Unary minus vectors (#130)

* Unary Minus operator for vec2, vec3, and vec4

* Update README.md

Co-authored-by: zak <zak@DESKTOP-V1AQ0IT>

README.md

@@ -10,6 +10,9 @@ To get started, go download [the latest release](https://github.com/HandmadeMath
 
 Version         | Changes        |
 ----------------|----------------|
+**1.12.0** | Added Unary Minus operator for `HMM_Vec2`, `HMM_Vec3`, and `HMM_Vec4`. |
+**1.11.1** | Added HMM_PREFIX macro to a few functions that were missing it. |
+**1.11.0** | Added ability to customize or remove the default `HMM_` prefix on function names by defining a macro called `HMM_PREFIX(name)`. |
 **1.10.1** | Removed stdint.h, this doesn't exist on some really old compilers and we didn't really use it anyways. |
 **1.10.0** | Made HMM_Perspective use vertical FOV instead of horizontal FOV for consistency with other graphics APIs. |
 **1.9.0** | Added SSE versions of quaternion operations. |

test/HandmadeMathDifferentPrefix.cpp

@@ -0,0 +1,12 @@
+#define HMM_PREFIX(name) WOW_##name
+
+#define HANDMADE_MATH_IMPLEMENTATION
+#define HANDMADE_MATH_NO_INLINE
+#include "../HandmadeMath.h"
+
+int main() {
+    hmm_vec4 a = WOW_Vec4(1, 2, 3, 4);
+    hmm_vec4 b = WOW_Vec4(5, 6, 7, 8);
+
+    WOW_Add(a, b);
+}

test/Makefile

@@ -1,8 +1,8 @@
 BUILD_DIR=./build
 
-CXXFLAGS+=-g -Wall -Wextra -pthread -Wno-missing-braces -Wno-missing-field-initializers
+CXXFLAGS+=-g -Wall -Wextra -pthread -Wno-missing-braces -Wno-missing-field-initializers -Wfloat-equal
 
-all: c c_no_sse cpp cpp_no_sse build_c_without_coverage build_cpp_without_coverage
+all: c c_no_sse cpp cpp_no_sse build_c_without_coverage build_cpp_without_coverage build_cpp_different_prefix
 
 build_all: build_c build_c_no_sse build_cpp build_cpp_no_sse
 
@@ -58,7 +58,7 @@ build_cpp_no_sse: HandmadeMath.cpp test_impl
 
 test_impl: hmm_test.cpp hmm_test.c
 
-build_c_without_coverage: HandmadeMath.c
+build_c_without_coverage: HandmadeMath.c test_impl
 	@echo "\nCompiling in C mode"
 	mkdir -p $(BUILD_DIR)
 	cd $(BUILD_DIR)\
@@ -75,3 +75,11 @@ build_cpp_without_coverage: HandmadeMath.cpp test_impl
 		&& $(CXX) $(CPPFLAGS) $(CXXFLAGS) -ohmm_test_cpp_no_sse \
 			-DHANDMADE_MATH_CPP_MODE -DWITHOUT_COVERAGE \
 			../HandmadeMath.cpp ../hmm_test.cpp
+
+build_cpp_different_prefix: HandmadeMath.cpp
+	@echo "\nCompiling C++ with different prefix"
+	mkdir -p $(BUILD_DIR)
+	cd $(BUILD_DIR) \
+		&& $(CXX) $(CPPFLAGS) $(CXXFLAGS) -ohmm_test_cpp_different_prefix \
+			-DHANDMADE_MATH_CPP_MODE -DDIFFERENT_PREFIX \
+			../HandmadeMathDifferentPrefix.cpp

test/categories/ScalarMath.h

@@ -74,9 +74,9 @@ TEST(ScalarMath, Power)
 
 TEST(ScalarMath, PowerF)
 {
-    EXPECT_FLOAT_EQ(HMM_PowerF(2.0f, 0), 1.0f);
+    EXPECT_FLOAT_EQ(HMM_PowerF(2.0f, 0.0f), 1.0f);
-    EXPECT_NEAR(HMM_PowerF(2.0f, 4.1), 17.148376f, 0.0001f);
+    EXPECT_NEAR(HMM_PowerF(2.0f, 4.1f), 17.148376f, 0.0001f);
-    EXPECT_NEAR(HMM_PowerF(2.0f, -2.5), 0.176777f, 0.0001f);
+    EXPECT_NEAR(HMM_PowerF(2.0f, -2.5f), 0.176777f, 0.0001f);
 }
 
 TEST(ScalarMath, Lerp)

test/categories/Subtraction.h

@@ -199,3 +199,32 @@ TEST(Subtraction, Quaternion)
     EXPECT_FLOAT_EQ(q1.W, -4.0f);
 #endif
 }
+
+#ifdef __cplusplus
+TEST(UnaryMinus, Vec2)
+{
+    hmm_vec2 VectorOne = {1.0f, 2.0f};
+    hmm_vec2 Result = -VectorOne;
+    EXPECT_FLOAT_EQ(Result.X, -1.0f);
+    EXPECT_FLOAT_EQ(Result.Y, -2.0f);
+}
+
+TEST(UnaryMinus, Vec3)
+{
+    hmm_vec3 VectorOne = {1.0f, 2.0f, 3.0f};
+    hmm_vec3 Result = -VectorOne;
+    EXPECT_FLOAT_EQ(Result.X, -1.0f);
+    EXPECT_FLOAT_EQ(Result.Y, -2.0f);
+    EXPECT_FLOAT_EQ(Result.Z, -3.0f);
+}
+
+TEST(UnaryMinus, Vec4)
+{
+    hmm_vec4 VectorOne = {1.0f, 2.0f, 3.0f, 4.0f};
+    hmm_vec4 Result = -VectorOne;
+    EXPECT_FLOAT_EQ(Result.X, -1.0f);
+    EXPECT_FLOAT_EQ(Result.Y, -2.0f);
+    EXPECT_FLOAT_EQ(Result.Z, -3.0f);
+    EXPECT_FLOAT_EQ(Result.W, -4.0f);
+}
+#endif