textures

Using three.js, I'm working on a web page to display a flip cube (a.k.a. magic cube; see e.g. the video on this page ). On a flip cube, there are typically images that are spread out across multiple pieces of the cube. For example, the boat image shown above is spread across the faces of four cubelets. In three.js terms, there are multiple meshes that need to use the same image for their material texture, but each at a different offset. As far as I understand it, in three.js, offset is a property of a texture , not of a material or a mesh. Therefore, it would appear that you cannot have a

I try to read values from a texture and write them back to global memory. I am sure the writing part works, beause I can put constant values in the kernel and I can see them in the output: __global__ void bartureKernel( float* g_odata, int width, int height) { unsigned int x = blockIdx.x*blockDim.x + threadIdx.x; unsigned int y = blockIdx.y*blockDim.y + threadIdx.y; if(x < width && y < height) { unsigned int idx = (y*width + x); g_odata[idx] = tex2D(texGrad, (float)x, (float)y).x; } } The texture I want to use is a 2D float texture with two channels, so I defined it as: texture<float2, 2,

I'm rendering a certain scene into a texture and then I need to process that image in some simple way. How I'm doing this now is to read the texture using glReadPixels() and then process it on the CPU. This is however too slow so I was thinking about moving the processing to the GPU. The simplest setup to do this I could think of is to display a simple white quad that takes up the entire viewport in an orthogonal projection and then write the image processing bit as a fragment shader. This will allow many instances of the processing to run in parallel as well as to access any pixel of the

Quads are not included in OpenGL ES 2.0 as they were in 1.1. With the programmable pipeline offered by OpenGL ES 2.0, how can I simply draw a texture (originally a png file) into 4 defined points? Do I need a VBO? Do I need to compute a perspective matrix? All these things are messy for me... The platform used is the iPhone. Stéphane Péchard I found the answer. It is mandatory to use a perspective matrix and a shader, even for such a simple task. This answer helped me to do it. Here is the code I used, with functions es*() from this book : // generate an orthographic matrix

using this code I can send one texture to the shader: devcon->PSSetShaderResources(0, 1, &pTexture); Of course i made the pTexture by: D3DX11CreateShaderResourceViewFromFile Shader: Texture2D Texture; return color * Texture.Sample(ss, texcoord); I'm currently only sending one texture to the shader, but I would like to send multiple textures, how is this possible? Thank You. By using Texture Arrays . When you fill out your D3D11_TEXTURE2D_DESC look at the ArraySize member. This desc struct is the one that gets passed to ID3D11Device::CreateTexture2D . Then in your shader you use a 3rd texcoord

My game is working correctly except in the case where I press the HOME button then resume. What needs to be done to use the textures again? I have tried calling onPause and onResume on the GLSurfaceView (when the activity's onPause and onResume are called). Any ideas what I could be doing wrong? If all else fails, reload the textures: Pseudocode for tex in textures: if glIsTexture(tex.opengl_name) == false: glGenTextures(1, &tex.opengl_name) glBindTexture(tex.texture_target); glTexImage(..., texture.image); Even if you fixed your problem, just to give a bit of explanation that might help