textures

Let's say we have a texture (in this case 8x8 pixels) we want to use as a sprite sheet. One of the sub-images (sprite) is a subregion of 4x3 inside the texture, like in this image: (Normalized texture coordinates of the four corners are shown) Now, there are basically two ways to assign texture coordinates to a 4px x 3px-sized quad so that it effectively becomes the sprite we are looking for; The first and most straightforward is to sample the texture at the corners of the subregion: // Texture coordinates GLfloat sMin = (xIndex0 ) / imageWidth; GLfloat sMax = (xIndex0 + subregionWidth ) /

Im trying to rotate textures when I draw them. I figured it would make more sense to do this than to rotate the images 90 degrees in paint.net and save them in different files. I looked thought the api documentation for spritebatch drawing arguments but I just dont understand. There are a bunch of arguments such as srcX, srcY, originX and so on. Also i would like to know how to do the same for texture regions. Heres a link to the api documentation page: http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g2d/SpriteBatch.html Thank you! again from the documentation ,

i would like to mix camera preview SurfaceTexture with some overlay texture. I am using these shaders for processing: private final String vss = "attribute vec2 vPosition;\n" + "attribute vec2 vTexCoord;\n" + "varying vec2 texCoord;\n" + "void main() {\n" + " texCoord = vTexCoord;\n" + " gl_Position = vec4 ( vPosition.x, vPosition.y, 0.0, 1.0 );\n" + "}"; private final String fss = "#extension GL_OES_EGL_image_external : require\n" + "precision mediump float;\n" + "uniform samplerExternalOES sTexture;\n" + "uniform sampler2D filterTexture;\n" + "varying vec2 texCoord;\n" + "void main() {\n" +"

The msdn documentation explains that in directx 11 there are multiple ways to fill a directx 11 texture programmatically: (1) Create the texture with default usage texture and initialize it with data from memory (2) Create the texture with dynamic usage, use DeviceContext Map to get a pointer to texture memory, write to it, then use Unmap to indicate you are done (at which point I guess it is copied to the gpu) (3) Create the texture with staging usage and follow same steps as for dynamic texture, but follow that with a call to ID3D11DeviceContext.CopyResource to use this staging texture to in

I have seen many code samples for loading textures for OpenGL , many of them a bit complicated to understand or requiring new functions with a lot of code. I was thinking that as OpenCV allows us to load any image format it can be a simple an efficient way to load textures to OpenGL , but I am missing something. I have this piece of code in c++ : cv::Mat texture_cv; GLuint texture[1]; int Status=FALSE; if( texture_cv = imread("stones.jpg")) { Status=TRUE; // Set The Status To TRUE glGenTextures(1, &texture[0]); // Create The Texture glBindTexture(GL_TEXTURE_2D, texture[0]); glTexParameterf(GL

I'm trying to draw a subregion of a texture in OpenGL by specifying the coordinates I want. What's happening though is that, depending on the size of the image, it seems there's a slight offset in the origin of where it selects the texture coordinates. The offset amount seems to be less than the size of a pixel & the output is is blurred combination of neighboring pixels. Here's an idea of what I'm describing. In this case I'd want to select the 6x5 green/white region but what OpenGL is rendering includes a slight pink tint to the top & left pixels. What the output would look like: I can fix