joshualitt | 9ff6425 | 2015-08-10 09:03:51 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2015 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 | #include "GrAAFillRectBatch.h" |
| 9 | |
| 10 | #include "GrDefaultGeoProcFactory.h" |
| 11 | #include "GrResourceKey.h" |
| 12 | #include "GrResourceProvider.h" |
| 13 | |
| 14 | GR_DECLARE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey); |
| 15 | |
| 16 | static void set_inset_fan(SkPoint* pts, size_t stride, |
| 17 | const SkRect& r, SkScalar dx, SkScalar dy) { |
| 18 | pts->setRectFan(r.fLeft + dx, r.fTop + dy, |
| 19 | r.fRight - dx, r.fBottom - dy, stride); |
| 20 | } |
| 21 | |
| 22 | static const GrGeometryProcessor* create_fill_rect_gp(bool tweakAlphaForCoverage, |
| 23 | const SkMatrix& viewMatrix, |
| 24 | bool usesLocalCoords, |
| 25 | bool coverageIgnored) { |
| 26 | using namespace GrDefaultGeoProcFactory; |
| 27 | |
| 28 | Color color(Color::kAttribute_Type); |
| 29 | Coverage::Type coverageType; |
| 30 | // TODO remove coverage if coverage is ignored |
| 31 | /*if (coverageIgnored) { |
| 32 | coverageType = Coverage::kNone_Type; |
| 33 | } else*/ if (tweakAlphaForCoverage) { |
| 34 | coverageType = Coverage::kSolid_Type; |
| 35 | } else { |
| 36 | coverageType = Coverage::kAttribute_Type; |
| 37 | } |
| 38 | Coverage coverage(coverageType); |
| 39 | LocalCoords localCoords(usesLocalCoords ? LocalCoords::kUsePosition_Type : |
| 40 | LocalCoords::kUnused_Type); |
| 41 | return CreateForDeviceSpace(color, coverage, localCoords, viewMatrix); |
| 42 | } |
| 43 | |
| 44 | void GrAAFillRectBatch::initBatchTracker(const GrPipelineInfo& init) { |
| 45 | // Handle any color overrides |
| 46 | if (!init.readsColor()) { |
| 47 | fGeoData[0].fColor = GrColor_ILLEGAL; |
| 48 | } |
| 49 | init.getOverrideColorIfSet(&fGeoData[0].fColor); |
| 50 | |
| 51 | // setup batch properties |
| 52 | fBatch.fColorIgnored = !init.readsColor(); |
| 53 | fBatch.fColor = fGeoData[0].fColor; |
| 54 | fBatch.fUsesLocalCoords = init.readsLocalCoords(); |
| 55 | fBatch.fCoverageIgnored = !init.readsCoverage(); |
| 56 | fBatch.fCanTweakAlphaForCoverage = init.canTweakAlphaForCoverage(); |
| 57 | } |
| 58 | |
| 59 | void GrAAFillRectBatch::generateGeometry(GrBatchTarget* batchTarget) { |
| 60 | bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage(); |
| 61 | |
| 62 | SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage, |
| 63 | this->viewMatrix(), |
| 64 | this->usesLocalCoords(), |
| 65 | this->coverageIgnored())); |
| 66 | if (!gp) { |
| 67 | SkDebugf("Couldn't create GrGeometryProcessor\n"); |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | batchTarget->initDraw(gp, this->pipeline()); |
| 72 | |
| 73 | size_t vertexStride = gp->getVertexStride(); |
| 74 | SkASSERT(canTweakAlphaForCoverage ? |
| 75 | vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) : |
| 76 | vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr)); |
| 77 | int instanceCount = fGeoData.count(); |
| 78 | |
| 79 | SkAutoTUnref<const GrIndexBuffer> indexBuffer(this->getIndexBuffer( |
| 80 | batchTarget->resourceProvider())); |
| 81 | InstancedHelper helper; |
| 82 | void* vertices = helper.init(batchTarget, kTriangles_GrPrimitiveType, vertexStride, |
| 83 | indexBuffer, kVertsPerAAFillRect, kIndicesPerAAFillRect, |
| 84 | instanceCount); |
| 85 | if (!vertices || !indexBuffer) { |
| 86 | SkDebugf("Could not allocate vertices\n"); |
| 87 | return; |
| 88 | } |
| 89 | |
| 90 | for (int i = 0; i < instanceCount; i++) { |
| 91 | const Geometry& args = fGeoData[i]; |
| 92 | this->generateAAFillRectGeometry(vertices, |
| 93 | i * kVertsPerAAFillRect * vertexStride, |
| 94 | vertexStride, |
| 95 | args.fColor, |
| 96 | args.fViewMatrix, |
| 97 | args.fRect, |
| 98 | args.fDevRect, |
| 99 | canTweakAlphaForCoverage); |
| 100 | } |
| 101 | |
| 102 | helper.issueDraw(batchTarget); |
| 103 | } |
| 104 | |
| 105 | const GrIndexBuffer* GrAAFillRectBatch::getIndexBuffer(GrResourceProvider* resourceProvider) { |
| 106 | GR_DEFINE_STATIC_UNIQUE_KEY(gAAFillRectIndexBufferKey); |
| 107 | |
| 108 | static const uint16_t gFillAARectIdx[] = { |
| 109 | 0, 1, 5, 5, 4, 0, |
| 110 | 1, 2, 6, 6, 5, 1, |
| 111 | 2, 3, 7, 7, 6, 2, |
| 112 | 3, 0, 4, 4, 7, 3, |
| 113 | 4, 5, 6, 6, 7, 4, |
| 114 | }; |
| 115 | GR_STATIC_ASSERT(SK_ARRAY_COUNT(gFillAARectIdx) == kIndicesPerAAFillRect); |
| 116 | return resourceProvider->findOrCreateInstancedIndexBuffer(gFillAARectIdx, |
| 117 | kIndicesPerAAFillRect, kNumAAFillRectsInIndexBuffer, kVertsPerAAFillRect, |
| 118 | gAAFillRectIndexBufferKey); |
| 119 | } |
| 120 | |
| 121 | bool GrAAFillRectBatch::onCombineIfPossible(GrBatch* t) { |
| 122 | if (!this->pipeline()->isEqual(*t->pipeline())) { |
| 123 | return false; |
| 124 | } |
| 125 | |
| 126 | GrAAFillRectBatch* that = t->cast<GrAAFillRectBatch>(); |
| 127 | |
| 128 | SkASSERT(this->usesLocalCoords() == that->usesLocalCoords()); |
| 129 | // We apply the viewmatrix to the rect points on the cpu. However, if the pipeline uses |
| 130 | // local coords then we won't be able to batch. We could actually upload the viewmatrix |
| 131 | // using vertex attributes in these cases, but haven't investigated that |
| 132 | if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) { |
| 133 | return false; |
| 134 | } |
| 135 | |
| 136 | if (this->color() != that->color()) { |
| 137 | fBatch.fColor = GrColor_ILLEGAL; |
| 138 | } |
| 139 | |
| 140 | // In the event of two batches, one who can tweak, one who cannot, we just fall back to |
| 141 | // not tweaking |
| 142 | if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) { |
| 143 | fBatch.fCanTweakAlphaForCoverage = false; |
| 144 | } |
| 145 | |
| 146 | fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin()); |
| 147 | this->joinBounds(that->bounds()); |
| 148 | return true; |
| 149 | } |
| 150 | |
| 151 | void GrAAFillRectBatch::generateAAFillRectGeometry(void* vertices, |
| 152 | size_t offset, |
| 153 | size_t vertexStride, |
| 154 | GrColor color, |
| 155 | const SkMatrix& viewMatrix, |
| 156 | const SkRect& rect, |
| 157 | const SkRect& devRect, |
| 158 | bool tweakAlphaForCoverage) const { |
| 159 | intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset; |
| 160 | |
| 161 | SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts); |
| 162 | SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride); |
| 163 | |
| 164 | SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1); |
| 165 | inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height()); |
| 166 | |
| 167 | if (viewMatrix.rectStaysRect()) { |
| 168 | set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf); |
| 169 | set_inset_fan(fan1Pos, vertexStride, devRect, inset, inset); |
| 170 | } else { |
| 171 | // compute transformed (1, 0) and (0, 1) vectors |
| 172 | SkVector vec[2] = { |
| 173 | { viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] }, |
| 174 | { viewMatrix[SkMatrix::kMSkewX], viewMatrix[SkMatrix::kMScaleY] } |
| 175 | }; |
| 176 | |
| 177 | vec[0].normalize(); |
| 178 | vec[0].scale(SK_ScalarHalf); |
| 179 | vec[1].normalize(); |
| 180 | vec[1].scale(SK_ScalarHalf); |
| 181 | |
| 182 | // create the rotated rect |
| 183 | fan0Pos->setRectFan(rect.fLeft, rect.fTop, |
| 184 | rect.fRight, rect.fBottom, vertexStride); |
| 185 | viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4); |
| 186 | |
| 187 | // Now create the inset points and then outset the original |
| 188 | // rotated points |
| 189 | |
| 190 | // TL |
| 191 | *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) = |
| 192 | *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1]; |
| 193 | *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1]; |
| 194 | // BL |
| 195 | *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) = |
| 196 | *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1]; |
| 197 | *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1]; |
| 198 | // BR |
| 199 | *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) = |
| 200 | *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1]; |
| 201 | *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1]; |
| 202 | // TR |
| 203 | *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) = |
| 204 | *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1]; |
| 205 | *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1]; |
| 206 | } |
| 207 | |
| 208 | // Make verts point to vertex color and then set all the color and coverage vertex attrs |
| 209 | // values. |
| 210 | verts += sizeof(SkPoint); |
| 211 | for (int i = 0; i < 4; ++i) { |
| 212 | if (tweakAlphaForCoverage) { |
| 213 | *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0; |
| 214 | } else { |
| 215 | *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; |
| 216 | *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | int scale; |
| 221 | if (inset < SK_ScalarHalf) { |
| 222 | scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf)); |
| 223 | SkASSERT(scale >= 0 && scale <= 255); |
| 224 | } else { |
| 225 | scale = 0xff; |
| 226 | } |
| 227 | |
| 228 | verts += 4 * vertexStride; |
| 229 | |
| 230 | float innerCoverage = GrNormalizeByteToFloat(scale); |
| 231 | GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale); |
| 232 | |
| 233 | for (int i = 0; i < 4; ++i) { |
| 234 | if (tweakAlphaForCoverage) { |
| 235 | *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor; |
| 236 | } else { |
| 237 | *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color; |
| 238 | *reinterpret_cast<float*>(verts + i * vertexStride + |
| 239 | sizeof(GrColor)) = innerCoverage; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /////////////////////////////////////////////////////////////////////////////////////////////////// |
| 245 | |
| 246 | #ifdef GR_TEST_UTILS |
| 247 | |
| 248 | #include "GrBatchTest.h" |
| 249 | |
| 250 | BATCH_TEST_DEFINE(AAFillRectBatch) { |
| 251 | GrAAFillRectBatch::Geometry geo; |
| 252 | geo.fColor = GrRandomColor(random); |
| 253 | geo.fViewMatrix = GrTest::TestMatrix(random); |
| 254 | geo.fRect = GrTest::TestRect(random); |
| 255 | geo.fDevRect = GrTest::TestRect(random); |
| 256 | return GrAAFillRectBatch::Create(geo); |
| 257 | } |
| 258 | |
| 259 | #endif |