From 3d0d52438f36e9c49c5647f1abbf5f65915f603f Mon Sep 17 00:00:00 2001
From: PeaAshMeter <ivanyr44@gmail.com>
Date: Sun, 7 Dec 2025 20:27:48 +0300
Subject: [PATCH] add a shader for a cool pixel reveal effect

---
 assets/shaders/reveal.glsl        | 24 ++++++++++++++++++++++++
 lib/simple_ui/level/layout.lua    | 22 ++++++++++++++--------
 lib/simple_ui/level/skill_row.lua |  2 --
 3 files changed, 38 insertions(+), 10 deletions(-)
 create mode 100644 assets/shaders/reveal.glsl

diff --git a/assets/shaders/reveal.glsl b/assets/shaders/reveal.glsl
new file mode 100644
index 0000000..2af557e
--- /dev/null
+++ b/assets/shaders/reveal.glsl
@@ -0,0 +1,24 @@
+extern float t;
+extern float blockSize;
+
+// hash-функция для шума по целочисленным координатам блока
+float hash(vec2 p) {
+    p = vec2(
+        dot(p, vec2(127.1, 311.7)),
+        dot(p, vec2(269.5, 183.3))
+    );
+    return fract(sin(p.x + p.y) * 43758.5453123);
+}
+
+vec4 effect(vec4 color, Image tex, vec2 texCoord, vec2 screenCoord)
+{
+    float blockSize = 4.0;
+
+    vec2 cell = floor(screenCoord / blockSize);
+    float n = hash(cell); // [0..1]
+    float mask = 1.0 - step(t, n);
+
+    vec4 base = Texel(tex, texCoord) * color;
+    base.a *= mask;
+    return base;
+}
diff --git a/lib/simple_ui/level/layout.lua b/lib/simple_ui/level/layout.lua
index 2f2fe8a..0ace175 100644
--- a/lib/simple_ui/level/layout.lua
+++ b/lib/simple_ui/level/layout.lua
@@ -209,6 +209,16 @@ function characterPanel:update(dt)
         width = self.bars.bounds.width,
         height = self.bars.bounds.height + self.skillRow.bounds.height
     }
+
+    --- анимация появления
+    local alpha = 1
+    if self.state == "show" then
+        alpha = self.animationNode:getValue()
+    elseif self.state == "hide" then
+        alpha = 1 - self.animationNode:getValue()
+    end
+    local revealShader = Tree.assets.files.shaders.reveal
+    revealShader:send("t", alpha)
 end
 
 function characterPanel:draw()
@@ -219,17 +229,13 @@ function characterPanel:draw()
 
     self:drawBorder("outer")
 
-    local alpha = 1
-    if self.state == "show" then
-        alpha = self.animationNode:getValue()
-    elseif self.state == "hide" then
-        alpha = 1 - self.animationNode:getValue()
-    end
-
+    --- рисуем текстуру шейдером появления
     love.graphics.setCanvas()
-    love.graphics.setColor(1, 1, 1, alpha)
+    love.graphics.setShader(Tree.assets.files.shaders.reveal)
+    love.graphics.setColor(1, 1, 1, 1)
     love.graphics.draw(c)
     love.graphics.setColor(1, 1, 1)
+    love.graphics.setShader()
 end
 
 -----------------------------------
diff --git a/lib/simple_ui/level/skill_row.lua b/lib/simple_ui/level/skill_row.lua
index fc51b67..ebb01bd 100644
--- a/lib/simple_ui/level/skill_row.lua
+++ b/lib/simple_ui/level/skill_row.lua
@@ -1,6 +1,4 @@
 local icons = require("lib.utils.sprite_atlas").load(Tree.assets.files.dev_icons)
-local easing = require "lib.utils.easing"
-local AnimationNode = require "lib.animation_node"
 local Element = require "lib.simple_ui.element"
 local Rect = require "lib.simple_ui.rect"