153 lines
4.6 KiB
C++
153 lines
4.6 KiB
C++
namespace glm
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{
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template<typename genType>
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GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType identity()
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{
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return detail::init_gentype<genType, detail::genTypeTrait<genType>::GENTYPE>::identity();
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> translate(mat<4, 4, T, Q> const& m, vec<3, T, Q> const& v)
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{
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mat<4, 4, T, Q> Result(m);
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Result[3] = m[0] * v[0] + m[1] * v[1] + m[2] * v[2] + m[3];
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return Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> rotate(mat<4, 4, T, Q> const& m, T angle, vec<3, T, Q> const& v)
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{
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T const a = angle;
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T const c = cos(a);
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T const s = sin(a);
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vec<3, T, Q> axis(normalize(v));
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vec<3, T, Q> temp((T(1) - c) * axis);
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mat<4, 4, T, Q> Rotate;
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Rotate[0][0] = c + temp[0] * axis[0];
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Rotate[0][1] = temp[0] * axis[1] + s * axis[2];
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Rotate[0][2] = temp[0] * axis[2] - s * axis[1];
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Rotate[1][0] = temp[1] * axis[0] - s * axis[2];
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Rotate[1][1] = c + temp[1] * axis[1];
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Rotate[1][2] = temp[1] * axis[2] + s * axis[0];
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Rotate[2][0] = temp[2] * axis[0] + s * axis[1];
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Rotate[2][1] = temp[2] * axis[1] - s * axis[0];
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Rotate[2][2] = c + temp[2] * axis[2];
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mat<4, 4, T, Q> Result;
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Result[0] = m[0] * Rotate[0][0] + m[1] * Rotate[0][1] + m[2] * Rotate[0][2];
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Result[1] = m[0] * Rotate[1][0] + m[1] * Rotate[1][1] + m[2] * Rotate[1][2];
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Result[2] = m[0] * Rotate[2][0] + m[1] * Rotate[2][1] + m[2] * Rotate[2][2];
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Result[3] = m[3];
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return Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> rotate_slow(mat<4, 4, T, Q> const& m, T angle, vec<3, T, Q> const& v)
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{
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T const a = angle;
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T const c = cos(a);
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T const s = sin(a);
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mat<4, 4, T, Q> Result;
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vec<3, T, Q> axis = normalize(v);
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Result[0][0] = c + (static_cast<T>(1) - c) * axis.x * axis.x;
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Result[0][1] = (static_cast<T>(1) - c) * axis.x * axis.y + s * axis.z;
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Result[0][2] = (static_cast<T>(1) - c) * axis.x * axis.z - s * axis.y;
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Result[0][3] = static_cast<T>(0);
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Result[1][0] = (static_cast<T>(1) - c) * axis.y * axis.x - s * axis.z;
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Result[1][1] = c + (static_cast<T>(1) - c) * axis.y * axis.y;
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Result[1][2] = (static_cast<T>(1) - c) * axis.y * axis.z + s * axis.x;
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Result[1][3] = static_cast<T>(0);
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Result[2][0] = (static_cast<T>(1) - c) * axis.z * axis.x + s * axis.y;
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Result[2][1] = (static_cast<T>(1) - c) * axis.z * axis.y - s * axis.x;
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Result[2][2] = c + (static_cast<T>(1) - c) * axis.z * axis.z;
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Result[2][3] = static_cast<T>(0);
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Result[3] = vec<4, T, Q>(0, 0, 0, 1);
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return m * Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> scale(mat<4, 4, T, Q> const& m, vec<3, T, Q> const& v)
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{
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mat<4, 4, T, Q> Result;
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Result[0] = m[0] * v[0];
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Result[1] = m[1] * v[1];
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Result[2] = m[2] * v[2];
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Result[3] = m[3];
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return Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> scale_slow(mat<4, 4, T, Q> const& m, vec<3, T, Q> const& v)
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{
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mat<4, 4, T, Q> Result(T(1));
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Result[0][0] = v.x;
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Result[1][1] = v.y;
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Result[2][2] = v.z;
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return m * Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> lookAtRH(vec<3, T, Q> const& eye, vec<3, T, Q> const& center, vec<3, T, Q> const& up)
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{
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vec<3, T, Q> const f(normalize(center - eye));
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vec<3, T, Q> const s(normalize(cross(f, up)));
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vec<3, T, Q> const u(cross(s, f));
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mat<4, 4, T, Q> Result(1);
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Result[0][0] = s.x;
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Result[1][0] = s.y;
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Result[2][0] = s.z;
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Result[0][1] = u.x;
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Result[1][1] = u.y;
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Result[2][1] = u.z;
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Result[0][2] =-f.x;
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Result[1][2] =-f.y;
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Result[2][2] =-f.z;
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Result[3][0] =-dot(s, eye);
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Result[3][1] =-dot(u, eye);
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Result[3][2] = dot(f, eye);
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return Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> lookAtLH(vec<3, T, Q> const& eye, vec<3, T, Q> const& center, vec<3, T, Q> const& up)
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{
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vec<3, T, Q> const f(normalize(center - eye));
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vec<3, T, Q> const s(normalize(cross(up, f)));
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vec<3, T, Q> const u(cross(f, s));
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mat<4, 4, T, Q> Result(1);
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Result[0][0] = s.x;
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Result[1][0] = s.y;
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Result[2][0] = s.z;
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Result[0][1] = u.x;
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Result[1][1] = u.y;
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Result[2][1] = u.z;
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Result[0][2] = f.x;
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Result[1][2] = f.y;
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Result[2][2] = f.z;
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Result[3][0] = -dot(s, eye);
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Result[3][1] = -dot(u, eye);
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Result[3][2] = -dot(f, eye);
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return Result;
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}
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template<typename T, qualifier Q>
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GLM_FUNC_QUALIFIER mat<4, 4, T, Q> lookAt(vec<3, T, Q> const& eye, vec<3, T, Q> const& center, vec<3, T, Q> const& up)
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{
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GLM_IF_CONSTEXPR(GLM_CONFIG_CLIP_CONTROL & GLM_CLIP_CONTROL_LH_BIT)
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return lookAtLH(eye, center, up);
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else
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return lookAtRH(eye, center, up);
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}
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}//namespace glm
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