I am using a CUDA texture in border addressing mode (cudaAddressModeBorder). I am reading texture coordinates using tex2D<float>(). When the texture coordinates fall outside the texture, tex2D<float>() returns 0. How can I change this returned border value from 0 to something else? I could check the texture coordinate manually and set the border value myself. … Read more
In my 2D isometric engine, I have the following classes: maps(variable)/layers(variable)/cubes(variable)/sides(6)/points(4)/coordinates(3) Each sides contains 4 points(1 point = 1 coordinate(x, y, z)). Each cubes contains 6 sides. I can create a map with the size I want with cubes(same, the size I want). Folders: assets/numTexture/numLight.png I calculate with numTexture and numLight a number which is … Read more
as we all know, openGL uses a pixel-data orientation that has 0/0 at left/bottom, whereas the rest of the world (including virtually all image formats) uses left/top. this has been a source of endless worries (at least for me) for years, and i still have not been able to come up with a good solution. … Read more
I need to handle many objects which share only a few textures. Defining and loading textures one by one manually (as described in another post on SO) does not feel right… even more so since there’s no switch (index) {case:…} statement in WebGL. So I wanted to pass the texture to use for a vertex … Read more
I have a WebGLTexture object. How do I get pixels of that texture (similar to WebGL’s readPixels, but for a texture)? One idea I have is to create a canvas and a WebGL context with preserveDrawingBuffer=true, and render my texture on this canvas so that it shows 2D flat, and then use readPixels. Is this … Read more
This is just a quick question before I dive deeper into converting my current rendering system to openGL. I heard that textures needed to be in base 2 sizes in order to be stored for rendering. Is this true? My application is very tight on memory, but most of the bitmaps are not powers of … Read more
I have a 32×32 .png image that I want to repeat over a SCNPlane. The code I’ve got (See below) results in the image being stretched to fit the size of the plane, rather than repeated. CODE: let planeGeo = SCNPlane(width: 15, height: 15) let imageMaterial = SCNMaterial() imageMaterial.diffuse.contents = UIImage(named: “art.scnassets/grid.png”) planeGeo.firstMaterial = imageMaterial … Read more
I’m using/targetting OpenGL 4.20, GSLSL 4.20, core. Using C. I’m exploring graphics with OpenGL and have decided to make a tile based game. I’m at the point where i’d like to actually draw a bunch of tiles, and am trying to use glDrawElements to draw individual triangles. Relevant code: const float vertexPositions[] = { -1.0f, … Read more
How to deal with OpenGL cube map textures in CUDA? When one want to use OpenGL textures in CUDA kernel one of the things to do is to retrieve a CUDA array from registered image and mapped resource, in this case a texture. In driver API it is done by cuGraphicsSubResourceGetMappedArray call, which in a … Read more
Is it possible to draw texture (if it is with correct width, height and pixel format) directly to frame buffer without using vertices and shaders in Vulkan? Answer You can do a vkCmdCopyImage to copy from your vkImage to a swapchain’s vkImage provided the vkSurface supports being a TRANSFER_DST as by the supportedUsageFlags field from … Read more
