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73 lines
2.1 KiB
73 lines
2.1 KiB
/// @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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/// @brief 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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