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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
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GPG key ID: B5690EEEBB952194
5 changed files with 43 additions and 44 deletions
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27
irr/src/COpenGLCoreTexture.h
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@ -103,14 +103,6 @@ public:
GL.TexParameteri(TextureType, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
GL.TexParameteri(TextureType, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
if (HasMipMaps) {
if (Driver->getTextureCreationFlag(ETCF_OPTIMIZED_FOR_SPEED))
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_FASTEST);
else if (Driver->getTextureCreationFlag(ETCF_OPTIMIZED_FOR_QUALITY))
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_NICEST);
else
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_DONT_CARE);
}
TEST_GL_ERROR(Driver);
initTexture(tmpImages->size());
@ -147,7 +139,7 @@ public:
DriverType = Driver->getDriverType();
assert(Type != ETT_2D_ARRAY); // not supported by this constructor
TextureType = TextureTypeIrrToGL(Type);
HasMipMaps = false;
HasMipMaps = Driver->getTextureCreationFlag(ETCF_CREATE_RTT_MIP_MAPS);
IsRenderTarget = true;
if (!name.empty())
@ -189,8 +181,9 @@ public:
char lbuf[200];
snprintf_irr(lbuf, sizeof(lbuf),
"COpenGLCoreTexture: RTT Type = %d Size = %dx%d (S:%d) ColorFormat = %s -> %#06x %#06x %#06x%s",
"COpenGLCoreTexture: RTT Type = %d Size = %dx%d (S:%d) ColorFormat = %s%s -> %#06x %#06x %#06x%s",
(int)Type, Size.Width, Size.Height, (int)MSAA, ColorFormatName(ColorFormat),
HasMipMaps ? " +Mip" : "",
InternalFormat, PixelFormat, PixelType, Converter ? " (c)" : ""
);
os::Printer::log(lbuf, ELL_DEBUG);
@ -397,13 +390,21 @@ public:
if (!HasMipMaps || (Size.Width <= 1 && Size.Height <= 1))
return;
const COpenGLCoreTexture *prevTexture = Driver->getCacheHandler()->getTextureCache().get(0);
Driver->getCacheHandler()->getTextureCache().set(0, this);
auto &cache = Driver->getCacheHandler()->getTextureCache();
const COpenGLCoreTexture *prevTexture = cache.get(0);
cache.set(0, this);
if (Driver->getTextureCreationFlag(ETCF_OPTIMIZED_FOR_SPEED))
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_FASTEST);
else if (Driver->getTextureCreationFlag(ETCF_OPTIMIZED_FOR_QUALITY))
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_NICEST);
else
GL.Hint(GL_GENERATE_MIPMAP_HINT, GL_DONT_CARE);
Driver->irrGlGenerateMipmap(TextureType);
TEST_GL_ERROR(Driver);
Driver->getCacheHandler()->getTextureCache().set(0, prevTexture);
cache.set(0, prevTexture);
}
GLenum getOpenGLTextureType() const