From 3fbf590d39ed9bcb1e2fbd63274bc440932c5ad9 Mon Sep 17 00:00:00 2001
From: Recep Aslantas <info@recp.me>
Date: Mon, 29 May 2017 20:52:38 +0300
Subject: [PATCH] func for make matrix identity

---
 include/call/cglmc-mat.h  |  4 ++++
 include/call/cglmc-mat3.h |  4 ++++
 include/cglm-mat.h        | 21 +++++++++++++++++++++
 include/cglm-mat3.h       | 21 +++++++++++++++++++++
 src/cglm-mat.c            |  6 ++++++
 src/cglm-mat3.c           |  6 ++++++
 6 files changed, 62 insertions(+)

diff --git a/include/call/cglmc-mat.h b/include/call/cglmc-mat.h
index 2877fdc..6ea81e4 100644
--- a/include/call/cglmc-mat.h
+++ b/include/call/cglmc-mat.h
@@ -25,6 +25,10 @@ CGLM_EXPORT
 void
 glmc_mat4_copy(mat4 mat, mat4 dest);
 
+CGLM_EXPORT
+void
+glmc_mat4_identity(mat4 mat);
+
 CGLM_EXPORT
 void
 glmc_mat4_pick3(mat4 mat, mat3 dest);
diff --git a/include/call/cglmc-mat3.h b/include/call/cglmc-mat3.h
index e6c6c21..ceebc7e 100644
--- a/include/call/cglmc-mat3.h
+++ b/include/call/cglmc-mat3.h
@@ -20,6 +20,10 @@ CGLM_EXPORT
 void
 glmc_mat3_copy(mat3 mat, mat3 dest);
 
+CGLM_EXPORT
+void
+glmc_mat3_identity(mat3 mat);
+
 CGLM_EXPORT
 void
 glmc_mat3_mul(mat3 m1, mat3 m2, mat3 dest);
diff --git a/include/cglm-mat.h b/include/cglm-mat.h
index 397037a..87644ef 100644
--- a/include/cglm-mat.h
+++ b/include/cglm-mat.h
@@ -74,6 +74,27 @@ glm_mat4_copy(mat4 mat, mat4 dest) {
 #endif
 }
 
+/*!
+ * @brief make given matrix identity. It is identical with below, 
+ *        but it is more easy to do that with this func especially for members
+ *        e.g. glm_mat4_identity(aStruct->aMatrix);
+ *
+ * @code
+ * glm_mat4_copy(GLM_MAT4_IDENTITY, mat); // C only
+ *
+ * // or
+ * mat4 mat = GLM_MAT4_IDENTITY_INIT;
+ * @endcode
+ *
+ * @param[in, out]  mat  destination
+ */
+CGLM_INLINE
+void
+glm_mat4_identity(mat4 mat) {
+  mat4 t = GLM_MAT4_IDENTITY_INIT;
+  glm_mat4_copy(t, mat);
+}
+
 /*!
  * @brief copy upper-left of mat4 to mat3
  *
diff --git a/include/cglm-mat3.h b/include/cglm-mat3.h
index e080693..cf8275a 100644
--- a/include/cglm-mat3.h
+++ b/include/cglm-mat3.h
@@ -38,6 +38,27 @@ glm_mat3_copy(mat3 mat, mat3 dest) {
   glm__memcpy(float, dest, mat, sizeof(mat3));
 }
 
+/*!
+ * @brief make given matrix identity. It is identical with below,
+ *        but it is more easy to do that with this func especially for members
+ *        e.g. glm_mat3_identity(aStruct->aMatrix);
+ *
+ * @code
+ * glm_mat3_copy(GLM_MAT3_IDENTITY, mat); // C only
+ *
+ * // or
+ * mat3 mat = GLM_MAT3_IDENTITY_INIT;
+ * @endcode
+ *
+ * @param[in, out]  mat  destination
+ */
+CGLM_INLINE
+void
+glm_mat3_identity(mat3 mat) {
+  mat3 t = GLM_MAT3_IDENTITY_INIT;
+  glm_mat3_copy(t, mat);
+}
+
 /*!
  * @brief multiply m1 and m2 to dest
  *
diff --git a/src/cglm-mat.c b/src/cglm-mat.c
index d2991a0..5677c81 100644
--- a/src/cglm-mat.c
+++ b/src/cglm-mat.c
@@ -19,6 +19,12 @@ glmc_mat4_copy(mat4 mat, mat4 dest) {
   glm_mat4_copy(mat, dest);
 }
 
+CGLM_EXPORT
+void
+glmc_mat4_identity(mat4 mat) {
+  glm_mat4_identity(mat);
+}
+
 CGLM_EXPORT
 void
 glmc_mat4_pick3(mat4 mat, mat3 dest) {
diff --git a/src/cglm-mat3.c b/src/cglm-mat3.c
index e8b4a70..cc94e7d 100644
--- a/src/cglm-mat3.c
+++ b/src/cglm-mat3.c
@@ -13,6 +13,12 @@ glmc_mat3_copy(mat3 mat, mat3 dest) {
   glm_mat3_copy(mat, dest);
 }
 
+CGLM_EXPORT
+void
+glmc_mat3_identity(mat3 mat) {
+  glm_mat3_identity(mat);
+}
+
 CGLM_EXPORT
 void
 glmc_mat3_mul(mat3 m1, mat3 m2, mat3 dest) {