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POGPUImage render to OpenGL ES texture does not work
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  1. POGPUImage render to OpenGL ES texture does not work
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    copied!<p>I would like to render a video in an <code>OpenGL ES</code> texture so that I can apply this texture to a 3D surface in my iOS program. To do that I'm using <code>GPUImage</code>, but it does not work, no texture seems to be loaded in the output.</p> <p>Here is the .h code :</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;GLKit/GLKit.h&gt; #import "GPUImage.h" @interface ViewController : GLKViewController &lt;GPUImageTextureOutputDelegate&gt; { GLuint texture; GPUImageMovie* movie; GPUImageTextureOutput *output; GPUImagePixellateFilter* pixellateFilter; } @end </code></pre> <p>And here are parts of the.m file :</p> <p>Init</p> <pre><code>- (void)setupGL { [EAGLContext setCurrentContext:self.context]; [self loadShaders]; _vertexArrayBuff = generateSphere(0, 0, 0, 10, 20, 10, &amp;_arraySize); glEnable(GL_DEPTH_TEST); glGenVertexArraysOES(1, &amp;_vertexArray); glBindVertexArrayOES(_vertexArray); glGenBuffers(1, &amp;_vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); glBufferData(GL_ARRAY_BUFFER, _arraySize * sizeof(GLfloat), _vertexArrayBuff, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(0)); glEnableVertexAttribArray(GLKVertexAttribNormal); glVertexAttribPointer(GLKVertexAttribNormal, 3, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(12)); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(24)); glBindVertexArrayOES(0); NSString* fileStr = [[NSBundle mainBundle] pathForResource:@"video" ofType:@"mp4"]; NSURL* fileUrl = [NSURL fileURLWithPath:fileStr]; movie = [[GPUImageMovie alloc] initWithURL:fileUrl]; output = [[GPUImageTextureOutput alloc] init]; output.delegate = self; pixellateFilter = [[GPUImagePixellateFilter alloc] init]; [movie addTarget:pixellateFilter]; [pixellateFilter addTarget:output]; [movie startProcessing]; } </code></pre> <p>Render</p> <pre><code>- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect { glClearColor(0.65f, 0.65f, 0.65f, 1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBindVertexArrayOES(_vertexArray); // Render the object again with ES2 glUseProgram(_program); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glUniformMatrix4fv(uniforms[UNIFORM_MODELVIEWPROJECTION_MATRIX], 1, 0, _modelViewProjectionMatrix.m); glUniformMatrix3fv(uniforms[UNIFORM_NORMAL_MATRIX], 1, 0, _normalMatrix.m); glUniform1i(uniforms[UNIFORM_TEXTUTRE], 0); glDrawArrays(GL_TRIANGLES, 0, _arraySize / 8); } </code></pre> <p>Delegate</p> <pre><code>- (void)newFrameReadyFromTextureOutput:(GPUImageTextureOutput *)callbackTextureOutput; { dispatch_async(dispatch_get_main_queue(), ^{ texture = callbackTextureOutput.texture; }); } </code></pre> <p>I tried to manually load a texture and display it and it worked so the shaders and texture coordinates are not the issue.</p> <p>But when I try to set the texture with <code>GPUImage</code> it does not work any more, my texture is not displayed, instead I have a black surface.</p> <p>Does anyone know what I did wrong? I followed the <code>CubeExample</code> from <code>GPUImage</code> but it does not work.</p> <p>I really need some help now</p> <p>Thank you!</p> <p>PS: I'm targeting iOS 6.1 and I'm using XCode 4.6.2</p> <p><strong>EDIT</strong></p> <p>Here is the code of the function called at beginning :</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2 sharegroup:[[[GPUImageContext sharedImageProcessingContext] context] sharegroup]]; if (!self.context) { NSLog(@"Failed to create ES context"); } GLKView *view = (GLKView *)self.view; view.context = self.context; view.drawableDepthFormat = GLKViewDrawableDepthFormat24; [self setupGL]; } </code></pre>
 

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