From f758f5fb701dd57fa67c139686f0d8f0aab470ae Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Thu, 22 Sep 2022 01:11:56 +0900
Subject: [PATCH] [renderer] Respond to window size changes

Currently, only gl, glsl and sw are working, vulkan needs its swapchain
to be rebuilt, and there are minor issues with the hud and console
resizing.
---
 libs/video/renderer/r_screen.c  | 17 +++++++++++++++++
 libs/video/renderer/sw/d_init.c | 28 ++++++++++++++++++----------
 libs/video/targets/vid_x11_sw.c |  6 ++++++
 3 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/libs/video/renderer/r_screen.c b/libs/video/renderer/r_screen.c
index 4106220f8..541cb3abb 100644
--- a/libs/video/renderer/r_screen.c
+++ b/libs/video/renderer/r_screen.c
@@ -183,6 +183,7 @@ SCR_CalcRefdef (void)
 
 	// force a background redraw
 	r_data->scr_fullupdate = 0;
+	r_funcs->bind_framebuffer (0);
 }
 
 static void
@@ -435,6 +436,21 @@ viewsize_listener (void *data, const cvar_t *cvar)
 	update_vrect ();
 }
 
+static void
+vidsize_listener (void *data, const viddef_t *vdef)
+{
+	update_vrect ();
+	if (fisheye_cube_map) {
+		r_funcs->destroy_frame_buffer (fisheye_cube_map);
+		fisheye_cube_map = 0;
+	}
+	if (warp_buffer) {
+		r_funcs->destroy_frame_buffer (warp_buffer);
+		warp_buffer = 0;
+	}
+	r_funcs->set_fov (tan_fov_x, tan_fov_y);
+}
+
 void
 SCR_Init (void)
 {
@@ -453,6 +469,7 @@ SCR_Init (void)
 
 	cvar_t     *var = Cvar_FindVar ("viewsize");
 	Cvar_AddListener (var, viewsize_listener, 0);
+	VID_OnVidResize_AddListener (vidsize_listener, 0);
 	update_vrect ();
 }
 
diff --git a/libs/video/renderer/sw/d_init.c b/libs/video/renderer/sw/d_init.c
index e5daaf439..b7e475ac1 100644
--- a/libs/video/renderer/sw/d_init.c
+++ b/libs/video/renderer/sw/d_init.c
@@ -49,6 +49,22 @@ static byte *surfcache;
 
 void        (*d_drawspans) (espan_t *pspan);
 
+static void
+d_vidsize_listener (void *data, const viddef_t *vid)
+{
+	int         cachesize = D_SurfaceCacheForRes (vid->width, vid->height);
+
+	if (surfcache) {
+		D_FlushCaches (vid->vid_internal->data);
+		free (surfcache);
+		surfcache = 0;
+	}
+	surfcache = calloc (cachesize, 1);
+	vid->vid_internal->init_buffers (vid->vid_internal->data);
+	D_InitCaches (surfcache, cachesize);
+
+	viddef.recalc_refdef = 1;
+}
 
 void
 D_Init (void)
@@ -61,16 +77,8 @@ D_Init (void)
 
 	vid->vid_internal->flush_caches = D_FlushCaches;
 
-	int         cachesize = D_SurfaceCacheForRes (vid->width, vid->height);
-
-	if (surfcache) {
-		D_FlushCaches (vid->vid_internal->data);
-		free (surfcache);
-		surfcache = 0;
-	}
-	surfcache = calloc (cachesize, 1);
-	vid->vid_internal->init_buffers (vid->vid_internal->data);
-	D_InitCaches (surfcache, cachesize);
+	VID_OnVidResize_AddListener (d_vidsize_listener, 0);
+	d_vidsize_listener (0, vr_data.vid);
 }
 
 void
diff --git a/libs/video/targets/vid_x11_sw.c b/libs/video/targets/vid_x11_sw.c
index 658a11ac2..3d5ef4526 100644
--- a/libs/video/targets/vid_x11_sw.c
+++ b/libs/video/targets/vid_x11_sw.c
@@ -640,13 +640,19 @@ x11_init_buffers (void *data)
 	if (x_visinfo->depth != 8) {
 		if (swfb.color)
 			free (swfb.color);
+		if (swfb.depth)
+			free (swfb.depth);
 		swfb.rowbytes = viddef.width;
 		swfb.color = calloc (swfb.rowbytes, viddef.height);
+		swfb.depth = 0;
 		if (!swfb.color)
 			Sys_Error ("Not enough memory for video mode");
 	} else {
 		swfb.rowbytes = x_framebuffer[current_framebuffer]->bytes_per_line;
 		swfb.color = (byte *) x_framebuffer[current_framebuffer]->data;
+		if (swfb.depth)
+			free (swfb.depth);
+		swfb.depth = 0;
 	}
 }