This demo uploads each mip level of a texture by hand, filling every level with a flat colour (red at level 0, then green, blue, yellow, white and magenta as the levels get smaller). A grid of textured cubes recedes into the distance so you can see exactly which level the sampler picks — the colour changes at each mip transition.
The uploaded levels are clamped with GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_MAX_LEVEL and GL_TEXTURE_MAX_LOD so only the hand-made levels are ever sampled.
uv run ShowMipmap/ShowMipmap.py
- L. Williams, "Pyramidal Parametrics", SIGGRAPH 1983 — ACM — the paper that introduced mip-mapping.
- glTexParameter — OpenGL Reference —
GL_TEXTURE_MIN_LOD/MAX_LOD/MAX_LEVELas used here. - LearnOpenGL — Textures — mipmap generation and the min-filter modes.