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astc: Hard code bit depth changes to 8 and use fast replicate
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@ -759,10 +759,10 @@ public:
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// significant bits when going from larger to smaller bit depth
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// or by repeating the most significant bits when going from
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// smaller to larger bit depths.
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void ChangeBitDepth(const u8 (&depth)[4]) {
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void ChangeBitDepth() {
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for (u32 i = 0; i < 4; i++) {
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Component(i) = ChangeBitDepth(Component(i), m_BitDepth[i], depth[i]);
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m_BitDepth[i] = depth[i];
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Component(i) = ChangeBitDepth(Component(i), m_BitDepth[i]);
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m_BitDepth[i] = 8;
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}
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}
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@ -774,29 +774,24 @@ public:
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// Changes the bit depth of a single component. See the comment
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// above for how we do this.
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static ChannelType ChangeBitDepth(Pixel::ChannelType val, u8 oldDepth, u8 newDepth) {
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assert(newDepth <= 8);
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static ChannelType ChangeBitDepth(Pixel::ChannelType val, u8 oldDepth) {
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assert(oldDepth <= 8);
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if (oldDepth == newDepth) {
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if (oldDepth == 8) {
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// Do nothing
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return val;
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} else if (oldDepth == 0 && newDepth != 0) {
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return static_cast<ChannelType>((1 << newDepth) - 1);
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} else if (newDepth > oldDepth) {
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return Replicate(val, oldDepth, newDepth);
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} else if (oldDepth == 0) {
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return static_cast<ChannelType>((1 << 8) - 1);
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} else if (8 > oldDepth) {
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return static_cast<ChannelType>(FastReplicateTo8(static_cast<u32>(val), oldDepth));
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} else {
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// oldDepth > newDepth
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if (newDepth == 0) {
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return 0xFF;
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} else {
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u8 bitsWasted = static_cast<u8>(oldDepth - newDepth);
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const u8 bitsWasted = static_cast<u8>(oldDepth - 8);
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u16 v = static_cast<u16>(val);
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v = static_cast<u16>((v + (1 << (bitsWasted - 1))) >> bitsWasted);
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v = ::std::min<u16>(::std::max<u16>(0, v), static_cast<u16>((1 << newDepth) - 1));
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v = ::std::min<u16>(::std::max<u16>(0, v), static_cast<u16>((1 << 8) - 1));
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return static_cast<u8>(v);
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}
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}
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assert(false && "We shouldn't get here.");
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return 0;
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@ -845,8 +840,7 @@ public:
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// up in the most-significant byte.
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u32 Pack() const {
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Pixel eightBit(*this);
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const u8 eightBitDepth[4] = {8, 8, 8, 8};
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eightBit.ChangeBitDepth(eightBitDepth);
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eightBit.ChangeBitDepth();
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u32 r = 0;
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r |= eightBit.A();
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