feat(theme): Implement comprehensive CRT Filter (scanlines, vignette, noise)

src/gui_2.py

@@ -131,7 +131,8 @@ class App:
   self._token_stats: dict[str, Any] = {}
   self._token_stats_dirty: bool = True
   self.perf_history: dict[str, list] = {"frame_time": [0.0] * 100, "fps": [0.0] * 100}
-  self._nerv_scanlines = theme_fx.ScanlineOverlay()
+  self._nerv_crt = theme_fx.CRTFilter()
+  self.ui_crt_filter = True
   self._nerv_alert = theme_fx.AlertPulsing()
   self._nerv_flicker = theme_fx.StatusFlicker()
 
@@ -307,9 +308,8 @@ class App:
    ws = imgui.get_io().display_size
    self._nerv_alert.update(self.ai_status)
    self._nerv_alert.render(ws.x, ws.y)
-   self._nerv_scanlines.render(ws.x, ws.y)
-   
-  pushed_prior_tint = False
+   self._nerv_crt.enabled = self.ui_crt_filter
+   self._nerv_crt.render(ws.x, ws.y)
   if self.perf_profiling_enabled: self.perf_monitor.start_component("_gui_func")
   if self.is_viewing_prior_session:
    imgui.push_style_color(imgui.Col_.window_bg, vec4(50, 40, 20))
@@ -2895,17 +2895,21 @@ def hello():
    ch_ct, ctrans = imgui.slider_float("##ctrans", theme.get_child_transparency(), 0.1, 1.0, "%.2f")
    if ch_ct:
     theme.set_child_transparency(ctrans)
-    self._flush_to_config()
-    models.save_config(self.config)
-    
-   imgui.separator()
-   bg = bg_shader.get_bg()
    ch_bg, bg.enabled = imgui.checkbox("Animated Background Shader", bg.enabled)
    if ch_bg:
     gui_cfg = self.config.setdefault("gui", {})
     gui_cfg["bg_shader_enabled"] = bg.enabled
     self._flush_to_config()
     models.save_config(self.config)
+   
+   ch_crt, self.ui_crt_filter = imgui.checkbox("CRT Filter", self.ui_crt_filter)
+   if ch_crt:
+    gui_cfg = self.config.setdefault("gui", {})
+    gui_cfg["crt_filter_enabled"] = self.ui_crt_filter
+    self._flush_to_config()
+    models.save_config(self.config)
+    self._flush_to_config()
+    models.save_config(self.config)
   imgui.end()
   if self.perf_profiling_enabled: self.perf_monitor.end_component("_render_theme_panel")
 

src/theme_nerv_fx.py

@@ -1,8 +1,9 @@
 import time
 import math
+import random
 from imgui_bundle import imgui
 
-class ScanlineOverlay:
+class CRTFilter:
  def __init__(self):
   self.enabled = True
 
@@ -10,9 +11,28 @@ class ScanlineOverlay:
   if not self.enabled:
    return
   draw_list = imgui.get_foreground_draw_list()
-  color = imgui.get_color_u32((0.0, 0.0, 0.0, 0.06))
+  
+  # Scanlines
+  scanline_color = imgui.get_color_u32((0.0, 0.0, 0.0, 0.06))
   for y in range(0, int(height), 2):
-   draw_list.add_line((0.0, float(y)), (float(width), float(y)), color, 1.0)
+   draw_list.add_line((0.0, float(y)), (float(width), float(y)), scanline_color, 1.0)
+  
+  # Subtle Vignette
+  v_steps = 15
+  for i in range(v_steps):
+   alpha = (i / v_steps) ** 2.0 * 0.15
+   v_color = imgui.get_color_u32((0.0, 0.0, 0.0, alpha))
+   inset = (v_steps - i) * 6.0
+   if width > inset * 2.0 and height > inset * 2.0:
+    draw_list.add_rect((inset, inset), (width - inset, height - inset), v_color, 40.0, 0, 10.0)
+
+  # Subtle Random Noise
+  for _ in range(30):
+   nx = random.uniform(0.0, width)
+   ny = random.uniform(0.0, height)
+   n_alpha = random.uniform(0.01, 0.03)
+   n_color = imgui.get_color_u32((1.0, 1.0, 1.0, n_alpha))
+   draw_list.add_rect_filled((nx, ny), (nx + 1.0, ny + 1.0), n_color)
 
 class StatusFlicker:
  def get_alpha(self) -> float: