Merge branch 'feature/add-vec4-functionality'

src/naive/naive_vec4.h

@@ -89,4 +89,9 @@ inline bool approx_eq(vec4 a, vec4 b, float eps = 1e-6f) noexcept
 		&& std::fabs(a.w() - b.w()) <= eps;
 }
 
+[[nodiscard]] inline vec4 operator-(vec4 v) noexcept
+{
+	return { -v.x(), -v.y(), -v.z(), -v.w() };
+}
+
 }

src/tenvex/expressions/core.h

@@ -13,6 +13,12 @@
 namespace tnvx::detail
 {
 
+[[nodiscard]] TNVX_INLINE
+float to_float(vf4 v)
+{
+	return _mm_cvtss_f32(v);
+}
+
 [[nodiscard]] TNVX_INLINE
 bool eq(vf4 a, vf4 b)
 {
@@ -39,6 +45,12 @@ float get_lane(vf4 v) noexcept
 	return _mm_cvtss_f32(_mm_shuffle_ps(v, v, _MM_SHUFFLE(0, 0, 0, lane)));
 }
 
+[[nodiscard]] TNVX_INLINE
+vf4 neg(vf4 v) noexcept
+{
+	return _mm_xor_ps(v, _mm_set1_ps(-0.0f));
+}
+
 [[nodiscard]] TNVX_INLINE
 vf4 add(vf4 l, vf4 r) noexcept
 {

src/tenvex/expressions/dot3_impl.h

@@ -24,7 +24,7 @@ template<vec_expr L, vec_expr R>
 TNVX_INLINE
 Dot3<L, R>::operator float() const noexcept
 {
-	return _mm_cvtss_f32(eval());
+	return detail::to_float(eval());
 }
 
 template<vec_expr L, vec_expr R>

src/tenvex/expressions/neg.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "core.h"
+#include "expression.h"
+#include "traits.h"
+#include "concepts.h"
+
+namespace tnvx
+{
+
+template<expression E>
+struct Neg : Expr<Neg<E>>
+{
+	TNVX_INLINE
+	explicit Neg(const E& TNVX_RESTRICT e) noexcept;
+
+	[[nodiscard]] TNVX_INLINE
+	vf4 eval() const noexcept;
+
+	[[nodiscard]] TNVX_INLINE
+	operator float() const noexcept requires scalar_expr<E>;
+
+private:
+	tnvx_ref_or_value_t<E> _e;
+};
+
+template<vec_expr E> inline constexpr bool is_vec_expr<Neg<E>> = true;
+template<scalar_expr E> inline constexpr bool is_scalar_expr<Neg<E>> = true;
+
+template<expression E>
+[[nodiscard]] TNVX_INLINE
+Neg<E> operator-(const E& e) noexcept;
+
+}
+
+#include "neg_impl.hpp"

src/tenvex/expressions/neg_impl.hpp

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "neg.h"
+
+namespace tnvx
+{
+
+template<expression E>
+TNVX_INLINE
+tnvx::Neg<E>::Neg(const E& TNVX_RESTRICT e) noexcept
+	: _e(e)
+{
+}
+
+template<expression E>
+TNVX_INLINE
+vf4 Neg<E>::eval() const noexcept
+{
+	return detail::neg(_e.eval());
+}
+
+template<expression E>
+TNVX_INLINE
+Neg<E>::operator float() const noexcept requires scalar_expr<E>
+{
+	return detail::to_float(eval());
+}
+
+template<expression E>
+TNVX_INLINE
+Neg<E> operator-(const E& e) noexcept
+{
+	return Neg<E>(e);
+}
+
+}

src/tenvex/expressions/vec4.h

@@ -35,9 +35,6 @@ struct alignas(16) vec4 : Expr<vec4>
 	[[nodiscard]] TNVX_INLINE
 	vf4 eval() const noexcept;
 
-	[[nodiscard]] TNVX_INLINE
-	vec4 operator-() const noexcept;
-
 private:
 
 	vf4 _data;

src/tenvex/tenvex.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "expressions/neg.h"
 #include "expressions/add.h"
 #include "expressions/sub.h"
 #include "expressions/scalar.h"

src/tests/naive_tests.cpp

@@ -253,4 +253,34 @@ TEST(naive_vec4, cross_parallel)
 	EXPECT_TRUE(approx_eq(cross3(a, b), check));
 }
 
+TEST(naive_vec4, neg_basic)
+{
+	vec4 a = { 1.0f, -2.0f, 3.0f, -4.0f };
+	vec4 check = { -1.0f, 2.0f, -3.0f, 4.0f };
+
+	EXPECT_TRUE(approx_eq(-a, check));
+}
+
+TEST(naive_vec4, neg_zero)
+{
+	vec4 a = { 0.0f, 0.0f, 0.0f, 0.0f };
+
+	EXPECT_TRUE(approx_eq(-a, a));
+}
+
+TEST(naive_vec4, neg_double)
+{
+	vec4 a = { 1.0f, 2.0f, 3.0f, 4.0f };
+
+	EXPECT_TRUE(approx_eq(-(-a), a));
+}
+
+TEST(naive_vec4, neg_compound)
+{
+	vec4 a = { 5.0f, 3.0f, 1.0f, 0.0f };
+	vec4 b = { 2.0f, 1.0f, 4.0f, 0.0f };
+
+	EXPECT_TRUE(approx_eq(a + (-b), a - b));
+}
+
 }

src/tests/vec4_tests.cpp

@@ -257,8 +257,8 @@ TEST(vec4, dot3_times_literal_collapses)
 
 	auto r = dot3(a, b) * 2.0f;
 
-	static_assert(!std::is_same_v<decltype(r), float>);
-	static_assert(scalar_expr<decltype(r)>);
+	EXPECT_TRUE((!std::same_as<decltype(r), float>));
+	EXPECT_TRUE((scalar_expr<decltype(r)>));
 }
 
 TEST(vec4, magnitude3_times_literal_collapses)
@@ -267,8 +267,74 @@ TEST(vec4, magnitude3_times_literal_collapses)
 
 	auto r = magnitude3(a) * 2.0f;
 
-	static_assert(!std::is_same_v<decltype(r), float>);
-	static_assert(scalar_expr<decltype(r)>);
+	EXPECT_TRUE((!std::same_as<decltype(r), float>));
+	EXPECT_TRUE((scalar_expr<decltype(r)>));
+}
+
+TEST(vec4, neg_basic)
+{
+	vec4 a = { 1.0f, -2.0f, 3.0f, -4.0f };
+	vec4 check = { -1.0f, 2.0f, -3.0f, 4.0f };
+
+	EXPECT_TRUE(approx_eq(-a, check));
+}
+
+TEST(vec4, neg_zero)
+{
+	vec4 a = { 0.0f, 0.0f, 0.0f, 0.0f };
+
+	EXPECT_TRUE(approx_eq(-a, a));
+}
+
+TEST(vec4, neg_double)
+{
+	vec4 a = { 1.0f, 2.0f, 3.0f, 4.0f };
+
+	EXPECT_TRUE(approx_eq(-(-a), a));
+}
+
+TEST(vec4, neg_compound)
+{
+	vec4 a = { 5.0f, 3.0f, 1.0f, 0.0f };
+	vec4 b = { 2.0f, 1.0f, 4.0f, 0.0f };
+	vec4 check = { 3.0f, 2.0f, -3.0f, 0.0f };
+	vec4 result = a + (-b);
+
+	EXPECT_TRUE(approx_eq(check, result));
+}
+
+TEST(vec4, neg_expression)
+{
+	vec4 a = { 1.0f, 2.0f, 3.0f, 0.0f };
+	vec4 b = { 4.0f, 5.0f, 6.0f, 0.0f };
+	vec4 check = { -5.0f, -7.0f, -9.0f, 0.0f };
+	vec4 result = -(a + b);
+
+
+	EXPECT_TRUE((vec_expr<decltype(-(a + b))>));
+	EXPECT_TRUE(approx_eq(check, result));
+}
+
+TEST(vec4, neg_scalar_stays_lazy)
+{
+	vec4 a = { 1.0f, 0.0f, 0.0f, 0.0f };
+	vec4 b = { 1.0f, 0.0f, 0.0f, 0.0f };
+	float check = -1.0f;
+	float result = -dot3(a, b);
+
+	EXPECT_TRUE((scalar_expr<decltype(-dot3(a, b))>));
+	EXPECT_FLOAT_EQ(check, result);
+}
+
+TEST(vec4, neg_scalar_in_expression)
+{
+	vec4 a = { 2.0f, 0.0f, 0.0f, 0.0f };
+	vec4 b = { 1.0f, 0.0f, 0.0f, 0.0f };
+	vec4 c = { 1.0f, 1.0f, 1.0f, 0.0f };
+	vec4 check = { -2.0f, -2.0f, -2.0f, 0.0f };
+
+	vec4 result = c * (-dot3(a, b));
+	EXPECT_TRUE(approx_eq(check, result));
 }
 
 }