playing around with colour threshold filter

com/danitheskunk/skunkworks/Test3D.java

@@ -18,7 +18,7 @@ public class Test3D extends BaseGame {
 
 	public Test3D() {
 		super(new Vec2i(1920, 1080), "Skunkworks 3d test");
-		window.setRenderSize(new Vec2i(1920/8, 1080/8));
+		window.setRenderSize(new Vec2i(1920, 1080));
 		System.out.printf("assimp version: %d.%d.%d\n",
 			Assimp.aiGetVersionMajor(),
 			Assimp.aiGetVersionMinor(),
@@ -48,7 +48,7 @@ public class Test3D extends BaseGame {
 
 	@Override
 	protected void render3D(IRenderContext3D rc) {
-		rc.clear(Color.GRAY);
+		rc.clear(Color.BLACK);
 		rc.renderModel(model);
 	}
 

com/danitheskunk/skunkworks/backends/gl/FilterColorThreshold.java

@@ -0,0 +1,55 @@
+package com.danitheskunk.skunkworks.backends.gl;
+
+public class FilterColorThreshold extends Filter {
+	private static final String fragmentSource = """
+		#version 450
+		layout(location = 1) in vec2 texCoord;
+		layout(binding = 0) uniform sampler2D tex;
+		out vec4 color;
+		void main() {
+			vec4 col = texture(tex, texCoord);
+			/*
+			if(col.r > 0.5) 
+				col.r = 1.0;
+			else
+				col.r = 0.0;
+			if(col.g > 0.5) 
+				col.g = 1.0;
+			else
+				col.g = 0.0;
+			if(col.b > 0.5) 
+				col.b = 1.0;
+			else
+				col.b = 0.0;
+			*/
+			if(col.r > 0.5 && col.g < 0.5 && col.b < 0.5) {
+				col.r = 1.0;
+				col.g = 0.0;
+				col.b = 0.0;
+			} else if(col.r + col.g + col.b > 2.5) {
+				col.r = 1.0;
+				col.g = 1.0;
+				col.b = 1.0;
+			} else {
+				col.r = 0.0;
+				col.g = 0.0;
+				col.b = 0.0;
+			}
+			if(col.a > 0.0) {
+				color = col;
+			}
+		}
+		""";
+	private static final String vertexSource = """
+		#version 450
+		layout(location = 0) in vec2 pos;
+		layout(location = 1) out vec2 out_texCoord;
+		void main() {
+			gl_Position = vec4(pos, 0.0f, 1.0f);
+			out_texCoord = vec2(pos.x * 0.5 + 0.5, pos.y * 0.5 + 0.5);
+		}
+		""";
+	public FilterColorThreshold(Framebuffer input) {
+		super(input, new Program(vertexSource, fragmentSource), false);
+	}
+}

com/danitheskunk/skunkworks/backends/gl/Window.java

@@ -24,6 +24,7 @@ public class Window extends BaseWindow {
 	private final Pipeline2D pipeline2D;
 	private final Pipeline3D pipeline3D;
 	private final Map<String, Filter> scalers;
+	private final Filter filter;
 	private final TextureAtlas textureAtlas;
 	private final long window;
 	private boolean shouldClose;
@@ -66,10 +67,12 @@ public class Window extends BaseWindow {
 		pipeline2D = new Pipeline2D(framebuffer, textureAtlas);
 		pipeline3D = new Pipeline3D(framebuffer, textureAtlas);
 
+		filter = new FilterColorThreshold(framebuffer);
+		var out = filter.output;
 		scalers = new HashMap<>();
-		scalers.put("stretch", new ScalerStretch(framebuffer));
+		scalers.put("stretch", new ScalerStretch(out));
-		scalers.put("aspect", new ScalerAspect(framebuffer));
+		scalers.put("aspect", new ScalerAspect(out));
-		scalers.put("integer", new ScalerInteger(framebuffer));
+		scalers.put("integer", new ScalerInteger(out));
 		scaler = "aspect";
 
 		mouse = new Mouse(window, scalers.get(scaler));
@@ -145,6 +148,7 @@ public class Window extends BaseWindow {
 
 	@Override
 	public void runScaler() {
+		filter.apply();
 		scalers.get(scaler).apply();
 		scalers.get(scaler).getOutput().copyToScreen();
 	}