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Added GLSL 4.20 pack/unpackSnorm2x16

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This commit is contained in:
Christophe Riccio 2011-09-13 14:11:58 +01:00
parent d2e1718286
commit f4800e6fc2
2 changed files with 31 additions and 2 deletions
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13
glm/core/func_packing.hpp
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@ -54,6 +54,19 @@ namespace glm
/// @see - <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4</a>
detail::uint32 packUnorm2x16(detail::tvec2<detail::float32> const & v);
//! First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
//! Then, the results are packed into the returned 32-bit unsigned integer.
//!
//! The conversion for component c of v to fixed point is done as follows:
//! packSnorm2x16: round(clamp(c, 0, +1) * 65535.0)
//!
//! The first component of the vector will be written to the least significant bits of the output;
//! the last component will be written to the most significant bits.
//!
/// @see - <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/packSnorm2x16.xml">GLSL packSnorm2x16 man page</a>
/// @see - <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.4</a>
detail::uint32 packSnorm2x16(detail::tvec2<detail::float32> const & v);
//! First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.
//! Then, the results are packed into the returned 32-bit unsigned integer.
//!

16
glm/core/func_packing.inl
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@ -35,6 +35,13 @@ GLM_FUNC_QUALIFIER detail::uint32 packUnorm2x16(detail::tvec2<detail::float32> c
return detail::uint32((B << 16) | A);
}
GLM_FUNC_QUALIFIER detail::uint32 packSnorm2x16(detail::tvec2<detail::float32> const & v)
{
detail::uint16 A((detail::uint16)round(clamp(v.x,-1.0f, 1.0f) * 32767.0f));
detail::uint16 B((detail::uint16)round(clamp(v.y,-1.0f, 1.0f) * 32767.0f));
return detail::uint32((B << 16) | A);
}
GLM_FUNC_QUALIFIER detail::uint32 packUnorm4x8(detail::tvec4<detail::float32> const & v)
{
detail::uint8 A((detail::uint8)round(clamp(v.x, 0.0f, 1.0f) * 255.0f));
@ -62,6 +69,15 @@ GLM_FUNC_QUALIFIER detail::tvec2<detail::float32> unpackUnorm2x16(detail::uint32
B * 1.0f / 65535.0f);
}
GLM_FUNC_QUALIFIER detail::tvec2<detail::float32> unpackSnorm2x16(detail::uint32 const & p)
{
detail::uint16 A(detail::uint16(p >> 0));
detail::uint16 B(detail::uint16(p >> 16));
return clamp(detail::tvec2<detail::float32>(
A * 1.0f / 32767.0f,
B * 1.0f / 32767.0f));
}
GLM_FUNC_QUALIFIER detail::tvec4<detail::float32> unpackUnorm4x8(detail::uint32 const & p)
{
detail::uint8 A(detail::uint8(p >> 0));