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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html#//apple_ref/doc/uid/TP30000943" target="_top">Reference Library</a> > <a href="../index.html#//apple_ref/doc/uid/TP30000925" target="_top">Sample Code</a> > <a href="../GraphicsImaging/index.html#//apple_ref/doc/uid/TP30000925-TP30000424" target="_top">Graphics & Imaging</a> > <a href="../GraphicsImaging/idxOpenGL-date.html#//apple_ref/doc/uid/TP30000925-TP30000424-TP30000549">OpenGL</a> > <A HREF="javascript:location.replace('index.html');">CoreImageGLTextureFBO</A> >
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<h2>/ReadMe.txt</h2>
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<p><strong><a href="CoreImageGLTextureFBO.zip">Download Sample</a></strong> (“CoreImageGLTextureFBO.zip”, 504.7K)<BR>
<strong><a href="CoreImageGLTextureFBO.dmg">Download Sample</a></strong> (“CoreImageGLTextureFBO.dmg”, 512.1K)</p>
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<pre class="sourcecodebox">Core Image to OpenGL Texture.
This sample shows how to render with Core Image into an
OpenGL accelerated offscreen area known as an FBO (framebuffer object).
This technique provides the benefit of leveraging Core Image
and use its results as OpenGL textures.
Here we use a series of CIHueAdjust, CIGammaAdjust, and CIGloom filters
to adjust the picture of a Rose, which seems to float on top of a reflective
surface.
The code is all contained in MyOpenGLView.m.
The runtime flow of the project is the following:
- (id)initWithFrame:(NSRect)frameRect
A first attempt is made for an antialised pixel format, if that
should fail, a less demanding pixel format is selected and the
OpenGL context is created. Then we synchronized the buffer swaps
to the vertical refresh of the display to avoid tearing.
- (void) prepareOpenGL
Here the code starts dispatching to setup the CIImage, CIFilter,
CIContext, the FBO, clear color, blending, and texturing.
- (void)setupImageWithCIFilter
Creates the CIImage from Rose.jpg and CIFilter with CIExposureAdjust.
- (BOOL)createCIContext
Creates the CIContext based on the OpenGL context.
- (void)setFBO
Make sure the framebuffer extenstion is supported on the current renderer.
The Framebuffer Object is created, and a texture with the same dimensions
as the CIImage is attached as the color destination of the FBO.
- (void)drawRect:(NSRect)theRect
drawRect gets called to render.
The CIFilter gets the exposureValue assigned, which is controlled
by the user via the NSSlider.
It calls,
- (void)renderCoreImageToFBO method:
makes the framebuffer object (FBO) the destination for rendering,
sets up an orthographic screen aligned 2D mode for OpenGL,
it asks the CIContext to draw the image and
sets the destination for rendering the default framebuffer.
At this point the result of the Core Image process is stored
in the OpenGL texture object FBOTextureId.
- (void) renderScene
sets up an perspective for the 3D look,
renders a quad with the texture upside down and decreasing
in intensity as the reflection, renders a quad without the
texture to simulate a reflective surface, and finally
renders another quad with the texture on top of the
reflective surface.
Finally, the OpenGL context is flushed to get the contents to
the screen.
- (void) dealloc
Delete the texture and the framebuffer object (FBO).
References:
OpenGL Programming Guide for Mac OS X
<http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/>
Core Image Programming Guide
<http://developer.apple.com/documentation/GraphicsImaging/Conceptual/CoreImaging/index.html>
Core Image Filter Reference
<http://developer.apple.com/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html>
</pre>
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