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Fixed and tested pack/unpackSnorm4x8 functions

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This commit is contained in:
Christophe Riccio 2011-09-14 09:05:28 +01:00
parent 0ab221458f
commit 321f89ff7a
2 changed files with 80 additions and 25 deletions
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49
glm/core/func_packing.inl
View File

@ -85,15 +85,6 @@ GLM_FUNC_QUALIFIER detail::uint32 packUnorm4x8(detail::tvec4<detail::float32> co
return detail::uint32((D << 24) | (C << 16) | (B << 8) | A);
}
GLM_FUNC_QUALIFIER detail::uint32 packSnorm4x8(detail::tvec4<detail::float32> const & v)
{
detail::uint8 A((detail::uint8)round(clamp(v.x,-1.0f, 1.0f) * 255.0f));
detail::uint8 B((detail::uint8)round(clamp(v.y,-1.0f, 1.0f) * 255.0f));
detail::uint8 C((detail::uint8)round(clamp(v.z,-1.0f, 1.0f) * 255.0f));
detail::uint8 D((detail::uint8)round(clamp(v.w,-1.0f, 1.0f) * 255.0f));
return detail::uint32((D << 24) | (C << 16) | (B << 8) | A);
}
GLM_FUNC_QUALIFIER detail::tvec4<detail::float32> unpackUnorm4x8(detail::uint32 const & p)
{
detail::uint8 A(detail::uint8(p >> 0));
@ -107,17 +98,39 @@ GLM_FUNC_QUALIFIER detail::tvec4<detail::float32> unpackUnorm4x8(detail::uint32
D * 1.0f / 255.0f);
}
GLM_FUNC_QUALIFIER detail::uint32 packSnorm4x8(detail::tvec4<detail::float32> const & v)
{
union iu
{
detail::int8 i;
detail::uint8 u;
} A, B, C, D;
detail::tvec4<detail::float32> Unpack = clamp(v ,-1.0f, 1.0f) * 127.0f;
A.i = detail::int8(round(Unpack.x));
B.i = detail::int8(round(Unpack.y));
C.i = detail::int8(round(Unpack.z));
D.i = detail::int8(round(Unpack.w));
detail::uint32 Pack = (detail::uint32(D.u) << 24) | (detail::uint32(C.u) << 16) | (detail::uint32(B.u) << 8) | (detail::uint32(A.u) << 0);
return Pack;
}
GLM_FUNC_QUALIFIER detail::tvec4<detail::float32> unpackSnorm4x8(detail::uint32 const & p)
{
detail::uint8 A(detail::uint8(p >> 0));
detail::uint8 B(detail::uint8(p >> 8));
detail::uint8 C(detail::uint8(p >> 16));
detail::uint8 D(detail::uint8(p >> 24));
return clamp(detail::tvec4<detail::float32>(
A * 1.0f / 127.0f,
B * 1.0f / 127.0f,
C * 1.0f / 127.0f,
D * 1.0f / 127.0f), -1.0f, 1.0f);
union iu
{
detail::int8 i;
detail::uint8 u;
} A, B, C, D;
detail::uint32 Mask8((1 << 8) - 1);
A.u = detail::uint8((p >> 0) & Mask8);
B.u = detail::uint8((p >> 8) & Mask8);
C.u = detail::uint8((p >> 16) & Mask8);
D.u = detail::uint8((p >> 24) & Mask8);
vec4 Pack(A.i, B.i, C.i, D.i);
return clamp(Pack, -1.0f, 1.0f);
}
GLM_FUNC_QUALIFIER double packDouble2x32(detail::tvec2<detail::uint32> const & v)

42
test/core/core_func_packing.cpp
View File

@ -55,6 +55,46 @@ int test_packSnorm2x16()
return Error;
}
int test_packUnorm4x8()
{
int Error = 0;
std::vector<glm::vec4> A;
A.push_back(glm::vec4(1.0f, 0.7f, 0.3f, 0.0f));
A.push_back(glm::vec4(0.5f, 0.1f, 0.2f, 0.3f));
for(std::size_t i = 0; i < A.size(); ++i)
{
glm::vec4 B(A[i]);
glm::uint32 C = glm::packUnorm4x8(B);
glm::vec4 D = glm::unpackUnorm4x8(C);
Error += glm::all(glm::equalEpsilon(B, D, 0.0001f)) ? 0 : 1;
assert(!Error);
}
return Error;
}
int test_packSnorm4x8()
{
int Error = 0;
std::vector<glm::vec4> A;
A.push_back(glm::vec4( 1.0f, 0.0f,-0.5f,-1.0f));
A.push_back(glm::vec4(-0.7f,-0.1f, 0.1f, 0.7f));
for(std::size_t i = 0; i < A.size(); ++i)
{
glm::vec4 B(A[i]);
glm::uint32 C = glm::packSnorm4x8(B);
glm::vec4 D = glm::unpackSnorm4x8(C);
Error += glm::all(glm::equalEpsilon(B, D, 0.0001f)) ? 0 : 1;
//assert(!Error);
}
return Error;
}
int test_packHalf2x16()
{
int Error = 0;
@ -99,6 +139,8 @@ int main()
{
int Error = 0;
Error += test_packSnorm4x8();
Error += test_packUnorm4x8();
Error += test_packSnorm2x16();
Error += test_packUnorm2x16();
Error += test_packHalf2x16();