Optimized packing and unpacking functions
This commit is contained in:
Christophe Riccio
parent
804078f690
commit
cd186dadb3
@ -30,169 +30,80 @@ namespace glm
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{
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GLM_FUNC_QUALIFIER uint32 packUnorm2x16(vec2 const & v)
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{
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uint16 A(uint16(round(clamp(v.x, 0.0f, 1.0f) * 65535.0f)));
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uint16 B(uint16(round(clamp(v.y, 0.0f, 1.0f) * 65535.0f)));
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return uint32((B << 16) | A);
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u16vec2 Topack(round(clamp(v, 0.0f, 1.0f) * 65535.0f));
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return *reinterpret_cast<uint32*>(&Topack);
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}
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GLM_FUNC_QUALIFIER vec2 unpackUnorm2x16(uint32 const & p)
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{
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uint32 Mask16((1 << 16) - 1);
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uint32 A((p >> 0) & Mask16);
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uint32 B((p >> 16) & Mask16);
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return vec2(A, B) * float(1.5259021896696421759365224689097e-5); // 1.0 / 65535.0
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vec2 Unpack(*reinterpret_cast<u16vec2*>(const_cast<uint32*>(&p)));
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return Unpack * float(1.5259021896696421759365224689097e-5); // 1.0 / 65535.0
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}
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GLM_FUNC_QUALIFIER uint32 packSnorm2x16(vec2 const & v)
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{
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i16vec2 Unpack(round(clamp(v ,-1.0f, 1.0f) * 32767.0f));
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u32vec2 Topack(*reinterpret_cast<u16vec2*>(&Unpack));
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return (Topack.y << 16) | (Topack.x << 0);
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i16vec2 Topack(round(clamp(v ,-1.0f, 1.0f) * 32767.0f));
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return *reinterpret_cast<uint32*>(&Topack);
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}
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GLM_FUNC_QUALIFIER vec2 unpackSnorm2x16(uint32 const & p)
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{
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union iu
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{
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int16 i;
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uint16 u;
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} A, B;
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uint32 Mask16((1 << 16) - 1);
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A.u = uint16((p >> 0) & Mask16);
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B.u = uint16((p >> 16) & Mask16);
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glm::vec2 Pack(A.i, B.i);
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return clamp(Pack * 1.0f / 32767.0f, -1.0f, 1.0f);
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vec2 Unpack(*reinterpret_cast<i16vec2*>(const_cast<uint32*>(&p)));
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return clamp(Unpack * 1.0f / 32767.0f, -1.0f, 1.0f);
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}
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GLM_FUNC_QUALIFIER uint32 packUnorm4x8(vec4 const & v)
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{
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uint8 A((uint8)round(clamp(v.x, 0.0f, 1.0f) * 255.0f));
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uint8 B((uint8)round(clamp(v.y, 0.0f, 1.0f) * 255.0f));
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uint8 C((uint8)round(clamp(v.z, 0.0f, 1.0f) * 255.0f));
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uint8 D((uint8)round(clamp(v.w, 0.0f, 1.0f) * 255.0f));
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return uint32((D << 24) | (C << 16) | (B << 8) | A);
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glm::u8vec4 Topack(round(clamp(v, 0.0f, 1.0f) * 255.0f));
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return *reinterpret_cast<uint32*>(&Topack);
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}
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GLM_FUNC_QUALIFIER vec4 unpackUnorm4x8(uint32 const & p)
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{
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uint32 Mask8((1 << 8) - 1);
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uint32 A((p >> 0) & Mask8);
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uint32 B((p >> 8) & Mask8);
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uint32 C((p >> 16) & Mask8);
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uint32 D((p >> 24) & Mask8);
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return glm::vec4(
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A * 1.0f / 255.0f,
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B * 1.0f / 255.0f,
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C * 1.0f / 255.0f,
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D * 1.0f / 255.0f);
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{
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glm::vec4 Unpack(*reinterpret_cast<glm::u8vec4*>(const_cast<uint32*>(&p)));
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return Unpack * 0.003921568627451f; // 1 / 255
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}
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GLM_FUNC_QUALIFIER uint32 packSnorm4x8(vec4 const & v)
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{
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union iu
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{
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int8 i;
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uint8 u;
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} A, B, C, D;
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glm::vec4 Unpack = clamp(v,-1.0f, 1.0f) * 127.0f;
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A.i = int8(round(Unpack.x));
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B.i = int8(round(Unpack.y));
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C.i = int8(round(Unpack.z));
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D.i = int8(round(Unpack.w));
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uint32 Pack = (uint32(D.u) << 24) | (uint32(C.u) << 16) | (uint32(B.u) << 8) | (uint32(A.u) << 0);
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return Pack;
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glm::i8vec4 Topack(round(clamp(v ,-1.0f, 1.0f) * 127.0f));
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return *reinterpret_cast<uint32*>(&Topack);
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}
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GLM_FUNC_QUALIFIER glm::vec4 unpackSnorm4x8(uint32 const & p)
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{
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union iu
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{
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int8 i;
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uint8 u;
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} A, B, C, D;
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uint32 Mask8((1 << 8) - 1);
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A.u = uint8((p >> 0) & Mask8);
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B.u = uint8((p >> 8) & Mask8);
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C.u = uint8((p >> 16) & Mask8);
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D.u = uint8((p >> 24) & Mask8);
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glm::vec4 Pack(A.i, B.i, C.i, D.i);
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return clamp(Pack * 1.0f / 127.0f, -1.0f, 1.0f);
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{
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glm::vec4 Unpack(*reinterpret_cast<glm::i8vec4*>(const_cast<uint32*>(&p)));
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return clamp(
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Unpack * 0.0078740157480315f, // 1.0f / 127.0f
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-1.0f, 1.0f);
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}
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GLM_FUNC_QUALIFIER double packDouble2x32(uvec2 const & v)
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{
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struct uint32_pair
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{
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uint32 x;
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uint32 y;
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};
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union helper
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{
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uint32_pair input;
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double output;
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} Helper;
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Helper.input.x = v.x;
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Helper.input.y = v.y;
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return Helper.output;
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//return *(double*)&v;
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return *reinterpret_cast<double*>(const_cast<uvec2*>(&v));
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}
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GLM_FUNC_QUALIFIER uvec2 unpackDouble2x32(double const & v)
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{
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struct uint32_pair
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{
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uint32 x;
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uint32 y;
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};
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union helper
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{
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double input;
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uint32_pair output;
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} Helper;
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Helper.input = v;
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return uvec2(Helper.output.x, Helper.output.y);
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return *reinterpret_cast<uvec2*>(const_cast<double*>(&v));
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}
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GLM_FUNC_QUALIFIER uint packHalf2x16(vec2 const & v)
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{
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union helper
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{
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uint other;
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struct
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{
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detail::hdata a, b;
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} orig;
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} Pack;
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i16vec2 Unpack(
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detail::toFloat16(v.x),
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detail::toFloat16(v.y));
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Pack.orig.a = detail::toFloat16(v.x);
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Pack.orig.b = detail::toFloat16(v.y);
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return Pack.other;
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return *reinterpret_cast<uint*>(&Unpack);
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}
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GLM_FUNC_QUALIFIER vec2 unpackHalf2x16(uint const & v)
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{
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union helper
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{
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uint other;
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struct
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{
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detail::hdata a, b;
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} orig;
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} Unpack;
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Unpack.other = v;
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return vec2(detail::toFloat32(Unpack.orig.a), detail::toFloat32(Unpack.orig.b));
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i16vec2 Unpack = *reinterpret_cast<i16vec2*>(const_cast<uint*>(&v));
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return vec2(
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detail::toFloat32(Unpack.x),
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detail::toFloat32(Unpack.y));
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}
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}//namespace glm
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@ -35,7 +35,7 @@ namespace detail
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// 11 bits => EEE EEFFFFFF
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// Half bits => SEEEEEFF FFFFFFFF
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// Float bits => SEEEEEEE EFFFFFFF FFFFFFFF FFFFFFFF
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// 0x00007c00 => 00000000 00000000 01111100 00000000
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// 0x000003ff => 00000000 00000000 00000011 11111111
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// 0x38000000 => 00111000 00000000 00000000 00000000
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@ -56,6 +56,7 @@ GLM 0.9.5.0: 2013-XX-XX
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- Uses C++ casts
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- Fixed .length() that should return a int and not a size_t
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- Removed unnecessary conversions
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- Optimized packing and unpacking functions
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================================================================================
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GLM 0.9.4.6: 2013-08-XX
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@ -41,12 +41,7 @@ int test_packUnorm2x16()
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int test_packSnorm2x16()
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{
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int Error = 0;
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/*
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std::vector<glm::hvec2> A;
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A.push_back(glm::hvec2(glm::half( 1.0f), glm::half( 0.0f)));
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A.push_back(glm::hvec2(glm::half(-0.5f), glm::half(-0.7f)));
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A.push_back(glm::hvec2(glm::half(-0.1f), glm::half( 0.1f)));
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*/
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std::vector<glm::vec2> A;
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A.push_back(glm::vec2( 1.0f, 0.0f));
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A.push_back(glm::vec2(-0.5f,-0.7f));
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