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Added support for .hdr image write.

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This commit is contained in:
Branimir Karadžić
2018-06-13 18:20:17 -07:00
parent 94a52c7122
commit 29a05c292b
3 changed files with 74 additions and 4 deletions
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41
src/image.cpp
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@@ -5000,6 +5000,47 @@ namespace bimg
return total;
}
int32_t imageWriteHdr(bx::WriterI* _writer, uint32_t _width, uint32_t _height, uint32_t _srcPitch, const void* _src, TextureFormat::Enum _format, bool _yflip, bx::Error* _err)
{
BX_ERROR_SCOPE(_err);
int32_t total = 0;
total += bx::write(_writer, "#?RADIANCE\n" , _err);
total += bx::write(_writer, "FORMAT=32-bit_rle_rgbe\n" , _err);
total += bx::write(_writer, '\n' , _err);
total += bx::writePrintf(_writer, "%cY %d +X %d\n", _yflip ? '+' : '-', _height, _width);
UnpackFn unpack = getUnpack(_format);
const uint32_t bpp = getBitsPerPixel(_format);
const uint8_t* data = (const uint8_t*)_src;
for (uint32_t yy = 0; yy < _height && _err->isOk(); ++yy)
{
for (uint32_t xx = 0; xx < _width && _err->isOk(); ++xx)
{
float rgba[4];
unpack(rgba, &data[xx*bpp/8]);
const float maxVal = bx::max(rgba[0], rgba[1], rgba[2]);
const float exp = bx::ceil(bx::log2(maxVal) );
const float toRgb8 = 255.0f * 1.0f/bx::ldexp(1.0f, int(exp) );
uint8_t rgbe[4];
rgbe[0] = uint8_t(rgba[0] * toRgb8);
rgbe[1] = uint8_t(rgba[1] * toRgb8);
rgbe[2] = uint8_t(rgba[2] * toRgb8);
rgbe[3] = uint8_t(exp+128.0f);
total += bx::write(_writer, rgbe, 4, _err);
}
data += _srcPitch;
}
return total;
}
static int32_t imageWriteDdsHeader(bx::WriterI* _writer, TextureFormat::Enum _format, bool _cubeMap, uint32_t _width, uint32_t _height, uint32_t _depth, uint8_t _numMips, bx::Error* _err)
{
BX_ERROR_SCOPE(_err);