2014/10/15 下午 10:07:53

iphone Programming Glossary: eaglcontext

Drawing into OpenGL ES framebuffer and getting UIImage from it on iPhone

http://stackoverflow.com/questions/10936157/drawing-into-opengl-es-framebuffer-and-getting-uiimage-from-it-on-iphone

of some primitives in OpenGL ES on iOS. The code is as follows context and neccesary buffers @interface RendererGL EAGLContext myContext GLuint framebuffer GLuint colorRenderbuffer GLuint depthRenderbuffer .m file id init self super init if self .. colorRenderbuffer GLuint depthRenderbuffer .m file id init self super init if self initializing context myContext EAGLContext alloc initWithAPI kEAGLRenderingAPIOpenGLES2 EAGLContext setCurrentContext myContext self setupOpenGL creating buffers return.. init self super init if self initializing context myContext EAGLContext alloc initWithAPI kEAGLRenderingAPIOpenGLES2 EAGLContext setCurrentContext myContext self setupOpenGL creating buffers return self void setupOpenGL int width 256 int height 256..

How do I blend two textures with different co-ordinates in OpenGL ES 2.0 on iPhone?

http://stackoverflow.com/questions/12242443/how-do-i-blend-two-textures-with-different-co-ordinates-in-opengl-es-2-0-on-ipho

For blending textures in one rectangle the first image I used the following code.. Objective C code... void display EAGLContext setCurrentContext context glBindFramebuffer GL_FRAMEBUFFER targetFBO glUseProgram program glActiveTexture GL_TEXTURE2 glBindTexture..

Draw to offscreen renderbuffer in OpenGL ES (iPhone)

http://stackoverflow.com/questions/1853551/draw-to-offscreen-renderbuffer-in-opengl-es-iphone

offscreenRenderbuffer But I'm confused on how to render the storage. Apple's documentation says to use the EAGLContext renderBufferStorage fromDrawable method but this seems to only work for one render buffer the main one being displayed ...

OpenGL ES Simple Undo Last Drawing

http://stackoverflow.com/questions/2708055/opengl-es-simple-undo-last-drawing

how to implement a simple undo of last drawing action on the iPhone screen. I draw by first preparing the frame buffer EAGLContext setCurrentContext context glBindFramebufferOES GL_FRAMEBUFFER_OES viewFramebuffer I then prepare the vertex array and draw..

Why is my EAGLVIew not rendering anymore in iOS 4.2?

http://stackoverflow.com/questions/4270320/why-is-my-eaglview-not-rendering-anymore-in-ios-4-2

docs UPDATE 2 I'm using OpenGL ES 1.1 and not 2.0. Here is what I do in EAGLView's layoutSubViews void layoutSubviews EAGLContext setCurrentContext _context self destroyFramebuffer self createFramebuffer self drawView And this is my createFramebuffer..

CADisplayLink OpenGL rendering breaks UIScrollView behaviour

http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour

if dispatch_semaphore_wait frameRenderingSemaphore DISPATCH_TIME_NOW 0 return dispatch_async openGLESContextQueue ^ EAGLContext setCurrentContext context Render here dispatch_semaphore_signal frameRenderingSemaphore where frameRenderingSemaphore is..

Undo drawing in Paint Application

http://stackoverflow.com/questions/6689600/undo-drawing-in-paint-application

toPoint CGPoint end static GLfloat eraseBuffer NULL static NSUInteger eraseMax 64 NSUInteger vertexCount 0 count i EAGLContext setCurrentContext context glBindFramebufferOES GL_FRAMEBUFFER_OES viewFramebuffer Convert locations from Points to Pixels..

Record the drawing as a m4v video file - OpenGL

http://stackoverflow.com/questions/9661259/record-the-drawing-as-a-m4v-video-file-opengl

is a circle I researched on this topic but I didn't find any good methods to do the functionality. Code PaintingView.h EAGLContext context OpenGL names for the renderbuffer and framebuffers used to render to this view GLuint viewRenderbuffer viewFramebuffer.. toPoint CGPoint end static GLfloat vertexBuffer NULL static NSUInteger vertexMax 64 NSUInteger vertexCount 0 count i EAGLContext setCurrentContext context glBindFramebufferOES GL_FRAMEBUFFER_OES viewFramebuffer Convert locations from Points to Pixels.. GL_RENDERBUFFER_OES viewRenderbuffer context presentRenderbuffer GL_RENDERBUFFER_OES Erases the screen void erase EAGLContext setCurrentContext context Clear the buffer glBindFramebufferOES GL_FRAMEBUFFER_OES viewFramebuffer glClearColor 0.0 0.0..

Draw a straight line using OpenGL ES in iPhone?

http://stackoverflow.com/questions/9736887/draw-a-straight-line-using-opengl-es-in-iphone

in my project @synthesize context _context @synthesize effect _effect void viewDidLoad super viewDidLoad self.context EAGLContext alloc initWithAPI kEAGLRenderingAPIOpenGLES2 if self.context NSLog @ Failed to create ES context GLKView view GLKView self.view.. context GLKView view GLKView self.view view.context self.context view.drawableDepthFormat GLKViewDrawableDepthFormat24 EAGLContext setCurrentContext self.context self setupGL void glkView GLKView view drawInRect CGRect rect NSLog @ DrawInRect Method EAGLContext.. setCurrentContext self.context self setupGL void glkView GLKView view drawInRect CGRect rect NSLog @ DrawInRect Method EAGLContext setCurrentContext self.context This method is calling multiple times.... glClearColor 0.65f 0.65f 0.65f 1.0f glClear GL_COLOR_BUFFER_BIT..