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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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14
src/image_encode.cpp
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@@ -490,7 +490,7 @@ namespace bimg
return rgba[3];
}
float imageAlphaTestCoverage(TextureFormat::Enum _format, uint32_t _width, uint32_t _height, uint32_t _srcPitch, const void* _src, float _alphaRef, float _scale)
float imageAlphaTestCoverage(TextureFormat::Enum _format, uint32_t _width, uint32_t _height, uint32_t _srcPitch, const void* _src, float _alphaRef, float _scale, uint32_t _upscale)
{
UnpackFn unpack = getUnpack(_format);
if (NULL == unpack)
@@ -501,7 +501,8 @@ namespace bimg
float coverage = 0.0f;
const uint8_t* src = (const uint8_t*)_src;
const uint32_t xstep = getBitsPerPixel(_format) / 8;
const float numSamples = 8.0f;
const uint32_t numSamples = _upscale;
const float sampleStep = 1.0f / numSamples;
for (uint32_t yy = 0, ystep = _srcPitch; yy < _height-1; ++yy, src += ystep)
{
@@ -513,9 +514,9 @@ namespace bimg
float alpha01 = _scale * getAlpha(unpack, data+ystep);
float alpha11 = _scale * getAlpha(unpack, data+ystep+xstep);
for (float fy = 0.5f/numSamples; fy < 1.0f; fy += 1.0f)
for (float fy = 0.0f; fy < 1.0f; fy += sampleStep)
{
for (float fx = 0.5f/numSamples; fx < 1.0f; fx += 1.0f)
for (float fx = 0.0f; fx < 1.0f; fx += sampleStep)
{
float alpha = 0.0f
+ alpha00 * (1.0f - fx) * (1.0f - fy)
@@ -536,7 +537,7 @@ namespace bimg
return coverage / float(_width*_height*numSamples*numSamples);
}
void imageScaleAlphaToCoverage(TextureFormat::Enum _format, uint32_t _width, uint32_t _height, uint32_t _srcPitch, void* _src, float _desiredCoverage, float _alphaRef)
void imageScaleAlphaToCoverage(TextureFormat::Enum _format, uint32_t _width, uint32_t _height, uint32_t _srcPitch, void* _src, float _desiredCoverage, float _alphaRef, uint32_t _upscale)
{
PackFn pack = getPack(_format);
UnpackFn unpack = getUnpack(_format);
@@ -550,7 +551,7 @@ namespace bimg
float max = 4.0f;
float scale = 1.0f;
for (uint32_t ii = 0; ii < 8; ++ii)
for (uint32_t ii = 0; ii < 10; ++ii)
{
float coverage = imageAlphaTestCoverage(
_format
@@ -560,6 +561,7 @@ namespace bimg
, _src
, _alphaRef
, scale
, _upscale
);
if (coverage < _desiredCoverage)