75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/// @ref gtx
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/// @file glm/gtx/scalar_multiplication.hpp
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/// @author Joshua Moerman
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///
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/// Include <glm/gtx/scalar_multiplication.hpp> to use the features of this extension.
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///
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/// Enables scalar multiplication for all types
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///
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/// Since GLSL is very strict about types, the following (often used) combinations do not work:
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/// double * vec4
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/// int * vec4
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/// vec4 / int
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/// So we'll fix that! Of course "float * vec4" should remain the same (hence the enable_if magic)
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#pragma once
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#include "../detail/setup.hpp"
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#ifndef GLM_ENABLE_EXPERIMENTAL
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# error "GLM: GLM_GTX_scalar_multiplication is an experimental extension and may change in the future. Use #define GLM_ENABLE_EXPERIMENTAL before including it, if you really want to use it."
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#endif
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#if !GLM_HAS_TEMPLATE_ALIASES && !(GLM_COMPILER & GLM_COMPILER_GCC)
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# error "GLM_GTX_scalar_multiplication requires C++11 support or alias templates and if not support for GCC"
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#endif
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#include "../vec2.hpp"
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#include "../vec3.hpp"
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#include "../vec4.hpp"
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#include "../mat2x2.hpp"
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#include <type_traits>
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namespace glm
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{
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template<typename T, typename Vec>
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using return_type_scalar_multiplication = typename std::enable_if<
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!std::is_same<T, float>::value // T may not be a float
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&& std::is_arithmetic<T>::value, Vec // But it may be an int or double (no vec3 or mat3, ...)
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>::type;
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#define GLM_IMPLEMENT_SCAL_MULT(Vec) \
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template<typename T> \
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return_type_scalar_multiplication<T, Vec> \
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operator*(T const& s, Vec rh){ \
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return rh *= static_cast<float>(s); \
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} \
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\
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template<typename T> \
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return_type_scalar_multiplication<T, Vec> \
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operator*(Vec lh, T const& s){ \
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return lh *= static_cast<float>(s); \
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} \
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\
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template<typename T> \
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return_type_scalar_multiplication<T, Vec> \
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operator/(Vec lh, T const& s){ \
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return lh *= 1.0f / s; \
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}
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GLM_IMPLEMENT_SCAL_MULT(vec2)
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GLM_IMPLEMENT_SCAL_MULT(vec3)
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GLM_IMPLEMENT_SCAL_MULT(vec4)
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GLM_IMPLEMENT_SCAL_MULT(mat2)
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GLM_IMPLEMENT_SCAL_MULT(mat2x3)
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GLM_IMPLEMENT_SCAL_MULT(mat2x4)
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GLM_IMPLEMENT_SCAL_MULT(mat3x2)
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GLM_IMPLEMENT_SCAL_MULT(mat3)
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GLM_IMPLEMENT_SCAL_MULT(mat3x4)
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GLM_IMPLEMENT_SCAL_MULT(mat4x2)
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GLM_IMPLEMENT_SCAL_MULT(mat4x3)
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GLM_IMPLEMENT_SCAL_MULT(mat4)
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#undef GLM_IMPLEMENT_SCAL_MULT
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} // namespace glm
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