[orx-shader-phrases] mat2 is valid GLSL but was missing (#271)

orx-shader-phrases/src/commonMain/kotlin/ShaderPreprocessor.kt

@@ -61,7 +61,7 @@ object ShaderPhraseRegistry {
      */
     fun getGLSLFunctionName(glsl: String): String {
         val functionRex =
-            Regex("""\s*(float|int|[bi]?vec[234]|mat[34])\s+(\w+)\s*\(.*\).*""")
+            Regex("""\s*(float|int|[bi]?vec[234]|mat[234])\s+(\w+)\s*\(.*\).*""")
         val defs = glsl.split("\n").filter {
             functionRex.matches(it)
         }.take(1).mapNotNull {

orx-shader-phrases/src/jvmTest/kotlin/TestFunctionNameRx.kt

@@ -17,6 +17,7 @@ object TestFunctionNameRx : Spek({
             "vec4 ggg() {" to "ggg",
             "vec3 hhh() {" to "hhh",
             "vec2 iii() {" to "iii",
+            "mat2 ii2() {" to "ii2",
             "mat3 jjj() {" to "jjj",
             "mat4 kkk() {" to "kkk",
             "float lll() {" to "lll",