millores en els presets

source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp

@@ -416,4 +416,10 @@ auto SDL3GPUShader::createShaderSPIRV(SDL_GPUDevice* device,
     return shader;
 }
 
+void SDL3GPUShader::setPostFXParams(float vignette, float scanlines, float chroma) {
+    uniforms_.vignette_strength  = vignette;
+    uniforms_.scanline_strength  = scanlines;
+    uniforms_.chroma_strength    = chroma;
+}
+
 }  // namespace Rendering

source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp

@@ -41,6 +41,9 @@ class SDL3GPUShader : public ShaderBackend {
         // Sube píxeles ARGB8888 desde CPU; llamado antes de render()
         void uploadPixels(const Uint32* pixels, int width, int height) override;
 
+        // Actualiza los parámetros de intensidad de los efectos PostFX
+        void setPostFXParams(float vignette, float scanlines, float chroma) override;
+
     private:
         static auto createShaderMSL(SDL_GPUDevice* device,
             const char* msl_source,