opengl-es-2.0

I'm learning OpenGL ES 2.0 and I'd like to create an App to better understand how it works. The App has a set of filter that the user can apply on images (I know, nothing new :P). One of this filter takes two images and a mask and it mixes the two images showing them through the mask (here an image to better explain what I want to obtain) At the moment I'm really confused and I don't know where to start to create this effect. I can't understand wether I have to work with multiple textures and multiple FrameBuffers or I can just work with a single shader. Do you have any hint to help me in

I'm having a real problem with the Google's OpenGL demo for Android . I set it up in Eclipse but can't get it to execute. It builds with no problems, but then stops at "java.lang.IllegalArgumentException: No config chosen" right before it opens. I've been up and down Google searches and Stack threads with no solution. I did find what I thought was a lead here: OpenGL ES 2.0 Support for Android? It uses a command gLSurfaceView.setEGLConfigChooser(8 , 8, 8, 8, 16, 0); but alas, I'm new to OpenGL on android and don't know where to put it... Any help would be greatly appreciated. I'm running

is it possible to have semi-transparent video (created with blue-screen) playing on top of a UIView ? I was wondering that in case that's not doable with the MPMoviePlayerViewController it might be by using OpenGL ES and a video texture ? Thank you in advance, F. It is possible using the ffmpeg library. Here is the link, where you can download a very good example link Then you just have to set the alpha property to the UIImageView. But i'm not sure about performance, try :) 来源： https://stackoverflow.com/questions/4796626/iphone-display-a-semi-transparent-video-on-top-of-a-uiview

From the OpenGL ES spec section 2.10.4 (Shader Variables: Varying Variables): The number of interpolators available for processing varying variables is given by the implementation-dependent constant MAX_VARYING_VECTORS . This value represents the number of four-element floating-point vectors that can be interpolated; varying variables declared as matrices or arrays will consume multiple interpolators. When a program is linked, any varying variable written by a vertex shader, or read by a fragment shader, will count against this limit. A program whose shaders access more than MAX_VARYING

I'm developing an image warping iOS app with OpenGL ES 2.0. I have a good grasp on the setup, the pipeline, etc., and am now moving along to the math. Since my experience with image warping is nil, I'm reaching out for some algorithm suggestions. Currently, I'm setting the initial vertices at points in a grid type fashion, which equally divide the image into squares. Then, I place an additional vertex in the middle of each of those squares. When I draw the indices, each square contains four triangles in the shape of an X. See the image below: After playing with photoshop a little, I noticed

I can blend two textures with different blending modes in the fragment shader when both the textures covers the same rectangles. But now my problem is, one texture is a plain rectangle with no rotation and the other texture is another rectangle with a rotation/scale and translation. How do I merge these textures in the way I want? (In the picture) I know how to do this... But not sure how to do this... For blending textures in one rectangle (the first image), I used the following code.. Objective C code... - (void) display { [EAGLContext setCurrentContext:context]; glBindFramebuffer(GL