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2014/10/15 ¤U¤È 10:09:40
iphone Programming Glossary: glslhttp://stackoverflow.com/questions/12257429/how-do-i-modify-a-gpuimagegaussianselectiveblurfilter-to-operate-over-a-rectangl by default for the dead center of the image to the current pixel's coordinate. The last line uses the smoothstep GLSL function to smoothly interpolate between 0 and 1 when the distance from the center point travels between two thresholds..
PowerVR SGX535 Shader Performance (OpenGL ES 2.0) http://stackoverflow.com/questions/3320661/powervr-sgx535-shader-performance-opengl-es-2-0 Performance OpenGL ES 2.0 I'm currently working on a couple of shaders for an iPad game and it seems as if Apple's GLSL compiler isn't doing any optimizations or very few . I can move a single line in a shader and drop my FPS from 30 to 24.. why this is happening. Does anyone have any references for the following what PowerVR instructions are generated from GLSL instructions what are the timings of the PowerVR instructions what sort of parallel processing units are in the PowerVR535..
What version of GLSL is used in the iPhone(s)? http://stackoverflow.com/questions/3456669/what-version-of-glsl-is-used-in-the-iphones version of GLSL is used in the iPhone s I know that iPhone uses OpenGL ES 2.0 but I don't know the version of the underlying language GLSL... is used in the iPhone s I know that iPhone uses OpenGL ES 2.0 but I don't know the version of the underlying language GLSL. Is it 1.3 1.4 2.0 other Thanks. iphone opengl es glsl share improve this question Ok I found it myself thanks to the.. opengl es glsl share improve this question Ok I found it myself thanks to the __ VERSION __ predefined macro. The GLSL ES specification used is the 1.0 which is based on the GLSL version 1.20. The OpengGL ES 2.0 and GLSL ES 1.0 specifications..
How can you track motion using the iPhone's camera? http://stackoverflow.com/questions/3933716/how-can-you-track-motion-using-the-iphones-camera WWDC 2007. That example is described in Chapter 27 of the GPU Gems 3 book . The basic idea is that you can use custom GLSL shaders to process images from the iPhone camera in realtime determining which pixels match a target color within a given..
How do I perform a fast pixellation filter on an image? http://stackoverflow.com/questions/5049041/how-do-i-perform-a-fast-pixellation-filter-on-an-image that controls the pixel width in the processed image This filter is the result of a fragment shader with the following GLSL code varying highp vec2 textureCoordinate uniform sampler2D inputImageTexture uniform highp fractionalWidthOfPixel void..
Recommended practice environment for OpenGL ES 2.0? http://stackoverflow.com/questions/5606411/recommended-practice-environment-for-opengl-es-2-0 OpenGL shaders. I demonstrate an example of doing this kind of prototyping in an article I wrote here . Desktop GLSL and the implementation in OpenGL ES differs slightly but much is the same between the two. While targeted at iOS I taught..
iOS based OpenGL ES programming http://stackoverflow.com/questions/6074688/ios-based-opengl-es-programming something that worked. In your case I'd look very carefully at the resources linked in the answers to the question GLSL for simple water surface effects which do exactly what you want. One implementation uses OpenGL ES 1.1 the other 2.0 style..
GLSL: Built-in attributes not accessible for iPhone Apps? http://stackoverflow.com/questions/8205501/glsl-built-in-attributes-not-accessible-for-iphone-apps Built in attributes not accessible for iPhone Apps I am getting really desperate here. I working with Xcode trying to implement.. geometry vertices indices calculating etc. and passing the respective arguments as attributes to the shader written in GLSL . Using these attributes works fine some really basic shader programs compile correctly and give the expected output. Now.. I'm trying to start with some more advanced calculations for which I need to use some of the built in attributes of GLSL namely i.e. the gl_NormalMatrix but whenever I try that the program crashes and I get an ERROR 0 3 Use of undeclared identifier..
Draw a straight line using OpenGL ES in iPhone? http://stackoverflow.com/questions/9736887/draw-a-straight-line-using-opengl-es-in-iphone seems to be required in order to be able to draw with OpenGL ES 2.0. Without the GLKBaseEffect you would need to use GLSL. The template provides an example of both with and without explicit GLSL Shader code. The template creates a setupGL function.. the GLKBaseEffect you would need to use GLSL. The template provides an example of both with and without explicit GLSL Shader code. The template creates a setupGL function which I modified to look like this void setupGL EAGLContext setCurrentContext..
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