From 349dc274f43b49942d55080a7b853b902fffe29a Mon Sep 17 00:00:00 2001
From: Recep Aslantas <info@recp.me>
Date: Thu, 20 Feb 2020 15:19:20 +0300
Subject: [PATCH] add forward vector as macro (vec3, RH)

* this will be used for where Vec3.Forward is needed
---
 include/cglm/vec3.h  | 7 ++++---
 test/src/test_vec3.h | 8 ++++++++
 test/tests.h         | 2 ++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/cglm/vec3.h b/include/cglm/vec3.h
index 0340e96..7abeaf5 100644
--- a/include/cglm/vec3.h
+++ b/include/cglm/vec3.h
@@ -111,9 +111,10 @@
 #define GLM_VEC3_ONE  ((vec3)GLM_VEC3_ONE_INIT)
 #define GLM_VEC3_ZERO ((vec3)GLM_VEC3_ZERO_INIT)
 
-#define GLM_YUP  ((vec3){0.0f, 1.0f, 0.0f})
-#define GLM_ZUP  ((vec3){0.0f, 0.0f, 1.0f})
-#define GLM_XUP  ((vec3){1.0f, 0.0f, 0.0f})
+#define GLM_YUP       ((vec3){0.0f,  1.0f,  0.0f})
+#define GLM_ZUP       ((vec3){0.0f,  0.0f,  1.0f})
+#define GLM_XUP       ((vec3){1.0f,  0.0f,  0.0f})
+#define GLM_FORWARD   ((vec3){0.0f,  0.0f, -1.0f})
 
 #define GLM_XXX GLM_SHUFFLE3(0, 0, 0)
 #define GLM_YYY GLM_SHUFFLE3(1, 1, 1)
diff --git a/test/src/test_vec3.h b/test/src/test_vec3.h
index 4583950..0b6dc4d 100644
--- a/test/src/test_vec3.h
+++ b/test/src/test_vec3.h
@@ -74,6 +74,14 @@ TEST_IMPL(MACRO_GLM_XUP) {
   TEST_SUCCESS
 }
 
+TEST_IMPL(MACRO_GLM_FORWARD_RH) {
+  ASSERT(test_eq(GLM_FORWARD[0],  0.0f))
+  ASSERT(test_eq(GLM_FORWARD[1],  0.0f))
+  ASSERT(test_eq(GLM_FORWARD[2], -1.0f))
+  
+  TEST_SUCCESS
+}
+
 TEST_IMPL(MACRO_GLM_SHUFFLE3) {
   ASSERT(TEST_GLM_SHUFFLE3(1, 0, 0) == GLM_SHUFFLE3(1, 0, 0))
   ASSERT(TEST_GLM_SHUFFLE3(0, 1, 0) == GLM_SHUFFLE3(0, 1, 0))
diff --git a/test/tests.h b/test/tests.h
index b57fcd4..ec6da23 100644
--- a/test/tests.h
+++ b/test/tests.h
@@ -205,6 +205,7 @@ TEST_DECLARE(MACRO_GLM_VEC3_ZERO)
 TEST_DECLARE(MACRO_GLM_YUP)
 TEST_DECLARE(MACRO_GLM_ZUP)
 TEST_DECLARE(MACRO_GLM_XUP)
+TEST_DECLARE(MACRO_GLM_FORWARD_RH)
 TEST_DECLARE(MACRO_GLM_SHUFFLE3)
 TEST_DECLARE(MACRO_GLM_XXX)
 TEST_DECLARE(MACRO_GLM_YYY)
@@ -715,6 +716,7 @@ TEST_LIST {
   TEST_ENTRY(MACRO_GLM_YUP)
   TEST_ENTRY(MACRO_GLM_ZUP)
   TEST_ENTRY(MACRO_GLM_XUP)
+  TEST_ENTRY(MACRO_GLM_FORWARD_RH)
   TEST_ENTRY(MACRO_GLM_SHUFFLE3)
   TEST_ENTRY(MACRO_GLM_XXX)
   TEST_ENTRY(MACRO_GLM_YYY)