mipmaps

I'm developing an iPad app that uses large textures in OpenGL ES. When the scene first loads I get a large black artifact on the ceiling for a few frames, as seen in the picture below. It's as if higher levels of the mipmap have not yet been filled in. On subsequent frames, the ceiling displays correctly. This problem only began showing up when I started using mipmapping. One possible explanation is that the glGenerateMipmap() call does its work asynchronously, spawning some mipmap creation worker (in a separate process, or perhaps in the GPU) and returning. Is this possible, or am I barking

This question already has an answer here : Closed 4 years ago . Mipmaps vs. drawable folders [duplicate] (1 answer) How to load images from the mipmap folder programmatically (as done with the drawables)? img.setImageResource(imageId); I am using Android Studio 1.2.1. In Android Studio We have mipmap instead of drawable You Can Find Documents Related To Your Assets Here You can use it Like img.setImageResource(R.mipmap.ic_launcher); You can do img.setImageResource(R.mipmap.imageid); 来源： https://stackoverflow.com/questions/30800708/how-to-load-images-from-mipmap-folder-programmatically

I was wondering if the quality of texture mipmaps would be better if I used my own algorithm for pre-generating them, instead of the built-in automatic one. I'd probably use a slow but pretty algorithm, like Lanczos resampling. Does it make sense? Will I get any quality gain on modern graphics cards? There are good reasons to generate your own mipmaps. However, the quality of the downsampling is not one of them. Game and graphic programmers have experimented with all kinds of downsampling algorithms in the past. In the end it turned out that the very simple "average four pixels"-method gives

I am using OpenGL to do some GPGPU computations through the combination of one vertex shader and one fragment shader. I need to do computations on a image at different scale. I would like to use mipmaps since their generation can be automatic and hardware accelerated. However I can't manage to get access to the mipmap textures in the fragment shader. I enabled automatic mipmap generation: glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); I tried using texture2DLod in the shader with no luck, it simply kept giving the normal texture. I also tried using glTextureParameteri(GL_BASE

When I try to use mipmap filtering in LibGDX, none of the images appear. I'm new to LibGDX, and I have a simple 2d scene with three rotating, scaled circles. In order to anti-alias them, I wanted to use linear filtering. For advice, I looked to this article ,which said that, for heavily scaled images, a mipmap can be used to improve speed or quality. The first unexpected appearance was that, despite the fact that all of my images were scaled down, I would only see a linear filter if the magFilter was linear. In other words: This code will show a linear filter for minified images: parentTexture

I recently installed one more Android SDK to Android Studio, the SDK version 4.4 (API level 19), and after using it with my project, it added a set of mipmap folders in the project's res folder ( res/mipmap ). I neither understand why, or how to use them. I read another question about it here on SO . The answer to it said that: The mipmap folders are for placing your app icons in only. Any other drawable assets you use should be placed in the relevant drawable folders as before. According to this Google blogpost : It’s best practice to place your app icons in mipmap- folders (not the drawable-

I understand mipmapping pretty well. What I do not understand (on a hardware/driver level) is how mipmapping improves the performance of an application (at least this is often claimed). The driver does not know until the fragment shader is executed which mipmap level is going to be accessed, so anyway all mipmap levels need to be present in the VRAM, or am I wrong? What exactly is causing the performance improvement? Andon M. Coleman You are no doubt aware that each texel in the lower LODs of the mip-chain covers a higher percentage of the total texture image area, correct? When you sample a