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texturec: Added mip-map gen.

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This commit is contained in:
Branimir Karadžić 2015-12-31 20:05:00 -08:00
parent b70dba4c8e
commit 026a2563f1
3 changed files with 62 additions and 5 deletions
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31
src/image.cpp
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@ -238,6 +238,37 @@ namespace bgfx
return TextureFormat::Unknown;
}
uint8_t imageGetNumMips(TextureFormat::Enum _format, uint16_t _width, uint16_t _height, uint16_t _depth)
{
const ImageBlockInfo& blockInfo = getBlockInfo(_format);
const uint8_t bpp = blockInfo.bitsPerPixel;
const uint16_t blockWidth = blockInfo.blockWidth;
const uint16_t blockHeight = blockInfo.blockHeight;
const uint16_t minBlockX = blockInfo.minBlockX;
const uint16_t minBlockY = blockInfo.minBlockY;
_width = bx::uint16_max(blockWidth * minBlockX, ( (_width + blockWidth - 1) / blockWidth)*blockWidth);
_height = bx::uint16_max(blockHeight * minBlockY, ( (_height + blockHeight - 1) / blockHeight)*blockHeight);
_depth = bx::uint16_max(1, _depth);
uint8_t numMips = 0;
for (uint32_t width = _width, height = _height, depth = _depth
; blockWidth < width && blockHeight < height && 1 < depth
; ++numMips)
{
width = bx::uint32_max(blockWidth * minBlockX, ( (width + blockWidth - 1) / blockWidth )*blockWidth);
height = bx::uint32_max(blockHeight * minBlockY, ( (height + blockHeight - 1) / blockHeight)*blockHeight);
depth = bx::uint32_max(1, depth);
width >>= 1;
height >>= 1;
depth >>= 1;
}
return numMips;
}
uint32_t imageGetSize(TextureFormat::Enum _format, uint16_t _width, uint16_t _height, uint16_t _depth, bool _cubeMap, uint8_t _numMips)
{
const ImageBlockInfo& blockInfo = getBlockInfo(_format);

3
src/image.h
View file

@ -90,6 +90,9 @@ namespace bgfx
/// Converts string to format.
TextureFormat::Enum getFormat(const char* _name);
/// Returns number of mip-maps required for complete mip-map chain.
uint8_t imageGetNumMips(TextureFormat::Enum _format, uint16_t _width, uint16_t _height, uint16_t _depth = 0);
/// Returns image size.
uint32_t imageGetSize(TextureFormat::Enum _format, uint16_t _width, uint16_t _height, uint16_t _depth = 0, bool _cubeMap = false, uint8_t _numMips = 0);

33
tools/texturec/texturec.cpp
View file

@ -123,6 +123,10 @@ namespace bgfx
case TextureFormat::PTC24:
break;
case TextureFormat::BGRA8:
imageSwizzleBgra8(_width, _height, _width*4, _src, _dst);
break;
case TextureFormat::RGBA8:
memcpy(_dst, _src, _width*_height*4);
break;
@ -259,7 +263,6 @@ int main(int _argc, const char* _argv[])
}
}
BX_UNUSED(mips);
if (loaded)
{
bx::CrtAllocator allocator;
@ -271,16 +274,36 @@ int main(int _argc, const char* _argv[])
uint32_t size = imageGetSize(TextureFormat::RGBA8, mip.m_width, mip.m_height);
uint8_t* rgba = (uint8_t*)BX_ALLOC(&allocator, size);
imageDecodeToRgba8(rgba, mip.m_data, mip.m_width, mip.m_height, mip.m_width*mip.m_bpp/8, mip.m_format);
imageDecodeToRgba8(rgba
, mip.m_data
, mip.m_width
, mip.m_height
, mip.m_width*mip.m_bpp/8
, mip.m_format
);
imageContainer.m_size = imageGetSize(format, mip.m_width, mip.m_height);
uint8_t numMips = mips
? imageGetNumMips(format, mip.m_width, mip.m_height)
: 1
;
imageContainer.m_size = imageGetSize(format, mip.m_width, mip.m_height, 0, false, numMips);
imageContainer.m_format = format;
output = alloc(imageContainer.m_size);
// bgfx::imageRgba8Downsample2x2(width, height, pitch, data, data);
imageEncodeFromRgba8(output->data, rgba, mip.m_width, mip.m_height, format);
for (uint8_t lod = 1; lod < numMips; ++lod)
{
ImageMip mip1;
imageGetRawData(imageContainer, 0, lod, output->data, output->size, mip1);
uint8_t* data = const_cast<uint8_t*>(mip1.m_data);
uint32_t width = bx::uint32_max(1, mip.m_width >>lod);
uint32_t height = bx::uint32_max(1, mip.m_height>>lod);
imageRgba8Downsample2x2(width, height, width*4, rgba, rgba);
imageEncodeFromRgba8(data, rgba, mip.m_width, mip.m_height, format);
}
BX_FREE(&allocator, rgba);
}