1/*
2 * Copyright (C) 2015 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#include "OffscreenBufferPool.h"
18
19#include "Caches.h"
20#include "renderstate/RenderState.h"
21#include "utils/FatVector.h"
22#include "utils/TraceUtils.h"
23
24#include <utils/Color.h>
25#include <utils/Log.h>
26
27#include <GLES2/gl2.h>
28
29namespace android {
30namespace uirenderer {
31
32////////////////////////////////////////////////////////////////////////////////
33// OffscreenBuffer
34////////////////////////////////////////////////////////////////////////////////
35
36OffscreenBuffer::OffscreenBuffer(RenderState& renderState, Caches& caches, uint32_t viewportWidth,
37                                 uint32_t viewportHeight, bool wideColorGamut)
38        : GpuMemoryTracker(GpuObjectType::OffscreenBuffer)
39        , renderState(renderState)
40        , viewportWidth(viewportWidth)
41        , viewportHeight(viewportHeight)
42        , texture(caches)
43        , wideColorGamut(wideColorGamut) {
44    uint32_t width = computeIdealDimension(viewportWidth);
45    uint32_t height = computeIdealDimension(viewportHeight);
46    ATRACE_FORMAT("Allocate %ux%u HW Layer", width, height);
47    caches.textureState().activateTexture(0);
48    texture.resize(width, height, wideColorGamut ? GL_RGBA16F : caches.rgbaInternalFormat(),
49                   GL_RGBA);
50    texture.blend = true;
51    texture.setWrap(GL_CLAMP_TO_EDGE);
52    // not setting filter on texture, since it's set when drawing, based on transform
53}
54
55Rect OffscreenBuffer::getTextureCoordinates() {
56    const float texX = 1.0f / static_cast<float>(texture.width());
57    const float texY = 1.0f / static_cast<float>(texture.height());
58    return Rect(0, viewportHeight * texY, viewportWidth * texX, 0);
59}
60
61void OffscreenBuffer::dirty(Rect dirtyArea) {
62    dirtyArea.doIntersect(0, 0, viewportWidth, viewportHeight);
63    if (!dirtyArea.isEmpty()) {
64        region.orSelf(
65                android::Rect(dirtyArea.left, dirtyArea.top, dirtyArea.right, dirtyArea.bottom));
66    }
67}
68
69void OffscreenBuffer::updateMeshFromRegion() {
70    // avoid T-junctions as they cause artifacts in between the resultant
71    // geometry when complex transforms occur.
72    // TODO: generate the safeRegion only if necessary based on drawing transform
73    Region safeRegion = Region::createTJunctionFreeRegion(region);
74
75    size_t count;
76    const android::Rect* rects = safeRegion.getArray(&count);
77
78    const float texX = 1.0f / float(texture.width());
79    const float texY = 1.0f / float(texture.height());
80
81    FatVector<TextureVertex, 64> meshVector(count *
82                                            4);  // uses heap if more than 64 vertices needed
83    TextureVertex* mesh = &meshVector[0];
84    for (size_t i = 0; i < count; i++) {
85        const android::Rect* r = &rects[i];
86
87        const float u1 = r->left * texX;
88        const float v1 = (viewportHeight - r->top) * texY;
89        const float u2 = r->right * texX;
90        const float v2 = (viewportHeight - r->bottom) * texY;
91
92        TextureVertex::set(mesh++, r->left, r->top, u1, v1);
93        TextureVertex::set(mesh++, r->right, r->top, u2, v1);
94        TextureVertex::set(mesh++, r->left, r->bottom, u1, v2);
95        TextureVertex::set(mesh++, r->right, r->bottom, u2, v2);
96    }
97    elementCount = count * 6;
98    renderState.meshState().genOrUpdateMeshBuffer(
99            &vbo, sizeof(TextureVertex) * count * 4, &meshVector[0],
100            GL_DYNAMIC_DRAW);  // TODO: GL_STATIC_DRAW if savelayer
101}
102
103uint32_t OffscreenBuffer::computeIdealDimension(uint32_t dimension) {
104    return uint32_t(ceilf(dimension / float(LAYER_SIZE)) * LAYER_SIZE);
105}
106
107OffscreenBuffer::~OffscreenBuffer() {
108    ATRACE_FORMAT("Destroy %ux%u HW Layer", texture.width(), texture.height());
109    texture.deleteTexture();
110    renderState.meshState().deleteMeshBuffer(vbo);
111    elementCount = 0;
112    vbo = 0;
113}
114
115///////////////////////////////////////////////////////////////////////////////
116// OffscreenBufferPool
117///////////////////////////////////////////////////////////////////////////////
118
119OffscreenBufferPool::OffscreenBufferPool()
120        // 4 screen-sized RGBA_8888 textures
121        : mMaxSize(DeviceInfo::multiplyByResolution(4 * 4)) {}
122
123OffscreenBufferPool::~OffscreenBufferPool() {
124    clear();  // TODO: unique_ptr?
125}
126
127int OffscreenBufferPool::Entry::compare(const Entry& lhs, const Entry& rhs) {
128    int deltaInt = int(lhs.width) - int(rhs.width);
129    if (deltaInt != 0) return deltaInt;
130
131    deltaInt = int(lhs.height) - int(rhs.height);
132    if (deltaInt != 0) return deltaInt;
133
134    return int(lhs.wideColorGamut) - int(rhs.wideColorGamut);
135}
136
137void OffscreenBufferPool::clear() {
138    for (auto& entry : mPool) {
139        delete entry.layer;
140    }
141    mPool.clear();
142    mSize = 0;
143}
144
145OffscreenBuffer* OffscreenBufferPool::get(RenderState& renderState, const uint32_t width,
146                                          const uint32_t height, bool wideColorGamut) {
147    OffscreenBuffer* layer = nullptr;
148
149    Entry entry(width, height, wideColorGamut);
150    auto iter = mPool.find(entry);
151
152    if (iter != mPool.end()) {
153        entry = *iter;
154        mPool.erase(iter);
155
156        layer = entry.layer;
157        layer->viewportWidth = width;
158        layer->viewportHeight = height;
159        mSize -= layer->getSizeInBytes();
160    } else {
161        layer = new OffscreenBuffer(renderState, Caches::getInstance(), width, height,
162                                    wideColorGamut);
163    }
164
165    return layer;
166}
167
168OffscreenBuffer* OffscreenBufferPool::resize(OffscreenBuffer* layer, const uint32_t width,
169                                             const uint32_t height) {
170    RenderState& renderState = layer->renderState;
171    if (layer->texture.width() == OffscreenBuffer::computeIdealDimension(width) &&
172        layer->texture.height() == OffscreenBuffer::computeIdealDimension(height)) {
173        // resize in place
174        layer->viewportWidth = width;
175        layer->viewportHeight = height;
176
177        // entire area will be repainted (and may be smaller) so clear usage region
178        layer->region.clear();
179        return layer;
180    }
181    bool wideColorGamut = layer->wideColorGamut;
182    putOrDelete(layer);
183    return get(renderState, width, height, wideColorGamut);
184}
185
186void OffscreenBufferPool::dump() {
187    for (auto entry : mPool) {
188        ALOGD("  Layer size %dx%d", entry.width, entry.height);
189    }
190}
191
192void OffscreenBufferPool::putOrDelete(OffscreenBuffer* layer) {
193    const uint32_t size = layer->getSizeInBytes();
194    // Don't even try to cache a layer that's bigger than the cache
195    if (size < mMaxSize) {
196        // TODO: Use an LRU
197        while (mSize + size > mMaxSize) {
198            OffscreenBuffer* victim = mPool.begin()->layer;
199            mSize -= victim->getSizeInBytes();
200            delete victim;
201            mPool.erase(mPool.begin());
202        }
203
204        // clear region, since it's no longer valid
205        layer->region.clear();
206
207        Entry entry(layer);
208
209        mPool.insert(entry);
210        mSize += size;
211    } else {
212        delete layer;
213    }
214}
215
216};  // namespace uirenderer
217};  // namespace android
218