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")
+}

orx-shader-phrases/src/main/kotlin/annotations/ShaderPhrase.kt

@@ -0,0 +1,15 @@
+package org.openrndr.extra.shaderphrases.annotations
+
+enum class ShaderPhraseLanguage {
+    GLSL
+}
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.FILE, AnnotationTarget.CLASS, AnnotationTarget.FIELD)
+annotation class ShaderPhrase(val exports: Array<String>,
+                              val imports: Array<String> = emptyArray(),
+                              val language: ShaderPhraseLanguage = ShaderPhraseLanguage.GLSL)
+
+
+@Target(AnnotationTarget.FILE)
+annotation class ShaderPhrases(val exports: Array<String>)

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

@@ -0,0 +1,24 @@
+@file:JvmName("Dummy")
+@file:ShaderPhrases(["dummy"])
+
+package org.openrndr.extra.shaderphrases.phrases
+import org.openrndr.extra.shaderphrases.annotations.ShaderPhrase
+import org.openrndr.extra.shaderphrases.annotations.ShaderPhrases
+
+@ShaderPhrase(["dummy"])
+const val phraseDummy = """
+float dummy() {
+    return 0.0;    
+}
+"""
+
+
+fun main() {
+    val c = Class.forName("org.openrndr.extra.shaderphrases.phrases.Dummy")
+
+    if (c.annotations.any { it.annotationClass == ShaderPhrases::class }) {
+        println(c.getDeclaredField("phraseDummy").get(null))
+
+
+    }
+}

orx-shader-phrases/src/test/kotlin/TestPreprocessShader.kt

@@ -0,0 +1,19 @@
+import org.openrndr.extra.shaderphrases.preprocessShader
+import org.spekframework.spek2.Spek
+import org.spekframework.spek2.style.specification.describe
+
+object TestPreprocessShader:Spek({
+
+    describe("A shader with import statements") {
+        val shader = """
+#version 330
+import org.openrndr.extra.shaderphrases.phrases.Dummy.*
+
+
+""".trimIndent()
+        describe("when preprocessed") {
+            val processed = preprocessShader(shader)
+            println(processed)
+        }
+    }
+})