What is texelFetch?
What is texelFetch?
Description. texelFetch performs a lookup of a single texel from texture coordinate P in the texture bound to sampler . The array layer is specified in the last component of P for array forms. The lod parameter (if present) specifies the level-of-detail from which the texel will be fetched.
What is a GL texture?
A texture is an OpenGL Object that contains one or more images that all have the same image format. A texture can be used in two ways: it can be the source of a texture access from a Shader, or it can be used as a render target.
What is Gl_texture_mag_filter?
GL_TEXTURE_MIN_FILTER. The texture minifying function is used whenever the pixel being textured maps to an area greater than one texture element. There are six defined minifying functions. Two of them use the nearest one or nearest four texture elements to compute the texture value.
What is Bindless texture?
Bindless Textures are a method for having Shaders use a Texture by an integer number rather than by binding them to the OpenGL Context. These texture can be used by samplers or images.
What is gl_PointCoord?
gl_PointCoord is a fragment language input variable that contains the two-dimensional coordinates indicating where within a point primitive the current fragment is located. s ranges from 0.0 to 1.0 across the point horizontally from left to right.
What is glActiveTexture?
Description. glActiveTexture selects which texture unit subsequent texture state calls will affect. The number of texture units an implementation supports is implementation dependent, but must be at least 80.
What is Gltexparameteri?
The glTexParameter function assigns the value or values in params to the texture parameter specified as pname. The target parameter defines the target texture, either GL_TEXTURE_1D or GL_TEXTURE_2D. As more texture elements are sampled in the minification process, fewer aliasing artifacts will be apparent.
How does texelfetch look up Texel from texture?
texelFetch performs a lookup of a single texel from texture coordinate P in the texture bound to sampler. The array layer is specified in the last component of P for array forms. The lod parameter (if present) specifies the level-of-detail from which the texel will be fetched.
What are the texture coordinates in Texel space?
For the texture coordinates, there are two kind of texture coordinates. One is normalized texture coordinates, which is in the range [0, 1]. The other is texel space, which is in the range [0, size), where size is the size of the texture.
What do the Lod and sample parameters do in texelfetch?
The lod parameter (if present) specifies the level-of-detail from which the texel will be fetched. The sample specifies which sample within the texel will be returned when reading from a multi-sample texure.