1 /*
2 * Copyright (C) 2023 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_NDEBUG 0
18 #define LOG_TAG "EglFramebuffer"
19 #include "EglFramebuffer.h"
20
21 #include "EGL/eglext.h"
22 #include "EglUtil.h"
23 #include "GLES/gl.h"
24 #include "GLES2/gl2.h"
25 #include "GLES2/gl2ext.h"
26 #include "android/hardware_buffer.h"
27 #include "log/log.h"
28
29 namespace android {
30 namespace companion {
31 namespace virtualcamera {
32
EglFrameBuffer(EGLDisplay display,std::shared_ptr<AHardwareBuffer> hwBuffer)33 EglFrameBuffer::EglFrameBuffer(EGLDisplay display,
34 std::shared_ptr<AHardwareBuffer> hwBuffer)
35 : mHardwareBuffer(hwBuffer), mEglDisplay(display) {
36 if (hwBuffer == nullptr) {
37 ALOGE("Cannot construct EglFramebuffer from null hwBuffer");
38 return;
39 }
40
41 AHardwareBuffer_Desc hwBufferDesc;
42 AHardwareBuffer_describe(hwBuffer.get(), &hwBufferDesc);
43 mWidth = hwBufferDesc.width;
44 mHeight = hwBufferDesc.height;
45
46 EGLClientBuffer clientBuffer = eglGetNativeClientBufferANDROID(hwBuffer.get());
47 mEglImageKhr = eglCreateImageKHR(display, EGL_NO_CONTEXT,
48 EGL_NATIVE_BUFFER_ANDROID, clientBuffer, 0);
49 if (checkEglError("eglCreateImageKHR")) {
50 return;
51 }
52
53 // Create texture backed by the hardware buffer.
54 glGenTextures(1, &mTextureId);
55 glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTextureId);
56 glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES,
57 (GLeglImageOES)mEglImageKhr);
58 if (checkEglError("configure external texture")) {
59 return;
60 }
61
62 // Create framebuffer backed by the texture.
63 glGenFramebuffers(1, &mFramebufferId);
64 glBindFramebuffer(GL_FRAMEBUFFER, mFramebufferId);
65 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
66 GL_TEXTURE_EXTERNAL_OES, mTextureId, 0);
67 GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
68 if (status != GL_FRAMEBUFFER_COMPLETE) {
69 ALOGE("Failed to configure framebuffer for texture");
70 return; // false;
71 }
72 if (checkEglError("glCheckFramebufferStatus")) {
73 return; // false;
74 }
75 }
76
~EglFrameBuffer()77 EglFrameBuffer::~EglFrameBuffer() {
78 if (mFramebufferId != 0) {
79 glDeleteFramebuffers(1, &mFramebufferId);
80 }
81 if (mTextureId != 0) {
82 glDeleteTextures(1, &mTextureId);
83 }
84 if (mEglImageKhr != EGL_NO_IMAGE_KHR) {
85 eglDestroyImageKHR(mEglDisplay, mEglDisplay);
86 }
87 }
88
beforeDraw()89 bool EglFrameBuffer::beforeDraw() {
90 glBindFramebuffer(GL_FRAMEBUFFER, mFramebufferId);
91 if (checkEglError("glBindFramebuffer")) {
92 return false;
93 }
94
95 glViewport(0, 0, mWidth, mHeight);
96
97 return true;
98 }
99
afterDraw()100 bool EglFrameBuffer::afterDraw() {
101 glFinish();
102 glBindFramebuffer(GL_FRAMEBUFFER, 0);
103 glBindTexture(GL_TEXTURE_EXTERNAL_OES, 0);
104 return true;
105 }
106
getWidth() const107 int EglFrameBuffer::getWidth() const {
108 return mWidth;
109 }
110
getHeight() const111 int EglFrameBuffer::getHeight() const {
112 return mHeight;
113 }
114
getHardwareBuffer()115 std::shared_ptr<AHardwareBuffer> EglFrameBuffer::getHardwareBuffer() {
116 return mHardwareBuffer;
117 }
118
119 } // namespace virtualcamera
120 } // namespace companion
121 } // namespace android
122