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Add Vec3 negate and Vec3 normalize functions

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This commit is contained in:
Stephen Seo 2024-05-10 13:24:11 +09:00
parent ed622216f9
commit a65f49049e
3 changed files with 75 additions and 0 deletions
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8
src/sc_sacd.cpp
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@ -684,6 +684,14 @@ SC_SACD_Vec3 SC_SACD_Vec3_Div(SC_SACD_Vec3 vec, float scalar) {
return vec / scalar;
}
SC_SACD_Vec3 SC_SACD_Vec3_Negate(SC_SACD_Vec3 vec) {
return SC_SACD_Vec3{-vec.x, -vec.y, -vec.z};
}
SC_SACD_Vec3 SC_SACD_Vec3_Normalize(SC_SACD_Vec3 vec) {
return vec / SC_SACD_Vec3_Length(vec);
}
SC_SACD_Vec3 SC_SACD_Vec3_Project(SC_SACD_Vec3 vec, SC_SACD_Vec3 target) {
float upper_dot_product = SC_SACD_Dot_Product(vec, target);
float lower_dot_product = SC_SACD_Dot_Product(target, target);

5
src/sc_sacd.h
View file

@ -142,6 +142,11 @@ SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Difference(SC_SACD_Vec3 a,
SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Mult(SC_SACD_Vec3 vec, float scalar);
SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Div(SC_SACD_Vec3 vec, float scalar);
SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Negate(SC_SACD_Vec3 vec);
/// Turns vec into a unit vector and returns the unit vector.
SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Normalize(SC_SACD_Vec3 vec);
/// Projects "vec" onto "target".
SC_SACD_EXPORT SC_SACD_Vec3 SC_SACD_Vec3_Project(SC_SACD_Vec3 vec,
SC_SACD_Vec3 target);

62
src/test.cpp
View file

@ -840,6 +840,68 @@ int main() {
CHECK_FLOAT(result.z, 3.0F);
}
// Test negate.
{
SC_SACD_Vec3 vec{1.0F, 2.0F, 3.0F};
vec = SC_SACD_Vec3_Negate(vec);
CHECK_FLOAT(vec.x, -1.0F);
CHECK_FLOAT(vec.y, -2.0F);
CHECK_FLOAT(vec.z, -3.0F);
}
// Test normalize.
{
SC_SACD_Vec3 vec{1.0F, 0.0F, 0.0F};
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, 1.0F);
CHECK_FLOAT(vec.y, 0.0F);
CHECK_FLOAT(vec.z, 0.0F);
vec.x = 0.0F;
vec.y = -1.0F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, 0.0F);
CHECK_FLOAT(vec.y, -1.0F);
CHECK_FLOAT(vec.z, 0.0F);
vec.y = 0.0F;
vec.z = 0.7F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, 0.0F);
CHECK_FLOAT(vec.y, 0.0F);
CHECK_FLOAT(vec.z, 1.0F);
vec.x = 1.0F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, std::sqrt(0.5F));
CHECK_FLOAT(vec.y, 0.0F);
CHECK_FLOAT(vec.z, std::sqrt(0.5F));
vec.x = 1.0F;
vec.y = 1.0F;
vec.z = 1.0F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, std::sqrt(1.0F / 3.0F));
CHECK_FLOAT(vec.y, std::sqrt(1.0F / 3.0F));
CHECK_FLOAT(vec.z, std::sqrt(1.0F / 3.0F));
vec.x = 1.0F;
vec.y = -1.0F;
vec.z = -1.0F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, std::sqrt(1.0F / 3.0F));
CHECK_FLOAT(vec.y, -std::sqrt(1.0F / 3.0F));
CHECK_FLOAT(vec.z, -std::sqrt(1.0F / 3.0F));
vec.x = 1.0F;
vec.y = 2.0F;
vec.z = 3.0F;
vec = SC_SACD_Vec3_Normalize(vec);
CHECK_FLOAT(vec.x, std::sqrt(1.0F / 14.0F));
CHECK_FLOAT(vec.y, std::sqrt(4.0F / 14.0F));
CHECK_FLOAT(vec.z, std::sqrt(9.0F / 14.0F));
}
std::cout << "Checks checked: " << checks_checked << '\n'
<< "Checks passed: " << checks_passed << '\n';