Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 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 "gm.h" |
| 9 | #include "sk_tool_utils.h" |
| 10 | #include "SkLightingShader.h" |
| 11 | #include "SkNormalSource.h" |
| 12 | #include "SkPoint3.h" |
| 13 | #include "SkShader.h" |
| 14 | #include "SkTypeface.h" |
| 15 | |
| 16 | // Create a truncated pyramid normal map |
| 17 | static SkBitmap make_frustum_normalmap(int texSize) { |
| 18 | SkBitmap frustum; |
| 19 | frustum.allocN32Pixels(texSize, texSize); |
| 20 | |
| 21 | sk_tool_utils::create_frustum_normal_map(&frustum, SkIRect::MakeWH(texSize, texSize)); |
| 22 | return frustum; |
| 23 | } |
| 24 | |
| 25 | namespace skiagm { |
| 26 | |
| 27 | // This GM exercises lighting shaders. Specifically, nullptr arguments, scaling when using |
| 28 | // normal maps, paint transparency, zero directional lights, multiple directional lights. |
| 29 | class LightingShader2GM : public GM { |
| 30 | public: |
| 31 | LightingShader2GM() : fRect(SkRect::MakeIWH(kTexSize, kTexSize)) { |
| 32 | this->setBGColor(sk_tool_utils::color_to_565(0xFF0000CC)); |
| 33 | } |
| 34 | |
| 35 | protected: |
| 36 | SkString onShortName() override { |
| 37 | return SkString("lightingshader2"); |
| 38 | } |
| 39 | |
| 40 | SkISize onISize() override { |
| 41 | return SkISize::Make(600, 740); |
| 42 | } |
| 43 | |
| 44 | void onOnceBeforeDraw() override { |
| 45 | // The light direction is towards the light with +Z coming out of the screen |
| 46 | const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0.473f); |
| 47 | const SkVector3 kLightFromUpperLeft = SkVector3::Make(-0.788f, 0.394f, 0.473f); |
| 48 | |
| 49 | // Standard set of lights |
| 50 | { |
| 51 | SkLights::Builder builder; |
| 52 | builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 1.0f, 1.0f), |
| 53 | kLightFromUpperRight)); |
| 54 | builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f)); |
| 55 | fLights = builder.finish(); |
| 56 | } |
| 57 | |
| 58 | // No directional lights |
| 59 | { |
| 60 | SkLights::Builder builder; |
| 61 | builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f)); |
| 62 | fLightsNoDir = builder.finish(); |
| 63 | } |
| 64 | |
| 65 | // Two directional lights |
| 66 | { |
| 67 | SkLights::Builder builder; |
| 68 | builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(1.0f, 0.0f, 0.0f), |
| 69 | kLightFromUpperRight)); |
| 70 | builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.0f, 1.0f, 0.0f), |
| 71 | kLightFromUpperLeft)); |
| 72 | builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f)); |
| 73 | fLightsTwoDir = builder.finish(); |
| 74 | } |
| 75 | |
| 76 | SkMatrix matrix; |
| 77 | SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize); |
| 78 | matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit); |
| 79 | |
| 80 | SkBitmap opaqueDiffuseMap = sk_tool_utils::create_checkerboard_bitmap( |
| 81 | kTexSize, kTexSize, SK_ColorBLACK, |
Mike Klein | d46dce3 | 2018-08-16 10:17:03 -0400 | [diff] [blame] | 82 | 0xFF808080, |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 83 | 8); |
| 84 | fOpaqueDiffuse = SkShader::MakeBitmapShader(opaqueDiffuseMap, SkShader::kClamp_TileMode, |
| 85 | SkShader::kClamp_TileMode, &matrix); |
| 86 | |
| 87 | SkBitmap translucentDiffuseMap = sk_tool_utils::create_checkerboard_bitmap( |
| 88 | kTexSize, kTexSize, |
| 89 | SkColorSetARGB(0x55, 0x00, 0x00, 0x00), |
| 90 | SkColorSetARGB(0x55, 0x80, 0x80, 0x80), |
| 91 | 8); |
| 92 | fTranslucentDiffuse = SkShader::MakeBitmapShader(translucentDiffuseMap, |
| 93 | SkShader::kClamp_TileMode, |
| 94 | SkShader::kClamp_TileMode, &matrix); |
| 95 | |
| 96 | SkBitmap normalMap = make_frustum_normalmap(kTexSize); |
| 97 | fNormalMapShader = SkShader::MakeBitmapShader(normalMap, SkShader::kClamp_TileMode, |
| 98 | SkShader::kClamp_TileMode, &matrix); |
| 99 | |
| 100 | } |
| 101 | |
| 102 | // Scales shape around origin, rotates shape around origin, then translates shape to origin |
| 103 | void positionCTM(SkCanvas *canvas, SkScalar scaleX, SkScalar scaleY, SkScalar rotate) const { |
| 104 | canvas->translate(kTexSize/2.0f, kTexSize/2.0f); |
| 105 | canvas->scale(scaleX, scaleY); |
| 106 | canvas->rotate(rotate); |
| 107 | canvas->translate(-kTexSize/2.0f, -kTexSize/2.0f); |
| 108 | } |
| 109 | |
| 110 | void drawRect(SkCanvas* canvas, SkScalar scaleX, SkScalar scaleY, |
| 111 | SkScalar rotate, bool useNormalSource, bool useDiffuseShader, |
| 112 | bool useTranslucentPaint, bool useTranslucentShader, sk_sp<SkLights> lights) { |
| 113 | canvas->save(); |
| 114 | |
| 115 | this->positionCTM(canvas, scaleX, scaleY, rotate); |
| 116 | |
| 117 | const SkMatrix& ctm = canvas->getTotalMatrix(); |
| 118 | |
| 119 | SkPaint paint; |
| 120 | sk_sp<SkNormalSource> normalSource = nullptr; |
| 121 | sk_sp<SkShader> diffuseShader = nullptr; |
| 122 | |
| 123 | if (useNormalSource) { |
| 124 | normalSource = SkNormalSource::MakeFromNormalMap(fNormalMapShader, ctm); |
| 125 | } |
| 126 | |
| 127 | if (useDiffuseShader) { |
| 128 | diffuseShader = (useTranslucentShader) ? fTranslucentDiffuse : fOpaqueDiffuse; |
| 129 | } else { |
| 130 | paint.setColor(SK_ColorGREEN); |
| 131 | } |
| 132 | |
| 133 | if (useTranslucentPaint) { |
| 134 | paint.setAlpha(0x99); |
| 135 | } |
| 136 | |
| 137 | paint.setShader(SkLightingShader::Make(std::move(diffuseShader), std::move(normalSource), |
| 138 | std::move(lights))); |
| 139 | canvas->drawRect(fRect, paint); |
| 140 | |
| 141 | canvas->restore(); |
| 142 | } |
| 143 | |
| 144 | void onDraw(SkCanvas* canvas) override { |
| 145 | SkPaint labelPaint; |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame] | 146 | SkFont font( |
| 147 | sk_tool_utils::create_portable_typeface("sans-serif", SkFontStyle()), kLabelSize); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 148 | |
| 149 | int gridNum = 0; |
| 150 | |
| 151 | // Running through all possible bool parameter combinations |
| 152 | for (bool useNormalSource : {true, false}) { |
| 153 | for (bool useDiffuseShader : {true, false}) { |
| 154 | for (bool useTranslucentPaint : {true, false}) { |
| 155 | for (bool useTranslucentShader : {true, false}) { |
| 156 | |
| 157 | // Determining position |
| 158 | SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth; |
| 159 | SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth; |
| 160 | |
| 161 | canvas->save(); |
| 162 | |
| 163 | canvas->translate(xPos, yPos); |
| 164 | this->drawRect(canvas, 1.0f, 1.0f, 0.f, useNormalSource, useDiffuseShader, |
| 165 | useTranslucentPaint, useTranslucentShader, fLights); |
| 166 | // Drawing labels |
| 167 | canvas->translate(0.0f, SkIntToScalar(kTexSize)); |
| 168 | { |
| 169 | canvas->translate(0.0f, kLabelSize); |
| 170 | SkString label; |
| 171 | label.appendf("useNormalSource: %d", useNormalSource); |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame] | 172 | canvas->drawString(label, 0.0f, 0.0f, font, labelPaint); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 173 | } |
| 174 | { |
| 175 | canvas->translate(0.0f, kLabelSize); |
| 176 | SkString label; |
| 177 | label.appendf("useDiffuseShader: %d", useDiffuseShader); |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame] | 178 | canvas->drawString(label, 0.0f, 0.0f, font, labelPaint); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 179 | } |
| 180 | { |
| 181 | canvas->translate(0.0f, kLabelSize); |
| 182 | SkString label; |
| 183 | label.appendf("useTranslucentPaint: %d", useTranslucentPaint); |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame] | 184 | canvas->drawString(label, 0.0f, 0.0f, font, labelPaint); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 185 | } |
| 186 | { |
| 187 | canvas->translate(0.0f, kLabelSize); |
| 188 | SkString label; |
| 189 | label.appendf("useTranslucentShader: %d", useTranslucentShader); |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame] | 190 | canvas->drawString(label, 0.0f, 0.0f, font, labelPaint); |
Robert Phillips | a8cdbd7 | 2018-07-17 12:30:40 -0400 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | canvas->restore(); |
| 194 | |
| 195 | gridNum++; |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | |
| 202 | // Rotation/scale test |
| 203 | { |
| 204 | SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth; |
| 205 | SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth; |
| 206 | |
| 207 | canvas->save(); |
| 208 | canvas->translate(xPos, yPos); |
| 209 | this->drawRect(canvas, 0.6f, 0.6f, 45.0f, true, true, true, true, fLights); |
| 210 | canvas->restore(); |
| 211 | |
| 212 | gridNum++; |
| 213 | } |
| 214 | |
| 215 | // Anisotropic scale test |
| 216 | { |
| 217 | SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth; |
| 218 | SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth; |
| 219 | |
| 220 | canvas->save(); |
| 221 | canvas->translate(xPos, yPos); |
| 222 | this->drawRect(canvas, 0.6f, 0.4f, 30.0f, true, true, true, true, fLights); |
| 223 | canvas->restore(); |
| 224 | |
| 225 | gridNum++; |
| 226 | } |
| 227 | |
| 228 | // No directional lights test |
| 229 | { |
| 230 | SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth; |
| 231 | SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth; |
| 232 | |
| 233 | canvas->save(); |
| 234 | canvas->translate(xPos, yPos); |
| 235 | this->drawRect(canvas, 1.0f, 1.0f, 0.0f, true, true, false, false, fLightsNoDir); |
| 236 | canvas->restore(); |
| 237 | |
| 238 | gridNum++; |
| 239 | } |
| 240 | |
| 241 | // Two directional lights test |
| 242 | { |
| 243 | SkScalar xPos = (gridNum % kGridColumnNum) * kGridCellWidth; |
| 244 | SkScalar yPos = (gridNum / kGridColumnNum) * kGridCellWidth; |
| 245 | |
| 246 | canvas->save(); |
| 247 | canvas->translate(xPos, yPos); |
| 248 | this->drawRect(canvas, 1.0f, 1.0f, 0.0f, true, true, false, false, fLightsTwoDir); |
| 249 | canvas->restore(); |
| 250 | |
| 251 | gridNum++; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | private: |
| 256 | static constexpr int kTexSize = 96; |
| 257 | static constexpr int kNumBooleanParams = 4; |
| 258 | static constexpr SkScalar kLabelSize = 10.0f; |
| 259 | static constexpr int kGridColumnNum = 4; |
| 260 | static constexpr SkScalar kGridCellWidth = kTexSize + 20.0f + kNumBooleanParams * kLabelSize; |
| 261 | |
| 262 | sk_sp<SkShader> fOpaqueDiffuse; |
| 263 | sk_sp<SkShader> fTranslucentDiffuse; |
| 264 | sk_sp<SkShader> fNormalMapShader; |
| 265 | |
| 266 | const SkRect fRect; |
| 267 | sk_sp<SkLights> fLights; |
| 268 | sk_sp<SkLights> fLightsNoDir; |
| 269 | sk_sp<SkLights> fLightsTwoDir; |
| 270 | |
| 271 | typedef GM INHERITED; |
| 272 | }; |
| 273 | |
| 274 | ////////////////////////////////////////////////////////////////////////////// |
| 275 | |
| 276 | DEF_GM(return new LightingShader2GM;) |
| 277 | } |