Image Format - OpenGL Wiki - Khronos Group
https://www.khronos.org/opengl/wiki/Image_Format
GL_TEXTURE_COMPRESSED_BLOCK_WIDTH, GL_TEXTURE_COMPRESSED_BLOCK_HEIGHT Compressed image formats tend to have their data organized into blocks, which are the smallest individual unit of a compressed texture. These enums return the width and height of a block in this compressed image format. If the format is …
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