OpenGL ES _ 入門_01
OpenGL ES _ 入門_02
OpenGL ES _ 入門_03
OpenGL ES _ 入門_04
OpenGL ES _ 入門_05
OpenGL ES _ 入門練習_01
OpenGL ES _ 入門練習_02
OpenGL ES _ 入門練習_03
OpenGL ES _ 入門練習_04
OpenGL ES _ 入門練習_05
OpenGL ES _ 入門練習_06
OpenGL ES _ 著色器 _ 介紹
OpenGL ES _ 著色器 _ 程序
OpenGL ES _ 著色器 _ 語法
OpenGL ES_著色器_紋理圖像
OpenGL ES_著色器_預處理
OpenGL ES_著色器_頂點著色器詳解
OpenGL ES_著色器_片斷著色器詳解
OpenGL ES_著色器_實戰(zhàn)01
OpenGL ES_著色器_實戰(zhàn)02
OpenGL ES_著色器_實戰(zhàn)03

讓學習成為一種習慣
實戰(zhàn)2中，詳細介紹了多屏顯示的原理和實現(xiàn)過程,今天我們繼續(xù)我們的OpenGL 旅程！技術(shù)再牛逼也要學習!

學習是一件開心的額事情

學習目標

打造全景視頻，以及VR 眼鏡專用的雙屏顯示框架!

你應(yīng)該知道的

網(wǎng)絡(luò)截圖

• 全景顯示的原理
  通俗的將，好比紅色區(qū)域就是你的手機屏幕，當你旋轉(zhuǎn)手機的時候，我們球體向相反的方向旋轉(zhuǎn)，這樣，你就可以看到球體上的畫面了.

準備工作

找一個全景視頻，添加到項目中去。

• 實現(xiàn)步驟
  1.創(chuàng)建一個球體模型
  2.獲取視頻數(shù)據(jù)的每一幀數(shù)據(jù) 轉(zhuǎn)換成RGB 格式，渲染到球體上
  3.通過手勢的變換，改變球體模型視圖矩陣值
  4.如果是VR模式,則通過角度傳感器獲取用戶的行為，調(diào)整視圖矩陣。

實現(xiàn)了那些功能

• 支持普通視頻播放
• 支持全景視頻播放
• 支持VR 雙屏顯示模式
• 支持快進，快退
• 支持播放，暫停
• 支持暫停廣告功能

核心代碼講解

如果你想要和我一樣,能夠從零開始把代碼敲出來，請確保自己有OpenGL ES 2.0 的基礎(chǔ)知識 和 GLSL 的簡單基本知識，如果你不具備這方面的知識，沒關(guān)系，我已經(jīng)寫好了OpenGL學習教程和GLSL教程,請移步開始學習。下面開始我們的內(nèi)容講解.

• 視頻采集

<p>工程中的兩個文件 XJVRPlayerViewController.h和XJVRPlayerController.m主要負責視頻數(shù)據(jù)采集,界面布局在XJVRPlayerViewController中可以更改,主要使用AVFoundation框架這部分內(nèi)容今天咱不講解,后面我會寫關(guān)于視頻采集的教程</p>

• 模型創(chuàng)建
  a.全景播放器生成球體的頂點坐標和紋理坐標
  b.普通播放器生成長方形的頂點坐標和紋理坐標
  兩個生成函數(shù)在OSShere.h中

• 將數(shù)據(jù)加載到GPU中去

  // 加載頂點索引數(shù)據(jù)glGenBuffers(1, &_indexBuffer);glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);glBufferData(GL_ELEMENT_ARRAY_BUFFER, _numIndices*sizeof(GLushort), _indices, GL_STATIC_DRAW);// 加載頂點坐標 glGenBuffers(1, &_vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); glBufferData(GL_ARRAY_BUFFER, numVertices*strideNum*sizeof(GLfloat), _vertices, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, strideNum, GL_FLOAT, GL_FALSE, strideNum*sizeof(GLfloat), NULL);//加載紋理坐標 glGenBuffers(1, &_textureCoordBuffer); glBindBuffer(GL_ARRAY_BUFFER, _textureCoordBuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat)*2*numVertices, _texCoords, GL_DYNAMIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 2*sizeof(GLfloat), NULL);

以上函數(shù)的具體用法，在之前的教程中都講過,這里就不贅述了。

• 著色器程序
  我把著色器分為兩種類型，一種是渲染全景視頻的，一種是渲染普通視頻的，兩個沒有多大區(qū)別，只是在全景著色器中添加了一個視圖轉(zhuǎn)換矩陣 (全景著色器:ShadePanorama,普通著色器:ShaderNormal)
  下面給出的是全景的著色器的代碼:
  a.頂點著色器

  attribute vec4 position; // 頂點坐標屬性 attribute vec2 texCoord0;// 紋理坐標 varying vec2 texCoordVarying;// 片段著色器輸入變量,負責獲取紋理坐標的值 uniform mat4 modelViewProjectionMatrix;//視圖變換矩陣 void main (){ texCoordVarying = texCoord0; gl_Position = modelViewProjectionMatrix*position; }

b.片段著色器

precision mediump float;//設(shè)置float精度varying vec2 texCoordVarying;uniform sampler2D sam2DY; // 紋理采樣器Yuniform sampler2D sam2DUV;// 紋理采樣器UVvoid main(){mediump vec3 yuv;lowp vec3 rob;// YUV 轉(zhuǎn)RGB 的轉(zhuǎn)換矩陣 mediump mat3 convert = mat3(1.164, 1.164, 1.164,0.0, -0.213, 2.112,1.793, -0.533, 0.0);yuv.x = texture2D(sam2DY,texCoordVarying).r - (16.0/255.0);yuv.yz = texture2D(sam2DUV,texCoordVarying).rg - vec2(0.5, 0.5);rgb = convert*yuv;gl_FragColor = vec4(rgb,1);}

如果想要了解更多關(guān)于著色器語言的知識，請猛戳我

• 創(chuàng)建著色器程序
  創(chuàng)建著色器程序的目的是編譯剛才我們編寫好的著色器源代碼，以及將著色器的變量和我們的應(yīng)用程序代碼相關(guān)聯(lián)

  /*** 創(chuàng)建編譯shader程序** @param vshName 頂點著色器文件名稱* @param fshName 片段著色器文件名稱*/-(void)createShaderProgramVertexShaderName: (NSString*)vshName FragmentShaderName: (NSString*)fshName{self.shaderManager = [[OSShaderManager alloc]init];// 編譯連個shader 文件GLuint vertexShader,fragmentShader;NSURL *vertexShaderPath = [[NSBundle mainBundle]URLForResource:vshName withExtension:@"vsh"];NSURL *fragmentShaderPath = [[NSBundle mainBundle]URLForResource:fshName withExtension:@"fsh"];if (![self.shaderManager compileShader:&vertexShader type:GL_VERTEX_SHADER URL:vertexShaderPath]||! [self.shaderManager compileShader:&fragmentShader type:GL_FRAGMENT_SHADER URL:fragmentShaderPath]){return ;}// 注意獲取綁定屬性要在連接程序之前 location 隨便你寫,如果你隨便寫請記住他，后面要用到[self.shaderManager bindAttribLocation:GLKVertexAttribPosition andAttribName:"position"];[self.shaderManager bindAttribLocation:GLKVertexAttribTexCoord0 andAttribName:"texCoord0"];// 將編譯好的兩個對象和著色器程序進行連接if(![self.shaderManager linkProgram]){[self.shaderManager deleteShader:&vertexShader];[self.shaderManager deleteShader:&fragmentShader];}_textureBufferY = [self.shaderManager getUniformLocation:"sam2DY"];_textureBufferUV = [self.shaderManager getUniformLocation:"sam2DUV"];_modelViewProjectionMatrixIndex = [self.shaderManager getUniformLocation:"modelViewProjectionMatrix"];[self.shaderManager detachAndDeleteShader:&vertexShader];[self.shaderManager detachAndDeleteShader:&fragmentShader];// 啟用著色器[self.shaderManager useProgram];}

// 上面的OSShaderManager 這個類，我把著色器程序編譯鏈接的一些方法簡單的封裝了一下,具體的方向看下面

/*** 編譯shader程序* @param shader shader名稱* @param type shader 類型* @param URL shader 本地路徑* @return 是否編譯成功*/- (BOOL)compileShader:(GLuint *)shader type:(GLenum)type URL:(NSURL *)URL;/*** 連接程序* @return 連接程序是否成功*/- (BOOL)linkProgram;/*** 驗證程序是否成功* @param prog 程序標示* @return 返回是否成功標志*/- (BOOL)validateProgram;/*** 綁定著色器的屬性* @param index 屬性在shader 程序的索引位置* @param name 屬性名稱*/- (void)bindAttribLocation:(GLuint)index andAttribName: (GLchar*)name;/*** 刪除shader*/- (void)deleteShader:(GLuint*)shader;/*** 獲取屬性值索引位置* @param name 屬性名稱* @return 返回索引位置*/- (GLint)getUniformLocation:(const GLchar*) name;/*** 釋放, 刪除shader* @param shader 著色器名稱*/-(void)detachAndDeleteShader:(GLuint*)shader;/*** 使用程序*/-(void)useProgram;

方法的具體實現(xiàn)請閱讀工程文件

• 紋理采樣器指向

  glUniform1i(_textureBufferY, 0); // 0 代表GL_TEXTURE0 glUniform1i(_textureBufferUV, 1); // 1 代表GL_TEXTURE1

在這里我有必要提醒你，這兩個方法，一定要放在著色器程序鏈接成功之后，不然你調(diào)用這個兩個方法，沒有效果。

• 如何將YUV 數(shù)據(jù)分離，并且加載到兩個著色器中去, 這里我們又要用到之前我們使用過的框架了CoreVideo. 干涉么的呢，專門處理我們的像素數(shù)據(jù)的。我們從視頻采集到的視頻是CVPixelBufferRef 類型的
  下面我們先看一下我們像素數(shù)據(jù)的格式

  <CVPixelBuffer 0x7fa27962c9c0 width=2048 height=1024 pixelFormat=420v iosurface=0x0 planes=2><Plane 0 width=2048 height=1024 bytesPerRow=2048><Plane 1 width=1024 height=512 bytesPerRow=2048><attributes=<CFBasicHash 0x7fa279623910 [0x10296ba40]>{type = immutable dict, count = 4,entries => 1 : <CFString 0x102d183b8 [0x10296ba40]>{contents = "PixelFormatType"} = <CFArray 0x7fa27c414bc0 [0x10296ba40]>{type = mutable-small, count = 1, values = ( 0 : <CFNumber 0xb000000343230763 [0x10296ba40]>{value = +875704438, type = kCFNumberSInt64Type} )} 2 : <CFString 0x102d17e78 [0x10296ba40]>{contents = "Height"} = <CFNumber 0xb000000000004002 [0x10296ba40]>{value = +1024, type = kCFNumberSInt32Type} 5 : <CFString 0x102d17d38 [0x10296ba40]>{contents = "PropagatedAttachments"} = <CFBasicHash 0x7fa27c51c590 [0x10296ba40]>{type = mutable dict, count = 4,entries => 0 : <CFString 0x102d18058 [0x10296ba40]>{contents = "CVImageBufferYCbCrMatrix"} = <CFString 0x102d18098 [0x10296ba40]>{contents = "ITU_R_601_4"} 1 : <CFString 0x102d181b8 [0x10296ba40]>{contents = "CVImageBufferTransferFunction"} = <CFString 0x102d18078 [0x10296ba40]>{contents = "ITU_R_709_2"} 2 : <CFString 0x106eadc88 [0x10296ba40]>{contents = "ColorInfoGuessedBy"} = <CFString 0x106eadca8 [0x10296ba40]>{contents = "VideoToolbox"} 5 : <CFString 0x102d18138 [0x10296ba40]>{contents = "CVImageBufferColorPrimaries"} = <CFString 0x102d18178 [0x10296ba40]>{contents = "SMPTE_C"}} 6 : <CFString 0x102d17e58 [0x10296ba40]>{contents = "Width"} = <CFNumber 0xb000000000008002 [0x10296ba40]>{value = +2048, type = kCFNumberSInt32Type}}propagatedAttachments=<CFBasicHash 0x7fa27962caa0 [0x10296ba40]>{type = mutable dict, count = 10,entries => 0 : <CFString 0x106eadc88 [0x10296ba40]>{contents = "ColorInfoGuessedBy"} = <CFString 0x106eadca8 [0x10296ba40]>{contents = "VideoToolbox"} 1 : <CFString 0x102d18058 [0x10296ba40]>{contents = "CVImageBufferYCbCrMatrix"} = <CFString 0x102d18098 [0x10296ba40]>{contents = "ITU_R_601_4"} 2 : <CFString 0x102d17ed8 [0x10296ba40]>{contents = "CVFieldCount"} = <CFNumber 0xb000000000000012 [0x10296ba40]>{value = +1, type = kCFNumberSInt32Type} 3 : <CFString 0x102d17f98 [0x10296ba40]>{contents = "CVPixelAspectRatio"} = <CFBasicHash 0x7fa279728c10 [0x10296ba40]>{type = immutable dict, count = 2,entries => 1 : <CFString 0x102d17fb8 [0x10296ba40]>{contents = "HorizontalSpacing"} = <CFNumber 0xb000000000000012 [0x10296ba40]>{value = +1, type = kCFNumberSInt32Type} 2 : <CFString 0x102d17fd8 [0x10296ba40]>{contents = "VerticalSpacing"} = <CFNumber 0xb000000000000012 [0x10296ba40]>{value = +1, type = kCFNumberSInt32Type}} 4 : <CFString 0x102d17d78 [0x10296ba40]>{contents = "QTMovieTime"} = <CFBasicHash 0x7fa27c51db40 [0x10296ba40]>{type = immutable dict, count = 2,entries => 0 : <CFString 0x102d17d98 [0x10296ba40]>{contents = "TimeValue"} = <CFNumber 0xb000000000000003 [0x10296ba40]>{value = +0, type = kCFNumberSInt64Type} 1 : <CFString 0x102d17db8 [0x10296ba40]>{contents = "TimeScale"} = <CFNumber 0xb000000000075302 [0x10296ba40]>{value = +30000, type = kCFNumberSInt32Type}} 5 : <CFString 0x102d18138 [0x10296ba40]>{contents = "CVImageBufferColorPrimaries"} = <CFString 0x102d18178 [0x10296ba40]>{contents = "SMPTE_C"} 8 : <CFString 0x102d181b8 [0x10296ba40]>{contents = "CVImageBufferTransferFunction"} = <CFString 0x102d18078 [0x10296ba40]>{contents = "ITU_R_709_2"} 9 : <CFString 0x102d18318 [0x10296ba40]>{contents = "CVImageBufferChromaSubsampling"} = <CFString 0x102d18278 [0x10296ba40]>{contents = "TopLeft"} 10 : <CFString 0x102d18218 [0x10296ba40]>{contents = "CVImageBufferChromaLocationBottomField"} = <CFString 0x102d18338 [0x10296ba40]>{contents = "4:2:0"} 12 : <CFString 0x102d181f8 [0x10296ba40]>{contents = "CVImageBufferChromaLocationTopField"} = <CFString 0x102d18338 [0x10296ba40]>{contents = "4:2:0"}}nonPropagatedAttachments=<CFBasicHash 0x7fa27962ca60 [0x10296ba40]>{type = mutable dict, count = 0,entries => } >

我們從上面的日志輸出找到了下面的東西

<CVPixelBuffer 0x7fa27962c9c0 width=2048 height=1024 pixelFormat=420v iosurface=0x0 planes=2><Plane 0 width=2048 height=1024 bytesPerRow=2048><Plane 1 width=1024 height=512 bytesPerRow=2048>

我們能得到的信息是:
像素格式: 420v
數(shù)據(jù)通道: 2 個
通道1: width=2048 height=1024
通道2: width=1024 height=512

從上面信息可以得出我們數(shù)據(jù)的排列方式為YY....YY....UV.....UV,
2048\1024 個Y 數(shù)據(jù)，1024\512 從 bytesPerRow 可以看出每個Y、U、V 各占一個字節(jié).
接下來就是如何將數(shù)據(jù)加載到我們的紋理緩沖區(qū)去了

CVReturn CVOpenGLESTextureCacheCreateTextureFromImage( CFAllocatorRef CV_NULLABLE allocator, CVOpenGLESTextureCacheRef CV_NONNULL textureCache, CVImageBufferRef CV_NONNULL sourceImage, CFDictionaryRef CV_NULLABLE textureAttributes, GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLenum format, GLenum type, size_t planeIndex, CV_RETURNS_RETAINED_PARAMETER CVOpenGLESTextureRef CV_NULLABLE * CV_NONNULL textureOut )

這個函數(shù)作用是: 通過CVImageBufferRef 創(chuàng)建一個紋理對象
allocator : 寫默認值就可以了 kCFAllocatorDefault
textureCache：我們需要手動創(chuàng)建一個紋理緩沖對象,
sourceImage：傳我們的CVImageBufferRef 數(shù)據(jù)
textureAttributes：紋理屬性，可以為NULL
target:紋理的類型(GL_TEXTURE_2D 和GL_RENDERBUFFER)
internalFormat:數(shù)據(jù)格式,就是這個數(shù)據(jù)步伐的意思
width：紋理的高度
height : 紋理的長度
format: 像素數(shù)據(jù)的格式
type: 數(shù)據(jù)類型
planeIndex: 通道索引

接下來看我們的代碼:

// 啟用紋理緩沖區(qū)0 glActiveTexture(GL_TEXTURE0); err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault,_videoTextureCache,pixelBuffer,NULL,GL_TEXTURE_2D,GL_RED_EXT,width,height,GL_RED_EXT,GL_UNSIGNED_BYTE,0,&_lumaTexture); if (err) {NSLog(@"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);}glBindTexture(CVOpenGLESTextureGetTarget(_lumaTexture), CVOpenGLESTextureGetName(_lumaTexture)); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);// UV-plane. // 啟用紋理緩沖區(qū)1 glActiveTexture(GL_TEXTURE1); err = CVOpenGLESTextureCacheCreateTextureFromImage(kCFAllocatorDefault,_videoTextureCache,pixelBuffer,NULL,GL_TEXTURE_2D,GL_RG_EXT,width /2,height /2,GL_RG_EXT,GL_UNSIGNED_BYTE,1,&_chromaTexture); if (err) {NSLog(@"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err); }glBindTexture(CVOpenGLESTextureGetTarget(_chromaTexture), CVOpenGLESTextureGetName(_chromaTexture)); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

GL_RED_EXT 代表 1位數(shù)據(jù) GL_RG_EXT 代表2位數(shù)據(jù) 。UV 就是兩位數(shù)據(jù) 所以我們選擇GL_RG_EXT。

剛才說了，參數(shù)中需要一個紋理緩沖TextureCacha,接下來我們就自己創(chuàng)建一個.

CVReturn err = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, NULL, self.eagContext, NULL, &_videoTextureCache);

以上基本的工作都做完了，接下來，我們就只剩下顯示了

• 渲染繪制

  // 清除顏色緩沖區(qū)glClearColor(0, 0, 0, 1);glClear(GL_COLOR_BUFFER_BIT);if (_isVR){// 渲染雙屏glViewport(0, 0, self.view.bounds.size.width, self.view.bounds.size.height*2);glDrawElements(GL_TRIANGLES, _numIndices, GL_UNSIGNED_SHORT, 0);glViewport(self.view.bounds.size.width, 0, self.view.bounds.size.width, self.view.bounds.size.height*2);glDrawElements(GL_TRIANGLES, _numIndices, GL_UNSIGNED_SHORT, 0);}else{// 渲染單屏glViewport(0, 0, self.view.bounds.size.width*2, self.view.bounds.size.height*2);glDrawElements(GL_TRIANGLES, _numIndices, GL_UNSIGNED_SHORT, 0);}

到這里,視頻已經(jīng)可以顯示了。

• 視圖矩陣初始化

  -(void)initModelViewProjectMatrix{ // 創(chuàng)建投影矩陣 float aspect = fabs(self.view.bounds.size.width / self.view.bounds.size.height); _projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(OSVIEW_CORNER), aspect, 0.1f, 400.0f); _projectionMatrix = GLKMatrix4Rotate(_projectionMatrix, ES_PI, 1.0f, 0.0f, 0.0f);// 創(chuàng)建模型矩陣 _modelViewMatrix = GLKMatrix4Identity; float scale = OSSphereScale; _modelViewMatrix = GLKMatrix4Scale(_modelViewMatrix, scale, scale, scale);// 最終傳入到GLSL中去的矩陣 _modelViewProjectionMatrix = GLKMatrix4Multiply(_projectionMatrix, _modelViewMatrix); glUniformMatrix4fv(_modelViewProjectionMatrixIndex, 1, GL_FALSE, _modelViewProjectionMatrix.m); }

• 全景單屏模式
  手勢操縱矩陣

  - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { if(self.isVR || self.vedioType == OSNormal ) return; UITouch *touch = [touches anyObject]; float distX = [touch locationInView:touch.view].x - [touch previousLocationInView:touch.view].x; float distY = [touch locationInView:touch.view].y - [touch previousLocationInView:touch.view].y; distX *= -0.005; distY *= -0.005; self.fingerRotationX += distY * OSVIEW_CORNER / 100; self.fingerRotationY -= distX * OSVIEW_CORNER / 100; _modelViewMatrix = GLKMatrix4Identity; float scale = OSSphereScale; _modelViewMatrix = GLKMatrix4Scale(_modelViewMatrix, scale, scale, scale); _modelViewMatrix = GLKMatrix4RotateX(_modelViewMatrix, self.fingerRotationX); _modelViewMatrix = GLKMatrix4RotateY(_modelViewMatrix, self.fingerRotationY); _modelViewProjectionMatrix = GLKMatrix4Multiply(_projectionMatrix, _modelViewMatrix); glUniformMatrix4fv(_modelViewProjectionMatrixIndex, 1, GL_FALSE, _modelViewProjectionMatrix.m); }- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {if (self.isVR || self.vedioType == OSNormal) return;for (UITouch *touch in touches) {[self.currentTouches removeObject:touch];} } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { for (UITouch *touch in touches) {[self.currentTouches removeObject:touch]; } }

• 全景 VR模式
  使用角度傳感器

  -(void)startMotionManager{ self.motionManager = [[CMMotionManager alloc]init]; self.motionManager.deviceMotionUpdateInterval = 1.0 / 60.0; self.motionManager.gyroUpdateInterval = 1.0f / 60; self.motionManager.showsDeviceMovementDisplay = YES; [self.motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXArbitraryCorrectedZVertical]; self.referenceAttitude = nil; [self.motionManager startGyroUpdatesToQueue: [[NSOperationQueue alloc]init] withHandler:^(CMGyroData * _Nullable gyroData, NSError * _Nullable error) {if(self.isVR) {[self calculateModelViewProjectMatrixWithDeviceMotion:self.motionManager.deviceMotion];}}]; self.referenceAttitude = self.motionManager.deviceMotion.attitude; } -(void)calculateModelViewProjectMatrixWithDeviceMotion:(CMDeviceMotion*)deviceMotion{_modelViewMatrix = GLKMatrix4Identity; float scale = OSSphereScale; _modelViewMatrix = GLKMatrix4Scale(_modelViewMatrix, scale, scale, scale);if (deviceMotion != nil) {CMAttitude *attitude = deviceMotion.attitude;if (self.referenceAttitude != nil) {[attitude multiplyByInverseOfAttitude:self.referenceAttitude];} else {self.referenceAttitude = deviceMotion.attitude;}float cRoll = attitude.roll;float cPitch = attitude.pitch;_modelViewMatrix = GLKMatrix4RotateX(_modelViewMatrix, -cRoll);_modelViewMatrix = GLKMatrix4RotateY(_modelViewMatrix, -cPitch*3);_modelViewProjectionMatrix = GLKMatrix4Multiply(_projectionMatrix, _modelViewMatrix);// 下邊這個方法必須在主線程中完成.dispatch_async(dispatch_get_main_queue(), ^{glUniformMatrix4fv(_modelViewProjectionMatrixIndex, 1, GL_FALSE, _modelViewProjectionMatrix.m);});}}

操作矩陣這里，暫時不想講,后面我會專門來講矩陣變換和角度傳感器的使用,因為這兩個東西在游戲和VR,還是AR的世界,都太重要了。今天先說的這里，給幾張展示圖欣賞一下。

全景模式下
普通視頻 普通視頻雙屏展示 全景視頻VR模式 全景.gif

需要代碼在這里和這里

全景播放器-實現(xiàn)方案2

使用SceneKit 也可以實現(xiàn)全景播放器,需要了解的朋友請查看這里

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