tilerenderer.cpp revision b166940edca6e312463461438e2aa66e9852c26a 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <GLES2/gl2.h>
19#include <EGL/egl.h>
20#include <gl2ext.h>
21#include <OpenGLRenderer.h>
22#include "tilerenderer.h"
23
24namespace android {
25ANDROID_SINGLETON_STATIC_INSTANCE(uirenderer::TileRenderer) ;
26namespace uirenderer {
27
28TileRenderer::TileRenderer() {
29    mIsTiled = false;
30}
31
32TileRenderer::~TileRenderer() {
33}
34
35void TileRenderer::startTileRendering(OpenGLRenderer* renderer,
36                                      int left, int top,
37                                      int right, int bottom) {
38    int width = 0;
39    int height = 0;
40    GLenum status = GL_NO_ERROR;
41
42    if (renderer != NULL) {
43        renderer->getViewport(width, height);
44    }
45
46    if (!left && !right && !top && !bottom) {
47        left = 0;
48        top = 0;
49        right = width;
50        bottom = height;
51    }
52
53    if (!left && !right && !top && !bottom) {
54        //can't do tile rendering
55        ALOGE("can't tile render; drity region, width, height not available");
56        return;
57    }
58
59    int l = left, t = (height - bottom), w = (right - left), h = (bottom - top), preserve = 0;
60
61    if (l < 0 || t < 0) {
62        l = (l < 0) ? 0 : l;
63        t = (t < 0) ? 0 : t;
64        preserve = 1;
65    }
66
67    if (w > width || h > height) {
68        w = (w > width) ? width : w;
69        h = (h > height) ? height : h;
70        preserve = 1;
71    }
72
73    //clear off all errors before tiling, if any
74    while ((status = glGetError()) != GL_NO_ERROR);
75
76    if (preserve)
77        glStartTilingQCOM(l, t, w, h, GL_COLOR_BUFFER_BIT0_QCOM);
78    else
79        glStartTilingQCOM(l, t, w, h, GL_NONE);
80
81    status = glGetError();
82    if (status == GL_NO_ERROR)
83        mIsTiled = true;
84}
85
86void TileRenderer::endTileRendering(OpenGLRenderer*) {
87    if (!mIsTiled) {
88        return;
89    }
90    glEndTilingQCOM(GL_COLOR_BUFFER_BIT0_QCOM);
91    mIsTiled = false;
92    GLenum status = GL_NO_ERROR;
93    while ((status = glGetError()) != GL_NO_ERROR);
94}
95
96}; // namespace uirenderer
97}; // namespace android
98