add initial glslUtil files

glslUtil/glslUtil.c

@@ -0,0 +1,33 @@
+
+#include "glslUtil.h"
+
+void matrixLoadIdentity(mat4x4 *m)
+{
+    for (int i = 0; i < 4; i++)
+    {
+        for (int j = 0; j < 4; j++)
+        {
+            m[i][j] = (i == j) ? 1.0 : 0.0;
+        }
+    }
+}
+
+void matrixMult(mat4x4 *m, mat4x4 *a, mat4x4 *b)
+{
+    for (int i = 0; i < 4; i++)
+    {
+        for (int j = 0; j < 4; j++)
+        {
+            float v = 0.0;
+            for (int p = 0; p < 4; p++)
+            {
+                v += a[i][p] * b[p][j];
+            }
+            m[i][j] = v;
+        }
+    }
+}
+
+void matrixTranslate(mat4x4 *m, float x, float y, float z)
+{
+}

glslUtil/glslUtil.h

@@ -0,0 +1,12 @@
+
+#ifndef MATRIXLIB_H
+#define MATRIXLIB_H
+
+typedef float mat4x4[4][4];
+
+void matrixLoadIdentity(mat4x4 *m);
+void matrixMult(mat4x4 *m, mat4x4 *a, mat4x4 *b);
+void matrixTranslate(mat4x4 *m, float x, float y, float z);
+
+#endif
+