new abs functions for vec2, ivec2, ivec3, ivec4

test/src/test_ivec4.h

@@ -212,3 +212,22 @@ TEST_IMPL(GLM_PREFIX, ivec4_clamp) {
 
   TEST_SUCCESS
 }
+
+TEST_IMPL(GLM_PREFIX, ivec4_abs) {
+  ivec4  v1 = {2, -3, 4, -5}, v2 = {-12, -31, -42, -50};
+  ivec4  v3, v4;
+
+  GLM(ivec4_abs)(v1, v3);
+  GLM(ivec4_abs)(v2, v4);
+
+  ASSERT(v3[0] == 2)
+  ASSERT(v3[1] == 3)
+  ASSERT(v3[2] == 4)
+  ASSERT(v3[3] == 5)
+  ASSERT(v4[0] == 12)
+  ASSERT(v4[1] == 31)
+  ASSERT(v4[2] == 42)
+  ASSERT(v4[3] == 50)
+
+  TEST_SUCCESS
+}