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Add scaled mip-chain for sdf textures

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This commit is contained in:
william7ba
2018-12-17 16:38:54 -08:00
parent 756a62fc02
commit a4d5eb104e
4 changed files with 91 additions and 10 deletions
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83
tools/texturec/texturec.cpp
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@@ -620,10 +620,10 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
, bimg::TextureFormat::R8
);
temp = BX_ALLOC(_allocator, size);
uint8_t* rgba = (uint8_t*)temp;
uint8_t* r8 = (uint8_t*)temp;
bimg::imageDecodeToR8(_allocator
, rgba
, r8
, mip.m_data
, mip.m_width
, mip.m_height
@@ -640,8 +640,85 @@ bimg::ImageContainer* convert(bx::AllocatorI* _allocator, const void* _inputData
, mip.m_width
, mip.m_height
, mip.m_width
, rgba
, r8
);
if (_options.mips) {
const float alphaRef = 0.5f;
float coverage = bimg::imageAlphaTestCoverage(bimg::TextureFormat::A8
, mip.m_width
, mip.m_height
, mip.m_width
, r8
, alphaRef
);
size = bimg::imageGetSize(
NULL
, uint16_t(dstMip.m_width)
, uint16_t(dstMip.m_height)
, uint16_t(dstMip.m_depth)
, false
, false
, 1
, bimg::TextureFormat::RGBA8
);
void* rgbaTemp = BX_ALLOC(_allocator, size);
uint8_t* rgba = (uint8_t*)rgbaTemp;
bimg::imageDecodeToRgba8(
_allocator
, rgba
, dstMip.m_data
, dstMip.m_width
, dstMip.m_height
, dstMip.m_width * 4
, bimg::TextureFormat::A8
);
for (uint8_t lod = 1; lod < numMips && _err->isOk(); ++lod) {
bimg::imageRgba8Downsample2x2(rgba
, dstMip.m_width
, dstMip.m_height
, dstMip.m_depth
, dstMip.m_width * 4
, bx::strideAlign(dstMip.m_width / 2, blockWidth) * 4
, rgba
);
// For each mip, upscale to original size,
// scale image alpha to get same coverage as mip0
uint32_t upsample = 1 << lod;
uint32_t destWidth = dstMip.m_width / 2;
uint32_t destHeight = dstMip.m_height / 2;
bimg::imageScaleAlphaToCoverage(bimg::TextureFormat::RGBA8
, destWidth
, destHeight
, destWidth * 4
, rgba
, coverage
, alphaRef
, upsample
);
bimg::imageGetRawData(*output, side, lod, output->m_data, output->m_size, dstMip);
dstData = const_cast<uint8_t*>(dstMip.m_data);
bimg::imageEncodeFromRgba8(
_allocator
, dstData
, rgba
, dstMip.m_width
, dstMip.m_height
, dstMip.m_depth
, bimg::TextureFormat::A8
, _options.quality
, _err
);
}
BX_FREE(_allocator, rgbaTemp);
}
}
// RGBA8
else