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

resolving is done using the JVM class loader

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 
 plugins {
     // plugin dependencies, load without applying them
-    id 'nebula.kotlin' version '1.3.41' apply false
+    id 'nebula.kotlin' version '1.3.50' apply false
     id 'com.jfrog.artifactory' version '4.6.2' apply false
 
     id 'nebula.contacts' version '4.1.1' apply false
@@ -38,7 +38,7 @@ plugins {
 
 project.ext {
     openrndrVersion = "0.3.35"
-    kotlinVersion = "1.3.41"
+    kotlinVersion = "1.3.50"
     spekVersion = "2.0.6"
 }
 
@@ -65,16 +65,14 @@ allprojects {
 
     repositories {
         mavenCentral()
+        jcenter()
         maven {
             url = "https://dl.bintray.com/openrndr/openrndr"
         }
 
-
         maven {
             url "https://dl.bintray.com/spekframework/spek"
         }
-
-
     }
 
     dependencies {
@@ -82,11 +80,12 @@ allprojects {
         compile "org.openrndr:openrndr-filter:$openrndrVersion"
         compile "org.openrndr:openrndr-shape:$openrndrVersion"
         compile group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: '1.3.0-RC2'
-
         testImplementation "org.spekframework.spek2:spek-dsl-jvm:$spekVersion"
+        testImplementation "org.amshove.kluent:kluent:1.53"
         testImplementation "org.jetbrains.kotlin:kotlin-test:$kotlinVersion"
         testRuntimeOnly "org.spekframework.spek2:spek-runner-junit5:$spekVersion"
         testRuntimeOnly "org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion"
+        runtime "org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion"
     }
 
     contacts {

orx-noise/build.gradle

@@ -0,0 +1,3 @@
+dependencies {
+    implementation project(":orx-shader-phrases")
+}

orx-noise/src/main/kotlin/phrases/NoisePhrases.kt

@@ -0,0 +1,32 @@
+@file:ShaderPhrases(exports = ["hash22","hash21","valueNoise21"])
+package org.openrndr.extra.noise.phrases
+
+import org.openrndr.extra.shaderphrases.annotations.ShaderPhrase
+import org.openrndr.extra.shaderphrases.annotations.ShaderPhrases
+
+@ShaderPhrase(exports = ["hash22"])
+val phraseHash22 = """vec2 hash22(vec2 p) {
+    float n = sin(dot(p, vec2(41, 289)));
+    return fract(vec2(262144, 32768)*n);
+}    
+"""
+
+@ShaderPhrase(exports = ["hash21"])
+val phraseHash21 = "float hash21(vec2 p) { return fract(1e4 * sin(17.0 * p.x + p.y * 0.1) * (0.1 + abs(sin(p.y * 13.0 + p.x)))); }"
+
+@ShaderPhrase(exports = ["valueNoise21"], imports = ["hash21"])
+val phraseValueNoise21 = """
+    
+float noise(vec2 x) {
+    vec2 i = floor(x);
+    vec2 f = fract(x);
+
+    float a = hash21(i);
+    float b = hash21(i + vec2(1.0, 0.0));
+    float c = hash21(i + vec2(0.0, 1.0));
+    float d = hash21(i + vec2(1.0, 1.0));
+
+    vec2 u = f * f * (3.0 - 2.0 * f);
+    return mix(a, b, u.x) + (c - a) * u.y * (1.0 - u.x) + (d - b) * u.x * u.y;
+}   
+""".trimIndent()

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)
+        }
+    }
+})

settings.gradle

@@ -14,4 +14,6 @@ include 'orx-camera',
         'orx-no-clear',
         'orx-noise',
         'orx-obj-loader',
-        'orx-olive'
+        'orx-olive',
+        'orx-shader-phrases',
+        'orx-shader-phrases-processor'