From 7f26b8dbd04756068d6236f78511b72d2f62811d Mon Sep 17 00:00:00 2001
From: Sergio Valor <jaildesigner@gmail.com>
Date: Thu, 16 Apr 2026 13:40:21 +0200
Subject: [PATCH] opcions per defecte d'emscripten

---
 source/core/rendering/screen.cpp | 30 ++++++++++++++++++++++++++++--
 source/core/rendering/screen.hpp |  1 +
 source/main.cpp                  |  9 +++++++++
 3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/source/core/rendering/screen.cpp b/source/core/rendering/screen.cpp
index 6701387..5e12249 100644
--- a/source/core/rendering/screen.cpp
+++ b/source/core/rendering/screen.cpp
@@ -42,10 +42,9 @@ Screen::Screen() {
 
     window_ = SDL_CreateWindow(Locale::get("window.title"), w, h, fullscreen_ ? SDL_WINDOW_FULLSCREEN : 0);
     renderer_ = SDL_CreateRenderer(window_, nullptr);
-    SDL_SetRenderLogicalPresentation(renderer_, GAME_WIDTH, GAME_HEIGHT, SDL_LOGICAL_PRESENTATION_LETTERBOX);
 
     texture_ = SDL_CreateTexture(renderer_, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STREAMING, GAME_WIDTH, GAME_HEIGHT);
-    SDL_SetTextureScaleMode(texture_, SDL_SCALEMODE_NEAREST);
+    applyFallbackPresentation();
 
     // Inicialitza backend GPU si l'acceleració està activada
     initShaders();
@@ -204,6 +203,8 @@ void Screen::toggleAspectRatio() {
     Options::video.aspect_ratio_4_3 = !Options::video.aspect_ratio_4_3;
     if (shader_backend_) {
         shader_backend_->setStretch4_3(Options::video.aspect_ratio_4_3);
+    } else {
+        applyFallbackPresentation();
     }
     if (!fullscreen_) {
         adjustWindowSize();
@@ -214,6 +215,8 @@ void Screen::toggleIntegerScale() {
     Options::video.integer_scale = !Options::video.integer_scale;
     if (shader_backend_) {
         shader_backend_->setScaleMode(Options::video.integer_scale);
+    } else {
+        applyFallbackPresentation();
     }
 }
 
@@ -228,6 +231,8 @@ void Screen::toggleStretchFilter() {
     Options::video.stretch_filter_linear = !Options::video.stretch_filter_linear;
     if (shader_backend_) {
         shader_backend_->setStretchFilter(Options::video.stretch_filter_linear);
+    } else {
+        applyFallbackPresentation();
     }
 }
 
@@ -383,6 +388,27 @@ void Screen::updateRenderInfo() {
         0b1001);
 }
 
+void Screen::applyFallbackPresentation() {
+    // Fallback SDL_Renderer (p.ex. emscripten/WebGL2 sense shaders GPU): tria
+    // el mode de presentació lògica segons 4:3 i integer_scale, i aplica el
+    // filtre de la textura segons stretch_filter_linear. Sense açò, el path
+    // fallback mostrava sempre LETTERBOX i ignorava les tres flags.
+    SDL_ScaleMode scale = Options::video.stretch_filter_linear ? SDL_SCALEMODE_LINEAR : SDL_SCALEMODE_NEAREST;
+    if (texture_) SDL_SetTextureScaleMode(texture_, scale);
+
+    SDL_RendererLogicalPresentation mode;
+    if (Options::video.aspect_ratio_4_3) {
+        // La finestra ja té aspect 4:3 (alçada × 1.2); STRETCH estira la
+        // textura 320×200 fins a omplir-la exactament.
+        mode = SDL_LOGICAL_PRESENTATION_STRETCH;
+    } else if (Options::video.integer_scale) {
+        mode = SDL_LOGICAL_PRESENTATION_INTEGER_SCALE;
+    } else {
+        mode = SDL_LOGICAL_PRESENTATION_LETTERBOX;
+    }
+    SDL_SetRenderLogicalPresentation(renderer_, GAME_WIDTH, GAME_HEIGHT, mode);
+}
+
 void Screen::adjustWindowSize() {
     int w = GAME_WIDTH * zoom_;
     // Si 4:3 actiu, l'alçada visual és 240 per zoom (200 * 1.2)
diff --git a/source/core/rendering/screen.hpp b/source/core/rendering/screen.hpp
index 9c3a404..400ce4f 100644
--- a/source/core/rendering/screen.hpp
+++ b/source/core/rendering/screen.hpp
@@ -53,6 +53,7 @@ class Screen {
     void adjustWindowSize();
     void calculateMaxZoom();
     void initShaders();
+    void applyFallbackPresentation();  // Logical presentation + scale mode per al path SDL_Renderer
 
     static Screen* instance_;
 
diff --git a/source/main.cpp b/source/main.cpp
index b89fb3b..99502dc 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -39,6 +39,15 @@ SDL_AppResult SDL_AppInit(void** /*appstate*/, int /*argc*/, char* /*argv*/[]) {
     Options::setConfigFile(std::string(file_getconfigfolder()) + "config.yaml");
     Options::loadFromFile();
 
+#ifdef __EMSCRIPTEN__
+    // MEMFS no persistix entre recàrregues: força valors sensats per a web.
+    Options::window.fullscreen = false;
+    Options::window.zoom = 1;
+    Options::video.aspect_ratio_4_3 = true;
+    Options::video.integer_scale = true;
+    Options::video.stretch_filter_linear = true;
+#endif
+
     // Carrega textos (idioma per defecte: valencià)
     Locale::load("locale/ca.yaml");