Added integer scaling option

Might help with #81

src/core/n64video.h

@@ -100,6 +100,7 @@ struct n64video_config
         bool hide_overscan;         // crop to visible area if true
         bool vsync;                 // enable vsync if true
         bool exclusive;             // run in exclusive mode when in fullscreen if true
+        bool integer_scaling;       // one native pixel is displayed as a multiple of a screen pixel if true
     } vi;
     struct {
         enum dp_compat_profile compat;  // multithreading compatibility mode

src/output/vdac.c

@@ -19,6 +19,7 @@
 
 static bool m_fbo_enabled;
 static GLuint m_fbo;
+static bool m_integer_scaling;
 
 static GLuint m_fbtex;
 static uint32_t m_fbtex_width;
@@ -278,6 +279,9 @@ void vdac_init(struct n64video_config* config)
     // read with exact FB size in non-filtered modes
     m_rawtex_read = config->vi.mode != VI_MODE_NORMAL;
 
+    // save integer scaling flag, will be used later
+    m_integer_scaling = config->vi.integer_scaling;
+
     // check if there was an error when using any of the commands above
     gl_check_errors();
 }
@@ -393,19 +397,37 @@ void vdac_sync(bool valid)
         return;
     }
 
-    int32_t hw = m_fbtex_height * win_width;
-    int32_t wh = m_fbtex_width * win_height;
-
-    // add letterboxes or pillarboxes if the window has a different aspect ratio
-    // than the current display mode
-    if (hw > wh) {
-        int32_t w_max = wh / m_fbtex_height;
-        win_x += (win_width - w_max) / 2;
-        win_width = w_max;
-    } else if (hw < wh) {
-        int32_t h_max = hw / m_fbtex_width;
-        win_y += (win_height - h_max) / 2;
-        win_height = h_max;
+    if (m_integer_scaling) {
+        // get smallest integer scale that is at least 1
+        uint32_t scale_x = (uint32_t)win_width < m_fbtex_width ? 1 : (uint32_t)win_width / m_fbtex_width;
+        uint32_t scale_y = (uint32_t)win_height < m_fbtex_height ? 1 : (uint32_t)win_height / m_fbtex_height;
+        uint32_t scale = scale_x > scale_y ? scale_x : scale_y;
+
+        // get new window size (or rather viewport size in this context)
+        int32_t win_width_new = m_fbtex_width * scale;
+        int32_t win_height_new = m_fbtex_height * scale;
+
+        // apply new size and offset
+        win_x = (win_width - win_width_new) / 2;
+        win_y = (win_height - win_height_new) / 2;
+
+        win_width = win_width_new;
+        win_height = win_height_new;
+    } else {
+        int32_t hw = m_fbtex_height * win_width;
+        int32_t wh = m_fbtex_width * win_height;
+
+        // add letterboxes or pillarboxes if the window has a different aspect ratio
+        // than the current display mode
+        if (hw > wh) {
+            int32_t w_max = wh / m_fbtex_height;
+            win_x += (win_width - w_max) / 2;
+            win_width = w_max;
+        } else if (hw < wh) {
+            int32_t h_max = hw / m_fbtex_width;
+            win_y += (win_height - h_max) / 2;
+            win_height = h_max;
+        }
     }
 
     if (m_fbo_enabled) {

src/plugin/mupen64plus/gfx_m64p.c

@@ -33,6 +33,7 @@
 #define KEY_VI_INTERP "ViInterpolation"
 #define KEY_VI_WIDESCREEN "ViWidescreen"
 #define KEY_VI_HIDE_OVERSCAN "ViHideOverscan"
+#define KEY_VI_INTEGER_SCALING "ViIntegerScaling"
 
 #define KEY_DP_COMPAT "DpCompat"
 
@@ -117,6 +118,7 @@ EXPORT m64p_error CALL PluginStartup(m64p_dynlib_handle _CoreLibHandle, void *Co
     ConfigSetDefaultInt(configVideoAngrylionPlus, KEY_VI_INTERP, config.vi.interp, "Scaling interpolation type (0=NN, 1=Linear)");
     ConfigSetDefaultBool(configVideoAngrylionPlus, KEY_VI_WIDESCREEN, config.vi.widescreen, "Use anamorphic 16:9 output mode if True");
     ConfigSetDefaultBool(configVideoAngrylionPlus, KEY_VI_HIDE_OVERSCAN, config.vi.hide_overscan, "Hide overscan area in filteded mode if True");
+    ConfigSetDefaultBool(configVideoAngrylionPlus, KEY_VI_INTEGER_SCALING, config.vi.integer_scaling, "Display upscaled pixels as groups of 1x1, 2x2, 3x3, etc. if True");
     ConfigSetDefaultInt(configVideoAngrylionPlus, KEY_DP_COMPAT, config.dp.compat, "Compatibility mode (0=Fast 1=Moderate 2=Slow");
 
     ConfigSaveSection("Video-General");
@@ -204,6 +206,7 @@ EXPORT int CALL RomOpen (void)
     config.vi.interp = ConfigGetParamInt(configVideoAngrylionPlus, KEY_VI_INTERP);
     config.vi.widescreen = ConfigGetParamBool(configVideoAngrylionPlus, KEY_VI_WIDESCREEN);
     config.vi.hide_overscan = ConfigGetParamBool(configVideoAngrylionPlus, KEY_VI_HIDE_OVERSCAN);
+    config.vi.integer_scaling = ConfigGetParamBool(configVideoAngrylionPlus, KEY_VI_INTEGER_SCALING);
 
     config.dp.compat = ConfigGetParamInt(configVideoAngrylionPlus, KEY_DP_COMPAT);
 

src/plugin/zilmar/config.c

@@ -49,6 +49,7 @@ static HWND dlg_check_vi_widescreen;
 static HWND dlg_check_vi_overscan;
 static HWND dlg_check_vi_exclusive;
 static HWND dlg_check_vi_vsync;
+static HWND dlg_check_vi_integer_scaling;
 static HWND dlg_combo_dp_compat;
 static HWND dlg_spin_workers;
 static HWND dlg_edit_workers;
@@ -119,6 +120,7 @@ INT_PTR CALLBACK config_dialog_proc(HWND hwnd, UINT iMessage, WPARAM wParam, LPA
             CONFIG_DLG_INIT_CHECKBOX(IDC_CHECK_VI_OVERSCAN, dlg_check_vi_overscan, config.vi.hide_overscan);
             CONFIG_DLG_INIT_CHECKBOX(IDC_CHECK_VI_EXCLUSIVE, dlg_check_vi_exclusive, config.vi.exclusive);
             CONFIG_DLG_INIT_CHECKBOX(IDC_CHECK_VI_VSYNC, dlg_check_vi_vsync, config.vi.vsync);
+            CONFIG_DLG_INIT_CHECKBOX(IDC_CHECK_VI_INTEGER_SCALING, dlg_check_vi_integer_scaling, config.vi.integer_scaling);
 
             dlg_edit_workers = GetDlgItem(hwnd, IDC_EDIT_WORKERS);
             SetDlgItemInt(hwnd, IDC_EDIT_WORKERS, config.num_workers, FALSE);
@@ -159,6 +161,7 @@ INT_PTR CALLBACK config_dialog_proc(HWND hwnd, UINT iMessage, WPARAM wParam, LPA
                     config.vi.hide_overscan = SendMessage(dlg_check_vi_overscan, BM_GETCHECK, 0, 0);
                     config.vi.exclusive = SendMessage(dlg_check_vi_exclusive, BM_GETCHECK, 0, 0);
                     config.vi.vsync = SendMessage(dlg_check_vi_vsync, BM_GETCHECK, 0, 0);
+                    config.vi.integer_scaling = SendMessage(dlg_check_vi_integer_scaling, BM_GETCHECK, 0, 0);
                     config.dp.compat = SendMessage(dlg_combo_dp_compat, CB_GETCURSEL, 0, 0);
                     config.parallel = SendMessage(dlg_check_multithread, BM_GETCHECK, 0, 0);
                     config.num_workers = GetDlgItemInt(hwnd, IDC_EDIT_WORKERS, FALSE, FALSE);