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GL_ARB_get_texture_sub_image
https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_get_texture_sub_image.txt
GL_ARB_get_texture_sub_image
void glGetCompressedTextureSubImage (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLsizei bufSize, void *pixels)
void glGetTextureSubImage (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, GLsizei bufSize, void *pixels)
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