OpenGLRenderer.cpp revision bb9524b6bdddc7ac77d8628daa8b366b8a7be4a4 
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 <utils/Errors.h>
24#include <utils/Log.h>
25
26#include <GLES2/gl2.h>
27#include <GLES2/gl2ext.h>
28
29#include <SkXfermode.h>
30
31#include "OpenGLRenderer.h"
32#include "Matrix.h"
33
34namespace android {
35
36OpenGLRenderer::OpenGLRenderer() {
37    LOGD("Create OpenGLRenderer");
38
39    mSnapshot = new Snapshot;
40    mSaveCount = 0;
41}
42
43OpenGLRenderer::~OpenGLRenderer() {
44    LOGD("Destroy OpenGLRenderer");
45}
46
47void OpenGLRenderer::setViewport(int width, int height) {
48    glViewport(0, 0, width, height);
49
50    mat4 ortho;
51    ortho.loadOrtho(0, width, height, 0, 0, 1);
52    ortho.copyTo(mOrthoMatrix);
53
54    mWidth = width;
55    mHeight = height;
56}
57
58void OpenGLRenderer::prepare() {
59    glDisable(GL_SCISSOR_TEST);
60
61    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
62    glClear(GL_COLOR_BUFFER_BIT);
63
64    glEnable(GL_SCISSOR_TEST);
65    mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight);
66}
67
68int OpenGLRenderer::getSaveCount() const {
69	return mSaveCount;
70}
71
72int OpenGLRenderer::save(int flags) {
73	return saveSnapshot();
74}
75
76void OpenGLRenderer::restore() {
77	if (mSaveCount == 0) return;
78
79	if (restoreSnapshot()) {
80		setScissorFromClip();
81	}
82}
83
84void OpenGLRenderer::restoreToCount(int saveCount) {
85	if (saveCount <= 0 || saveCount > mSaveCount) return;
86
87	bool restoreClip = false;
88
89	while (mSaveCount != saveCount - 1) {
90		restoreClip |= restoreSnapshot();
91	}
92
93	if (restoreClip) {
94		setScissorFromClip();
95	}
96}
97
98int OpenGLRenderer::saveSnapshot() {
99	mSnapshot = new Snapshot(mSnapshot);
100	mSaveCount++;
101	return mSaveCount;
102}
103
104bool OpenGLRenderer::restoreSnapshot() {
105	// TODO: handle local transformations
106	bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;
107
108	mSaveCount--;
109	mSnapshot = mSnapshot->previous;
110
111	return restoreClip;
112}
113
114void OpenGLRenderer::setScissorFromClip() {
115	Rect clip = mSnapshot->clipRect;
116	glScissor(clip.left, clip.top, clip.getWidth(), clip.getHeight());
117}
118
119bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom) {
120	// TODO: take local translate transform into account
121	bool clipped = mSnapshot->clipRect.intersect(left, top, right, bottom);
122	if (clipped) {
123		mSnapshot->flags |= Snapshot::kFlagClipSet;
124		setScissorFromClip();
125	}
126	return clipped;
127}
128
129void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
130	LOGD("Drawing color");
131}
132
133}; // namespace android
134