add widescreen stretch option (#291)

parallel-rdp/interface.cpp

@@ -294,7 +294,7 @@ void rdp_close()
 
 static void calculate_viewport(float *x, float *y, float *width, float *height)
 {
-	const int32_t display_width = gfx_info.PAL ? 384 : 320;
+	const int32_t display_width = gfx_info.widescreen ? (gfx_info.PAL ? 512 : 426) : (gfx_info.PAL ? 384 : 320);
 	const int32_t display_height = gfx_info.PAL ? 288 : 240;
 
 	int w, h;

parallel-rdp/interface.hpp

@@ -17,6 +17,7 @@ extern "C"
 		uint32_t *DPC_END_REG;
 		uint32_t *DPC_STATUS_REG;
 		bool PAL;
+		bool widescreen;
 	} GFX_INFO;
 
 	typedef struct

src/ui/config.rs

@@ -45,6 +45,7 @@ pub struct Video {
     pub upscale: u32,
     pub integer_scaling: bool,
     pub fullscreen: bool,
+    pub widescreen: bool,
 }
 #[derive(serde::Serialize, serde::Deserialize)]
 pub struct Config {
@@ -96,6 +97,7 @@ impl Config {
                 upscale: 1,
                 integer_scaling: false,
                 fullscreen: false,
+                widescreen: false,
             },
         }
     }

src/ui/gui.rs

@@ -17,6 +17,7 @@ pub struct GopherEguiApp {
     upscale: u32,
     integer_scaling: bool,
     fullscreen: bool,
+    widescreen: bool,
     emulate_vru: bool,
     dinput: bool,
     show_vru_dialog: bool,
@@ -41,6 +42,7 @@ struct SaveConfig {
     upscale: u32,
     integer_scaling: bool,
     fullscreen: bool,
+    widescreen: bool,
     emulate_vru: bool,
 }
 
@@ -116,6 +118,7 @@ impl GopherEguiApp {
             upscale: config.video.upscale,
             integer_scaling: config.video.integer_scaling,
             fullscreen: config.video.fullscreen,
+            widescreen: config.video.widescreen,
             emulate_vru: config.input.emulate_vru,
             show_vru_dialog: false,
             dinput: false,
@@ -152,6 +155,7 @@ fn save_config(
     config.video.upscale = save_config_items.upscale;
     config.video.integer_scaling = save_config_items.integer_scaling;
     config.video.fullscreen = save_config_items.fullscreen;
+    config.video.widescreen = save_config_items.widescreen;
     config.input.emulate_vru = save_config_items.emulate_vru;
 }
 
@@ -165,6 +169,7 @@ impl Drop for GopherEguiApp {
             upscale: self.upscale,
             integer_scaling: self.integer_scaling,
             fullscreen: self.fullscreen,
+            widescreen: self.widescreen,
             emulate_vru: self.emulate_vru,
         };
         let mut config = ui::config::Config::new();
@@ -300,6 +305,7 @@ pub fn open_rom(app: &mut GopherEguiApp, ctx: &egui::Context) {
     let upscale = app.upscale;
     let integer_scaling = app.integer_scaling;
     let fullscreen = app.fullscreen;
+    let widescreen = app.widescreen;
     let emulate_vru = app.emulate_vru;
     let peer_addr;
     let session;
@@ -394,6 +400,7 @@ pub fn open_rom(app: &mut GopherEguiApp, ctx: &egui::Context) {
                     upscale,
                     integer_scaling,
                     fullscreen,
+                    widescreen,
                     emulate_vru,
                 };
 
@@ -606,6 +613,7 @@ impl eframe::App for GopherEguiApp {
             };
             ui.checkbox(&mut self.integer_scaling, "Integer Scaling");
             ui.checkbox(&mut self.fullscreen, "Fullscreen (Esc closes game)");
+            ui.checkbox(&mut self.widescreen, "Widescreen (stretch)");
 
             ui.add_space(16.0);
             ui.hyperlink_to("Wiki", "https://github.com/gopher64/gopher64/wiki");

src/ui/video.rs

@@ -16,11 +16,22 @@ pub fn init(device: &mut device::Device) {
     }
     flags |= sdl3_sys::video::SDL_WINDOW_INPUT_FOCUS;
 
-    let mut window_width = 640;
-    let mut window_height = 480;
+    let window_width;
+    let window_height;
     if device.cart.pal {
-        window_width = 768;
+        window_width = if device.ui.config.video.widescreen {
+            1024
+        } else {
+            768
+        };
         window_height = 576;
+    } else {
+        window_width = if device.ui.config.video.widescreen {
+            852
+        } else {
+            640
+        };
+        window_height = 480;
     }
     device.ui.window = unsafe {
         sdl3_sys::video::SDL_CreateWindow(title.as_ptr(), window_width, window_height, flags)
@@ -42,6 +53,7 @@ pub fn init(device: &mut device::Device) {
         DPC_END_REG: &mut device.rdp.regs_dpc[device::rdp::DPC_END_REG as usize],
         DPC_STATUS_REG: &mut device.rdp.regs_dpc[device::rdp::DPC_STATUS_REG as usize],
         PAL: device.cart.pal,
+        widescreen: device.ui.config.video.widescreen,
     };
 
     unsafe {
@@ -85,6 +97,7 @@ pub fn load_state(device: &mut device::Device) {
         DPC_END_REG: &mut device.rdp.regs_dpc[device::rdp::DPC_END_REG as usize],
         DPC_STATUS_REG: &mut device.rdp.regs_dpc[device::rdp::DPC_STATUS_REG as usize],
         PAL: device.cart.pal,
+        widescreen: device.ui.config.video.widescreen,
     };
     unsafe {
         rdp_new_processor(gfx_info, device.ui.config.video.upscale);