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IrrlichtMt: Implement mip-mapping for RTTs (#16434)

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This can be helpful to draw fonts memory-efficiently at varying scales.

Adds ETCF_CREATE_RTT_MIP_MAPS to generate mip-maps on request.
This commit is contained in:
SmallJoker
2025-09-04 18:58:23 +02:00
committed by GitHub
parent e86d2fea8d
commit 024e1d2d27
5 changed files with 43 additions and 44 deletions
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12
irr/src/CNullDriver.cpp
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@@ -84,9 +84,17 @@ CNullDriver::CNullDriver(io::IFileSystem *io, const core::dimension2d<u32> &scre
InitMaterial2D.AntiAliasing = video::EAAM_OFF;
InitMaterial2D.ZWriteEnable = video::EZW_OFF;
InitMaterial2D.ZBuffer = video::ECFN_DISABLED;
InitMaterial2D.UseMipMaps = false;
InitMaterial2D.forEachTexture([](auto &tex) {
InitMaterial2D.UseMipMaps = true;
InitMaterial2D.forEachTexture([](video::SMaterialLayer &tex) {
// Best preset for 2D pixel-perfect graphics
tex.MinFilter = video::ETMINF_NEAREST_MIPMAP_NEAREST;
// Best preset for downscaled 2D graphics using trilinear interpolation
//tex.MinFilter = video::ETMINF_LINEAR_MIPMAP_LINEAR;
// Lower bias -> more crisp images, more jitter
// Higher bias -> burry images, less jitter
//tex.LODBias = -1;
tex.MagFilter = video::ETMAGF_NEAREST;
tex.TextureWrapU = video::ETC_REPEAT;
tex.TextureWrapV = video::ETC_REPEAT;