Add GData.POSITION

also added a way to declare GData dependencies

Author: vanruesc

src/enums/GData.ts

@@ -25,6 +25,12 @@ export enum GData {
 
 	NORMAL = "normal",
 
+	/**
+	 * The view-space position.
+	 */
+
+	POSITION = "position",
+
 	/**
 	 * Occlusion, roughness and metalness.
 	 */

src/utils/EffectShaderData.ts

@@ -252,6 +252,12 @@ export class EffectShaderData implements ShaderData {
 
 				if(regExpGData.test(fragmentShader)) {
 
+					for(const dependency of this.gBufferConfig.gDataDependencies.get(value) ?? []) {
+
+						this.gData.add(dependency);
+
+					}
+
 					this.gData.add(value);
 
 				}
@@ -350,10 +356,13 @@ export class EffectShaderData implements ShaderData {
 
 	createGDataStructInitialization(): string {
 
+		const gDataDependencies = this.gBufferConfig.gDataDependencies;
+
 		return [
 			"\tGData gData;",
 			...Array.from(this.gBufferConfig.gDataStructInitialization)
 				.filter(x => this.gData.has(x[0]))
+				.sort((a, b) => gDataDependencies.has(a[0]) && gDataDependencies.get(a[0])!.has(b[0]) ? 1 : -1)
 				.map(x => `\t${x[1]}`)
 		].join("\n");
 

src/utils/GBufferConfig.ts

@@ -51,6 +51,12 @@ export class GBufferConfig extends EventDispatcher<BaseEventMap> {
 
 	readonly gDataStructInitialization: Map<GData | string, string>;
 
+	/**
+	 * A collection that describes {@link GData} cross-dependencies.
+	 */
+
+	readonly gDataDependencies: Map<GData | string, Set<GData | string>>;
+
 	/**
 	 * Constructs new a new G-Buffer config.
 	 */
@@ -81,6 +87,7 @@ export class GBufferConfig extends EventDispatcher<BaseEventMap> {
 			[GData.COLOR, "vec4 color;"],
 			[GData.DEPTH, "float depth;"],
 			[GData.NORMAL, "vec3 normal;"],
+			[GData.POSITION, "vec3 position;"],
 			[GData.ORM, "vec3 orm;"],
 			[GData.EMISSION, "vec3 emission;"],
 			[GData.LUMINANCE, "float luminance;"]
@@ -90,11 +97,16 @@ export class GBufferConfig extends EventDispatcher<BaseEventMap> {
 			[GData.COLOR, "gData.color = texture(gBuffer.color, UV);"],
 			[GData.DEPTH, "gData.depth = texture(gBuffer.depth, UV).r;"],
 			[GData.NORMAL, "gData.normal = texture(gBuffer.normal, UV).xyz;"],
+			[GData.POSITION, "gData.position = getViewPosition(UV, gData.depth);"],
 			[GData.ORM, "gData.orm = texture(gBuffer.orm, UV).xyz;"],
 			[GData.EMISSION, "gData.emission = texture(gBuffer.emission, UV).rgb;"],
 			[GData.LUMINANCE, "gData.luminance = luminance(gData.color.rgb);"]
 		]);
 
+		const gDataDependencies = new ObservableMap<GData | string, Set<GData | string>>([
+			[GData.POSITION, new Set<GData>([GData.DEPTH])]
+		]);
+
 		const listener = () => this.dispatchEvent({ type: GBufferConfig.EVENT_CHANGE });
 		textureConfigs.addEventListener(ObservableMap.EVENT_CHANGE, listener);
 		gBufferStructFields.addEventListener(ObservableMap.EVENT_CHANGE, listener);
@@ -107,6 +119,7 @@ export class GBufferConfig extends EventDispatcher<BaseEventMap> {
 		this.gBufferStructDeclaration = gBufferStructDeclaration;
 		this.gDataStructDeclaration = gDataStructDeclaration;
 		this.gDataStructInitialization = gDataStructInitialization;
+		this.gDataDependencies = gDataDependencies;
 
 	}