BLI: Implement templated math functions for basic types

This is meant to complement the `blender::math` functions recently
added by D13791. It's sometimes desired to template an operation to work
on vector types, but also basic types like `float` and `int`. This patch
adds that ability with a new `BLI_math_base.hh` header.

The existing vector math header is changed to use the `vec_base` type
more explicitly, to allow the compiler's generic function overload resolution
to determine which implementation of each math function to use.
This is a relatively large change, but it also makes the file significantly
easier to understand by reducing the use of macros.

Differential Revision: https://developer.blender.org/D14113

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/blenlib/tests/BLI_math_base_test.cc b/source/blender/blenlib/tests/BLI_math_base_test.cc
index 33acefeeac2..62f2b2775d0 100644
--- a/source/blender/blenlib/tests/BLI_math_base_test.cc
+++ b/source/blender/blenlib/tests/BLI_math_base_test.cc
@@ -3,6 +3,10 @@
 #include "testing/testing.h"
 
 #include "BLI_math.h"
+#include "BLI_math_base.hh"
+#include "BLI_math_vector.hh"
+
+namespace blender::tests {
 
 /* In tests below, when we are using -1.0f as max_diff value, we actually turn the function into a
  * pure-ULP one. */
@@ -131,3 +135,20 @@ TEST(math_base, FloorPowerOf10)
   EXPECT_NEAR(floor_power_of_10(100.1f), 100.0f, 1e-4f);
   EXPECT_NEAR(floor_power_of_10(99.9f), 10.0f, 1e-4f);
 }
+
+TEST(math_base, MinVectorAndFloat)
+{
+  EXPECT_EQ(math::min(1.0f, 2.0f), 1.0f);
+}
+
+TEST(math_base, ClampInt)
+{
+  EXPECT_EQ(math::clamp(111, -50, 101), 101);
+}
+
+TEST(math_base, Midpoint)
+{
+  EXPECT_NEAR(math::midpoint(100.0f, 200.0f), 150.0f, 1e-4f);
+}
+
+}  // namespace blender::tests