OpenGLRenderer.cpp revision c0ac193b9415680f0a69e20a3f5f22d16f8053be
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define LOG_TAG "OpenGLRenderer" 18 19#include <stdlib.h> 20#include <stdint.h> 21#include <sys/types.h> 22 23#include <SkCanvas.h> 24 25#include <cutils/properties.h> 26#include <utils/Log.h> 27 28#include "OpenGLRenderer.h" 29 30namespace android { 31namespace uirenderer { 32 33/////////////////////////////////////////////////////////////////////////////// 34// Defines 35/////////////////////////////////////////////////////////////////////////////// 36 37// These properties are defined in mega-bytes 38#define PROPERTY_TEXTURE_CACHE_SIZE "ro.hwui.texture_cache_size" 39#define PROPERTY_LAYER_CACHE_SIZE "ro.hwui.layer_cache_size" 40#define PROPERTY_GRADIENT_CACHE_SIZE "ro.hwui.gradient_cache_size" 41 42#define DEFAULT_TEXTURE_CACHE_SIZE 20.0f 43#define DEFAULT_LAYER_CACHE_SIZE 10.0f 44#define DEFAULT_PATCH_CACHE_SIZE 100 45#define DEFAULT_GRADIENT_CACHE_SIZE 0.5f 46 47// Converts a number of mega-bytes into bytes 48#define MB(s) s * 1024 * 1024 49 50// Generates simple and textured vertices 51#define SV(x, y) { { x, y } } 52#define FV(x, y, u, v) { { x, y }, { u, v } } 53 54/////////////////////////////////////////////////////////////////////////////// 55// Globals 56/////////////////////////////////////////////////////////////////////////////// 57 58static const SimpleVertex gDrawColorVertices[] = { 59 SV(0.0f, 0.0f), 60 SV(1.0f, 0.0f), 61 SV(0.0f, 1.0f), 62 SV(1.0f, 1.0f) 63}; 64static const GLsizei gDrawColorVertexStride = sizeof(SimpleVertex); 65static const GLsizei gDrawColorVertexCount = 4; 66 67// This array is never used directly but used as a memcpy source in the 68// OpenGLRenderer constructor 69static const TextureVertex gDrawTextureVertices[] = { 70 FV(0.0f, 0.0f, 0.0f, 0.0f), 71 FV(1.0f, 0.0f, 1.0f, 0.0f), 72 FV(0.0f, 1.0f, 0.0f, 1.0f), 73 FV(1.0f, 1.0f, 1.0f, 1.0f) 74}; 75static const GLsizei gDrawTextureVertexStride = sizeof(TextureVertex); 76static const GLsizei gDrawTextureVertexCount = 4; 77 78// In this array, the index of each Blender equals the value of the first 79// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 80static const Blender gBlends[] = { 81 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 82 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 83 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 84 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 85 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 86 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 87 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 88 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 89 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 90 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 91 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 92 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 93}; 94 95static const GLint gTileModes[] = { 96 GL_CLAMP_TO_EDGE, // == SkShader::kClamp_TileMode 97 GL_REPEAT, // == SkShader::kRepeat_Mode 98 GL_MIRRORED_REPEAT // == SkShader::kMirror_TileMode 99}; 100 101/////////////////////////////////////////////////////////////////////////////// 102// Constructors/destructor 103/////////////////////////////////////////////////////////////////////////////// 104 105OpenGLRenderer::OpenGLRenderer(): 106 mBlend(false), mLastSrcMode(GL_ZERO), mLastDstMode(GL_ZERO), 107 mTextureCache(MB(DEFAULT_TEXTURE_CACHE_SIZE)), 108 mLayerCache(MB(DEFAULT_LAYER_CACHE_SIZE)), 109 mGradientCache(MB(DEFAULT_GRADIENT_CACHE_SIZE)), 110 mPatchCache(DEFAULT_PATCH_CACHE_SIZE) { 111 LOGD("Create OpenGLRenderer"); 112 113 char property[PROPERTY_VALUE_MAX]; 114 if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) { 115 LOGD(" Setting texture cache size to %sMB", property); 116 mTextureCache.setMaxSize(MB(atof(property))); 117 } else { 118 LOGD(" Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE); 119 } 120 121 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 122 LOGD(" Setting layer cache size to %sMB", property); 123 mLayerCache.setMaxSize(MB(atof(property))); 124 } else { 125 LOGD(" Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE); 126 } 127 128 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 129 LOGD(" Setting gradient cache size to %sMB", property); 130 mLayerCache.setMaxSize(MB(atof(property))); 131 } else { 132 LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 133 } 134 135 mDrawColorProgram = new DrawColorProgram; 136 mDrawTextureProgram = new DrawTextureProgram; 137 mDrawLinearGradientProgram = new DrawLinearGradientProgram; 138 mCurrentProgram = mDrawTextureProgram; 139 140 mShader = kShaderNone; 141 mShaderTileX = SkShader::kClamp_TileMode; 142 mShaderTileY = SkShader::kClamp_TileMode; 143 mShaderMatrix = NULL; 144 mShaderBitmap = NULL; 145 146 mLastTexture = 0; 147 148 memcpy(mDrawTextureVertices, gDrawTextureVertices, sizeof(gDrawTextureVertices)); 149} 150 151OpenGLRenderer::~OpenGLRenderer() { 152 LOGD("Destroy OpenGLRenderer"); 153 154 mTextureCache.clear(); 155 mLayerCache.clear(); 156 mGradientCache.clear(); 157 mPatchCache.clear(); 158} 159 160/////////////////////////////////////////////////////////////////////////////// 161// Setup 162/////////////////////////////////////////////////////////////////////////////// 163 164void OpenGLRenderer::setViewport(int width, int height) { 165 glViewport(0, 0, width, height); 166 167 mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1); 168 169 mWidth = width; 170 mHeight = height; 171 mFirstSnapshot.height = height; 172} 173 174void OpenGLRenderer::prepare() { 175 mSnapshot = &mFirstSnapshot; 176 mSaveCount = 0; 177 178 glDisable(GL_SCISSOR_TEST); 179 180 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 181 glClear(GL_COLOR_BUFFER_BIT); 182 183 glEnable(GL_SCISSOR_TEST); 184 glScissor(0, 0, mWidth, mHeight); 185 186 mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight); 187} 188 189/////////////////////////////////////////////////////////////////////////////// 190// State management 191/////////////////////////////////////////////////////////////////////////////// 192 193int OpenGLRenderer::getSaveCount() const { 194 return mSaveCount; 195} 196 197int OpenGLRenderer::save(int flags) { 198 return saveSnapshot(); 199} 200 201void OpenGLRenderer::restore() { 202 if (mSaveCount == 0) return; 203 204 if (restoreSnapshot()) { 205 setScissorFromClip(); 206 } 207} 208 209void OpenGLRenderer::restoreToCount(int saveCount) { 210 if (saveCount <= 0 || saveCount > mSaveCount) return; 211 212 bool restoreClip = false; 213 214 while (mSaveCount != saveCount - 1) { 215 restoreClip |= restoreSnapshot(); 216 } 217 218 if (restoreClip) { 219 setScissorFromClip(); 220 } 221} 222 223int OpenGLRenderer::saveSnapshot() { 224 mSnapshot = new Snapshot(mSnapshot); 225 return ++mSaveCount; 226} 227 228bool OpenGLRenderer::restoreSnapshot() { 229 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 230 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 231 bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho; 232 233 sp<Snapshot> current = mSnapshot; 234 sp<Snapshot> previous = mSnapshot->previous; 235 236 if (restoreOrtho) { 237 mOrthoMatrix.load(current->orthoMatrix); 238 } 239 240 if (restoreLayer) { 241 composeLayer(current, previous); 242 } 243 244 mSnapshot = previous; 245 mSaveCount--; 246 247 return restoreClip; 248} 249 250void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 251 if (!current->layer) { 252 LOGE("Attempting to compose a layer that does not exist"); 253 return; 254 } 255 256 // Unbind current FBO and restore previous one 257 // Most of the time, previous->fbo will be 0 to bind the default buffer 258 glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo); 259 260 // Restore the clip from the previous snapshot 261 const Rect& clip = previous->clipRect; 262 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 263 264 Layer* layer = current->layer; 265 266 // Compute the correct texture coordinates for the FBO texture 267 // The texture is currently as big as the window but drawn with 268 // a quad of the appropriate size 269 const Rect& rect = layer->layer; 270 271 drawTextureRect(rect.left, rect.top, rect.right, rect.bottom, 272 layer->texture, layer->alpha, layer->mode, layer->blend); 273 274 LayerSize size(rect.getWidth(), rect.getHeight()); 275 // Failing to add the layer to the cache should happen only if the 276 // layer is too large 277 if (!mLayerCache.put(size, layer)) { 278 LAYER_LOGD("Deleting layer"); 279 280 glDeleteFramebuffers(1, &layer->fbo); 281 glDeleteTextures(1, &layer->texture); 282 283 delete layer; 284 } 285} 286 287/////////////////////////////////////////////////////////////////////////////// 288// Layers 289/////////////////////////////////////////////////////////////////////////////// 290 291int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 292 const SkPaint* p, int flags) { 293 int count = saveSnapshot(); 294 295 int alpha = 255; 296 SkXfermode::Mode mode; 297 298 if (p) { 299 alpha = p->getAlpha(); 300 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 301 if (!isMode) { 302 // Assume SRC_OVER 303 mode = SkXfermode::kSrcOver_Mode; 304 } 305 } else { 306 mode = SkXfermode::kSrcOver_Mode; 307 } 308 309 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 310 311 return count; 312} 313 314int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 315 int alpha, int flags) { 316 int count = saveSnapshot(); 317 createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 318 return count; 319} 320 321bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 322 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 323 324 LAYER_LOGD("Requesting layer %fx%f", right - left, bottom - top); 325 LAYER_LOGD("Layer cache size = %d", mLayerCache.getSize()); 326 327 GLuint previousFbo = snapshot->previous.get() ? snapshot->previous->fbo : 0; 328 LayerSize size(right - left, bottom - top); 329 330 Layer* layer = mLayerCache.get(size, previousFbo); 331 if (!layer) { 332 return false; 333 } 334 335 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 336 337 // Clear the FBO 338 glDisable(GL_SCISSOR_TEST); 339 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 340 glClear(GL_COLOR_BUFFER_BIT); 341 glEnable(GL_SCISSOR_TEST); 342 343 // Save the layer in the snapshot 344 snapshot->flags |= Snapshot::kFlagIsLayer; 345 layer->mode = mode; 346 layer->alpha = alpha / 255.0f; 347 layer->layer.set(left, top, right, bottom); 348 349 snapshot->layer = layer; 350 snapshot->fbo = layer->fbo; 351 352 // Creates a new snapshot to draw into the FBO 353 saveSnapshot(); 354 // TODO: This doesn't preserve other transformations (check Skia first) 355 mSnapshot->transform.loadTranslate(-left, -top, 0.0f); 356 mSnapshot->setClip(0.0f, 0.0f, right - left, bottom - top); 357 mSnapshot->height = bottom - top; 358 setScissorFromClip(); 359 360 mSnapshot->flags = Snapshot::kFlagDirtyOrtho | Snapshot::kFlagClipSet; 361 mSnapshot->orthoMatrix.load(mOrthoMatrix); 362 363 // Change the ortho projection 364 mOrthoMatrix.loadOrtho(0.0f, right - left, bottom - top, 0.0f, 0.0f, 1.0f); 365 366 return true; 367} 368 369/////////////////////////////////////////////////////////////////////////////// 370// Transforms 371/////////////////////////////////////////////////////////////////////////////// 372 373void OpenGLRenderer::translate(float dx, float dy) { 374 mSnapshot->transform.translate(dx, dy, 0.0f); 375} 376 377void OpenGLRenderer::rotate(float degrees) { 378 mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f); 379} 380 381void OpenGLRenderer::scale(float sx, float sy) { 382 mSnapshot->transform.scale(sx, sy, 1.0f); 383} 384 385void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 386 mSnapshot->transform.load(*matrix); 387} 388 389void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 390 mSnapshot->transform.copyTo(*matrix); 391} 392 393void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 394 mat4 m(*matrix); 395 mSnapshot->transform.multiply(m); 396} 397 398/////////////////////////////////////////////////////////////////////////////// 399// Clipping 400/////////////////////////////////////////////////////////////////////////////// 401 402void OpenGLRenderer::setScissorFromClip() { 403 const Rect& clip = mSnapshot->clipRect; 404 glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight()); 405} 406 407const Rect& OpenGLRenderer::getClipBounds() { 408 return mSnapshot->getLocalClip(); 409} 410 411bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 412 Rect r(left, top, right, bottom); 413 mSnapshot->transform.mapRect(r); 414 return !mSnapshot->clipRect.intersects(r); 415} 416 417bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 418 bool clipped = mSnapshot->clip(left, top, right, bottom, op); 419 if (clipped) { 420 setScissorFromClip(); 421 } 422 return !mSnapshot->clipRect.isEmpty(); 423} 424 425/////////////////////////////////////////////////////////////////////////////// 426// Drawing 427/////////////////////////////////////////////////////////////////////////////// 428 429void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 430 const float right = left + bitmap->width(); 431 const float bottom = top + bitmap->height(); 432 433 if (quickReject(left, top, right, bottom)) { 434 return; 435 } 436 437 const Texture* texture = mTextureCache.get(bitmap); 438 drawTextureRect(left, top, right, bottom, texture, paint); 439} 440 441void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 442 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 443 const mat4 transform(*matrix); 444 transform.mapRect(r); 445 446 if (quickReject(r.left, r.top, r.right, r.bottom)) { 447 return; 448 } 449 450 const Texture* texture = mTextureCache.get(bitmap); 451 drawTextureRect(r.left, r.top, r.right, r.bottom, texture, paint); 452} 453 454void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 455 float srcLeft, float srcTop, float srcRight, float srcBottom, 456 float dstLeft, float dstTop, float dstRight, float dstBottom, 457 const SkPaint* paint) { 458 if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) { 459 return; 460 } 461 462 const Texture* texture = mTextureCache.get(bitmap); 463 464 const float width = texture->width; 465 const float height = texture->height; 466 467 const float u1 = srcLeft / width; 468 const float v1 = srcTop / height; 469 const float u2 = srcRight / width; 470 const float v2 = srcBottom / height; 471 472 resetDrawTextureTexCoords(u1, v1, u2, v2); 473 474 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture, paint); 475 476 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 477} 478 479void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, 480 float left, float top, float right, float bottom, const SkPaint* paint) { 481 if (quickReject(left, top, right, bottom)) { 482 return; 483 } 484 485 const Texture* texture = mTextureCache.get(bitmap); 486 487 int alpha; 488 SkXfermode::Mode mode; 489 getAlphaAndMode(paint, &alpha, &mode); 490 491 Patch* mesh = mPatchCache.get(patch); 492 mesh->updateVertices(bitmap, left, top, right, bottom, 493 &patch->xDivs[0], &patch->yDivs[0], patch->numXDivs, patch->numYDivs); 494 495 // Specify right and bottom as +1.0f from left/top to prevent scaling since the 496 // patch mesh already defines the final size 497 drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha / 255.0f, 498 mode, texture->blend, &mesh->vertices[0].position[0], 499 &mesh->vertices[0].texture[0], mesh->indices, mesh->indicesCount); 500} 501 502void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 503 const Rect& clip = mSnapshot->clipRect; 504 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true); 505} 506 507void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 508 if (quickReject(left, top, right, bottom)) { 509 return; 510 } 511 512 SkXfermode::Mode mode; 513 514 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 515 if (!isMode) { 516 // Assume SRC_OVER 517 mode = SkXfermode::kSrcOver_Mode; 518 } 519 520 // Skia draws using the color's alpha channel if < 255 521 // Otherwise, it uses the paint's alpha 522 int color = p->getColor(); 523 if (((color >> 24) & 0xff) == 255) { 524 color |= p->getAlpha() << 24; 525 } 526 527 drawColorRect(left, top, right, bottom, color, mode); 528} 529 530/////////////////////////////////////////////////////////////////////////////// 531// Shaders 532/////////////////////////////////////////////////////////////////////////////// 533 534void OpenGLRenderer::resetShader() { 535 mShader = OpenGLRenderer::kShaderNone; 536 mShaderKey = NULL; 537 mShaderBlend = false; 538 mShaderTileX = SkShader::kClamp_TileMode; 539 mShaderTileY = SkShader::kClamp_TileMode; 540} 541 542void OpenGLRenderer::setupBitmapShader(SkBitmap* bitmap, SkShader::TileMode tileX, 543 SkShader::TileMode tileY, SkMatrix* matrix, bool hasAlpha) { 544 mShader = OpenGLRenderer::kShaderBitmap; 545 mShaderBlend = hasAlpha; 546 mShaderBitmap = bitmap; 547 mShaderTileX = tileX; 548 mShaderTileY = tileY; 549 mShaderMatrix = matrix; 550} 551 552void OpenGLRenderer::setupLinearGradientShader(SkShader* shader, float* bounds, uint32_t* colors, 553 float* positions, int count, SkShader::TileMode tileMode, SkMatrix* matrix, 554 bool hasAlpha) { 555 // TODO: We should use a struct to describe each shader 556 mShader = OpenGLRenderer::kShaderLinearGradient; 557 mShaderKey = shader; 558 mShaderBlend = hasAlpha; 559 mShaderTileX = tileMode; 560 mShaderTileY = tileMode; 561 mShaderMatrix = matrix; 562 mShaderBounds = bounds; 563 mShaderColors = colors; 564 mShaderPositions = positions; 565 mShaderCount = count; 566} 567 568/////////////////////////////////////////////////////////////////////////////// 569// Drawing implementation 570/////////////////////////////////////////////////////////////////////////////// 571 572void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 573 int color, SkXfermode::Mode mode, bool ignoreTransform) { 574 // If a shader is set, preserve only the alpha 575 if (mShader != kShaderNone) { 576 color |= 0x00ffffff; 577 } 578 579 // Render using pre-multiplied alpha 580 const int alpha = (color >> 24) & 0xFF; 581 const GLfloat a = alpha / 255.0f; 582 583 switch (mShader) { 584 case OpenGLRenderer::kShaderBitmap: 585 drawBitmapShader(left, top, right, bottom, a, mode); 586 return; 587 case OpenGLRenderer::kShaderLinearGradient: 588 drawLinearGradientShader(left, top, right, bottom, a, mode); 589 return; 590 default: 591 break; 592 } 593 594 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 595 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 596 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 597 598 // Pre-multiplication happens when setting the shader color 599 chooseBlending(alpha < 255 || mShaderBlend, mode); 600 601 mModelView.loadTranslate(left, top, 0.0f); 602 mModelView.scale(right - left, bottom - top, 1.0f); 603 604 if (!useProgram(mDrawColorProgram)) { 605 const GLvoid* p = &gDrawColorVertices[0].position[0]; 606 glVertexAttribPointer(mDrawColorProgram->position, 2, GL_FLOAT, GL_FALSE, 607 gDrawColorVertexStride, p); 608 } 609 610 if (!ignoreTransform) { 611 mDrawColorProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 612 } else { 613 mat4 identity; 614 mDrawColorProgram->set(mOrthoMatrix, mModelView, identity); 615 } 616 617 glUniform4f(mDrawColorProgram->color, r, g, b, a); 618 619 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawColorVertexCount); 620} 621 622void OpenGLRenderer::drawLinearGradientShader(float left, float top, float right, float bottom, 623 float alpha, SkXfermode::Mode mode) { 624 Texture* texture = mGradientCache.get(mShaderKey); 625 if (!texture) { 626 texture = mGradientCache.addLinearGradient(mShaderKey, mShaderBounds, mShaderColors, 627 mShaderPositions, mShaderCount, mShaderTileX); 628 } 629 630 mModelView.loadTranslate(left, top, 0.0f); 631 mModelView.scale(right - left, bottom - top, 1.0f); 632 633 useProgram(mDrawLinearGradientProgram); 634 mDrawLinearGradientProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 635 636 chooseBlending(mShaderBlend || alpha < 1.0f, mode); 637 638 if (texture->id != mLastTexture) { 639 glBindTexture(GL_TEXTURE_2D, texture->id); 640 mLastTexture = texture->id; 641 } 642 // TODO: Don't set the texture parameters every time 643 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, gTileModes[mShaderTileX]); 644 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, gTileModes[mShaderTileX]); 645 646 Rect start(mShaderBounds[0], mShaderBounds[1], mShaderBounds[2], mShaderBounds[3]); 647 if (mShaderMatrix) { 648 mat4 shaderMatrix(*mShaderMatrix); 649 shaderMatrix.mapRect(start); 650 } 651 mSnapshot->transform.mapRect(start); 652 653 const float gradientX = start.right - start.left; 654 const float gradientY = start.bottom - start.top; 655 656 mat4 screenSpace(mSnapshot->transform); 657 screenSpace.multiply(mModelView); 658 659 // Always premultiplied 660 glUniform4f(mDrawLinearGradientProgram->color, alpha, alpha, alpha, alpha); 661 glUniform2f(mDrawLinearGradientProgram->start, start.left, start.top); 662 glUniform2f(mDrawLinearGradientProgram->gradient, gradientX, gradientY); 663 glUniform1f(mDrawLinearGradientProgram->gradientLength, 664 1.0f / (gradientX * gradientX + gradientY * gradientY)); 665 glUniformMatrix4fv(mDrawLinearGradientProgram->screenSpace, 1, GL_FALSE, 666 &screenSpace.data[0]); 667 668 glVertexAttribPointer(mDrawLinearGradientProgram->position, 2, GL_FLOAT, GL_FALSE, 669 gDrawTextureVertexStride, &mDrawTextureVertices[0].position[0]); 670 671 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawTextureVertexCount); 672} 673 674void OpenGLRenderer::drawBitmapShader(float left, float top, float right, float bottom, 675 float alpha, SkXfermode::Mode mode) { 676 const Texture* texture = mTextureCache.get(mShaderBitmap); 677 678 const float width = texture->width; 679 const float height = texture->height; 680 681 // This could be done in the vertex shader but we have only 4 vertices 682 float u1 = 0.0f; 683 float v1 = 0.0f; 684 float u2 = right - left; 685 float v2 = bottom - top; 686 687 if (mShaderMatrix) { 688 SkMatrix inverse; 689 mShaderMatrix->invert(&inverse); 690 mat4 m(inverse); 691 Rect r(u1, v1, u2, v2); 692 m.mapRect(r); 693 694 u1 = r.left; 695 u2 = r.right; 696 v1 = r.top; 697 v2 = r.bottom; 698 } 699 700 u1 /= width; 701 u2 /= width; 702 v1 /= height; 703 v2 /= height; 704 705 resetDrawTextureTexCoords(u1, v1, u2, v2); 706 707 drawTextureMesh(left, top, right, bottom, texture->id, alpha, mode, texture->blend, 708 &mDrawTextureVertices[0].position[0], &mDrawTextureVertices[0].texture[0], NULL); 709 710 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 711} 712 713void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 714 const Texture* texture, const SkPaint* paint) { 715 int alpha; 716 SkXfermode::Mode mode; 717 getAlphaAndMode(paint, &alpha, &mode); 718 719 drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode, texture->blend, 720 &mDrawTextureVertices[0].position[0], &mDrawTextureVertices[0].texture[0], NULL); 721} 722 723void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 724 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) { 725 drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend, 726 &mDrawTextureVertices[0].position[0], &mDrawTextureVertices[0].texture[0], NULL); 727} 728 729void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom, 730 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, 731 GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount) { 732 mModelView.loadTranslate(left, top, 0.0f); 733 mModelView.scale(right - left, bottom - top, 1.0f); 734 735 useProgram(mDrawTextureProgram); 736 mDrawTextureProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 737 738 chooseBlending(blend || alpha < 1.0f, mode); 739 740 if (texture != mLastTexture) { 741 glBindTexture(GL_TEXTURE_2D, texture); 742 mLastTexture = texture; 743 } 744 // TODO: Don't set the texture parameters every time 745 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, gTileModes[mShaderTileX]); 746 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, gTileModes[mShaderTileY]); 747 748 // Always premultiplied 749 //glUniform4f(mDrawTextureProgram->color, alpha, alpha, alpha, alpha); 750 glUniform4f(mDrawTextureProgram->color, alpha, alpha, alpha, alpha); 751 752 glVertexAttribPointer(mDrawTextureProgram->position, 2, GL_FLOAT, GL_FALSE, 753 gDrawTextureVertexStride, vertices); 754 glVertexAttribPointer(mDrawTextureProgram->texCoords, 2, GL_FLOAT, GL_FALSE, 755 gDrawTextureVertexStride, texCoords); 756 757 if (!indices) { 758 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawTextureVertexCount); 759 } else { 760 glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices); 761 } 762} 763 764void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode, bool isPremultiplied) { 765 // In theory we should not blend if the mode is Src, but it's rare enough 766 // that it's not worth it 767 blend = blend || mode != SkXfermode::kSrcOver_Mode; 768 if (blend) { 769 if (!mBlend) { 770 glEnable(GL_BLEND); 771 } 772 773 GLenum sourceMode = gBlends[mode].src; 774 GLenum destMode = gBlends[mode].dst; 775 if (!isPremultiplied && sourceMode == GL_ONE) { 776 sourceMode = GL_SRC_ALPHA; 777 } 778 779 if (sourceMode != mLastSrcMode || destMode != mLastDstMode) { 780 glBlendFunc(sourceMode, destMode); 781 mLastSrcMode = sourceMode; 782 mLastDstMode = destMode; 783 } 784 } else if (mBlend) { 785 glDisable(GL_BLEND); 786 } 787 mBlend = blend; 788} 789 790bool OpenGLRenderer::useProgram(const sp<Program>& program) { 791 if (!program->isInUse()) { 792 mCurrentProgram->remove(); 793 program->use(); 794 mCurrentProgram = program; 795 return false; 796 } 797 return true; 798} 799 800void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 801 TextureVertex* v = &mDrawTextureVertices[0]; 802 TextureVertex::setUV(v++, u1, v1); 803 TextureVertex::setUV(v++, u2, v1); 804 TextureVertex::setUV(v++, u1, v2); 805 TextureVertex::setUV(v++, u2, v2); 806} 807 808void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 809 if (paint) { 810 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 811 if (!isMode) { 812 // Assume SRC_OVER 813 *mode = SkXfermode::kSrcOver_Mode; 814 } 815 816 // Skia draws using the color's alpha channel if < 255 817 // Otherwise, it uses the paint's alpha 818 int color = paint->getColor(); 819 *alpha = (color >> 24) & 0xFF; 820 if (*alpha == 255) { 821 *alpha = paint->getAlpha(); 822 } 823 } else { 824 *mode = SkXfermode::kSrcOver_Mode; 825 *alpha = 255; 826 } 827} 828 829}; // namespace uirenderer 830}; // namespace android 831