ios – – [EAGLContext renderbufferStorage：fromDrawable：]第二次失败？

概述我正在开发一个iOS openGL ES应用程序. 我正在做通常的EAGLView / ES2Render. 在启动时,使用以下代码创建frambuffer成功： - (BOOL) createFramebuffers{ [EAGLContext setCurrentContext:_mainContext]; // [ A ] On-screen // 1. F 我正在开发一个iOS openGL ES应用程序.

我正在做通常的EAGLVIEw / ES2Render.

在启动时,使用以下代码创建frambuffer成功：

- (BOol) createFramebuffers{    [EAGLContext setCurrentContext:_mainContext];    // [ A ] On-screen      // 1. Framebuffer    glGenFramebuffers(1,&_mainFramebuffer);    bindFramebuffer(_mainFramebuffer);    // 2. color buffer    glGenRenderbuffers(1,&_maincolorbuffer);    bindRenderbuffer(_maincolorbuffer);    // Adjust size to vIEw's layer:    CAEAGLLayer* layer = (CAEAGLLayer*)[_vIEw layer];    if (![_mainContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer]) {        // something went horribly wrong        NSLog(@"-[ES2Renderer createFramebuffers]: Failed to obtain renderbuffer storage from layer!");        return NO;    }    // query new size:    glGetRenderbufferParameteriv(GL_RENDERBUFFER,GL_RENDERBUFFER_WIDTH,&_backingWIDth);    glGetRenderbufferParameteriv(GL_RENDERBUFFER,GL_RENDERBUFFER_HEIGHT,&_backingHeight);    // Attach to color:    glFramebufferRenderbuffer(GL_FRAMEBUFFER,GL_color_ATTACHMENT0,GL_RENDERBUFFER,_maincolorbuffer);    // 3. Depth buffer    glGenRenderbuffers(1,&_depthBuffer);    bindRenderbuffer(_depthBuffer);    if (_useStencilBuffer) {        // Depth + Stencil        // Allocate storage:        glrenderbufferStorage(GL_RENDERBUFFER,GL_DEPTH24_STENCIL8_OES,_backingWIDth,_backingHeight);        // Attach to depth:        glFramebufferRenderbuffer(GL_FRAMEBUFFER,GL_DEPTH_ATTACHMENT,_depthBuffer);        // Attach to stencil:        glFramebufferRenderbuffer(GL_FRAMEBUFFER,GL_STENCIL_ATTACHMENT,_depthBuffer);    }    else{        // Depth only        // Allocate storage:        glrenderbufferStorage(GL_RENDERBUFFER,GL_DEPTH_COMPONENT24_OES,_backingHeight);        // Attachto depth:        glFramebufferRenderbuffer(GL_FRAMEBUFFER,_depthBuffer);    }    // 4. ValIDate the set:    GLenum framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);    if (framebufferStatus != GL_FRAMEBUFFER_COMPLETE) {        // Something went wrong!        NSLog(@"-[ES2Renderer createFramebuffers]: Failed to make complete framebuffer object: %@",[self stringFromFramebufferStauts:framebufferStatus]);        return NO;    }    // [ B ] off-screen (Render-to-texture)    // 1. Framebuffer    glGenFramebuffers(1,&_transFramebuffer);    bindFramebuffer(_transFramebuffer);    // 2. Depth buffer    glGenRenderbuffers(1,&_transDepthBuffer);    bindRenderbuffer(_transDepthBuffer);    if (_useStencilBuffer) {        // Allocate storage:        glrenderbufferStorage(GL_RENDERBUFFER,_transDepthBuffer);        // Attach to stencil:        glFramebufferRenderbuffer(GL_FRAMEBUFFER,_transDepthBuffer);    }    else{        // Allocate storage        glrenderbufferStorage(GL_RENDERBUFFER,_transDepthBuffer);   }    // 3. Textures (color buffers)    gluint* texPtrs[2] = {&_transTexture1,&_transTexture2};    for (NSUInteger i=0; i < 2; i++) {        gluint* texPtr = texPtrs[i];        // Create:        glGenTextures(1,texPtr);        // Bind:        bindTexture2D(*texPtr);        // Configure for pixel-aligned use:        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);        // Allocate storage:        glTexImage2D(GL_TEXTURE_2D,GL_RGBA,_backingHeight,GL_UNSIGNED_BYTE,0);        // Attach:        glFramebufferTexture2D(GL_FRAMEBUFFER,GL_TEXTURE_2D,*texPtr,0);        framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);        // ValIDate:        if ( framebufferStatus != GL_FRAMEBUFFER_COMPLETE) {            // Something went wrong!            NSLog(@"-[ES2Renderer createFramebuffers]: Failed to make complete framebuffer object: %@",[self stringFromFramebufferStauts:framebufferStatus]);            return NO;        }    }    // Final State:    bindFramebuffer(_mainFramebuffer);    bindRenderbuffer(_maincolorbuffer);    bindTexture2D(0);    NSLog(@"-[ES2Renderer createFramebuffers] Succeeded.");    return YES;}

不久之后,UIVIEw的-layoutSubvIEws被调用,然后我执行-resizefromLayer ::

- (BOol) resizefromLayer:(CAEAGLLayer *)layer{    // [ A ] On screen framebuffer    bindFramebuffer(_mainFramebuffer);    // 1. Resize color buffer    bindRenderbuffer(_maincolorbuffer);    if (![_mainContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:layer]) {        // Something went wrong        return NO; // <-- SECOND TIME ON,THIS HAPPENS    }    // query new size:    glGetRenderbufferParameteriv(GL_RENDERBUFFER,&_backingHeight);    // 2. Resize depth buffer    bindRenderbuffer(_depthBuffer);    if (_useStencilBuffer) {        // (Depth & Stencil)        glrenderbufferStorage(GL_RENDERBUFFER,_backingHeight);    }    else{        // (Depth only)        glrenderbufferStorage(GL_FRAMEBUFFER,_backingHeight);    }    // ...ValIDate:    GLenum framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);    if (framebufferStatus != GL_FRAMEBUFFER_COMPLETE) {        // Something went wrong!        NSLog(@"-[ES2Renderer resizefromLayer:]: Failed to make complete framebuffer object: %@",[self stringFromFramebufferStauts:glCheckFramebufferStatus(GL_FRAMEBUFFER)]);        return NO;    }    // [ B ] Off screen (render-to-terxture) framebuffer    bindFramebuffer(_transFramebuffer);    // 1. Resize depth buffer    bindRenderbuffer(_transDepthBuffer);    if (_useStencilBuffer) {        glrenderbufferStorage(GL_RENDERBUFFER,_backingHeight);    }    else{        glrenderbufferStorage(GL_RENDERBUFFER,_backingHeight);            }    // 2. Resize textures    gluint* texPtrs[2] = {&_transTexture1,&_transTexture2};    for (NSUInteger i=0; i < 2; i++) {        gluint* texPtr = texPtrs[i];        // Bind:        bindTexture2D(*texPtr);        // Configure for pixel-aligned use:        glTexParameteri(GL_TEXTURE_2D,0);        // ValIDate:        if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {            // Something went wrong!            Nsstring* statusstring = [self stringFromFramebufferStauts:glCheckFramebufferStatus(GL_FRAMEBUFFER)];            NSLog(@"-[ES2Renderer resizefromLayer:]: Failed to make complete framebuffer object: %@",statusstring);            return NO;        }    }    bindFramebuffer(_mainFramebuffer);    bindRenderbuffer(_maincolorbuffer);    // Pass new ortho projection to shaders    [self initializeModelVIEwMatrix];    [self initializeSpriteProgram];    // Set new vIEwport    glVIEwport(0,_backingHeight);    NSLog(@"-[ES2Renderer resizefromLayer:]: Succeeded.");    return YES;}

我所做的一切都不是特别的.我有一个单独的帧缓冲区来渲染场景过渡,有两个纹理可以附加到颜色和深度.

第二次-renderbufferStorage：fromDrawable：被调用(-layoutSubvIEws – > resizefromLayer :),它总是失败(返回NO);在此之前调用glGetError()不会导致错误,但在返回GL_INVALID_OPERATION后立即调用它.
如果我忽略了这一点并继续,glGetRenderbufferParameteriv()仍然可以获得正确的宽度和高度(分别在iPhone 5上为640和1136),但glCheckFramebufferStatus()将返回GL_FRAMEBUFFER_UNSUPPORTED.

或者,我跳过上面的resizefromLayer：并将其替换为：

- (BOol) resizefromLayer:(CAEAGLLayer *)layer{    [self destroyFramebuffers];    return [self createFramebuffers];}

…但是同样的错误仍然存​​在(-renderStorage：fromDrawable：Failed;这次是在-createFramebuffers中).

现在,我只返回YES(我的应用只支持肖像,所以实际上没有发生屏幕尺寸变化),但我真的想修复它,因为有一天我需要支持景观等…

解决方法 renderbufferStorage：fromDrawable：失败的一个可能原因是_mainContext不是当时的当前上下文.尽管似乎没有其他上下文可以窃取“当前”状态,但我建议在对该上下文关联的对象上运行的任何gl或EAGL代码之前调用[EAGLContext setCurrentContext：_mainContext](例如,在resizefromLayer的开头：方法). 总结

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