Mipmapping
Mipmapping is a technique in image processing that takes an original, high-resolution texture image and scales it into multiple smaller-resolution textures.
MIP level is each scaled down texture. For example, let original texture has size 128x128. Then original size is level 0, 64x64 is level 1, 32x32 is level 2 and so on.
These scaled textures are used to represent colors and textures more naturally when being viewed from a distance. It also reduces the load on the processor.
| function |
description |
| glGenerateMipmap(target) |
Generates mipmaps for the specified target. Possible values of target are:
- GL_TEXTURE_1D
- GL_TEXTURE_2D
- GL_TEXTURE_3D
- GL_TEXTURE_1D_ARRAY
- GL_TEXTURE_2D_ARRAY
- GL_TEXTURE_CUBE_MAP
- GL_TEXTURE_CUBE_MAP_ARRAY
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| glGenerateTextureMipmap(idTexture) |
Generates mipmaps for the specified texture object. |
| glTexParameter(target, pName, pValue) |
Regard to mipmapping you can set GL_TEXTURE_MIN_FILTER parameter with one of the following values:
- GL_NEAREST_MIPMAP_NEAREST - chooses the mipmap that most closely matches the size of the pixel being textured and uses the GL_NEAREST criterion to produce a texture value.
- GL_LINEAR_MIPMAP_NEAREST - chooses the mipmap that most closely matches the size of the pixel being textured and uses the GL_LINEAR criterion to produce a texture value.
- GL_NEAREST_MIPMAP_LINEAR - chooses the two mipmaps that most closely match the size of the pixel being textured and uses the GL_NEAREST criterion to produce a texture value from each mipmap. The final texture value is a weighted average of those two values.
- GL_LINEAR_MIPMAP_LINEAR - chooses the two mipmaps that most closely match the size of the pixel being textured and uses the GL_LINEAR criterion to produce a texture value from each mipmap. The final texture value is a weighted average of those two values.
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