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我有一個問題，我想支持ios5的項目。我有一個應用程序的代碼，包含使用opengl-es的3d渲染和使用多采樣幀緩衝區的抗鋸齒。該代碼在ios4.3上運行良好。由於ios5三維模型不會被渲染。在模擬器上，我只是得到一個粉紅色的屏幕。解決multisample frambuffer錯誤，因爲ios5
一些測試後，我發現，該功能
glResolveMultisampleFramebufferAPPLE()
的問題。該功能引發錯誤。 0x502
NSLog(@"0x%x", glGetError()); // "0x502"
我不知道發生了什麼，爲什麼這個函數不能在ios5上工作。可以請任何人幫助我嗎？這是一些創建幀緩衝區的代碼。
//first destroy frame buffers
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
if(depthRenderbuffer)
{
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}
// Generate IDs for a framebuffer object and a color renderbuffer
glGenFramebuffersOES(1, &viewFramebuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
// This call associates the storage for the current render buffer with the EAGLDrawable (our CAEAGLLayer)
// allowing us to draw into a buffer that will later be rendered to screen whereever the layer is (which corresponds with our view).
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(id<EAGLDrawable>)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
//Width and height der viewBoundingBox in Pixeln
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
//Generate our MSAA Frame and Render buffers
glGenFramebuffersOES(1, &msaaFramebuffer);
glGenRenderbuffersOES(1, &msaaRenderBuffer);
//Bind our MSAA buffers
glBindFramebufferOES(GL_FRAMEBUFFER_OES, msaaFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, msaaRenderBuffer);
// Generate the msaaDepthBuffer.
// 4 will be the number of pixels that the MSAA buffer will use in order to make one pixel on the render buffer.
glRenderbufferStorageMultisampleAPPLE(GL_RENDERBUFFER_OES, 4,GL_RGB565_OES, backingWidth, backingHeight);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, msaaRenderBuffer);
glGenRenderbuffersOES(1, &msaaDepthBuffer);
//Bind the msaa depth buffer.
glBindRenderbufferOES(GL_RENDERBUFFER_OES, msaaDepthBuffer);
glRenderbufferStorageMultisampleAPPLE(GL_RENDERBUFFER_OES, 4, GL_DEPTH_COMPONENT16_OES, backingWidth , backingHeight);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, msaaDepthBuffer);
// Make sure that you are drawing to the current context
[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GL_FRAMEBUFFER_OES, msaaFramebuffer);
[controller drawView:self];
//Bind both MSAA and View FrameBuffers
glBindFramebufferOES(GL_READ_FRAMEBUFFER_APPLE, msaaFramebuffer);
glBindFramebufferOES(GL_DRAW_FRAMEBUFFER_APPLE, viewFramebuffer);
if((err = glGetError())) NSLog(@"%x error in line %u in method %s", err, __LINE__, __FUNCTION__);
// Call a resolve to combine both buffers
glResolveMultisampleFramebufferAPPLE();
if((err = glGetError())) NSLog(@"%x error in line %u in method %s", err, __LINE__, __FUNCTION__);
// Use discard to improve fill rate and overall performance!
GLenum attachments[] = {GL_DEPTH_ATTACHMENT_OES, GL_COLOR_ATTACHMENT0_OES, GL_STENCIL_ATTACHMENT_OES};
glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 3, attachments);
// Present final image to screen
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context presentRenderbuffer:GL_RENDERBUFFER_OES];