |
| 262 | cName.c_str(), bVar.c_str()); |
| 263 | |
| 264 | // if r(t) > 0, then t will be the x coordinate |
| 265 | builder->fsCodeAppendf("\tif (%s * %s + %s > 0.0) {\n", tName.c_str(), |
| 266 | p2.c_str(), p0.c_str()); |
| 267 | builder->fsCodeAppend("\t"); |
| 268 | this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); |
| 269 | builder->fsCodeAppend("\t}\n"); |
| 270 | } |
| 271 | |
| 272 | void GLEdge2PtConicalEffect::setData(const GrGLUniformManager& uman, |
| 273 | const GrDrawEffect& drawEffect) { |
| 274 | INHERITED::setData(uman, drawEffect); |
| 275 | const Edge2PtConicalEffect& data = drawEffect.castEffect<Edge2PtConicalEffect>(); |
| 276 | SkScalar radius0 = data.radius(); |
| 277 | SkScalar diffRadius = data.diffRadius(); |
| 278 | |
| 279 | if (fCachedRadius != radius0 || |
| 280 | fCachedDiffRadius != diffRadius) { |
| 281 | |
| 282 | float values[3] = { |
| 283 | SkScalarToFloat(radius0), |
| 284 | SkScalarToFloat(SkScalarMul(radius0, radius0)), |
| 285 | SkScalarToFloat(diffRadius) |
| 286 | }; |
| 287 | |
| 288 | uman.set1fv(fParamUni, 3, values); |
| 289 | fCachedRadius = radius0; |
| 290 | fCachedDiffRadius = diffRadius; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | GrGLEffect::EffectKey GLEdge2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, |
| 295 | const GrGLCaps&) { |
| 296 | return GenBaseGradientKey(drawEffect); |
| 297 | } |
| 298 | |
| 299 | ////////////////////////////////////////////////////////////////////////////// |
| 300 | // Focal Conical Gradients |
| 301 | ////////////////////////////////////////////////////////////////////////////// |
| 302 | |
| 303 | static ConicalType set_matrix_focal_conical(const SkTwoPointConicalGradient& shader, |
| 304 | SkMatrix* invLMatrix, SkScalar* focalX) { |
| 305 | // Inverse of the current local matrix is passed in then, |
| 306 | // translate, scale, and rotate such that endCircle is unit circle on x-axis, |
| 307 | // and focal point is at the origin. |
| 308 | ConicalType conicalType; |
| 309 | const SkPoint& focal = shader.getStartCenter(); |
| 310 | const SkPoint& centerEnd = shader.getEndCenter(); |
| 311 | SkScalar radius = shader.getEndRadius(); |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 312 | SkScalar invRadius = 1.f / radius; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 313 | |
| 314 | SkMatrix matrix; |
| 315 | |
| 316 | matrix.setTranslate(-centerEnd.fX, -centerEnd.fY); |
| 317 | matrix.postScale(invRadius, invRadius); |
| 318 | |
| 319 | SkPoint focalTrans; |
| 320 | matrix.mapPoints(&focalTrans, &focal, 1); |
| 321 | *focalX = focalTrans.length(); |
| 322 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 323 | if (0.f != *focalX) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 324 | SkScalar invFocalX = SkScalarInvert(*focalX); |
| 325 | SkMatrix rot; |
| 326 | rot.setSinCos(-SkScalarMul(invFocalX, focalTrans.fY), |
| 327 | SkScalarMul(invFocalX, focalTrans.fX)); |
| 328 | matrix.postConcat(rot); |
| 329 | } |
| 330 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 331 | matrix.postTranslate(-(*focalX), 0.f); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 332 | |
| 333 | // If the focal point is touching the edge of the circle it will |
| 334 | // cause a degenerate case that must be handled separately |
egdaniel | 8405ef9 | 2014-06-09 11:57:28 -0700 | [diff] [blame^] | 335 | // kEdgeErrorTol = 5 * kErrorTol was picked after manual testing the |
| 336 | // stability trade off versus the linear approx used in the Edge Shader |
| 337 | if (SkScalarAbs(1.f - (*focalX)) < kEdgeErrorTol) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 338 | return kEdge_ConicalType; |
| 339 | } |
| 340 | |
| 341 | // Scale factor 1 / (1 - focalX * focalX) |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 342 | SkScalar oneMinusF2 = 1.f - SkScalarMul(*focalX, *focalX); |
| 343 | SkScalar s = SkScalarDiv(1.f, oneMinusF2); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 344 | |
| 345 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 346 | if (s >= 0.f) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 347 | conicalType = kInside_ConicalType; |
| 348 | matrix.postScale(s, s * SkScalarSqrt(oneMinusF2)); |
| 349 | } else { |
| 350 | conicalType = kOutside_ConicalType; |
| 351 | matrix.postScale(s, s); |
| 352 | } |
| 353 | |
| 354 | invLMatrix->postConcat(matrix); |
| 355 | |
| 356 | return conicalType; |
| 357 | } |
| 358 | |
| 359 | ////////////////////////////////////////////////////////////////////////////// |
| 360 | |
| 361 | class GLFocalOutside2PtConicalEffect; |
| 362 | |
| 363 | class FocalOutside2PtConicalEffect : public GrGradientEffect { |
| 364 | public: |
| 365 | |
| 366 | static GrEffectRef* Create(GrContext* ctx, |
| 367 | const SkTwoPointConicalGradient& shader, |
| 368 | const SkMatrix& matrix, |
| 369 | SkShader::TileMode tm, |
| 370 | SkScalar focalX) { |
| 371 | AutoEffectUnref effect(SkNEW_ARGS(FocalOutside2PtConicalEffect, (ctx, shader, matrix, tm, focalX))); |
| 372 | return CreateEffectRef(effect); |
| 373 | } |
| 374 | |
| 375 | virtual ~FocalOutside2PtConicalEffect() { } |
| 376 | |
| 377 | static const char* Name() { return "Two-Point Conical Gradient Focal Outside"; } |
| 378 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 379 | |
| 380 | bool isFlipped() const { return fIsFlipped; } |
| 381 | SkScalar focal() const { return fFocalX; } |
| 382 | |
| 383 | typedef GLFocalOutside2PtConicalEffect GLEffect; |
| 384 | |
| 385 | private: |
| 386 | virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| 387 | const FocalOutside2PtConicalEffect& s = CastEffect<FocalOutside2PtConicalEffect>(sBase); |
| 388 | return (INHERITED::onIsEqual(sBase) && |
| 389 | this->fFocalX == s.fFocalX && |
| 390 | this->fIsFlipped == s.fIsFlipped); |
| 391 | } |
| 392 | |
| 393 | FocalOutside2PtConicalEffect(GrContext* ctx, |
| 394 | const SkTwoPointConicalGradient& shader, |
| 395 | const SkMatrix& matrix, |
| 396 | SkShader::TileMode tm, |
| 397 | SkScalar focalX) |
| 398 | : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX), fIsFlipped(shader.isFlippedGrad()) {} |
| 399 | |
| 400 | GR_DECLARE_EFFECT_TEST; |
| 401 | |
| 402 | SkScalar fFocalX; |
| 403 | bool fIsFlipped; |
| 404 | |
| 405 | typedef GrGradientEffect INHERITED; |
| 406 | }; |
| 407 | |
| 408 | class GLFocalOutside2PtConicalEffect : public GrGLGradientEffect { |
| 409 | public: |
| 410 | GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); |
| 411 | virtual ~GLFocalOutside2PtConicalEffect() { } |
| 412 | |
| 413 | virtual void emitCode(GrGLShaderBuilder*, |
| 414 | const GrDrawEffect&, |
| 415 | EffectKey, |
| 416 | const char* outputColor, |
| 417 | const char* inputColor, |
| 418 | const TransformedCoordsArray&, |
| 419 | const TextureSamplerArray&) SK_OVERRIDE; |
| 420 | virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| 421 | |
| 422 | static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); |
| 423 | |
| 424 | protected: |
| 425 | UniformHandle fParamUni; |
| 426 | |
| 427 | const char* fVSVaryingName; |
| 428 | const char* fFSVaryingName; |
| 429 | |
| 430 | bool fIsFlipped; |
| 431 | |
| 432 | // @{ |
| 433 | /// Values last uploaded as uniforms |
| 434 | |
| 435 | SkScalar fCachedFocal; |
| 436 | |
| 437 | // @} |
| 438 | |
| 439 | private: |
| 440 | typedef GrGLGradientEffect INHERITED; |
| 441 | |
| 442 | }; |
| 443 | |
| 444 | const GrBackendEffectFactory& FocalOutside2PtConicalEffect::getFactory() const { |
| 445 | return GrTBackendEffectFactory<FocalOutside2PtConicalEffect>::getInstance(); |
| 446 | } |
| 447 | |
| 448 | GR_DEFINE_EFFECT_TEST(FocalOutside2PtConicalEffect); |
| 449 | |
| 450 | GrEffectRef* FocalOutside2PtConicalEffect::TestCreate(SkRandom* random, |
| 451 | GrContext* context, |
| 452 | const GrDrawTargetCaps&, |
| 453 | GrTexture**) { |
| 454 | SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 455 | SkScalar radius1 = 0.f; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 456 | SkPoint center2; |
| 457 | SkScalar radius2; |
| 458 | do { |
| 459 | center2.set(random->nextUScalar1(), random->nextUScalar1()); |
skia.committer@gmail.com | ede0c5c | 2014-04-23 03:04:11 +0000 | [diff] [blame] | 460 | // Need to make sure the centers are not the same or else focal point will be inside |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 461 | } while (center1 == center2); |
| 462 | SkPoint diff = center2 - center1; |
| 463 | SkScalar diffLen = diff.length(); |
| 464 | // Below makes sure that the focal point is not contained within circle two |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 465 | radius2 = random->nextRangeF(0.f, diffLen); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 466 | |
| 467 | SkColor colors[kMaxRandomGradientColors]; |
| 468 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 469 | SkScalar* stops = stopsArray; |
| 470 | SkShader::TileMode tm; |
| 471 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 472 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| 473 | center2, radius2, |
| 474 | colors, stops, colorCount, |
| 475 | tm)); |
| 476 | SkPaint paint; |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 477 | return shader->asNewEffect(context, paint, NULL); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | GLFocalOutside2PtConicalEffect::GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| 481 | const GrDrawEffect& drawEffect) |
| 482 | : INHERITED(factory) |
| 483 | , fVSVaryingName(NULL) |
| 484 | , fFSVaryingName(NULL) |
| 485 | , fCachedFocal(SK_ScalarMax) { |
| 486 | const FocalOutside2PtConicalEffect& data = drawEffect.castEffect<FocalOutside2PtConicalEffect>(); |
| 487 | fIsFlipped = data.isFlipped(); |
| 488 | } |
| 489 | |
| 490 | void GLFocalOutside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, |
| 491 | const GrDrawEffect&, |
| 492 | EffectKey key, |
| 493 | const char* outputColor, |
| 494 | const char* inputColor, |
| 495 | const TransformedCoordsArray& coords, |
| 496 | const TextureSamplerArray& samplers) { |
| 497 | this->emitUniforms(builder, key); |
| 498 | fParamUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility, |
| 499 | kFloat_GrSLType, "Conical2FSParams", 2); |
| 500 | SkString tName("t"); |
| 501 | SkString p0; // focalX |
| 502 | SkString p1; // 1 - focalX * focalX |
| 503 | |
| 504 | builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); |
| 505 | builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); |
| 506 | |
| 507 | // if we have a vec3 from being in perspective, convert it to a vec2 first |
skia.committer@gmail.com | ede0c5c | 2014-04-23 03:04:11 +0000 | [diff] [blame] | 508 | SkString coords2DString = builder->ensureFSCoords2D(coords, 0); |
| 509 | const char* coords2D = coords2DString.c_str(); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 510 | |
| 511 | // t = p.x * focal.x +/- sqrt(p.x^2 + (1 - focal.x^2) * p.y^2) |
| 512 | |
| 513 | // output will default to transparent black (we simply won't write anything |
| 514 | // else to it if invalid, instead of discarding or returning prematurely) |
| 515 | builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| 516 | |
| 517 | builder->fsCodeAppendf("\tfloat xs = %s.x * %s.x;\n", coords2D, coords2D); |
| 518 | builder->fsCodeAppendf("\tfloat ys = %s.y * %s.y;\n", coords2D, coords2D); |
| 519 | builder->fsCodeAppendf("\tfloat d = xs + %s * ys;\n", p1.c_str()); |
| 520 | |
| 521 | // Must check to see if we flipped the circle order (to make sure start radius < end radius) |
| 522 | // If so we must also flip sign on sqrt |
| 523 | if (!fIsFlipped) { |
| 524 | builder->fsCodeAppendf("\tfloat %s = %s.x * %s + sqrt(d);\n", tName.c_str(), |
| 525 | coords2D, p0.c_str()); |
| 526 | } else { |
| 527 | builder->fsCodeAppendf("\tfloat %s = %s.x * %s - sqrt(d);\n", tName.c_str(), |
| 528 | coords2D, p0.c_str()); |
| 529 | } |
| 530 | |
| 531 | builder->fsCodeAppendf("\tif (%s >= 0.0 && d >= 0.0) {\n", tName.c_str()); |
| 532 | builder->fsCodeAppend("\t\t"); |
| 533 | this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); |
| 534 | builder->fsCodeAppend("\t}\n"); |
| 535 | } |
| 536 | |
| 537 | void GLFocalOutside2PtConicalEffect::setData(const GrGLUniformManager& uman, |
| 538 | const GrDrawEffect& drawEffect) { |
| 539 | INHERITED::setData(uman, drawEffect); |
| 540 | const FocalOutside2PtConicalEffect& data = drawEffect.castEffect<FocalOutside2PtConicalEffect>(); |
| 541 | SkASSERT(data.isFlipped() == fIsFlipped); |
| 542 | SkScalar focal = data.focal(); |
| 543 | |
| 544 | if (fCachedFocal != focal) { |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 545 | SkScalar oneMinus2F = 1.f - SkScalarMul(focal, focal); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 546 | |
| 547 | float values[2] = { |
| 548 | SkScalarToFloat(focal), |
| 549 | SkScalarToFloat(oneMinus2F), |
| 550 | }; |
| 551 | |
| 552 | uman.set1fv(fParamUni, 2, values); |
| 553 | fCachedFocal = focal; |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | GrGLEffect::EffectKey GLFocalOutside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, |
| 558 | const GrGLCaps&) { |
| 559 | enum { |
| 560 | kIsFlipped = 1 << kBaseKeyBitCnt, |
| 561 | }; |
| 562 | |
| 563 | EffectKey key = GenBaseGradientKey(drawEffect); |
| 564 | |
| 565 | if (drawEffect.castEffect<FocalOutside2PtConicalEffect>().isFlipped()) { |
| 566 | key |= kIsFlipped; |
| 567 | } |
| 568 | return key; |
| 569 | } |
| 570 | |
| 571 | ////////////////////////////////////////////////////////////////////////////// |
| 572 | |
| 573 | class GLFocalInside2PtConicalEffect; |
| 574 | |
| 575 | class FocalInside2PtConicalEffect : public GrGradientEffect { |
| 576 | public: |
| 577 | |
| 578 | static GrEffectRef* Create(GrContext* ctx, |
| 579 | const SkTwoPointConicalGradient& shader, |
| 580 | const SkMatrix& matrix, |
| 581 | SkShader::TileMode tm, |
| 582 | SkScalar focalX) { |
| 583 | AutoEffectUnref effect(SkNEW_ARGS(FocalInside2PtConicalEffect, (ctx, shader, matrix, tm, focalX))); |
| 584 | return CreateEffectRef(effect); |
| 585 | } |
| 586 | |
| 587 | virtual ~FocalInside2PtConicalEffect() {} |
| 588 | |
| 589 | static const char* Name() { return "Two-Point Conical Gradient Focal Inside"; } |
| 590 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 591 | |
| 592 | SkScalar focal() const { return fFocalX; } |
| 593 | |
| 594 | typedef GLFocalInside2PtConicalEffect GLEffect; |
| 595 | |
| 596 | private: |
| 597 | virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| 598 | const FocalInside2PtConicalEffect& s = CastEffect<FocalInside2PtConicalEffect>(sBase); |
| 599 | return (INHERITED::onIsEqual(sBase) && |
| 600 | this->fFocalX == s.fFocalX); |
| 601 | } |
| 602 | |
| 603 | FocalInside2PtConicalEffect(GrContext* ctx, |
| 604 | const SkTwoPointConicalGradient& shader, |
| 605 | const SkMatrix& matrix, |
| 606 | SkShader::TileMode tm, |
| 607 | SkScalar focalX) |
| 608 | : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX) {} |
| 609 | |
| 610 | GR_DECLARE_EFFECT_TEST; |
| 611 | |
| 612 | SkScalar fFocalX; |
| 613 | |
| 614 | typedef GrGradientEffect INHERITED; |
| 615 | }; |
| 616 | |
| 617 | class GLFocalInside2PtConicalEffect : public GrGLGradientEffect { |
| 618 | public: |
| 619 | GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); |
| 620 | virtual ~GLFocalInside2PtConicalEffect() {} |
| 621 | |
| 622 | virtual void emitCode(GrGLShaderBuilder*, |
| 623 | const GrDrawEffect&, |
| 624 | EffectKey, |
| 625 | const char* outputColor, |
| 626 | const char* inputColor, |
| 627 | const TransformedCoordsArray&, |
| 628 | const TextureSamplerArray&) SK_OVERRIDE; |
| 629 | virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| 630 | |
| 631 | static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); |
| 632 | |
| 633 | protected: |
| 634 | UniformHandle fFocalUni; |
| 635 | |
| 636 | const char* fVSVaryingName; |
| 637 | const char* fFSVaryingName; |
| 638 | |
| 639 | // @{ |
| 640 | /// Values last uploaded as uniforms |
| 641 | |
| 642 | SkScalar fCachedFocal; |
| 643 | |
| 644 | // @} |
| 645 | |
| 646 | private: |
| 647 | typedef GrGLGradientEffect INHERITED; |
| 648 | |
| 649 | }; |
| 650 | |
| 651 | const GrBackendEffectFactory& FocalInside2PtConicalEffect::getFactory() const { |
| 652 | return GrTBackendEffectFactory<FocalInside2PtConicalEffect>::getInstance(); |
| 653 | } |
| 654 | |
| 655 | GR_DEFINE_EFFECT_TEST(FocalInside2PtConicalEffect); |
| 656 | |
| 657 | GrEffectRef* FocalInside2PtConicalEffect::TestCreate(SkRandom* random, |
| 658 | GrContext* context, |
| 659 | const GrDrawTargetCaps&, |
| 660 | GrTexture**) { |
| 661 | SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 662 | SkScalar radius1 = 0.f; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 663 | SkPoint center2; |
| 664 | SkScalar radius2; |
| 665 | do { |
| 666 | center2.set(random->nextUScalar1(), random->nextUScalar1()); |
| 667 | // Below makes sure radius2 is larger enouch such that the focal point |
| 668 | // is inside the end circle |
| 669 | SkScalar increase = random->nextUScalar1(); |
| 670 | SkPoint diff = center2 - center1; |
| 671 | SkScalar diffLen = diff.length(); |
| 672 | radius2 = diffLen + increase; |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 673 | // If the circles are identical the factory will give us an empty shader. |
| 674 | } while (radius1 == radius2 && center1 == center2); |
| 675 | |
| 676 | SkColor colors[kMaxRandomGradientColors]; |
| 677 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 678 | SkScalar* stops = stopsArray; |
| 679 | SkShader::TileMode tm; |
| 680 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 681 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| 682 | center2, radius2, |
| 683 | colors, stops, colorCount, |
| 684 | tm)); |
| 685 | SkPaint paint; |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 686 | return shader->asNewEffect(context, paint, NULL); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 687 | } |
| 688 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 689 | GLFocalInside2PtConicalEffect::GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| 690 | const GrDrawEffect& drawEffect) |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 691 | : INHERITED(factory) |
| 692 | , fVSVaryingName(NULL) |
| 693 | , fFSVaryingName(NULL) |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 694 | , fCachedFocal(SK_ScalarMax) {} |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 695 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 696 | void GLFocalInside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, |
| 697 | const GrDrawEffect&, |
| 698 | EffectKey key, |
| 699 | const char* outputColor, |
| 700 | const char* inputColor, |
| 701 | const TransformedCoordsArray& coords, |
| 702 | const TextureSamplerArray& samplers) { |
| 703 | this->emitUniforms(builder, key); |
| 704 | fFocalUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 705 | kFloat_GrSLType, "Conical2FSParams"); |
| 706 | SkString tName("t"); |
| 707 | |
| 708 | // this is the distance along x-axis from the end center to focal point in |
| 709 | // transformed coordinates |
| 710 | GrGLShaderVar focal = builder->getUniformVariable(fFocalUni); |
| 711 | |
| 712 | // if we have a vec3 from being in perspective, convert it to a vec2 first |
skia.committer@gmail.com | ede0c5c | 2014-04-23 03:04:11 +0000 | [diff] [blame] | 713 | SkString coords2DString = builder->ensureFSCoords2D(coords, 0); |
| 714 | const char* coords2D = coords2DString.c_str(); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 715 | |
| 716 | // t = p.x * focalX + length(p) |
| 717 | builder->fsCodeAppendf("\tfloat %s = %s.x * %s + length(%s);\n", tName.c_str(), |
| 718 | coords2D, focal.c_str(), coords2D); |
| 719 | |
| 720 | this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 721 | } |
| 722 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 723 | void GLFocalInside2PtConicalEffect::setData(const GrGLUniformManager& uman, |
| 724 | const GrDrawEffect& drawEffect) { |
| 725 | INHERITED::setData(uman, drawEffect); |
| 726 | const FocalInside2PtConicalEffect& data = drawEffect.castEffect<FocalInside2PtConicalEffect>(); |
| 727 | SkScalar focal = data.focal(); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 728 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 729 | if (fCachedFocal != focal) { |
| 730 | uman.set1f(fFocalUni, SkScalarToFloat(focal)); |
| 731 | fCachedFocal = focal; |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 732 | } |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | GrGLEffect::EffectKey GLFocalInside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, |
| 736 | const GrGLCaps&) { |
| 737 | return GenBaseGradientKey(drawEffect); |
| 738 | } |
| 739 | |
| 740 | ////////////////////////////////////////////////////////////////////////////// |
| 741 | // Circle Conical Gradients |
| 742 | ////////////////////////////////////////////////////////////////////////////// |
| 743 | |
| 744 | struct CircleConicalInfo { |
| 745 | SkPoint fCenterEnd; |
| 746 | SkScalar fA; |
| 747 | SkScalar fB; |
| 748 | SkScalar fC; |
| 749 | }; |
| 750 | |
| 751 | // Returns focal distance along x-axis in transformed coords |
| 752 | static ConicalType set_matrix_circle_conical(const SkTwoPointConicalGradient& shader, |
| 753 | SkMatrix* invLMatrix, CircleConicalInfo* info) { |
| 754 | // Inverse of the current local matrix is passed in then, |
| 755 | // translate and scale such that start circle is on the origin and has radius 1 |
| 756 | const SkPoint& centerStart = shader.getStartCenter(); |
| 757 | const SkPoint& centerEnd = shader.getEndCenter(); |
| 758 | SkScalar radiusStart = shader.getStartRadius(); |
| 759 | SkScalar radiusEnd = shader.getEndRadius(); |
| 760 | |
| 761 | SkMatrix matrix; |
| 762 | |
| 763 | matrix.setTranslate(-centerStart.fX, -centerStart.fY); |
| 764 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 765 | SkScalar invStartRad = 1.f / radiusStart; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 766 | matrix.postScale(invStartRad, invStartRad); |
| 767 | |
| 768 | radiusEnd /= radiusStart; |
| 769 | |
| 770 | SkPoint centerEndTrans; |
| 771 | matrix.mapPoints(¢erEndTrans, ¢erEnd, 1); |
| 772 | |
| 773 | SkScalar A = centerEndTrans.fX * centerEndTrans.fX + centerEndTrans.fY * centerEndTrans.fY |
| 774 | - radiusEnd * radiusEnd + 2 * radiusEnd - 1; |
| 775 | |
| 776 | // Check to see if start circle is inside end circle with edges touching. |
| 777 | // If touching we return that it is of kEdge_ConicalType, and leave the matrix setting |
egdaniel | 8405ef9 | 2014-06-09 11:57:28 -0700 | [diff] [blame^] | 778 | // to the edge shader. kEdgeErrorTol = 5 * kErrorTol was picked after manual testing |
| 779 | // so that C = 1 / A is stable, and the linear approximation used in the Edge shader is |
| 780 | // still accurate. |
| 781 | if (SkScalarAbs(A) < kEdgeErrorTol) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 782 | return kEdge_ConicalType; |
| 783 | } |
| 784 | |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 785 | SkScalar C = 1.f / A; |
| 786 | SkScalar B = (radiusEnd - 1.f) * C; |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 787 | |
| 788 | matrix.postScale(C, C); |
| 789 | |
| 790 | invLMatrix->postConcat(matrix); |
| 791 | |
| 792 | info->fCenterEnd = centerEndTrans; |
| 793 | info->fA = A; |
| 794 | info->fB = B; |
| 795 | info->fC = C; |
| 796 | |
| 797 | // if A ends up being negative, the start circle is contained completely inside the end cirlce |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 798 | if (A < 0.f) { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 799 | return kInside_ConicalType; |
| 800 | } |
| 801 | return kOutside_ConicalType; |
| 802 | } |
| 803 | |
| 804 | class GLCircleInside2PtConicalEffect; |
| 805 | |
| 806 | class CircleInside2PtConicalEffect : public GrGradientEffect { |
| 807 | public: |
| 808 | |
| 809 | static GrEffectRef* Create(GrContext* ctx, |
| 810 | const SkTwoPointConicalGradient& shader, |
| 811 | const SkMatrix& matrix, |
| 812 | SkShader::TileMode tm, |
| 813 | const CircleConicalInfo& info) { |
| 814 | AutoEffectUnref effect(SkNEW_ARGS(CircleInside2PtConicalEffect, (ctx, shader, matrix, tm, info))); |
| 815 | return CreateEffectRef(effect); |
| 816 | } |
| 817 | |
| 818 | virtual ~CircleInside2PtConicalEffect() {} |
| 819 | |
| 820 | static const char* Name() { return "Two-Point Conical Gradient Inside"; } |
| 821 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 822 | |
| 823 | SkScalar centerX() const { return fInfo.fCenterEnd.fX; } |
| 824 | SkScalar centerY() const { return fInfo.fCenterEnd.fY; } |
| 825 | SkScalar A() const { return fInfo.fA; } |
| 826 | SkScalar B() const { return fInfo.fB; } |
| 827 | SkScalar C() const { return fInfo.fC; } |
| 828 | |
| 829 | typedef GLCircleInside2PtConicalEffect GLEffect; |
| 830 | |
| 831 | private: |
| 832 | virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| 833 | const CircleInside2PtConicalEffect& s = CastEffect<CircleInside2PtConicalEffect>(sBase); |
| 834 | return (INHERITED::onIsEqual(sBase) && |
| 835 | this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && |
| 836 | this->fInfo.fA == s.fInfo.fA && |
| 837 | this->fInfo.fB == s.fInfo.fB && |
| 838 | this->fInfo.fC == s.fInfo.fC); |
| 839 | } |
| 840 | |
| 841 | CircleInside2PtConicalEffect(GrContext* ctx, |
| 842 | const SkTwoPointConicalGradient& shader, |
| 843 | const SkMatrix& matrix, |
| 844 | SkShader::TileMode tm, |
| 845 | const CircleConicalInfo& info) |
| 846 | : INHERITED(ctx, shader, matrix, tm), fInfo(info) {} |
| 847 | |
| 848 | GR_DECLARE_EFFECT_TEST; |
| 849 | |
| 850 | const CircleConicalInfo fInfo; |
| 851 | |
| 852 | typedef GrGradientEffect INHERITED; |
| 853 | }; |
| 854 | |
| 855 | class GLCircleInside2PtConicalEffect : public GrGLGradientEffect { |
| 856 | public: |
| 857 | GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); |
| 858 | virtual ~GLCircleInside2PtConicalEffect() {} |
| 859 | |
| 860 | virtual void emitCode(GrGLShaderBuilder*, |
| 861 | const GrDrawEffect&, |
| 862 | EffectKey, |
| 863 | const char* outputColor, |
| 864 | const char* inputColor, |
| 865 | const TransformedCoordsArray&, |
| 866 | const TextureSamplerArray&) SK_OVERRIDE; |
| 867 | virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| 868 | |
| 869 | static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); |
| 870 | |
| 871 | protected: |
| 872 | UniformHandle fCenterUni; |
| 873 | UniformHandle fParamUni; |
| 874 | |
| 875 | const char* fVSVaryingName; |
| 876 | const char* fFSVaryingName; |
| 877 | |
| 878 | // @{ |
| 879 | /// Values last uploaded as uniforms |
| 880 | |
| 881 | SkScalar fCachedCenterX; |
| 882 | SkScalar fCachedCenterY; |
| 883 | SkScalar fCachedA; |
| 884 | SkScalar fCachedB; |
| 885 | SkScalar fCachedC; |
| 886 | |
| 887 | // @} |
| 888 | |
| 889 | private: |
| 890 | typedef GrGLGradientEffect INHERITED; |
| 891 | |
| 892 | }; |
| 893 | |
| 894 | const GrBackendEffectFactory& CircleInside2PtConicalEffect::getFactory() const { |
| 895 | return GrTBackendEffectFactory<CircleInside2PtConicalEffect>::getInstance(); |
| 896 | } |
| 897 | |
| 898 | GR_DEFINE_EFFECT_TEST(CircleInside2PtConicalEffect); |
| 899 | |
| 900 | GrEffectRef* CircleInside2PtConicalEffect::TestCreate(SkRandom* random, |
| 901 | GrContext* context, |
| 902 | const GrDrawTargetCaps&, |
| 903 | GrTexture**) { |
| 904 | SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 905 | SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 906 | SkPoint center2; |
| 907 | SkScalar radius2; |
| 908 | do { |
| 909 | center2.set(random->nextUScalar1(), random->nextUScalar1()); |
| 910 | // Below makes sure that circle one is contained within circle two |
| 911 | SkScalar increase = random->nextUScalar1(); |
| 912 | SkPoint diff = center2 - center1; |
| 913 | SkScalar diffLen = diff.length(); |
| 914 | radius2 = radius1 + diffLen + increase; |
| 915 | // If the circles are identical the factory will give us an empty shader. |
| 916 | } while (radius1 == radius2 && center1 == center2); |
| 917 | |
| 918 | SkColor colors[kMaxRandomGradientColors]; |
| 919 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 920 | SkScalar* stops = stopsArray; |
| 921 | SkShader::TileMode tm; |
| 922 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 923 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| 924 | center2, radius2, |
| 925 | colors, stops, colorCount, |
| 926 | tm)); |
| 927 | SkPaint paint; |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 928 | return shader->asNewEffect(context, paint, NULL); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | GLCircleInside2PtConicalEffect::GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| 932 | const GrDrawEffect& drawEffect) |
| 933 | : INHERITED(factory) |
| 934 | , fVSVaryingName(NULL) |
| 935 | , fFSVaryingName(NULL) |
| 936 | , fCachedCenterX(SK_ScalarMax) |
| 937 | , fCachedCenterY(SK_ScalarMax) |
| 938 | , fCachedA(SK_ScalarMax) |
| 939 | , fCachedB(SK_ScalarMax) |
| 940 | , fCachedC(SK_ScalarMax) {} |
| 941 | |
| 942 | void GLCircleInside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, |
| 943 | const GrDrawEffect&, |
| 944 | EffectKey key, |
| 945 | const char* outputColor, |
| 946 | const char* inputColor, |
| 947 | const TransformedCoordsArray& coords, |
| 948 | const TextureSamplerArray& samplers) { |
| 949 | this->emitUniforms(builder, key); |
| 950 | fCenterUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 951 | kVec2f_GrSLType, "Conical2FSCenter"); |
| 952 | fParamUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 953 | kVec3f_GrSLType, "Conical2FSParams"); |
| 954 | SkString tName("t"); |
| 955 | |
| 956 | GrGLShaderVar center = builder->getUniformVariable(fCenterUni); |
| 957 | // params.x = A |
| 958 | // params.y = B |
| 959 | // params.z = C |
| 960 | GrGLShaderVar params = builder->getUniformVariable(fParamUni); |
| 961 | |
| 962 | // if we have a vec3 from being in perspective, convert it to a vec2 first |
skia.committer@gmail.com | ede0c5c | 2014-04-23 03:04:11 +0000 | [diff] [blame] | 963 | SkString coords2DString = builder->ensureFSCoords2D(coords, 0); |
| 964 | const char* coords2D = coords2DString.c_str(); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 965 | |
| 966 | // p = coords2D |
| 967 | // e = center end |
| 968 | // r = radius end |
| 969 | // A = dot(e, e) - r^2 + 2 * r - 1 |
| 970 | // B = (r -1) / A |
| 971 | // C = 1 / A |
| 972 | // d = dot(e, p) + B |
| 973 | // t = d +/- sqrt(d^2 - A * dot(p, p) + C) |
| 974 | builder->fsCodeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); |
| 975 | builder->fsCodeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), params.c_str()); |
| 976 | builder->fsCodeAppendf("\tfloat %s = d + sqrt(d * d - %s.x * pDotp + %s.z);\n", |
| 977 | tName.c_str(), params.c_str(), params.c_str()); |
| 978 | |
| 979 | this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); |
| 980 | } |
| 981 | |
| 982 | void GLCircleInside2PtConicalEffect::setData(const GrGLUniformManager& uman, |
| 983 | const GrDrawEffect& drawEffect) { |
| 984 | INHERITED::setData(uman, drawEffect); |
| 985 | const CircleInside2PtConicalEffect& data = drawEffect.castEffect<CircleInside2PtConicalEffect>(); |
| 986 | SkScalar centerX = data.centerX(); |
| 987 | SkScalar centerY = data.centerY(); |
| 988 | SkScalar A = data.A(); |
| 989 | SkScalar B = data.B(); |
| 990 | SkScalar C = data.C(); |
| 991 | |
| 992 | if (fCachedCenterX != centerX || fCachedCenterY != centerY || |
| 993 | fCachedA != A || fCachedB != B || fCachedC != C) { |
| 994 | |
| 995 | uman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); |
| 996 | uman.set3f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C)); |
| 997 | |
| 998 | fCachedCenterX = centerX; |
| 999 | fCachedCenterY = centerY; |
| 1000 | fCachedA = A; |
| 1001 | fCachedB = B; |
| 1002 | fCachedC = C; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | GrGLEffect::EffectKey GLCircleInside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, |
| 1007 | const GrGLCaps&) { |
| 1008 | EffectKey key = GenBaseGradientKey(drawEffect); |
| 1009 | return key; |
| 1010 | } |
| 1011 | |
| 1012 | ////////////////////////////////////////////////////////////////////////////// |
| 1013 | |
| 1014 | class GLCircleOutside2PtConicalEffect; |
| 1015 | |
| 1016 | class CircleOutside2PtConicalEffect : public GrGradientEffect { |
| 1017 | public: |
| 1018 | |
| 1019 | static GrEffectRef* Create(GrContext* ctx, |
| 1020 | const SkTwoPointConicalGradient& shader, |
| 1021 | const SkMatrix& matrix, |
| 1022 | SkShader::TileMode tm, |
| 1023 | const CircleConicalInfo& info) { |
| 1024 | AutoEffectUnref effect(SkNEW_ARGS(CircleOutside2PtConicalEffect, (ctx, shader, matrix, tm, info))); |
| 1025 | return CreateEffectRef(effect); |
| 1026 | } |
| 1027 | |
| 1028 | virtual ~CircleOutside2PtConicalEffect() {} |
| 1029 | |
| 1030 | static const char* Name() { return "Two-Point Conical Gradient Outside"; } |
| 1031 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| 1032 | |
| 1033 | SkScalar centerX() const { return fInfo.fCenterEnd.fX; } |
| 1034 | SkScalar centerY() const { return fInfo.fCenterEnd.fY; } |
| 1035 | SkScalar A() const { return fInfo.fA; } |
| 1036 | SkScalar B() const { return fInfo.fB; } |
| 1037 | SkScalar C() const { return fInfo.fC; } |
| 1038 | SkScalar tLimit() const { return fTLimit; } |
| 1039 | bool isFlipped() const { return fIsFlipped; } |
| 1040 | |
| 1041 | typedef GLCircleOutside2PtConicalEffect GLEffect; |
| 1042 | |
| 1043 | private: |
| 1044 | virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { |
| 1045 | const CircleOutside2PtConicalEffect& s = CastEffect<CircleOutside2PtConicalEffect>(sBase); |
| 1046 | return (INHERITED::onIsEqual(sBase) && |
| 1047 | this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && |
| 1048 | this->fInfo.fA == s.fInfo.fA && |
| 1049 | this->fInfo.fB == s.fInfo.fB && |
| 1050 | this->fInfo.fC == s.fInfo.fC && |
| 1051 | this->fTLimit == s.fTLimit && |
| 1052 | this->fIsFlipped == s.fIsFlipped); |
| 1053 | } |
| 1054 | |
| 1055 | CircleOutside2PtConicalEffect(GrContext* ctx, |
| 1056 | const SkTwoPointConicalGradient& shader, |
| 1057 | const SkMatrix& matrix, |
| 1058 | SkShader::TileMode tm, |
| 1059 | const CircleConicalInfo& info) |
| 1060 | : INHERITED(ctx, shader, matrix, tm), fInfo(info) { |
| 1061 | if (shader.getStartRadius() != shader.getEndRadius()) { |
| 1062 | fTLimit = SkScalarDiv(shader.getStartRadius(), (shader.getStartRadius() - shader.getEndRadius())); |
| 1063 | } else { |
| 1064 | fTLimit = SK_ScalarMin; |
| 1065 | } |
| 1066 | |
| 1067 | fIsFlipped = shader.isFlippedGrad(); |
| 1068 | } |
| 1069 | |
| 1070 | GR_DECLARE_EFFECT_TEST; |
| 1071 | |
| 1072 | const CircleConicalInfo fInfo; |
| 1073 | SkScalar fTLimit; |
| 1074 | bool fIsFlipped; |
| 1075 | |
| 1076 | typedef GrGradientEffect INHERITED; |
| 1077 | }; |
| 1078 | |
| 1079 | class GLCircleOutside2PtConicalEffect : public GrGLGradientEffect { |
| 1080 | public: |
| 1081 | GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); |
| 1082 | virtual ~GLCircleOutside2PtConicalEffect() {} |
| 1083 | |
| 1084 | virtual void emitCode(GrGLShaderBuilder*, |
| 1085 | const GrDrawEffect&, |
| 1086 | EffectKey, |
| 1087 | const char* outputColor, |
| 1088 | const char* inputColor, |
| 1089 | const TransformedCoordsArray&, |
| 1090 | const TextureSamplerArray&) SK_OVERRIDE; |
| 1091 | virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| 1092 | |
| 1093 | static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); |
| 1094 | |
| 1095 | protected: |
| 1096 | UniformHandle fCenterUni; |
| 1097 | UniformHandle fParamUni; |
| 1098 | |
| 1099 | const char* fVSVaryingName; |
| 1100 | const char* fFSVaryingName; |
| 1101 | |
| 1102 | bool fIsFlipped; |
| 1103 | |
| 1104 | // @{ |
| 1105 | /// Values last uploaded as uniforms |
| 1106 | |
| 1107 | SkScalar fCachedCenterX; |
| 1108 | SkScalar fCachedCenterY; |
| 1109 | SkScalar fCachedA; |
| 1110 | SkScalar fCachedB; |
| 1111 | SkScalar fCachedC; |
| 1112 | SkScalar fCachedTLimit; |
| 1113 | |
| 1114 | // @} |
| 1115 | |
| 1116 | private: |
| 1117 | typedef GrGLGradientEffect INHERITED; |
| 1118 | |
| 1119 | }; |
| 1120 | |
| 1121 | const GrBackendEffectFactory& CircleOutside2PtConicalEffect::getFactory() const { |
| 1122 | return GrTBackendEffectFactory<CircleOutside2PtConicalEffect>::getInstance(); |
| 1123 | } |
| 1124 | |
| 1125 | GR_DEFINE_EFFECT_TEST(CircleOutside2PtConicalEffect); |
| 1126 | |
| 1127 | GrEffectRef* CircleOutside2PtConicalEffect::TestCreate(SkRandom* random, |
| 1128 | GrContext* context, |
| 1129 | const GrDrawTargetCaps&, |
| 1130 | GrTexture**) { |
| 1131 | SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 1132 | SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1133 | SkPoint center2; |
| 1134 | SkScalar radius2; |
| 1135 | SkScalar diffLen; |
| 1136 | do { |
| 1137 | center2.set(random->nextUScalar1(), random->nextUScalar1()); |
| 1138 | // If the circles share a center than we can't be in the outside case |
| 1139 | } while (center1 == center2); |
| 1140 | SkPoint diff = center2 - center1; |
| 1141 | diffLen = diff.length(); |
| 1142 | // Below makes sure that circle one is not contained within circle two |
| 1143 | // and have radius2 >= radius to match sorting on cpu side |
commit-bot@chromium.org | 8089467 | 2014-04-22 21:24:22 +0000 | [diff] [blame] | 1144 | radius2 = radius1 + random->nextRangeF(0.f, diffLen); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1145 | |
| 1146 | SkColor colors[kMaxRandomGradientColors]; |
| 1147 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 1148 | SkScalar* stops = stopsArray; |
| 1149 | SkShader::TileMode tm; |
| 1150 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 1151 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, |
| 1152 | center2, radius2, |
| 1153 | colors, stops, colorCount, |
| 1154 | tm)); |
| 1155 | SkPaint paint; |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 1156 | return shader->asNewEffect(context, paint, NULL); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1157 | } |
| 1158 | |
| 1159 | GLCircleOutside2PtConicalEffect::GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, |
| 1160 | const GrDrawEffect& drawEffect) |
| 1161 | : INHERITED(factory) |
| 1162 | , fVSVaryingName(NULL) |
| 1163 | , fFSVaryingName(NULL) |
| 1164 | , fCachedCenterX(SK_ScalarMax) |
| 1165 | , fCachedCenterY(SK_ScalarMax) |
| 1166 | , fCachedA(SK_ScalarMax) |
| 1167 | , fCachedB(SK_ScalarMax) |
| 1168 | , fCachedC(SK_ScalarMax) |
| 1169 | , fCachedTLimit(SK_ScalarMax) { |
| 1170 | const CircleOutside2PtConicalEffect& data = drawEffect.castEffect<CircleOutside2PtConicalEffect>(); |
| 1171 | fIsFlipped = data.isFlipped(); |
| 1172 | } |
| 1173 | |
| 1174 | void GLCircleOutside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, |
| 1175 | const GrDrawEffect&, |
| 1176 | EffectKey key, |
| 1177 | const char* outputColor, |
| 1178 | const char* inputColor, |
| 1179 | const TransformedCoordsArray& coords, |
| 1180 | const TextureSamplerArray& samplers) { |
| 1181 | this->emitUniforms(builder, key); |
| 1182 | fCenterUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 1183 | kVec2f_GrSLType, "Conical2FSCenter"); |
| 1184 | fParamUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 1185 | kVec4f_GrSLType, "Conical2FSParams"); |
| 1186 | SkString tName("t"); |
| 1187 | |
| 1188 | GrGLShaderVar center = builder->getUniformVariable(fCenterUni); |
| 1189 | // params.x = A |
| 1190 | // params.y = B |
| 1191 | // params.z = C |
| 1192 | GrGLShaderVar params = builder->getUniformVariable(fParamUni); |
| 1193 | |
| 1194 | // if we have a vec3 from being in perspective, convert it to a vec2 first |
skia.committer@gmail.com | ede0c5c | 2014-04-23 03:04:11 +0000 | [diff] [blame] | 1195 | SkString coords2DString = builder->ensureFSCoords2D(coords, 0); |
| 1196 | const char* coords2D = coords2DString.c_str(); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1197 | |
| 1198 | // output will default to transparent black (we simply won't write anything |
| 1199 | // else to it if invalid, instead of discarding or returning prematurely) |
| 1200 | builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); |
| 1201 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1202 | // p = coords2D |
| 1203 | // e = center end |
| 1204 | // r = radius end |
| 1205 | // A = dot(e, e) - r^2 + 2 * r - 1 |
| 1206 | // B = (r -1) / A |
| 1207 | // C = 1 / A |
| 1208 | // d = dot(e, p) + B |
| 1209 | // t = d +/- sqrt(d^2 - A * dot(p, p) + C) |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1210 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1211 | builder->fsCodeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); |
| 1212 | builder->fsCodeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), params.c_str()); |
| 1213 | builder->fsCodeAppendf("\tfloat deter = d * d - %s.x * pDotp + %s.z;\n", params.c_str(), params.c_str()); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1214 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1215 | // Must check to see if we flipped the circle order (to make sure start radius < end radius) |
| 1216 | // If so we must also flip sign on sqrt |
| 1217 | if (!fIsFlipped) { |
| 1218 | builder->fsCodeAppendf("\tfloat %s = d + sqrt(deter);\n", tName.c_str()); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1219 | } else { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1220 | builder->fsCodeAppendf("\tfloat %s = d - sqrt(deter);\n", tName.c_str()); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1221 | } |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1222 | |
| 1223 | builder->fsCodeAppendf("\tif (%s >= %s.w && deter >= 0.0) {\n", tName.c_str(), params.c_str()); |
| 1224 | builder->fsCodeAppend("\t\t"); |
| 1225 | this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); |
| 1226 | builder->fsCodeAppend("\t}\n"); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1227 | } |
| 1228 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1229 | void GLCircleOutside2PtConicalEffect::setData(const GrGLUniformManager& uman, |
| 1230 | const GrDrawEffect& drawEffect) { |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1231 | INHERITED::setData(uman, drawEffect); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1232 | const CircleOutside2PtConicalEffect& data = drawEffect.castEffect<CircleOutside2PtConicalEffect>(); |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 1233 | SkASSERT(data.isFlipped() == fIsFlipped); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1234 | SkScalar centerX = data.centerX(); |
| 1235 | SkScalar centerY = data.centerY(); |
| 1236 | SkScalar A = data.A(); |
| 1237 | SkScalar B = data.B(); |
| 1238 | SkScalar C = data.C(); |
| 1239 | SkScalar tLimit = data.tLimit(); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1240 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1241 | if (fCachedCenterX != centerX || fCachedCenterY != centerY || |
| 1242 | fCachedA != A || fCachedB != B || fCachedC != C || fCachedTLimit != tLimit) { |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1243 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1244 | uman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); |
| 1245 | uman.set4f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C), |
| 1246 | SkScalarToFloat(tLimit)); |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1247 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1248 | fCachedCenterX = centerX; |
| 1249 | fCachedCenterY = centerY; |
| 1250 | fCachedA = A; |
| 1251 | fCachedB = B; |
| 1252 | fCachedC = C; |
| 1253 | fCachedTLimit = tLimit; |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1254 | } |
| 1255 | } |
| 1256 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1257 | GrGLEffect::EffectKey GLCircleOutside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, |
| 1258 | const GrGLCaps&) { |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1259 | enum { |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1260 | kIsFlipped = 1 << kBaseKeyBitCnt, |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1261 | }; |
| 1262 | |
| 1263 | EffectKey key = GenBaseGradientKey(drawEffect); |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1264 | |
| 1265 | if (drawEffect.castEffect<CircleOutside2PtConicalEffect>().isFlipped()) { |
commit-bot@chromium.org | 44d83c1 | 2014-04-21 13:10:25 +0000 | [diff] [blame] | 1266 | key |= kIsFlipped; |
| 1267 | } |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1268 | return key; |
| 1269 | } |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 1270 | |
| 1271 | ////////////////////////////////////////////////////////////////////////////// |
| 1272 | |
| 1273 | GrEffectRef* Gr2PtConicalGradientEffect::Create(GrContext* ctx, |
| 1274 | const SkTwoPointConicalGradient& shader, |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 1275 | SkShader::TileMode tm, |
| 1276 | const SkMatrix* localMatrix) { |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 1277 | SkMatrix matrix; |
| 1278 | if (!shader.getLocalMatrix().invert(&matrix)) { |
| 1279 | return NULL; |
| 1280 | } |
commit-bot@chromium.org | 96fb748 | 2014-05-09 20:28:11 +0000 | [diff] [blame] | 1281 | if (localMatrix) { |
| 1282 | SkMatrix inv; |
| 1283 | if (!localMatrix->invert(&inv)) { |
| 1284 | return NULL; |
| 1285 | } |
| 1286 | matrix.postConcat(inv); |
| 1287 | } |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 1288 | |
commit-bot@chromium.org | c8379d7 | 2014-04-22 20:56:37 +0000 | [diff] [blame] | 1289 | if (shader.getStartRadius() < kErrorTol) { |
| 1290 | SkScalar focalX; |
| 1291 | ConicalType type = set_matrix_focal_conical(shader, &matrix, &focalX); |
| 1292 | if (type == kInside_ConicalType) { |
| 1293 | return FocalInside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); |
| 1294 | } else if(type == kEdge_ConicalType) { |
| 1295 | set_matrix_edge_conical(shader, &matrix); |
| 1296 | return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); |
| 1297 | } else { |
| 1298 | return FocalOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); |
| 1299 | } |
| 1300 | } |
| 1301 | |
| 1302 | CircleConicalInfo info; |
| 1303 | ConicalType type = set_matrix_circle_conical(shader, &matrix, &info); |
| 1304 | |
| 1305 | if (type == kInside_ConicalType) { |
| 1306 | return CircleInside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); |
| 1307 | } else if (type == kEdge_ConicalType) { |
| 1308 | set_matrix_edge_conical(shader, &matrix); |
| 1309 | return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); |
| 1310 | } else { |
| 1311 | return CircleOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); |
| 1312 | } |
commit-bot@chromium.org | 2af1a2d | 2014-04-04 13:50:50 +0000 | [diff] [blame] | 1313 | } |
| 1314 | |
commit-bot@chromium.org | aa64fbf | 2014-04-03 14:59:19 +0000 | [diff] [blame] | 1315 | #endif |