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Figured it out by looking other shader examples and hopefully it will benefit others. elapsedTime can be added to the computation or offset and will animate the effect, some use sin/cos as well.. uniform float elapsedTime;


You don't set these values in the shader. You set them in your program, generally when first creating the texture (though it can be set or changed whenever). If you've already uploaded your texture data to OpenGL then all you have to do is this: First bind the texture if it is not already. glBindTexture(GL_TEXTURE_2D, texture_id); Then set the ...


One way of doing this is creating and loading an image into memory that is as large as the background. However, this seems like a horrible waste of memory. To affect the whole screen with a fragment shader you don't need a full-screen texture, just a full-screen polygon (one quad or two triangles). The four vertices would have attributes on them. At the ...


I suggest you make a skybox: A skybox is a large cube which you render around your camera which will give you the ability to pass each pixel through a fragment shader. And you can render anything onto the skybox: a color, an image, a gradient, etc. Just be sure to call glClear(GL_COLOR_BUFFER_BIT || GL_DEPTH_BUFFER_BIT); A good tutorial on this topic is ...


If you are just filling with a solid color then you could pass that color to the fragment shader as a uniform, and process it from there. Use a full screen quad for the fragment shader to render onto. Another way is to this to render the background to an FBO and do the full screen quad trick but apply the FBO texture to it. This would be very memory ...


Use several constant buffers and group variables together based on how often they change. If your variables are fairly static ( or just huge ) you may be better off converting values into a texture and extracting them in the shader.


Modern hardware performs early stencil testing using the same sort of tile-based approach as early depth. It can reject large groups of fragments before they make it to the fragment shader stage. That means shader units will not waste time calculating data they are just going to throw out anyway. You add an extra 8-bits of memory per-pixel (pretty much a ...

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