LayerRenderer.cpp revision 2055abaa0a590c35e27e1ae2e7d7cfccdfb98b59 
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 <private/hwui/DrawGlInfo.h>
22
23#include "LayerCache.h"
24#include "LayerRenderer.h"
25#include "Matrix.h"
26#include "Properties.h"
27#include "Rect.h"
28
29namespace android {
30namespace uirenderer {
31
32///////////////////////////////////////////////////////////////////////////////
33// Rendering
34///////////////////////////////////////////////////////////////////////////////
35
36LayerRenderer::LayerRenderer(Layer* layer): mLayer(layer) {
37}
38
39LayerRenderer::~LayerRenderer() {
40}
41
42void LayerRenderer::setViewport(int width, int height) {
43    initViewport(width, height);
44}
45
46status_t LayerRenderer::prepareDirty(float left, float top, float right, float bottom,
47        bool opaque) {
48    LAYER_RENDERER_LOGD("Rendering into layer, fbo = %d", mLayer->getFbo());
49
50    glBindFramebuffer(GL_FRAMEBUFFER, mLayer->getFbo());
51
52    const float width = mLayer->layer.getWidth();
53    const float height = mLayer->layer.getHeight();
54
55    Rect dirty(left, top, right, bottom);
56    if (dirty.isEmpty() || (dirty.left <= 0 && dirty.top <= 0 &&
57            dirty.right >= width && dirty.bottom >= height)) {
58        mLayer->region.clear();
59        dirty.set(0.0f, 0.0f, width, height);
60    } else {
61        dirty.intersect(0.0f, 0.0f, width, height);
62        android::Rect r(dirty.left, dirty.top, dirty.right, dirty.bottom);
63        mLayer->region.subtractSelf(r);
64    }
65
66    return OpenGLRenderer::prepareDirty(dirty.left, dirty.top, dirty.right, dirty.bottom, opaque);
67}
68
69status_t LayerRenderer::clear(float left, float top, float right, float bottom, bool opaque) {
70    if (mLayer->isDirty()) {
71        getCaches().disableScissor();
72        glClear(GL_COLOR_BUFFER_BIT);
73
74        getCaches().resetScissor();
75        mLayer->setDirty(false);
76
77        return DrawGlInfo::kStatusDone;
78    }
79
80    return OpenGLRenderer::clear(left, top, right, bottom, opaque);
81}
82
83void LayerRenderer::finish() {
84    OpenGLRenderer::finish();
85
86    generateMesh();
87
88    LAYER_RENDERER_LOGD("Finished rendering into layer, fbo = %d", mLayer->getFbo());
89
90    // No need to unbind our FBO, this will be taken care of by the caller
91    // who will invoke OpenGLRenderer::resume()
92}
93
94GLint LayerRenderer::getTargetFbo() {
95    return mLayer->getFbo();
96}
97
98bool LayerRenderer::suppressErrorChecks() {
99    return true;
100}
101
102///////////////////////////////////////////////////////////////////////////////
103// Layer support
104///////////////////////////////////////////////////////////////////////////////
105
106bool LayerRenderer::hasLayer() {
107    return true;
108}
109
110void LayerRenderer::ensureStencilBuffer() {
111    attachStencilBufferToLayer(mLayer);
112}
113
114///////////////////////////////////////////////////////////////////////////////
115// Dirty region tracking
116///////////////////////////////////////////////////////////////////////////////
117
118Region* LayerRenderer::getRegion() {
119    if (getSnapshot()->flags & Snapshot::kFlagFboTarget) {
120        return OpenGLRenderer::getRegion();
121    }
122    return &mLayer->region;
123}
124
125// TODO: This implementation is flawed and can generate T-junctions
126//       in the mesh, which will in turn produce cracks when the
127//       mesh is rotated/skewed. The easiest way to fix this would
128//       be, for each row, to add new vertices shared with the previous
129//       row when the two rows share an edge.
130//       In practice, T-junctions do not appear often so this has yet
131//       to be fixed.
132void LayerRenderer::generateMesh() {
133    if (mLayer->region.isRect() || mLayer->region.isEmpty()) {
134        if (mLayer->mesh) {
135            delete mLayer->mesh;
136            delete mLayer->meshIndices;
137
138            mLayer->mesh = NULL;
139            mLayer->meshIndices = NULL;
140            mLayer->meshElementCount = 0;
141        }
142
143        mLayer->setRegionAsRect();
144        return;
145    }
146
147    size_t count;
148    const android::Rect* rects = mLayer->region.getArray(&count);
149
150    GLsizei elementCount = count * 6;
151
152    if (mLayer->mesh && mLayer->meshElementCount < elementCount) {
153        delete mLayer->mesh;
154        delete mLayer->meshIndices;
155
156        mLayer->mesh = NULL;
157        mLayer->meshIndices = NULL;
158    }
159
160    bool rebuildIndices = false;
161    if (!mLayer->mesh) {
162        mLayer->mesh = new TextureVertex[count * 4];
163        mLayer->meshIndices = new uint16_t[elementCount];
164        rebuildIndices = true;
165    }
166    mLayer->meshElementCount = elementCount;
167
168    const float texX = 1.0f / float(mLayer->getWidth());
169    const float texY = 1.0f / float(mLayer->getHeight());
170    const float height = mLayer->layer.getHeight();
171
172    TextureVertex* mesh = mLayer->mesh;
173    uint16_t* indices = mLayer->meshIndices;
174
175    for (size_t i = 0; i < count; i++) {
176        const android::Rect* r = &rects[i];
177
178        const float u1 = r->left * texX;
179        const float v1 = (height - r->top) * texY;
180        const float u2 = r->right * texX;
181        const float v2 = (height - r->bottom) * texY;
182
183        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
184        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
185        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
186        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
187
188        if (rebuildIndices) {
189            uint16_t quad = i * 4;
190            int index = i * 6;
191            indices[index    ] = quad;       // top-left
192            indices[index + 1] = quad + 1;   // top-right
193            indices[index + 2] = quad + 2;   // bottom-left
194            indices[index + 3] = quad + 2;   // bottom-left
195            indices[index + 4] = quad + 1;   // top-right
196            indices[index + 5] = quad + 3;   // bottom-right
197        }
198    }
199}
200
201///////////////////////////////////////////////////////////////////////////////
202// Layers management
203///////////////////////////////////////////////////////////////////////////////
204
205Layer* LayerRenderer::createLayer(uint32_t width, uint32_t height, bool isOpaque) {
206    LAYER_RENDERER_LOGD("Requesting new render layer %dx%d", width, height);
207
208    Caches& caches = Caches::getInstance();
209    GLuint fbo = caches.fboCache.get();
210    if (!fbo) {
211        ALOGW("Could not obtain an FBO");
212        return NULL;
213    }
214
215    caches.activeTexture(0);
216    Layer* layer = caches.layerCache.get(width, height);
217    if (!layer) {
218        ALOGW("Could not obtain a layer");
219        return NULL;
220    }
221
222    layer->setFbo(fbo);
223    layer->layer.set(0.0f, 0.0f, width, height);
224    layer->texCoords.set(0.0f, height / float(layer->getHeight()),
225            width / float(layer->getWidth()), 0.0f);
226    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
227    layer->setBlend(!isOpaque);
228    layer->setColorFilter(NULL);
229    layer->setDirty(true);
230    layer->region.clear();
231
232    GLuint previousFbo;
233    glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
234
235    glBindFramebuffer(GL_FRAMEBUFFER, layer->getFbo());
236    layer->bindTexture();
237
238    // Initialize the texture if needed
239    if (layer->isEmpty()) {
240        layer->setEmpty(false);
241        layer->allocateTexture(GL_RGBA, GL_UNSIGNED_BYTE);
242
243        if (glGetError() != GL_NO_ERROR) {
244            ALOGD("Could not allocate texture for layer (fbo=%d %dx%d)",
245                    fbo, width, height);
246
247            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
248
249            Caches::getInstance().resourceCache.decrementRefcount(layer);
250
251            return NULL;
252        }
253    }
254
255    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
256            layer->getTexture(), 0);
257
258    glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
259
260    return layer;
261}
262
263bool LayerRenderer::resizeLayer(Layer* layer, uint32_t width, uint32_t height) {
264    if (layer) {
265        LAYER_RENDERER_LOGD("Resizing layer fbo = %d to %dx%d", layer->getFbo(), width, height);
266
267        if (layer->resize(width, height)) {
268            layer->layer.set(0.0f, 0.0f, width, height);
269            layer->texCoords.set(0.0f, height / float(layer->getHeight()),
270                    width / float(layer->getWidth()), 0.0f);
271        } else {
272            Caches::getInstance().resourceCache.decrementRefcount(layer);
273            return false;
274        }
275    }
276
277    return true;
278}
279
280Layer* LayerRenderer::createTextureLayer(bool isOpaque) {
281    LAYER_RENDERER_LOGD("Creating new texture layer");
282
283    Layer* layer = new Layer(0, 0);
284    layer->setCacheable(false);
285    layer->setTextureLayer(true);
286    layer->setBlend(!isOpaque);
287    layer->setEmpty(true);
288    layer->setFbo(0);
289    layer->setAlpha(255, SkXfermode::kSrcOver_Mode);
290    layer->layer.set(0.0f, 0.0f, 0.0f, 0.0f);
291    layer->texCoords.set(0.0f, 1.0f, 1.0f, 0.0f);
292    layer->region.clear();
293    layer->setRenderTarget(GL_NONE); // see ::updateTextureLayer()
294
295    Caches::getInstance().activeTexture(0);
296    layer->generateTexture();
297
298    return layer;
299}
300
301void LayerRenderer::updateTextureLayer(Layer* layer, uint32_t width, uint32_t height,
302        bool isOpaque, GLenum renderTarget, float* transform) {
303    if (layer) {
304        layer->setBlend(!isOpaque);
305        layer->setSize(width, height);
306        layer->layer.set(0.0f, 0.0f, width, height);
307        layer->region.set(width, height);
308        layer->regionRect.set(0.0f, 0.0f, width, height);
309        layer->getTexTransform().load(transform);
310
311        if (renderTarget != layer->getRenderTarget()) {
312            layer->setRenderTarget(renderTarget);
313            layer->bindTexture();
314            layer->setFilter(GL_NEAREST, false, true);
315            layer->setWrap(GL_CLAMP_TO_EDGE, false, true);
316        }
317    }
318}
319
320void LayerRenderer::destroyLayer(Layer* layer) {
321    if (layer) {
322        LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d",
323                layer->getWidth(), layer->getHeight(), layer->getFbo());
324
325        if (!Caches::getInstance().layerCache.put(layer)) {
326            LAYER_RENDERER_LOGD("  Destroyed!");
327            Caches::getInstance().resourceCache.decrementRefcount(layer);
328        } else {
329            LAYER_RENDERER_LOGD("  Cached!");
330#if DEBUG_LAYER_RENDERER
331            Caches::getInstance().layerCache.dump();
332#endif
333            layer->removeFbo();
334            layer->region.clear();
335        }
336    }
337}
338
339void LayerRenderer::destroyLayerDeferred(Layer* layer) {
340    if (layer) {
341        LAYER_RENDERER_LOGD("Deferring layer destruction, fbo = %d", layer->getFbo());
342
343        Caches::getInstance().deleteLayerDeferred(layer);
344    }
345}
346
347void LayerRenderer::flushLayer(Layer* layer) {
348#ifdef GL_EXT_discard_framebuffer
349    GLuint fbo = layer->getFbo();
350    if (layer && fbo) {
351        // If possible, discard any enqueud operations on deferred
352        // rendering architectures
353        if (Caches::getInstance().extensions.hasDiscardFramebuffer()) {
354            GLuint previousFbo;
355            glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
356            if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, fbo);
357
358            const GLenum attachments[] = { GL_COLOR_ATTACHMENT0 };
359            glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);
360
361            if (fbo != previousFbo) glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
362        }
363    }
364#endif
365}
366
367bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) {
368    Caches& caches = Caches::getInstance();
369    if (layer && bitmap->width() <= caches.maxTextureSize &&
370            bitmap->height() <= caches.maxTextureSize) {
371
372        GLuint fbo = caches.fboCache.get();
373        if (!fbo) {
374            ALOGW("Could not obtain an FBO");
375            return false;
376        }
377
378        SkAutoLockPixels alp(*bitmap);
379
380        GLuint texture;
381        GLuint previousFbo;
382        GLuint previousViewport[4];
383
384        GLenum format;
385        GLenum type;
386
387        GLenum error = GL_NO_ERROR;
388        bool status = false;
389
390        switch (bitmap->config()) {
391            case SkBitmap::kA8_Config:
392                format = GL_ALPHA;
393                type = GL_UNSIGNED_BYTE;
394                break;
395            case SkBitmap::kRGB_565_Config:
396                format = GL_RGB;
397                type = GL_UNSIGNED_SHORT_5_6_5;
398                break;
399            case SkBitmap::kARGB_4444_Config:
400                format = GL_RGBA;
401                type = GL_UNSIGNED_SHORT_4_4_4_4;
402                break;
403            case SkBitmap::kARGB_8888_Config:
404            default:
405                format = GL_RGBA;
406                type = GL_UNSIGNED_BYTE;
407                break;
408        }
409
410        float alpha = layer->getAlpha();
411        SkXfermode::Mode mode = layer->getMode();
412        GLuint previousLayerFbo = layer->getFbo();
413
414        layer->setAlpha(255, SkXfermode::kSrc_Mode);
415        layer->setFbo(fbo);
416
417        glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
418        glGetIntegerv(GL_VIEWPORT, (GLint*) &previousViewport);
419        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
420
421        glGenTextures(1, &texture);
422        if ((error = glGetError()) != GL_NO_ERROR) goto error;
423
424        caches.activeTexture(0);
425        glBindTexture(GL_TEXTURE_2D, texture);
426
427        glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());
428
429        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
430        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
431
432        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
433        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
434
435        glTexImage2D(GL_TEXTURE_2D, 0, format, bitmap->width(), bitmap->height(),
436                0, format, type, NULL);
437        if ((error = glGetError()) != GL_NO_ERROR) goto error;
438
439        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
440                GL_TEXTURE_2D, texture, 0);
441        if ((error = glGetError()) != GL_NO_ERROR) goto error;
442
443        {
444            LayerRenderer renderer(layer);
445            renderer.setViewport(bitmap->width(), bitmap->height());
446            renderer.OpenGLRenderer::prepareDirty(0.0f, 0.0f,
447                    bitmap->width(), bitmap->height(), !layer->isBlend());
448
449            caches.disableScissor();
450            renderer.translate(0.0f, bitmap->height());
451            renderer.scale(1.0f, -1.0f);
452
453            mat4 texTransform(layer->getTexTransform());
454
455            mat4 invert;
456            invert.translate(0.0f, 1.0f, 0.0f);
457            invert.scale(1.0f, -1.0f, 1.0f);
458            layer->getTexTransform().multiply(invert);
459
460            if ((error = glGetError()) != GL_NO_ERROR) goto error;
461
462            {
463                Rect bounds;
464                bounds.set(0.0f, 0.0f, bitmap->width(), bitmap->height());
465                renderer.drawTextureLayer(layer, bounds);
466
467                glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
468                        type, bitmap->getPixels());
469
470                if ((error = glGetError()) != GL_NO_ERROR) goto error;
471            }
472
473            layer->getTexTransform().load(texTransform);
474            status = true;
475        }
476
477error:
478#if DEBUG_OPENGL
479        if (error != GL_NO_ERROR) {
480            ALOGD("GL error while copying layer into bitmap = 0x%x", error);
481        }
482#endif
483
484        glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
485        layer->setAlpha(alpha, mode);
486        layer->setFbo(previousLayerFbo);
487        glDeleteTextures(1, &texture);
488        caches.fboCache.put(fbo);
489        glViewport(previousViewport[0], previousViewport[1],
490                previousViewport[2], previousViewport[3]);
491
492        return status;
493    }
494    return false;
495}
496
497}; // namespace uirenderer
498}; // namespace android
499