commit-bot@chromium.org | 78a1078 | 2013-08-21 19:27:48 +0000 | [diff] [blame^] | 1 | |
| 2 | /* |
| 3 | * Copyright 2013 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 | */ |
| 8 | |
| 9 | // This test only works with the GPU backend. |
| 10 | |
| 11 | #include "gm.h" |
| 12 | |
| 13 | #if SK_SUPPORT_GPU && 0 // Can be enabled when cubic effect is checked in. |
| 14 | |
| 15 | #include "GrContext.h" |
| 16 | #include "GrPathUtils.h" |
| 17 | #include "GrTest.h" |
| 18 | #include "SkColorPriv.h" |
| 19 | #include "SkDevice.h" |
| 20 | |
| 21 | // Position & KLM line eq values. These are the vertex attributes for Bezier curves. The last value |
| 22 | // of the Vec4f is ignored. |
| 23 | extern const GrVertexAttrib kAttribs[] = { |
| 24 | {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, |
| 25 | {kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding} |
| 26 | }; |
| 27 | |
| 28 | static inline SkScalar eval_line(const SkPoint& p, const SkScalar lineEq[3], SkScalar sign) { |
| 29 | return sign * (lineEq[0] * p.fX + lineEq[1] * p.fY + lineEq[2]); |
| 30 | } |
| 31 | |
| 32 | namespace skiagm { |
| 33 | /** |
| 34 | * This GM directly exercises effects that draw Bezier curves in the GPU backend. |
| 35 | */ |
| 36 | class BezierEffects : public GM { |
| 37 | public: |
| 38 | BezierEffects() { |
| 39 | this->setBGColor(0xFFFFFFFF); |
| 40 | } |
| 41 | |
| 42 | protected: |
| 43 | virtual SkString onShortName() SK_OVERRIDE { |
| 44 | return SkString("bezier_effects"); |
| 45 | } |
| 46 | |
| 47 | virtual SkISize onISize() SK_OVERRIDE { |
| 48 | return make_isize(800, 800); |
| 49 | } |
| 50 | |
| 51 | virtual uint32_t onGetFlags() const SK_OVERRIDE { |
| 52 | // This is a GPU-specific GM. |
| 53 | return kGPUOnly_Flag; |
| 54 | } |
| 55 | |
| 56 | |
| 57 | virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 58 | SkDevice* device = canvas->getTopDevice(); |
| 59 | GrRenderTarget* rt = device->accessRenderTarget(); |
| 60 | if (NULL == rt) { |
| 61 | return; |
| 62 | } |
| 63 | GrContext* context = rt->getContext(); |
| 64 | if (NULL == context) { |
| 65 | return; |
| 66 | } |
| 67 | |
| 68 | struct Vertex { |
| 69 | SkPoint fPosition; |
| 70 | float fKLM[4]; // The last value is ignored. The effect expects a vec4f. |
| 71 | }; |
| 72 | |
| 73 | static const int kNumCubics = 10; |
| 74 | SkMWCRandom rand; |
| 75 | |
| 76 | int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumCubics))); |
| 77 | int numRows = SkScalarCeilToInt(SkIntToScalar(kNumCubics) / numCols); |
| 78 | SkScalar w = SkIntToScalar(rt->width()) / numCols; |
| 79 | SkScalar h = SkIntToScalar(rt->height()) / numRows; |
| 80 | int row = 0; |
| 81 | int col = 0; |
| 82 | |
| 83 | for (int i = 0; i < kNumCubics; ++i) { |
| 84 | SkScalar x = SkScalarMul(col, w); |
| 85 | SkScalar y = SkScalarMul(row, h); |
| 86 | SkPoint controlPts[] = { |
| 87 | {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)}, |
| 88 | {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)}, |
| 89 | {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)}, |
| 90 | {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)} |
| 91 | }; |
| 92 | SkPoint chopped[10]; |
| 93 | SkScalar klmEqs[9]; |
| 94 | SkScalar klmSigns[3]; |
| 95 | int cnt = GrPathUtils::chopCubicAtLoopIntersection(controlPts, |
| 96 | chopped, |
| 97 | klmEqs, |
| 98 | klmSigns, |
| 99 | controlPts); |
| 100 | |
| 101 | SkPaint ctrlPtPaint; |
| 102 | ctrlPtPaint.setColor(rand.nextU() | 0xFF000000); |
| 103 | for (int i = 0; i < 4; ++i) { |
| 104 | canvas->drawCircle(controlPts[i].fX, controlPts[i].fY, 6.f, ctrlPtPaint); |
| 105 | } |
| 106 | |
| 107 | SkPaint polyPaint; |
| 108 | polyPaint.setColor(0xffA0A0A0); |
| 109 | polyPaint.setStrokeWidth(0); |
| 110 | polyPaint.setStyle(SkPaint::kStroke_Style); |
| 111 | canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, controlPts, polyPaint); |
| 112 | |
| 113 | SkPaint choppedPtPaint; |
| 114 | choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000); |
| 115 | |
| 116 | for (int c = 0; c < cnt; ++c) { |
| 117 | SkPoint* pts = chopped + 3 * c; |
| 118 | |
| 119 | for (int i = 0; i < 4; ++i) { |
| 120 | canvas->drawCircle(pts[i].fX, pts[i].fY, 3.f, choppedPtPaint); |
| 121 | } |
| 122 | |
| 123 | SkRect bounds; |
| 124 | bounds.set(pts, 4); |
| 125 | |
| 126 | SkPaint boundsPaint; |
| 127 | boundsPaint.setColor(0xff808080); |
| 128 | boundsPaint.setStrokeWidth(0); |
| 129 | boundsPaint.setStyle(SkPaint::kStroke_Style); |
| 130 | canvas->drawRect(bounds, boundsPaint); |
| 131 | |
| 132 | Vertex verts[4]; |
| 133 | verts[0].fPosition.setRectFan(bounds.fLeft, bounds.fTop, |
| 134 | bounds.fRight, bounds.fBottom, |
| 135 | sizeof(Vertex)); |
| 136 | for (int v = 0; v < 4; ++v) { |
| 137 | verts[v].fKLM[0] = eval_line(verts[v].fPosition, klmEqs + 0, klmSigns[c]); |
| 138 | verts[v].fKLM[1] = eval_line(verts[v].fPosition, klmEqs + 3, klmSigns[c]); |
| 139 | verts[v].fKLM[2] = eval_line(verts[v].fPosition, klmEqs + 6, 1.f); |
| 140 | } |
| 141 | |
| 142 | GrTestTarget tt; |
| 143 | context->getTestTarget(&tt); |
| 144 | if (NULL == tt.target()) { |
| 145 | continue; |
| 146 | } |
| 147 | GrDrawState* drawState = tt.target()->drawState(); |
| 148 | drawState->setVertexAttribs<kAttribs>(2); |
| 149 | SkAutoTUnref<GrEffectRef> effect(HairCubicEdgeEffect::Create()); |
| 150 | if (!effect) { |
| 151 | continue; |
| 152 | } |
| 153 | drawState->addCoverageEffect(effect, 1); |
| 154 | drawState->setRenderTarget(rt); |
| 155 | drawState->setColor(0xff000000); |
| 156 | |
| 157 | tt.target()->setVertexSourceToArray(verts, 4); |
| 158 | tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer()); |
| 159 | tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6); |
| 160 | } |
| 161 | ++col; |
| 162 | if (numCols == col) { |
| 163 | col = 0; |
| 164 | ++row; |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | private: |
| 170 | typedef GM INHERITED; |
| 171 | }; |
| 172 | |
| 173 | ////////////////////////////////////////////////////////////////////////////// |
| 174 | |
| 175 | DEF_GM( return SkNEW(BezierEffects); ) |
| 176 | |
| 177 | } |
| 178 | |
| 179 | #endif |