OpenGLRenderer.cpp revision db1938e0e6ef816e228c815adccebd5cb05f2aa8
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#include <SkTypeface.h> 25 26#include <cutils/properties.h> 27#include <utils/Log.h> 28 29#include "OpenGLRenderer.h" 30#include "Properties.h" 31 32namespace android { 33namespace uirenderer { 34 35/////////////////////////////////////////////////////////////////////////////// 36// Defines 37/////////////////////////////////////////////////////////////////////////////// 38 39#define DEFAULT_TEXTURE_CACHE_SIZE 20.0f 40#define DEFAULT_LAYER_CACHE_SIZE 10.0f 41#define DEFAULT_PATCH_CACHE_SIZE 100 42#define DEFAULT_GRADIENT_CACHE_SIZE 0.5f 43 44#define REQUIRED_TEXTURE_UNITS_COUNT 3 45 46// Converts a number of mega-bytes into bytes 47#define MB(s) s * 1024 * 1024 48 49// Generates simple and textured vertices 50#define FV(x, y, u, v) { { x, y }, { u, v } } 51 52/////////////////////////////////////////////////////////////////////////////// 53// Globals 54/////////////////////////////////////////////////////////////////////////////// 55 56// This array is never used directly but used as a memcpy source in the 57// OpenGLRenderer constructor 58static const TextureVertex gMeshVertices[] = { 59 FV(0.0f, 0.0f, 0.0f, 0.0f), 60 FV(1.0f, 0.0f, 1.0f, 0.0f), 61 FV(0.0f, 1.0f, 0.0f, 1.0f), 62 FV(1.0f, 1.0f, 1.0f, 1.0f) 63}; 64static const GLsizei gMeshStride = sizeof(TextureVertex); 65static const GLsizei gMeshCount = 4; 66 67/** 68 * Structure mapping Skia xfermodes to OpenGL blending factors. 69 */ 70struct Blender { 71 SkXfermode::Mode mode; 72 GLenum src; 73 GLenum dst; 74}; // struct Blender 75 76// In this array, the index of each Blender equals the value of the first 77// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 78static const Blender gBlends[] = { 79 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 80 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 81 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 82 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 83 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 84 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 85 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 86 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 87 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 88 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 89 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 90 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 91}; 92 93static const GLenum gTextureUnits[] = { 94 GL_TEXTURE0, 95 GL_TEXTURE1, 96 GL_TEXTURE2 97}; 98 99/////////////////////////////////////////////////////////////////////////////// 100// Constructors/destructor 101/////////////////////////////////////////////////////////////////////////////// 102 103OpenGLRenderer::OpenGLRenderer(): 104 mBlend(false), mLastSrcMode(GL_ZERO), mLastDstMode(GL_ZERO), 105 mTextureCache(MB(DEFAULT_TEXTURE_CACHE_SIZE)), 106 mLayerCache(MB(DEFAULT_LAYER_CACHE_SIZE)), 107 mGradientCache(MB(DEFAULT_GRADIENT_CACHE_SIZE)), 108 mPatchCache(DEFAULT_PATCH_CACHE_SIZE) { 109 LOGD("Create OpenGLRenderer"); 110 111 char property[PROPERTY_VALUE_MAX]; 112 if (property_get(PROPERTY_TEXTURE_CACHE_SIZE, property, NULL) > 0) { 113 LOGD(" Setting texture cache size to %sMB", property); 114 mTextureCache.setMaxSize(MB(atof(property))); 115 } else { 116 LOGD(" Using default texture cache size of %.2fMB", DEFAULT_TEXTURE_CACHE_SIZE); 117 } 118 119 if (property_get(PROPERTY_LAYER_CACHE_SIZE, property, NULL) > 0) { 120 LOGD(" Setting layer cache size to %sMB", property); 121 mLayerCache.setMaxSize(MB(atof(property))); 122 } else { 123 LOGD(" Using default layer cache size of %.2fMB", DEFAULT_LAYER_CACHE_SIZE); 124 } 125 126 if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) { 127 LOGD(" Setting gradient cache size to %sMB", property); 128 mLayerCache.setMaxSize(MB(atof(property))); 129 } else { 130 LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE); 131 } 132 133 mCurrentProgram = NULL; 134 mShader = NULL; 135 mColorFilter = NULL; 136 137 memcpy(mMeshVertices, gMeshVertices, sizeof(gMeshVertices)); 138 139 mFirstSnapshot = new Snapshot; 140 141 GLint maxTextureUnits; 142 glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxTextureUnits); 143 if (maxTextureUnits < REQUIRED_TEXTURE_UNITS_COUNT) { 144 LOGW("At least %d texture units are required!", REQUIRED_TEXTURE_UNITS_COUNT); 145 } 146} 147 148OpenGLRenderer::~OpenGLRenderer() { 149 LOGD("Destroy OpenGLRenderer"); 150 151 mTextureCache.clear(); 152 mLayerCache.clear(); 153 mGradientCache.clear(); 154 mPatchCache.clear(); 155} 156 157/////////////////////////////////////////////////////////////////////////////// 158// Setup 159/////////////////////////////////////////////////////////////////////////////// 160 161void OpenGLRenderer::setViewport(int width, int height) { 162 glViewport(0, 0, width, height); 163 164 mOrthoMatrix.loadOrtho(0, width, height, 0, -1, 1); 165 166 mWidth = width; 167 mHeight = height; 168 mFirstSnapshot->height = height; 169} 170 171void OpenGLRenderer::prepare() { 172 mSnapshot = new Snapshot(mFirstSnapshot); 173 mSaveCount = 0; 174 175 glDisable(GL_SCISSOR_TEST); 176 177 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 178 glClear(GL_COLOR_BUFFER_BIT); 179 180 glEnable(GL_SCISSOR_TEST); 181 glScissor(0, 0, mWidth, mHeight); 182 183 mSnapshot->setClip(0.0f, 0.0f, mWidth, mHeight); 184} 185 186/////////////////////////////////////////////////////////////////////////////// 187// State management 188/////////////////////////////////////////////////////////////////////////////// 189 190int OpenGLRenderer::getSaveCount() const { 191 return mSaveCount; 192} 193 194int OpenGLRenderer::save(int flags) { 195 return saveSnapshot(); 196} 197 198void OpenGLRenderer::restore() { 199 if (mSaveCount == 0) return; 200 201 if (restoreSnapshot()) { 202 setScissorFromClip(); 203 } 204} 205 206void OpenGLRenderer::restoreToCount(int saveCount) { 207 if (saveCount <= 0 || saveCount > mSaveCount) return; 208 209 bool restoreClip = false; 210 211 while (mSaveCount != saveCount - 1) { 212 restoreClip |= restoreSnapshot(); 213 } 214 215 if (restoreClip) { 216 setScissorFromClip(); 217 } 218} 219 220int OpenGLRenderer::saveSnapshot() { 221 mSnapshot = new Snapshot(mSnapshot); 222 return ++mSaveCount; 223} 224 225bool OpenGLRenderer::restoreSnapshot() { 226 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 227 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 228 bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho; 229 230 sp<Snapshot> current = mSnapshot; 231 sp<Snapshot> previous = mSnapshot->previous; 232 233 if (restoreOrtho) { 234 mOrthoMatrix.load(current->orthoMatrix); 235 } 236 237 if (restoreLayer) { 238 composeLayer(current, previous); 239 } 240 241 mSnapshot = previous; 242 mSaveCount--; 243 244 return restoreClip; 245} 246 247void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 248 if (!current->layer) { 249 LOGE("Attempting to compose a layer that does not exist"); 250 return; 251 } 252 253 // Unbind current FBO and restore previous one 254 // Most of the time, previous->fbo will be 0 to bind the default buffer 255 glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo); 256 257 // Restore the clip from the previous snapshot 258 const Rect& clip = previous->clipRect; 259 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 260 261 Layer* layer = current->layer; 262 const Rect& rect = layer->layer; 263 264 drawTextureRect(rect.left, rect.top, rect.right, rect.bottom, 265 layer->texture, layer->alpha, layer->mode, layer->blend); 266 267 LayerSize size(rect.getWidth(), rect.getHeight()); 268 // Failing to add the layer to the cache should happen only if the 269 // layer is too large 270 if (!mLayerCache.put(size, layer)) { 271 LAYER_LOGD("Deleting layer"); 272 273 glDeleteFramebuffers(1, &layer->fbo); 274 glDeleteTextures(1, &layer->texture); 275 276 delete layer; 277 } 278} 279 280/////////////////////////////////////////////////////////////////////////////// 281// Layers 282/////////////////////////////////////////////////////////////////////////////// 283 284int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 285 const SkPaint* p, int flags) { 286 int count = saveSnapshot(); 287 288 int alpha = 255; 289 SkXfermode::Mode mode; 290 291 if (p) { 292 alpha = p->getAlpha(); 293 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 294 if (!isMode) { 295 // Assume SRC_OVER 296 mode = SkXfermode::kSrcOver_Mode; 297 } 298 } else { 299 mode = SkXfermode::kSrcOver_Mode; 300 } 301 302 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 303 304 return count; 305} 306 307int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 308 int alpha, int flags) { 309 int count = saveSnapshot(); 310 createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 311 return count; 312} 313 314bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 315 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 316 LAYER_LOGD("Requesting layer %fx%f", right - left, bottom - top); 317 LAYER_LOGD("Layer cache size = %d", mLayerCache.getSize()); 318 319 GLuint previousFbo = snapshot->previous.get() ? snapshot->previous->fbo : 0; 320 LayerSize size(right - left, bottom - top); 321 322 Layer* layer = mLayerCache.get(size, previousFbo); 323 if (!layer) { 324 return false; 325 } 326 327 glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo); 328 329 // Clear the FBO 330 glDisable(GL_SCISSOR_TEST); 331 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 332 glClear(GL_COLOR_BUFFER_BIT); 333 glEnable(GL_SCISSOR_TEST); 334 335 // Save the layer in the snapshot 336 snapshot->flags |= Snapshot::kFlagIsLayer; 337 layer->mode = mode; 338 layer->alpha = alpha / 255.0f; 339 layer->layer.set(left, top, right, bottom); 340 341 snapshot->layer = layer; 342 snapshot->fbo = layer->fbo; 343 344 // Creates a new snapshot to draw into the FBO 345 saveSnapshot(); 346 // TODO: This doesn't preserve other transformations (check Skia first) 347 mSnapshot->transform.loadTranslate(-left, -top, 0.0f); 348 mSnapshot->setClip(0.0f, 0.0f, right - left, bottom - top); 349 mSnapshot->height = bottom - top; 350 setScissorFromClip(); 351 352 mSnapshot->flags = Snapshot::kFlagDirtyOrtho | Snapshot::kFlagClipSet; 353 mSnapshot->orthoMatrix.load(mOrthoMatrix); 354 355 // Change the ortho projection 356 mOrthoMatrix.loadOrtho(0.0f, right - left, bottom - top, 0.0f, 0.0f, 1.0f); 357 358 return true; 359} 360 361/////////////////////////////////////////////////////////////////////////////// 362// Transforms 363/////////////////////////////////////////////////////////////////////////////// 364 365void OpenGLRenderer::translate(float dx, float dy) { 366 mSnapshot->transform.translate(dx, dy, 0.0f); 367} 368 369void OpenGLRenderer::rotate(float degrees) { 370 mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f); 371} 372 373void OpenGLRenderer::scale(float sx, float sy) { 374 mSnapshot->transform.scale(sx, sy, 1.0f); 375} 376 377void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 378 mSnapshot->transform.load(*matrix); 379} 380 381void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 382 mSnapshot->transform.copyTo(*matrix); 383} 384 385void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 386 mat4 m(*matrix); 387 mSnapshot->transform.multiply(m); 388} 389 390/////////////////////////////////////////////////////////////////////////////// 391// Clipping 392/////////////////////////////////////////////////////////////////////////////// 393 394void OpenGLRenderer::setScissorFromClip() { 395 const Rect& clip = mSnapshot->clipRect; 396 glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight()); 397} 398 399const Rect& OpenGLRenderer::getClipBounds() { 400 return mSnapshot->getLocalClip(); 401} 402 403bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 404 Rect r(left, top, right, bottom); 405 mSnapshot->transform.mapRect(r); 406 return !mSnapshot->clipRect.intersects(r); 407} 408 409bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom, SkRegion::Op op) { 410 bool clipped = mSnapshot->clip(left, top, right, bottom, op); 411 if (clipped) { 412 setScissorFromClip(); 413 } 414 return !mSnapshot->clipRect.isEmpty(); 415} 416 417/////////////////////////////////////////////////////////////////////////////// 418// Drawing 419/////////////////////////////////////////////////////////////////////////////// 420 421void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 422 const float right = left + bitmap->width(); 423 const float bottom = top + bitmap->height(); 424 425 if (quickReject(left, top, right, bottom)) { 426 return; 427 } 428 429 const Texture* texture = mTextureCache.get(bitmap); 430 drawTextureRect(left, top, right, bottom, texture, paint); 431} 432 433void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 434 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 435 const mat4 transform(*matrix); 436 transform.mapRect(r); 437 438 if (quickReject(r.left, r.top, r.right, r.bottom)) { 439 return; 440 } 441 442 const Texture* texture = mTextureCache.get(bitmap); 443 drawTextureRect(r.left, r.top, r.right, r.bottom, texture, paint); 444} 445 446void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 447 float srcLeft, float srcTop, float srcRight, float srcBottom, 448 float dstLeft, float dstTop, float dstRight, float dstBottom, 449 const SkPaint* paint) { 450 if (quickReject(dstLeft, dstTop, dstRight, dstBottom)) { 451 return; 452 } 453 454 const Texture* texture = mTextureCache.get(bitmap); 455 456 const float width = texture->width; 457 const float height = texture->height; 458 459 const float u1 = srcLeft / width; 460 const float v1 = srcTop / height; 461 const float u2 = srcRight / width; 462 const float v2 = srcBottom / height; 463 464 resetDrawTextureTexCoords(u1, v1, u2, v2); 465 466 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture, paint); 467 468 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 469} 470 471void OpenGLRenderer::drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, 472 float left, float top, float right, float bottom, const SkPaint* paint) { 473 if (quickReject(left, top, right, bottom)) { 474 return; 475 } 476 477 const Texture* texture = mTextureCache.get(bitmap); 478 479 int alpha; 480 SkXfermode::Mode mode; 481 getAlphaAndMode(paint, &alpha, &mode); 482 483 Patch* mesh = mPatchCache.get(patch); 484 mesh->updateVertices(bitmap, left, top, right, bottom, 485 &patch->xDivs[0], &patch->yDivs[0], patch->numXDivs, patch->numYDivs); 486 487 // Specify right and bottom as +1.0f from left/top to prevent scaling since the 488 // patch mesh already defines the final size 489 drawTextureMesh(left, top, left + 1.0f, top + 1.0f, texture->id, alpha / 255.0f, 490 mode, texture->blend, &mesh->vertices[0].position[0], 491 &mesh->vertices[0].texture[0], mesh->indices, mesh->indicesCount); 492} 493 494void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 495 const Rect& clip = mSnapshot->clipRect; 496 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode, true); 497} 498 499void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 500 if (quickReject(left, top, right, bottom)) { 501 return; 502 } 503 504 SkXfermode::Mode mode; 505 506 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 507 if (!isMode) { 508 // Assume SRC_OVER 509 mode = SkXfermode::kSrcOver_Mode; 510 } 511 512 // Skia draws using the color's alpha channel if < 255 513 // Otherwise, it uses the paint's alpha 514 int color = p->getColor(); 515 if (((color >> 24) & 0xff) == 255) { 516 color |= p->getAlpha() << 24; 517 } 518 519 drawColorRect(left, top, right, bottom, color, mode); 520} 521 522void OpenGLRenderer::drawText(const char* text, int bytesCount, int count, 523 float x, float y, SkPaint* paint) { 524 if (text == NULL || count == 0 || (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) { 525 return; 526 } 527 528 float length; 529 switch (paint->getTextAlign()) { 530 case SkPaint::kCenter_Align: 531 length = paint->measureText(text, bytesCount); 532 x -= length / 2.0f; 533 break; 534 case SkPaint::kRight_Align: 535 length = paint->measureText(text, bytesCount); 536 x -= length; 537 break; 538 default: 539 break; 540 } 541 542 int alpha; 543 SkXfermode::Mode mode; 544 getAlphaAndMode(paint, &alpha, &mode); 545 546 uint32_t color = paint->getColor(); 547 const GLfloat a = alpha / 255.0f; 548 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 549 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 550 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 551 552 mModelView.loadIdentity(); 553 554 GLuint textureUnit = 0; 555 // Needs to be set prior to calling FontRenderer::getTexture() 556 glActiveTexture(gTextureUnits[textureUnit]); 557 558 ProgramDescription description; 559 description.hasTexture = true; 560 description.hasAlpha8Texture = true; 561 if (mShader) { 562 mShader->describe(description, mExtensions); 563 } 564 if (mColorFilter) { 565 mColorFilter->describe(description, mExtensions); 566 } 567 568 useProgram(mProgramCache.get(description)); 569 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 570 571 // Text is always blended, no need to check the shader 572 chooseBlending(true, mode); 573 bindTexture(mFontRenderer.getTexture(), GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, textureUnit); 574 glUniform1i(mCurrentProgram->getUniform("sampler"), textureUnit); 575 576 int texCoordsSlot = mCurrentProgram->getAttrib("texCoords"); 577 glEnableVertexAttribArray(texCoordsSlot); 578 579 // Always premultiplied 580 glUniform4f(mCurrentProgram->color, r, g, b, a); 581 582 textureUnit++; 583 // Setup attributes and uniforms required by the shaders 584 if (mShader) { 585 mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit); 586 } 587 if (mColorFilter) { 588 mColorFilter->setupProgram(mCurrentProgram); 589 } 590 591 // TODO: Implement scale properly 592 const Rect& clip = mSnapshot->getLocalClip(); 593 mFontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()), paint->getTextSize()); 594 mFontRenderer.renderText(paint, &clip, text, 0, bytesCount, count, x, y); 595 596 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); 597 glDisableVertexAttribArray(texCoordsSlot); 598} 599 600/////////////////////////////////////////////////////////////////////////////// 601// Shaders 602/////////////////////////////////////////////////////////////////////////////// 603 604void OpenGLRenderer::resetShader() { 605 mShader = NULL; 606} 607 608void OpenGLRenderer::setupShader(SkiaShader* shader) { 609 mShader = shader; 610 if (mShader) { 611 mShader->set(&mTextureCache, &mGradientCache); 612 } 613} 614 615/////////////////////////////////////////////////////////////////////////////// 616// Color filters 617/////////////////////////////////////////////////////////////////////////////// 618 619void OpenGLRenderer::resetColorFilter() { 620 mColorFilter = NULL; 621} 622 623void OpenGLRenderer::setupColorFilter(SkiaColorFilter* filter) { 624 mColorFilter = filter; 625} 626 627/////////////////////////////////////////////////////////////////////////////// 628// Drawing implementation 629/////////////////////////////////////////////////////////////////////////////// 630 631void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 632 int color, SkXfermode::Mode mode, bool ignoreTransform) { 633 // If a shader is set, preserve only the alpha 634 if (mShader) { 635 color |= 0x00ffffff; 636 } 637 638 // Render using pre-multiplied alpha 639 const int alpha = (color >> 24) & 0xFF; 640 const GLfloat a = alpha / 255.0f; 641 const GLfloat r = a * ((color >> 16) & 0xFF) / 255.0f; 642 const GLfloat g = a * ((color >> 8) & 0xFF) / 255.0f; 643 const GLfloat b = a * ((color ) & 0xFF) / 255.0f; 644 645 GLuint textureUnit = 0; 646 647 // Setup the blending mode 648 chooseBlending(alpha < 255 || (mShader && mShader->blend()), mode); 649 650 // Describe the required shaders 651 ProgramDescription description; 652 if (mShader) { 653 mShader->describe(description, mExtensions); 654 } 655 if (mColorFilter) { 656 mColorFilter->describe(description, mExtensions); 657 } 658 659 // Build and use the appropriate shader 660 useProgram(mProgramCache.get(description)); 661 662 // Setup attributes 663 glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE, 664 gMeshStride, &mMeshVertices[0].position[0]); 665 666 // Setup uniforms 667 mModelView.loadTranslate(left, top, 0.0f); 668 mModelView.scale(right - left, bottom - top, 1.0f); 669 if (!ignoreTransform) { 670 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 671 } else { 672 mat4 identity; 673 mCurrentProgram->set(mOrthoMatrix, mModelView, identity); 674 } 675 glUniform4f(mCurrentProgram->color, r, g, b, a); 676 677 // Setup attributes and uniforms required by the shaders 678 if (mShader) { 679 mShader->setupProgram(mCurrentProgram, mModelView, *mSnapshot, &textureUnit); 680 } 681 if (mColorFilter) { 682 mColorFilter->setupProgram(mCurrentProgram); 683 } 684 685 // Draw the mesh 686 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 687} 688 689void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 690 const Texture* texture, const SkPaint* paint) { 691 int alpha; 692 SkXfermode::Mode mode; 693 getAlphaAndMode(paint, &alpha, &mode); 694 695 drawTextureMesh(left, top, right, bottom, texture->id, alpha / 255.0f, mode, texture->blend, 696 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 697} 698 699void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 700 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend) { 701 drawTextureMesh(left, top, right, bottom, texture, alpha, mode, blend, 702 &mMeshVertices[0].position[0], &mMeshVertices[0].texture[0], NULL); 703} 704 705void OpenGLRenderer::drawTextureMesh(float left, float top, float right, float bottom, 706 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, 707 GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount) { 708 ProgramDescription description; 709 description.hasTexture = true; 710 if (mColorFilter) { 711 mColorFilter->describe(description, mExtensions); 712 } 713 714 mModelView.loadTranslate(left, top, 0.0f); 715 mModelView.scale(right - left, bottom - top, 1.0f); 716 717 useProgram(mProgramCache.get(description)); 718 mCurrentProgram->set(mOrthoMatrix, mModelView, mSnapshot->transform); 719 720 chooseBlending(blend || alpha < 1.0f, mode); 721 722 // Texture 723 bindTexture(texture, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE, 0); 724 glUniform1i(mCurrentProgram->getUniform("sampler"), 0); 725 726 // Always premultiplied 727 glUniform4f(mCurrentProgram->color, alpha, alpha, alpha, alpha); 728 729 // Mesh 730 int texCoordsSlot = mCurrentProgram->getAttrib("texCoords"); 731 glEnableVertexAttribArray(texCoordsSlot); 732 glVertexAttribPointer(mCurrentProgram->position, 2, GL_FLOAT, GL_FALSE, 733 gMeshStride, vertices); 734 glVertexAttribPointer(texCoordsSlot, 2, GL_FLOAT, GL_FALSE, gMeshStride, texCoords); 735 736 // Color filter 737 if (mColorFilter) { 738 mColorFilter->setupProgram(mCurrentProgram); 739 } 740 741 if (!indices) { 742 glDrawArrays(GL_TRIANGLE_STRIP, 0, gMeshCount); 743 } else { 744 glDrawElements(GL_TRIANGLES, elementsCount, GL_UNSIGNED_SHORT, indices); 745 } 746 glDisableVertexAttribArray(texCoordsSlot); 747} 748 749void OpenGLRenderer::chooseBlending(bool blend, SkXfermode::Mode mode, bool isPremultiplied) { 750 blend = blend || mode != SkXfermode::kSrcOver_Mode; 751 if (blend) { 752 if (!mBlend) { 753 glEnable(GL_BLEND); 754 } 755 756 GLenum sourceMode = gBlends[mode].src; 757 GLenum destMode = gBlends[mode].dst; 758 if (!isPremultiplied && sourceMode == GL_ONE) { 759 sourceMode = GL_SRC_ALPHA; 760 } 761 762 if (sourceMode != mLastSrcMode || destMode != mLastDstMode) { 763 glBlendFunc(sourceMode, destMode); 764 mLastSrcMode = sourceMode; 765 mLastDstMode = destMode; 766 } 767 } else if (mBlend) { 768 glDisable(GL_BLEND); 769 } 770 mBlend = blend; 771} 772 773bool OpenGLRenderer::useProgram(Program* program) { 774 if (!program->isInUse()) { 775 if (mCurrentProgram != NULL) mCurrentProgram->remove(); 776 program->use(); 777 mCurrentProgram = program; 778 return false; 779 } 780 return true; 781} 782 783void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 784 TextureVertex* v = &mMeshVertices[0]; 785 TextureVertex::setUV(v++, u1, v1); 786 TextureVertex::setUV(v++, u2, v1); 787 TextureVertex::setUV(v++, u1, v2); 788 TextureVertex::setUV(v++, u2, v2); 789} 790 791void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 792 if (paint) { 793 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 794 if (!isMode) { 795 // Assume SRC_OVER 796 *mode = SkXfermode::kSrcOver_Mode; 797 } 798 799 // Skia draws using the color's alpha channel if < 255 800 // Otherwise, it uses the paint's alpha 801 int color = paint->getColor(); 802 *alpha = (color >> 24) & 0xFF; 803 if (*alpha == 255) { 804 *alpha = paint->getAlpha(); 805 } 806 } else { 807 *mode = SkXfermode::kSrcOver_Mode; 808 *alpha = 255; 809 } 810} 811 812void OpenGLRenderer::bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit) { 813 glActiveTexture(gTextureUnits[textureUnit]); 814 glBindTexture(GL_TEXTURE_2D, texture); 815 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapS); 816 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT); 817} 818 819}; // namespace uirenderer 820}; // namespace android 821