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Added (un)packUnorm and (un)packSnorm to GTC_packing

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This commit is contained in:
Christophe Riccio 2015-10-10 03:04:32 +02:00
parent 65c8f8fcf0
commit 04c8f05a34
3 changed files with 110 additions and 1 deletions
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28
glm/gtc/packing.hpp
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@ -515,6 +515,34 @@ namespace glm
template <precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<float, P> unpackHalf(vecType<uint16, P> const & p);
/// Convert each component of the normalized floating-point vector into unsigned integer values.
///
/// @see gtc_packing
/// @see vecType<floatType, P> unpackUnorm(vecType<intType, P> const & p);
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<uintType, P> packUnorm(vecType<floatType, P> const & v);
/// Convert each unsigned integer components of a vector to normalized floating-point values.
///
/// @see gtc_packing
/// @see vecType<intType, P> packUnorm(vecType<floatType, P> const & v)
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<floatType, P> unpackUnorm(vecType<uintType, P> const & v);
/// Convert each component of the normalized floating-point vector into signed integer values.
///
/// @see gtc_packing
/// @see vecType<floatType, P> unpackSnorm(vecType<intType, P> const & p);
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<intType, P> packSnorm(vecType<floatType, P> const & v);
/// Convert each signed integer components of a vector to normalized floating-point values.
///
/// @see gtc_packing
/// @see vecType<intType, P> packSnorm(vecType<floatType, P> const & v)
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_DECL vecType<floatType, P> unpackSnorm(vecType<intType, P> const & v);
/// @}
}// namespace glm

37
glm/gtc/packing.inl
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@ -36,6 +36,7 @@
#include "../vec4.hpp"
#include "../detail/type_half.hpp"
#include <cstring>
#include <limits>
namespace glm{
namespace detail
@ -616,4 +617,40 @@ namespace detail
{
return detail::compute_half<P, vecType>::unpack(v);
}
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<uintType, P> packUnorm(vecType<floatType, P> const & v)
{
static_assert(std::numeric_limits<uintType>::is_integer, "uintType must be an integer type");
static_assert(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<uintType, P>(round(clamp(v, static_cast<floatType>(0), static_cast<floatType>(1)) * static_cast<floatType>(std::numeric_limits<uintType>::max())));
}
template <typename uintType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<floatType, P> unpackUnorm(vecType<uintType, P> const & v)
{
static_assert(std::numeric_limits<uintType>::is_integer, "uintType must be an integer type");
static_assert(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<float, P>(v) * (static_cast<floatType>(1) / static_cast<floatType>(std::numeric_limits<uintType>::max()));
}
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<intType, P> packSnorm(vecType<floatType, P> const & v)
{
static_assert(std::numeric_limits<intType>::is_integer, "uintType must be an integer type");
static_assert(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return vecType<intType, P>(round(clamp(v , static_cast<floatType>(-1), static_cast<floatType>(1)) * static_cast<floatType>(std::numeric_limits<intType>::max())));
}
template <typename intType, typename floatType, precision P, template <typename, precision> class vecType>
GLM_FUNC_QUALIFIER vecType<floatType, P> unpackSnorm(vecType<intType, P> const & v)
{
static_assert(std::numeric_limits<intType>::is_integer, "uintType must be an integer type");
static_assert(std::numeric_limits<floatType>::is_iec559, "floatType must be a floating point type");
return clamp(vecType<floatType, P>(v) * (static_cast<floatType>(1) / static_cast<floatType>(std::numeric_limits<intType>::max())), static_cast<floatType>(-1), static_cast<floatType>(1));
}
}//namespace glm

44
test/gtc/gtc_packing.cpp
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@ -529,10 +529,54 @@ int test_packSnorm4x8()
return Error;
}
int test_packUnorm()
{
int Error = 0;
std::vector<glm::vec2> A;
A.push_back(glm::vec2(1.0f, 0.7f));
A.push_back(glm::vec2(0.5f, 0.1f));
for(std::size_t i = 0; i < A.size(); ++i)
{
glm::vec2 B(A[i]);
glm::u16vec2 C = glm::packUnorm<glm::uint16>(B);
glm::vec2 D = glm::unpackUnorm<glm::uint16, float>(C);
Error += glm::all(glm::epsilonEqual(B, D, 1.0f / 255.f)) ? 0 : 1;
assert(!Error);
}
return Error;
}
int test_packSnorm()
{
int Error = 0;
std::vector<glm::vec2> A;
A.push_back(glm::vec2( 1.0f, 0.0f));
A.push_back(glm::vec2(-0.5f,-0.7f));
A.push_back(glm::vec2(-0.1f, 0.1f));
for(std::size_t i = 0; i < A.size(); ++i)
{
glm::vec2 B(A[i]);
glm::i16vec2 C = glm::packSnorm<glm::int16>(B);
glm::vec2 D = glm::unpackSnorm<glm::int16, float>(C);
Error += glm::all(glm::epsilonEqual(B, D, 1.0f / 32767.0f * 2.0f)) ? 0 : 1;
assert(!Error);
}
return Error;
}
int main()
{
int Error(0);
Error += test_packUnorm();
Error += test_packSnorm();
Error += test_packSnorm1x16();
Error += test_packSnorm2x16();
Error += test_packSnorm4x16();