OpenGLRenderer.cpp revision f86ef57f8bcd8ba43ce222ec6a8b4f67d3600640
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 <utils/Log.h> 26 27#include "OpenGLRenderer.h" 28 29namespace android { 30namespace uirenderer { 31 32/////////////////////////////////////////////////////////////////////////////// 33// Defines 34/////////////////////////////////////////////////////////////////////////////// 35 36#define MAX_TEXTURE_COUNT 128 37 38#define SV(x, y) { { x, y } } 39#define FV(x, y, u, v) { { x, y }, { u, v } } 40 41/////////////////////////////////////////////////////////////////////////////// 42// Globals 43/////////////////////////////////////////////////////////////////////////////// 44 45static const SimpleVertex gDrawColorVertices[] = { 46 SV(0.0f, 0.0f), 47 SV(1.0f, 0.0f), 48 SV(0.0f, 1.0f), 49 SV(1.0f, 1.0f) 50}; 51static const GLsizei gDrawColorVertexStride = sizeof(SimpleVertex); 52static const GLsizei gDrawColorVertexCount = 4; 53 54// This array is never used directly but used as a memcpy source in the 55// OpenGLRenderer constructor 56static const TextureVertex gDrawTextureVertices[] = { 57 FV(0.0f, 0.0f, 0.0f, 0.0f), 58 FV(1.0f, 0.0f, 1.0f, 0.0f), 59 FV(0.0f, 1.0f, 0.0f, 1.0f), 60 FV(1.0f, 1.0f, 1.0f, 1.0f) 61}; 62static const GLsizei gDrawTextureVertexStride = sizeof(TextureVertex); 63static const GLsizei gDrawTextureVertexCount = 4; 64 65// In this array, the index of each Blender equals the value of the first 66// entry. For instance, gBlends[1] == gBlends[SkXfermode::kSrc_Mode] 67static const Blender gBlends[] = { 68 { SkXfermode::kClear_Mode, GL_ZERO, GL_ZERO }, 69 { SkXfermode::kSrc_Mode, GL_ONE, GL_ZERO }, 70 { SkXfermode::kDst_Mode, GL_ZERO, GL_ONE }, 71 { SkXfermode::kSrcOver_Mode, GL_ONE, GL_ONE_MINUS_SRC_ALPHA }, 72 { SkXfermode::kDstOver_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE }, 73 { SkXfermode::kSrcIn_Mode, GL_DST_ALPHA, GL_ZERO }, 74 { SkXfermode::kDstIn_Mode, GL_ZERO, GL_SRC_ALPHA }, 75 { SkXfermode::kSrcOut_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ZERO }, 76 { SkXfermode::kDstOut_Mode, GL_ZERO, GL_ONE_MINUS_SRC_ALPHA }, 77 { SkXfermode::kSrcATop_Mode, GL_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA }, 78 { SkXfermode::kDstATop_Mode, GL_ONE_MINUS_DST_ALPHA, GL_SRC_ALPHA }, 79 { SkXfermode::kXor_Mode, GL_ONE_MINUS_DST_ALPHA, GL_ONE_MINUS_SRC_ALPHA } 80}; 81 82/////////////////////////////////////////////////////////////////////////////// 83// Constructors/destructor 84/////////////////////////////////////////////////////////////////////////////// 85 86OpenGLRenderer::OpenGLRenderer(): mTextureCache(MAX_TEXTURE_COUNT) { 87 LOGD("Create OpenGLRenderer"); 88 89 mDrawColorShader = new DrawColorProgram; 90 mDrawTextureShader = new DrawTextureProgram; 91 92 memcpy(mDrawTextureVertices, gDrawTextureVertices, sizeof(gDrawTextureVertices)); 93} 94 95OpenGLRenderer::~OpenGLRenderer() { 96 LOGD("Destroy OpenGLRenderer"); 97 98 mTextureCache.clear(); 99} 100 101/////////////////////////////////////////////////////////////////////////////// 102// Setup 103/////////////////////////////////////////////////////////////////////////////// 104 105void OpenGLRenderer::setViewport(int width, int height) { 106 glViewport(0, 0, width, height); 107 108 mat4 ortho; 109 ortho.loadOrtho(0, width, height, 0, -1, 1); 110 ortho.copyTo(mOrthoMatrix); 111 112 mWidth = width; 113 mHeight = height; 114 mFirstSnapshot.height = height; 115} 116 117void OpenGLRenderer::prepare() { 118 mSnapshot = &mFirstSnapshot; 119 mSaveCount = 0; 120 121 glDisable(GL_SCISSOR_TEST); 122 123 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 124 glClear(GL_COLOR_BUFFER_BIT); 125 126 glEnable(GL_SCISSOR_TEST); 127 glScissor(0, 0, mWidth, mHeight); 128 129 mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight); 130} 131 132/////////////////////////////////////////////////////////////////////////////// 133// State management 134/////////////////////////////////////////////////////////////////////////////// 135 136int OpenGLRenderer::getSaveCount() const { 137 return mSaveCount; 138} 139 140int OpenGLRenderer::save(int flags) { 141 return saveSnapshot(); 142} 143 144void OpenGLRenderer::restore() { 145 if (mSaveCount == 0) return; 146 147 if (restoreSnapshot()) { 148 setScissorFromClip(); 149 } 150} 151 152void OpenGLRenderer::restoreToCount(int saveCount) { 153 if (saveCount <= 0 || saveCount > mSaveCount) return; 154 155 bool restoreClip = false; 156 157 while (mSaveCount != saveCount - 1) { 158 restoreClip |= restoreSnapshot(); 159 } 160 161 if (restoreClip) { 162 setScissorFromClip(); 163 } 164} 165 166int OpenGLRenderer::saveSnapshot() { 167 mSnapshot = new Snapshot(mSnapshot); 168 return ++mSaveCount; 169} 170 171bool OpenGLRenderer::restoreSnapshot() { 172 bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet; 173 bool restoreLayer = mSnapshot->flags & Snapshot::kFlagIsLayer; 174 bool restoreOrtho = mSnapshot->flags & Snapshot::kFlagDirtyOrtho; 175 176 sp<Snapshot> current = mSnapshot; 177 sp<Snapshot> previous = mSnapshot->previous; 178 179 if (restoreOrtho) { 180 memcpy(mOrthoMatrix, current->orthoMatrix, sizeof(mOrthoMatrix)); 181 } 182 183 if (restoreLayer) { 184 composeLayer(current, previous); 185 } 186 187 mSnapshot = previous; 188 mSaveCount--; 189 190 return restoreClip; 191} 192 193void OpenGLRenderer::composeLayer(sp<Snapshot> current, sp<Snapshot> previous) { 194 // Unbind current FBO and restore previous one 195 // Most of the time, previous->fbo will be 0 to bind the default buffer 196 glBindFramebuffer(GL_FRAMEBUFFER, previous->fbo); 197 198 // Restore the clip from the previous snapshot 199 const Rect& clip = previous->getMappedClip(); 200 glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight()); 201 202 // Compute the correct texture coordinates for the FBO texture 203 // The texture is currently as big as the window but drawn with 204 // a quad of the appropriate size 205 const Rect& layer = current->layer; 206 207 drawTextureRect(layer.left, layer.top, layer.right, layer.bottom, 208 current->texture, current->alpha, current->mode, true, true); 209 210 // TODO Don't delete these things, but cache them 211 glDeleteFramebuffers(1, ¤t->fbo); 212 glDeleteTextures(1, ¤t->texture); 213} 214 215/////////////////////////////////////////////////////////////////////////////// 216// Layers 217/////////////////////////////////////////////////////////////////////////////// 218 219int OpenGLRenderer::saveLayer(float left, float top, float right, float bottom, 220 const SkPaint* p, int flags) { 221 int count = saveSnapshot(); 222 223 int alpha = 255; 224 SkXfermode::Mode mode; 225 226 if (p) { 227 alpha = p->getAlpha(); 228 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 229 if (!isMode) { 230 // Assume SRC_OVER 231 mode = SkXfermode::kSrcOver_Mode; 232 } 233 } else { 234 mode = SkXfermode::kSrcOver_Mode; 235 } 236 237 createLayer(mSnapshot, left, top, right, bottom, alpha, mode, flags); 238 239 return count; 240} 241 242int OpenGLRenderer::saveLayerAlpha(float left, float top, float right, float bottom, 243 int alpha, int flags) { 244 int count = saveSnapshot(); 245 createLayer(mSnapshot, left, top, right, bottom, alpha, SkXfermode::kSrcOver_Mode, flags); 246 return count; 247} 248 249bool OpenGLRenderer::createLayer(sp<Snapshot> snapshot, float left, float top, 250 float right, float bottom, int alpha, SkXfermode::Mode mode,int flags) { 251 // Generate the FBO and attach the texture 252 glGenFramebuffers(1, &snapshot->fbo); 253 glBindFramebuffer(GL_FRAMEBUFFER, snapshot->fbo); 254 255 // Generate the texture in which the FBO will draw 256 glGenTextures(1, &snapshot->texture); 257 glBindTexture(GL_TEXTURE_2D, snapshot->texture); 258 259 // The FBO will not be scaled, so we can use lower quality filtering 260 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 261 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 262 263 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 264 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 265 266 // TODO VERY IMPORTANT: Fix TextView to not call saveLayer() all the time 267 // TODO Use an FBO cache 268 269 const GLsizei width = right - left; 270 const GLsizei height = bottom - top; 271 272 const GLint format = (flags & SkCanvas::kHasAlphaLayer_SaveFlag) ? GL_RGBA : GL_RGB; 273 glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, NULL); 274 glBindTexture(GL_TEXTURE_2D, 0); 275 276 // Bind texture to FBO 277 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 278 snapshot->texture, 0); 279 280 GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER); 281 if (status != GL_FRAMEBUFFER_COMPLETE) { 282 LOGD("Framebuffer incomplete (GL error code 0x%x)", status); 283 284 glDeleteFramebuffers(1, &snapshot->fbo); 285 glDeleteTextures(1, &snapshot->texture); 286 287 return false; 288 } 289 290 // Clear the FBO 291 glDisable(GL_SCISSOR_TEST); 292 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 293 glClear(GL_COLOR_BUFFER_BIT); 294 glEnable(GL_SCISSOR_TEST); 295 296 snapshot->flags |= Snapshot::kFlagIsLayer; 297 snapshot->mode = mode; 298 snapshot->alpha = alpha / 255.0f; 299 snapshot->layer.set(left, top, right, bottom); 300 301 // Creates a new snapshot to draw into the FBO 302 saveSnapshot(); 303 // TODO: This doesn't preserve other transformations (check Skia first) 304 mSnapshot->transform.loadTranslate(-left, -top, 0.0f); 305 mSnapshot->clipRect.set(left, top, right, bottom); 306 mSnapshot->height = bottom - top; 307 setScissorFromClip(); 308 309 mSnapshot->flags = Snapshot::kFlagDirtyTransform | Snapshot::kFlagDirtyOrtho | 310 Snapshot::kFlagClipSet; 311 memcpy(mSnapshot->orthoMatrix, mOrthoMatrix, sizeof(mOrthoMatrix)); 312 313 // Change the ortho projection 314 mat4 ortho; 315 ortho.loadOrtho(0.0f, right - left, bottom - top, 0.0f, 0.0f, 1.0f); 316 ortho.copyTo(mOrthoMatrix); 317 318 return true; 319} 320 321/////////////////////////////////////////////////////////////////////////////// 322// Transforms 323/////////////////////////////////////////////////////////////////////////////// 324 325void OpenGLRenderer::translate(float dx, float dy) { 326 mSnapshot->transform.translate(dx, dy, 0.0f); 327 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 328} 329 330void OpenGLRenderer::rotate(float degrees) { 331 mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f); 332 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 333} 334 335void OpenGLRenderer::scale(float sx, float sy) { 336 mSnapshot->transform.scale(sx, sy, 1.0f); 337 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 338} 339 340void OpenGLRenderer::setMatrix(SkMatrix* matrix) { 341 mSnapshot->transform.load(*matrix); 342 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 343} 344 345void OpenGLRenderer::getMatrix(SkMatrix* matrix) { 346 mSnapshot->transform.copyTo(*matrix); 347} 348 349void OpenGLRenderer::concatMatrix(SkMatrix* matrix) { 350 mat4 m(*matrix); 351 mSnapshot->transform.multiply(m); 352 mSnapshot->flags |= Snapshot::kFlagDirtyTransform; 353} 354 355/////////////////////////////////////////////////////////////////////////////// 356// Clipping 357/////////////////////////////////////////////////////////////////////////////// 358 359void OpenGLRenderer::setScissorFromClip() { 360 const Rect& clip = mSnapshot->getMappedClip(); 361 glScissor(clip.left, mSnapshot->height - clip.bottom, clip.getWidth(), clip.getHeight()); 362} 363 364const Rect& OpenGLRenderer::getClipBounds() { 365 return mSnapshot->clipRect; 366} 367 368bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) { 369 /* 370 * The documentation of quickReject() indicates that the specified rect 371 * is transformed before being compared to the clip rect. However, the 372 * clip rect is not stored transformed in the snapshot and can thus be 373 * compared directly 374 * 375 * The following code can be used instead to performed a mapped comparison: 376 * 377 * mSnapshot->transform.mapRect(r); 378 * const Rect& clip = mSnapshot->getMappedClip(); 379 * return !clip.intersects(r); 380 */ 381 Rect r(left, top, right, bottom); 382 return !mSnapshot->clipRect.intersects(r); 383} 384 385bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom) { 386 bool clipped = mSnapshot->clipRect.intersect(left, top, right, bottom); 387 if (clipped) { 388 mSnapshot->flags |= Snapshot::kFlagClipSet; 389 setScissorFromClip(); 390 } 391 return clipped; 392} 393 394/////////////////////////////////////////////////////////////////////////////// 395// Drawing 396/////////////////////////////////////////////////////////////////////////////// 397 398void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint) { 399 const Texture* texture = mTextureCache.get(bitmap); 400 401 int alpha; 402 SkXfermode::Mode mode; 403 getAlphaAndMode(paint, &alpha, &mode); 404 405 drawTextureRect(left, top, left + texture->width, top + texture->height, texture->id, 406 alpha / 255.0f, mode, texture->blend, true); 407} 408 409void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint) { 410 Rect r(0.0f, 0.0f, bitmap->width(), bitmap->height()); 411 const mat4 transform(*matrix); 412 transform.mapRect(r); 413 414 const Texture* texture = mTextureCache.get(bitmap); 415 416 int alpha; 417 SkXfermode::Mode mode; 418 getAlphaAndMode(paint, &alpha, &mode); 419 420 drawTextureRect(r.left, r.top, r.right, r.bottom, texture->id, 421 alpha / 255.0f, mode, texture->blend, true); 422} 423 424void OpenGLRenderer::drawBitmap(SkBitmap* bitmap, 425 float srcLeft, float srcTop, float srcRight, float srcBottom, 426 float dstLeft, float dstTop, float dstRight, float dstBottom, 427 const SkPaint* paint) { 428 const Texture* texture = mTextureCache.get(bitmap); 429 430 int alpha; 431 SkXfermode::Mode mode; 432 getAlphaAndMode(paint, &alpha, &mode); 433 434 const float width = texture->width; 435 const float height = texture->height; 436 437 const float u1 = srcLeft / width; 438 const float v1 = srcTop / height; 439 const float u2 = srcRight / width; 440 const float v2 = srcBottom / height; 441 442 resetDrawTextureTexCoords(u1, v1, u2, v2); 443 444 drawTextureRect(dstLeft, dstTop, dstRight, dstBottom, texture->id, 445 alpha / 255.0f, mode, texture->blend, true); 446 447 resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f); 448} 449 450void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) { 451 const Rect& clip = mSnapshot->clipRect; 452 drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color, mode); 453} 454 455void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, const SkPaint* p) { 456 SkXfermode::Mode mode; 457 458 const bool isMode = SkXfermode::IsMode(p->getXfermode(), &mode); 459 if (!isMode) { 460 // Assume SRC_OVER 461 mode = SkXfermode::kSrcOver_Mode; 462 } 463 464 // Skia draws using the color's alpha channel if < 255 465 // Otherwise, it uses the paint's alpha 466 int color = p->getColor(); 467 if (((color >> 24) & 0xFF) == 255) { 468 color |= p->getAlpha() << 24; 469 } 470 471 drawColorRect(left, top, right, bottom, color, mode); 472} 473 474void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, 475 int color, SkXfermode::Mode mode) { 476 const int alpha = (color >> 24) & 0xFF; 477 const bool blend = alpha < 255 || mode != SkXfermode::kSrcOver_Mode; 478 479 const GLfloat a = alpha / 255.0f; 480 const GLfloat r = ((color >> 16) & 0xFF) / 255.0f; 481 const GLfloat g = ((color >> 8) & 0xFF) / 255.0f; 482 const GLfloat b = ((color ) & 0xFF) / 255.0f; 483 484 if (blend) { 485 glEnable(GL_BLEND); 486 glBlendFunc(gBlends[mode].src, gBlends[mode].dst); 487 } 488 489 mModelView.loadTranslate(left, top, 0.0f); 490 mModelView.scale(right - left, bottom - top, 1.0f); 491 492 mDrawColorShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]); 493 494 const GLvoid* p = &gDrawColorVertices[0].position[0]; 495 496 glEnableVertexAttribArray(mDrawColorShader->position); 497 glVertexAttribPointer(mDrawColorShader->position, 2, GL_FLOAT, GL_FALSE, 498 gDrawColorVertexStride, p); 499 glVertexAttrib4f(mDrawColorShader->color, r, g, b, a); 500 501 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawColorVertexCount); 502 503 glDisableVertexAttribArray(mDrawColorShader->position); 504 505 if (blend) { 506 glDisable(GL_BLEND); 507 } 508} 509 510void OpenGLRenderer::drawTextureRect(float left, float top, float right, float bottom, 511 GLuint texture, float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied) { 512 mModelView.loadTranslate(left, top, 0.0f); 513 mModelView.scale(right - left, bottom - top, 1.0f); 514 515 mDrawTextureShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]); 516 517 if (blend || alpha < 1.0f || mode != SkXfermode::kSrcOver_Mode) { 518 GLenum sourceMode = gBlends[mode].src; 519 if (!isPremultiplied && sourceMode == GL_ONE) { 520 sourceMode = GL_SRC_ALPHA; 521 } 522 523 glEnable(GL_BLEND); 524 glBlendFunc(sourceMode, gBlends[mode].dst); 525 } 526 527 glBindTexture(GL_TEXTURE_2D, texture); 528 529 // TODO handle tiling and filtering here 530 531 glActiveTexture(GL_TEXTURE0); 532 glUniform1i(mDrawTextureShader->sampler, 0); 533 534 const GLvoid* p = &mDrawTextureVertices[0].position[0]; 535 const GLvoid* t = &mDrawTextureVertices[0].texture[0]; 536 537 glEnableVertexAttribArray(mDrawTextureShader->position); 538 glVertexAttribPointer(mDrawTextureShader->position, 2, GL_FLOAT, GL_FALSE, 539 gDrawTextureVertexStride, p); 540 541 glEnableVertexAttribArray(mDrawTextureShader->texCoords); 542 glVertexAttribPointer(mDrawTextureShader->texCoords, 2, GL_FLOAT, GL_FALSE, 543 gDrawTextureVertexStride, t); 544 545 glVertexAttrib4f(mDrawTextureShader->color, 1.0f, 1.0f, 1.0f, alpha); 546 547 glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawTextureVertexCount); 548 549 glDisableVertexAttribArray(mDrawTextureShader->position); 550 glDisableVertexAttribArray(mDrawTextureShader->texCoords); 551 552 glBindTexture(GL_TEXTURE_2D, 0); 553 glDisable(GL_BLEND); 554} 555 556void OpenGLRenderer::resetDrawTextureTexCoords(float u1, float v1, float u2, float v2) { 557 mDrawTextureVertices[0].texture[0] = u1; 558 mDrawTextureVertices[0].texture[1] = v1; 559 mDrawTextureVertices[1].texture[0] = u2; 560 mDrawTextureVertices[1].texture[1] = v1; 561 mDrawTextureVertices[2].texture[0] = u1; 562 mDrawTextureVertices[2].texture[1] = v2; 563 mDrawTextureVertices[3].texture[0] = u2; 564 mDrawTextureVertices[3].texture[1] = v2; 565} 566 567void OpenGLRenderer::getAlphaAndMode(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode) { 568 if (paint) { 569 const bool isMode = SkXfermode::IsMode(paint->getXfermode(), mode); 570 if (!isMode) { 571 // Assume SRC_OVER 572 *mode = SkXfermode::kSrcOver_Mode; 573 } 574 575 // Skia draws using the color's alpha channel if < 255 576 // Otherwise, it uses the paint's alpha 577 int color = paint->getColor(); 578 *alpha = (color >> 24) & 0xFF; 579 if (*alpha == 255) { 580 *alpha = paint->getAlpha(); 581 } 582 } else { 583 *mode = SkXfermode::kSrcOver_Mode; 584 *alpha = 255; 585 } 586} 587 588}; // namespace uirenderer 589}; // namespace android 590