Example
You can read texture data with function glGetTexImage:
char *outBuffer = malloc(buf_size);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
glGetTexImage(GL_TEXTURE_2D,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
outBuffer);
Note: texture type and format are only for example and can be different.
