LayerRenderer.cpp revision 61d37041ac76a95aedb98d3550bb5efa33d898a1 
1/*
2 * Copyright (C) 2011 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 <ui/Rect.h>
20
21#include "LayerCache.h"
22#include "LayerRenderer.h"
23#include "Matrix.h"
24#include "Properties.h"
25#include "Rect.h"
26
27namespace android {
28namespace uirenderer {
29
30///////////////////////////////////////////////////////////////////////////////
31// Rendering
32///////////////////////////////////////////////////////////////////////////////
33
34LayerRenderer::LayerRenderer(Layer* layer): mLayer(layer) {
35}
36
37LayerRenderer::~LayerRenderer() {
38}
39
40void LayerRenderer::setViewport(int width, int height) {
41    initViewport(width, height);
42}
43
44int LayerRenderer::prepareDirty(float left, float top, float right, float bottom, bool opaque) {
45    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo());
46
47    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->getFbo());
48
49    const float width = mLayer->layer.getWidth();
50    const float height = mLayer->layer.getHeight();
51
52    Rect dirty(left, top, right, bottom);
53    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
54            dirty.right >= width && dirty.bottom >= height)) {
55        mLayer->region.clear();
56        dirty.set(0.0f, 0.0f, width, height);
57    } else {
58        dirty.intersect(0.0f, 0.0f, width, height);
59        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
60        mLayer->region.subtractSelf(r);
61    }
62
63    return OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
64}
65
66void LayerRenderer::finish() {
67    OpenGLRenderer::finish();
68
69    generateMesh();
70
71    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo());
72
73    // No need to unbind our FBO, this will be taken care of by the caller
74    // who will invoke OpenGLRenderer::resume()
75}
76
77GLint LayerRenderer::getTargetFbo() {
78    return mLayer->getFbo();
79}
80
81bool LayerRenderer::suppressErrorChecks() {
82    return true;
83}
84
85///////////////////////////////////////////////////////////////////////////////
86// Dirty region tracking
87///////////////////////////////////////////////////////////////////////////////
88
89bool LayerRenderer::hasLayer() {
90    return true;
91}
92
93Region* LayerRenderer::getRegion() {
94    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
95        return OpenGLRenderer::getRegion();
96    }
97    return &mLayer->region;
98}
99
100// TODO: This implementation is flawed and can generate T-junctions
101//       in the mesh, which will in turn produce cracks when the
102//       mesh is rotated/skewed. The easiest way to fix this would
103//       be, for each row, to add new vertices shared with the previous
104//       row when the two rows share an edge.
105//       In practice, T-junctions do not appear often so this has yet
106//       to be fixed.
107void LayerRenderer::generateMesh() {
108    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
109        if (mLayer->mesh) {
110            delete mLayer->mesh;
111            delete mLayer->meshIndices;
112
113            mLayer->mesh = NULL;
114            mLayer->meshIndices = NULL;
115            mLayer->meshElementCount = 0;
116        }
117
118        mLayer->setRegionAsRect();
119        return;
120    }
121
122    size_t count;
123    const android::Rect* rects = mLayer->region.getArray(&count);
124
125    GLsizei elementCount = count * 6;
126
127    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
128        delete mLayer->mesh;
129        delete mLayer->meshIndices;
130
131        mLayer->mesh = NULL;
132        mLayer->meshIndices = NULL;
133    }
134
135    bool rebuildIndices = false;
136    if (!mLayer->mesh) {
137        mLayer->mesh = new TextureVertex[count * 4];
138        mLayer->meshIndices = new uint16_t[elementCount];
139        rebuildIndices = true;
140    }
141    mLayer->meshElementCount = elementCount;
142
143    const float texX = 1.0f / float(mLayer->getWidth());
144    const float texY = 1.0f / float(mLayer->getHeight());
145    const float height = mLayer->layer.getHeight();
146
147    TextureVertex* mesh = mLayer->mesh;
148    uint16_t* indices = mLayer->meshIndices;
149
150    for (size_t i = 0; i < count; i++) {
151        const android::Rect* r = &rects[i];
152
153        const float u1 = r->left * texX;
154        const float v1 = (height - r->top) * texY;
155        const float u2 = r->right * texX;
156        const float v2 = (height - r->bottom) * texY;
157
158        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
159        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
160        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
161        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
162
163        if (rebuildIndices) {
164            uint16_t quad = i * 4;
165            int index = i * 6;
166            indices[index    ] = quad;       // top-left
167            indices[index + 1] = quad + 1;   // top-right
168            indices[index + 2] = quad + 2;   // bottom-left
169            indices[index + 3] = quad + 2;   // bottom-left
170            indices[index + 4] = quad + 1;   // top-right
171            indices[index + 5] = quad + 3;   // bottom-right
172        }
173    }
174}
175
176///////////////////////////////////////////////////////////////////////////////
177// Layers management
178///////////////////////////////////////////////////////////////////////////////
179
180Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
181    LAYER_RENDERER_LOGD("Requesting new render layer %dx%d", width, height);
182
183    Caches& caches = Caches::getInstance();
184    GLuint fbo = caches.fboCache.get();
185    if (!fbo) {
186        ALOGW("Could not obtain an FBO");
187        return NULL;
188    }
189
190    caches.activeTexture(0);
191    Layer* layer = caches.layerCache.get(width, height);
192    if (!layer) {
193        ALOGW("Could not obtain a layer");
194        return NULL;
195    }
196
197    layer->setFbo(fbo);
198    layer->layer.set(0.0f, 0.0f, width, height);
199    layer->texCoords.set(0.0f, height / float(layer->getHeight()),
200            width / float(layer->getWidth()), 0.0f);
201    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
202    layer->setBlend(!isOpaque);
203    layer->setColorFilter(NULL);
204    layer->region.clear();
205
206    GLuint previousFbo;
207    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
208
209    glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo());
210    layer->bindTexture();
211
212    // Initialize the texture if needed
213    if (layer->isEmpty()) {
214        layer->setEmpty(false);
215        layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
216
217        if (glGetError() != GL_NO_ERROR) {
218            ALOGD("Could not allocate texture for layer (fbo=%d %dx%d)",
219                    fbo, width, height);
220
221            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
222
223            Caches::getInstance().resourceCache.decrementRefcount(layer);
224
225            return NULL;
226        }
227    }
228
229    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
230            layer->getTexture(), 0);
231
232    caches.disableScissor();
233    glClear(GL_COLOR_BUFFER_BIT);
234
235    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
236
237    return layer;
238}
239
240bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
241    if (layer) {
242        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height);
243
244        if (Caches::getInstance().layerCache.resize(layer, width, height)) {
245            layer->layer.set(0.0f, 0.0f, width, height);
246            layer->texCoords.set(0.0f, height / float(layer->getHeight()),
247                    width / float(layer->getWidth()), 0.0f);
248        } else {
249            Caches::getInstance().resourceCache.decrementRefcount(layer);
250            return false;
251        }
252    }
253
254    return true;
255}
256
257Layer* LayerRenderer::createTextureLayer(bool isOpaque) {
258    LAYER_RENDERER_LOGD("Creating new texture layer");
259
260    Layer* layer = new Layer(0, 0);
261    layer->setCacheable(false);
262    layer->setTextureLayer(true);
263    layer->setBlend(!isOpaque);
264    layer->setEmpty(true);
265    layer->setFbo(0);
266    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
267    layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
268    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
269    layer->region.clear();
270    layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer()
271
272    Caches::getInstance().activeTexture(0);
273    layer->generateTexture();
274
275    return layer;
276}
277
278void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
279        bool isOpaque, GLenum renderTarget, float* transform) {
280    if (layer) {
281        layer->setBlend(!isOpaque);
282        layer->setSize(width, height);
283        layer->layer.set(0.0f, 0.0f, width, height);
284        layer->region.set(width, height);
285        layer->regionRect.set(0.0f, 0.0f, width, height);
286        layer->getTexTransform().load(transform);
287
288        if (renderTarget != layer->getRenderTarget()) {
289            layer->setRenderTarget(renderTarget);
290            layer->bindTexture();
291            layer->setFilter(GL_NEAREST, false, true);
292            layer->setWrap(GL_CLAMP_TO_EDGE, false, true);
293        }
294    }
295}
296
297void LayerRenderer::destroyLayer(Layer* layer) {
298    if (layer) {
299        LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d",
300                layer->getWidth(), layer->getHeight(), layer->getFbo());
301
302        GLuint fbo = layer->getFbo();
303        if (fbo) {
304            flushLayer(layer);
305            Caches::getInstance().fboCache.put(fbo);
306            layer->setFbo(0);
307        }
308
309        if (!Caches::getInstance().layerCache.put(layer)) {
310            LAYER_RENDERER_LOGD("  Destroyed!");
311            Caches::getInstance().resourceCache.decrementRefcount(layer);
312        } else {
313            LAYER_RENDERER_LOGD("  Cached!");
314#if DEBUG_LAYER_RENDERER
315            Caches::getInstance().layerCache.dump();
316#endif
317            layer->region.clear();
318        }
319    }
320}
321
322void LayerRenderer::destroyLayerDeferred(Layer* layer) {
323    if (layer) {
324        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->getFbo());
325
326        Caches::getInstance().deleteLayerDeferred(layer);
327    }
328}
329
330void LayerRenderer::flushLayer(Layer* layer) {
331#ifdef GL_EXT_discard_framebuffer
332    GLuint fbo = layer->getFbo();
333    if (layer && fbo) {
334        // If possible, discard any enqueud operations on deferred
335        // rendering architectures
336        if (Caches::getInstance().extensions.hasDiscardFramebuffer()) {
337            GLuint previousFbo;
338            glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
339            if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, fbo);
340
341            const GLenum attachments[] = { GL_COLOR_ATTACHMENT0 };
342            glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);
343
344            if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
345        }
346    }
347#endif
348}
349
350bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) {
351    Caches& caches = Caches::getInstance();
352    if (layer && bitmap->width() <= caches.maxTextureSize &&
353            bitmap->height() <= caches.maxTextureSize) {
354
355        GLuint fbo = caches.fboCache.get();
356        if (!fbo) {
357            ALOGW("Could not obtain an FBO");
358            return false;
359        }
360
361        SkAutoLockPixels alp(*bitmap);
362
363        GLuint texture;
364        GLuint previousFbo;
365        GLuint previousViewport[4];
366
367        GLenum format;
368        GLenum type;
369
370        GLenum error = GL_NO_ERROR;
371        bool status = false;
372
373        switch (bitmap->config()) {
374            case SkBitmap::kA8_Config:
375                format = GL_ALPHA;
376                type = GL_UNSIGNED_BYTE;
377                break;
378            case SkBitmap::kRGB_565_Config:
379                format = GL_RGB;
380                type = GL_UNSIGNED_SHORT_5_6_5;
381                break;
382            case SkBitmap::kARGB_4444_Config:
383                format = GL_RGBA;
384                type = GL_UNSIGNED_SHORT_4_4_4_4;
385                break;
386            case SkBitmap::kARGB_8888_Config:
387            default:
388                format = GL_RGBA;
389                type = GL_UNSIGNED_BYTE;
390                break;
391        }
392
393        float alpha = layer->getAlpha();
394        SkXfermode::Mode mode = layer->getMode();
395        GLuint previousLayerFbo = layer->getFbo();
396
397        layer->setAlpha(255, SkXfermode::kSrc_Mode);
398        layer->setFbo(fbo);
399
400        glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
401        glGetIntegerv(GL_VIEWPORT, (GLint*) &previousViewport);
402        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
403
404        glGenTextures(1, &texture);
405        if ((error = glGetError()) != GL_NO_ERROR) goto error;
406
407        caches.activeTexture(0);
408        glBindTexture(GL_TEXTURE_2D, texture);
409
410        glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());
411
412        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
413        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
414
415        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
416        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
417
418        glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(),
419                0, format, type, NULL);
420        if ((error = glGetError()) != GL_NO_ERROR) goto error;
421
422        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
423                GL_TEXTURE_2D, texture, 0);
424        if ((error = glGetError()) != GL_NO_ERROR) goto error;
425
426        {
427            LayerRenderer renderer(layer);
428            renderer.setViewport(bitmap->width(), bitmap->height());
429            renderer.OpenGLRenderer::prepareDirty(0.0f, 0.0f,
430                    bitmap->width(), bitmap->height(), !layer->isBlend());
431
432            caches.disableScissor();
433            renderer.translate(0.0f, bitmap->height());
434            renderer.scale(1.0f, -1.0f);
435
436            mat4 texTransform(layer->getTexTransform());
437
438            mat4 invert;
439            invert.translate(0.0f, 1.0f, 0.0f);
440            invert.scale(1.0f, -1.0f, 1.0f);
441            layer->getTexTransform().multiply(invert);
442
443            if ((error = glGetError()) != GL_NO_ERROR) goto error;
444
445            {
446                Rect bounds;
447                bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height());
448                renderer.drawTextureLayer(layer, bounds);
449
450                glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
451                        type, bitmap->getPixels());
452
453                if ((error = glGetError()) != GL_NO_ERROR) goto error;
454            }
455
456            layer->getTexTransform().load(texTransform);
457            status = true;
458        }
459
460error:
461#if DEBUG_OPENGL
462        if (error != GL_NO_ERROR) {
463            ALOGD("GL error while copying layer into bitmap = 0x%x", error);
464        }
465#endif
466
467        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
468        layer->setAlpha(alpha, mode);
469        layer->setFbo(previousLayerFbo);
470        glDeleteTextures(1, &texture);
471        caches.fboCache.put(fbo);
472        glViewport(previousViewport[0], previousViewport[1],
473                previousViewport[2], previousViewport[3]);
474
475        return status;
476    }
477    return false;
478}
479
480}; // namespace uirenderer
481}; // namespace android
482