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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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21
irr/src/COpenGLDriver.cpp
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@@ -2614,10 +2614,6 @@ ITexture *COpenGLDriver::addRenderTargetTextureMs(const core::dimension2d<u32> &
if (IImage::isCompressedFormat(format))
return 0;
// disable mip-mapping
bool generateMipLevels = getTextureCreationFlag(ETCF_CREATE_MIP_MAPS);
setTextureCreationFlag(ETCF_CREATE_MIP_MAPS, false);
bool supportForFBO = (Feature.ColorAttachment > 0);
core::dimension2du destSize(size);
@@ -2631,9 +2627,6 @@ ITexture *COpenGLDriver::addRenderTargetTextureMs(const core::dimension2d<u32> &
addTexture(renderTargetTexture);
renderTargetTexture->drop();
// restore mip-mapping
setTextureCreationFlag(ETCF_CREATE_MIP_MAPS, generateMipLevels);
return renderTargetTexture;
}
@@ -2643,10 +2636,6 @@ ITexture *COpenGLDriver::addRenderTargetTextureCubemap(const u32 sideLen, const
if (IImage::isCompressedFormat(format))
return 0;
// disable mip-mapping
bool generateMipLevels = getTextureCreationFlag(ETCF_CREATE_MIP_MAPS);
setTextureCreationFlag(ETCF_CREATE_MIP_MAPS, false);
bool supportForFBO = (Feature.ColorAttachment > 0);
const core::dimension2d<u32> size(sideLen, sideLen);
@@ -2661,9 +2650,6 @@ ITexture *COpenGLDriver::addRenderTargetTextureCubemap(const u32 sideLen, const
addTexture(renderTargetTexture);
renderTargetTexture->drop();
// restore mip-mapping
setTextureCreationFlag(ETCF_CREATE_MIP_MAPS, generateMipLevels);
return renderTargetTexture;
}
@@ -2682,6 +2668,13 @@ bool COpenGLDriver::setRenderTargetEx(IRenderTarget *target, u16 clearFlag, SCol
return false;
}
if (CurrentRenderTarget) {
// Update mip-map of the generated texture, if enabled.
auto textures = CurrentRenderTarget->getTexture();
for (size_t i = 0; i < textures.size(); ++i)
textures[i]->regenerateMipMapLevels();
}
bool supportForFBO = (Feature.ColorAttachment > 0);
core::dimension2d<u32> destRenderTargetSize(0, 0);