From: Eduardo <yo@edufdez.es>
Date: Wed, 31 Jan 2024 00:37:33 +0000 (+0100)
Subject: shader to simil small pixels blocks losing signal (random black squares)
X-Git-Url: http://git.edufdez.es/?a=commitdiff_plain;h=c3ce7689311edaabf282bd078c1cb4048515869f;p=ScaryGame.git

shader to simil small pixels blocks losing signal (random black squares)
---

diff --git a/levels/unicorn_level/Shaders.gd b/levels/unicorn_level/Shaders.gd
index 92fda5e..dfdd59f 100644
--- a/levels/unicorn_level/Shaders.gd
+++ b/levels/unicorn_level/Shaders.gd
@@ -1,5 +1,29 @@
 extends ColorRect
 
-# Called every frame. 'delta' is the elapsed time since the previous frame.
+const squareLenghtMax := 50
+var blackBlock := false
+
+
 func _process(_delta):
+	# edit noise level
 	material.set("shader_parameter/cell_amount", randf_range(100, 250))
+
+	# black squares from time to time
+	var current_time := Time.get_ticks_msec()
+	if (((current_time / 100) % 5 == 0) and (randf() < .1)): # put a square
+		blackBlock = true
+		material.set("shader_parameter/square_position", generate_square_points())
+	elif blackBlock: # remove the square
+		blackBlock = false
+		material.set("shader_parameter/square_position", Vector4())
+
+
+func generate_square_points() -> Vector4:
+	var res := get_viewport_rect().size
+
+	var x := randi_range(0, res.x)
+	var y := randi_range(x, x + squareLenghtMax)
+	var z := randi_range(0, res.y)
+	var w := randi_range(z, z + squareLenghtMax)
+
+	return Vector4(x, y, z, w)
diff --git a/levels/unicorn_level/unicorn_map.tscn b/levels/unicorn_level/unicorn_map.tscn
index 4ee00e2..b594292 100644
--- a/levels/unicorn_level/unicorn_map.tscn
+++ b/levels/unicorn_level/unicorn_map.tscn
@@ -36,6 +36,7 @@ shader_parameter/period = Vector2(100, 100)
 shader_parameter/r_displacement = Vector2(3, -1)
 shader_parameter/g_displacement = Vector2(0, 0)
 shader_parameter/b_displacement = Vector2(-3, 1)
+shader_parameter/square_position = Vector4(0, 0, 0, 0)
 
 [node name="Node3D" type="Node3D"]
 
diff --git a/shaders/screen_shaders.gdshader b/shaders/screen_shaders.gdshader
index 3d68d86..ebf2626 100644
--- a/shaders/screen_shaders.gdshader
+++ b/shaders/screen_shaders.gdshader
@@ -14,12 +14,15 @@ uniform vec2 r_displacement = vec2(3.0, 0.0);
 uniform vec2 g_displacement = vec2(0.0, 0.0);
 uniform vec2 b_displacement = vec2(-3.0, 0.0);
 
-vec2 modulo(vec2 divident, vec2 divisor){
+// Uniforms corruption squares
+uniform vec4 square_position = vec4(10., 200., 20., 50.); // x, y, z, w
+
+vec2 modulo(vec2 divident, vec2 divisor) {
 	vec2 positiveDivident = mod(divident, divisor) + divisor;
 	return mod(positiveDivident, divisor);
 }
 
-vec2 random(vec2 value){
+vec2 random(vec2 value) {
 	value = vec2( dot(value, vec2(127.1,311.7) ),
 				  dot(value, vec2(269.5,183.3) ) );
 	return -1.0 + 2.0 * fract(sin(value) * 43758.5453123);
@@ -50,6 +53,7 @@ float seamless_noise(vec2 uv, vec2 _period) {
 }
 
 void fragment() {
+
     // Generate random noise
     // float noise = (fract(sin(dot(UV, vec2(12.9898, 78.233))) * 43758.5453) - 0.5) * 2.0;
 	float noise = seamless_noise(UV, period);
@@ -58,5 +62,9 @@ void fragment() {
 	float g = clamp(texture(screen_texture, SCREEN_UV + vec2(SCREEN_PIXEL_SIZE*g_displacement), 0.0).g + noise * grain_amount * grain_size, 0.0, 1.0);
 	float b = clamp(texture(screen_texture, SCREEN_UV + vec2(SCREEN_PIXEL_SIZE*b_displacement), 0.0).b + noise * grain_amount * grain_size, 0.0, 1.0);
 
-	COLOR = vec4(r, g, b, 1.0);
+	if (FRAGCOORD.x > square_position.x && FRAGCOORD.x < square_position.y && FRAGCOORD.y > square_position.z && FRAGCOORD.y < square_position.w) {
+		COLOR = vec4(0, 0, 0, 1.0);
+	} else {
+		COLOR = vec4(r, g, b, 1.0);
+	}
 }
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