postfx: scanlines analítiques amb smoothstep a l'estil crtpi, exposant forma per preset YAML

source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp

@@ -204,6 +204,12 @@ namespace Rendering {
             const SDL_GPUViewport VP = computeViewport(scaling_mode_, sw, sh, game_width_, game_height_);
             SDL_SetGPUViewport(pass, &VP);
 
+            // pixel_scale = píxels físics per fila lògica al viewport. El shader l'usa
+            // per ajustar l'ample del smoothstep de scanlines a 1 píxel físic (estil crtpi).
+            uniforms_.pixel_scale = (game_height_ > 0)
+                ? VP.h / static_cast<float>(game_height_)
+                : 1.0F;
+
             SDL_BindGPUGraphicsPipeline(pass, pipeline_);
 
             SDL_GPUTextureSamplerBinding binding{};
@@ -234,6 +240,9 @@ namespace Rendering {
         uniforms_.curvature = params.curvature;
         uniforms_.bleeding = params.bleeding;
         uniforms_.flicker = params.flicker;
+        uniforms_.scan_dark_ratio = params.scan_dark_ratio;
+        uniforms_.scan_dark_floor = params.scan_dark_floor;
+        uniforms_.scan_edge_soft = params.scan_edge_soft;
     }
 
     void SDL3GPUShader::setVSync(bool vsync) {