Dithering

assets/shaders/postprocess.glsl

@@ -15,13 +15,25 @@ uniform vec4 colDiffuse;
 
 out vec4 finalColor;
 
+const int bayer16[16] = int[16](0,  8,  2,  10, 
+                                12, 4,  14, 6, 
+                                3,  11, 1,  9, 
+                                15, 7,  13, 5);
+
+
 void main() {
     vec4 texelColor = texture(texture0, fragTexCoord);
     float grey = 0.21 * texelColor.r + 0.71 * texelColor.g + 0.07 * texelColor.b ;
+    int col = int(mod(gl_FragCoord.x, 4));
+    int row = int(mod(gl_FragCoord.y, 4));
+    float threshold = float(bayer16[col + 4 * row]) / 16.0 - 0.5;
+    grey = clamp(grey + threshold * 0.04 + 0.15 , 0.01, 0.99);
+
     vec2 paluv = vec2(grey, 0.5);
     vec4 paletteValue = texture(texture1, paluv);
-
     finalColor.a = 1.0;
+    // finalColor.rgb = vec3(floor(grey * POSTERIZE) / POSTERIZE );
+
     // finalColor.rgb = floor(texelColor.rgb * POSTERIZE) / POSTERIZE;
 
     finalColor.rgb = paletteValue.rgb;

house/main.odin

@@ -51,10 +51,11 @@ main :: proc() {
 
 
 	w, h := rl.GetScreenWidth(), rl.GetScreenHeight()
-	pixelize: i32 = 2
+	pixelize: i32 = 3
 	target := rl.LoadRenderTexture(w / pixelize, h / pixelize)
+	posttarget := rl.LoadRenderTexture(w / pixelize, h / pixelize)
 
-	palette := rl.LoadTexture("assets/gfx/blood-crow-1x.png")
+	palette := rl.LoadTexture("assets/gfx/bluem0ld-1x.png")
 	rl.SetTextureFilter(palette, .POINT)
 
 
@@ -145,6 +146,8 @@ main :: proc() {
 			w, h = rl.GetScreenWidth(), rl.GetScreenHeight()
 			rl.UnloadRenderTexture(target)
 			target = rl.LoadRenderTexture(w / pixelize, h / pixelize)
+			rl.UnloadRenderTexture(posttarget)
+			posttarget = rl.LoadRenderTexture(w / pixelize, h / pixelize)
 		}
 		rl.UpdateCamera(&cam, .FIRST_PERSON)
 		delta := rl.GetFrameTime()
@@ -197,27 +200,34 @@ main :: proc() {
 		rl.EndShaderMode()
 		rl.EndMode3D()
 		rl.EndTextureMode()
-		rl.BeginDrawing()
+		// rl.BeginDrawing()
+		rl.BeginTextureMode(posttarget)
 		rl.BeginShaderMode(posterizer)
 		rl.SetShaderValueTexture(posterizer, poster_palette, palette)
-		rl.DrawTexturePro(
-			target.texture,
-			rl.Rectangle{0, f32(h / pixelize), f32(w / pixelize), -f32(h / pixelize)},
-			{0, 0, f32(w), f32(h)},
-			{},
-			0,
-			rl.WHITE,
-		)
 		// rl.DrawTexturePro(
-		// 	target.depth,
+		// 	target.texture,
 		// 	rl.Rectangle{0, f32(h / pixelize), f32(w / pixelize), -f32(h / pixelize)},
 		// 	{0, 0, f32(w), f32(h)},
 		// 	{},
 		// 	0,
 		// 	rl.WHITE,
 		// )
+		rl.DrawTexture(target.texture, 0, 0, rl.WHITE)
 		rl.EndShaderMode()
-		// rl.DrawTexture(palette, 0, 0, rl.WHITE)
+		rl.EndTextureMode()
+
+		rl.BeginDrawing()
+		// rl.BeginTextureMode(posttarget)
+		// rl.BeginShaderMode(posterizer)
+		// rl.SetShaderValueTexture(posterizer, poster_palette, palette)
+		rl.DrawTexturePro(
+			posttarget.texture,
+			rl.Rectangle{0, 0, f32(w / pixelize), f32(h / pixelize)},
+			{0, 0, f32(w), f32(h)},
+			{},
+			0,
+			rl.WHITE,
+		)
 		rl.EndDrawing()
 	}
 }