Added WIP shader-phrases, annotations and tooling for shader phrases

resolving is done using the JVM class loader

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

@@ -0,0 +1,33 @@
+package org.openrndr.extra.shaderphrases
+
+import org.openrndr.extra.shaderphrases.annotations.ShaderPhrases
+
+fun preprocessShader(shader: String): String {
+    val lines = shader.split("\n")
+    val processed = lines.map {
+        if (it.startsWith("import ")) {
+            val tokens = it.split(" ")
+            val full = tokens[1]
+            val fullTokens = full.split(".")
+            val fieldName = fullTokens.last().replace(";","")
+            val packageClassTokens = fullTokens.dropLast(1)
+            val packageClass = packageClassTokens.joinToString(".")
+
+            val c = Class.forName(packageClass)
+            if (c.annotations.any { it.annotationClass == ShaderPhrases::class }) {
+                if (fieldName == "*") {
+                    c.declaredFields.filter { println(it.type); it.type.name =="java.lang.String" }.map {
+                        it.get(null)
+                    }.joinToString("\n")
+                } else {
+                    c.getDeclaredField(fieldName).get(null)
+                }
+            } else {
+                throw IllegalArgumentException("class $packageClass has no ShaderPhrases annotation")
+            }
+        } else {
+            it
+        }
+    }
+    return processed.joinToString("\n")
+}