bugfix when writing screenshot: was calculating rounded up size for VFS incorrectly.

also fix refcnt for tex_wrap temporarily until mem_assign/mem_get_ptr
do.

h_mgr: add disallow-reload support (required for wrapped ogl_tex since
they are not backed by a file)

This was SVN commit r2780.

source/lib/ogl.cpp

@@ -451,11 +451,6 @@ static void CALL_CONV emulate_glCompressedTexImage2D(
 	Tex t;
 	const uint flags = dxt;
 	(void)tex_wrap((uint)w, (uint)h, s3tc_bpp, flags, (void*)data, &t);
-	// .. hack: prevent <data> from being freed when tex_transform
-	//    replaces previous hm with the new transformed buffer.
-	//    (important because mipmapped images share the same mem alloc and
-	//    there's no way we know when to free that)
-	h_add_ref(t.hm);
 	(void)tex_transform(&t, TEX_DXT);
 
 	// uncompressed RGB[A] format info

source/lib/res/graphics/tex.cpp

@@ -516,6 +516,9 @@ int tex_wrap(uint w, uint h, uint bpp, uint flags, void* img, Tex* t)
 	void* reported_ptr = mem_get_ptr(t->hm);
 	t->ofs = (u8*)img - (u8*)reported_ptr;
 
+// TODO: remove when mem_assign / mem_get_ptr add a reference correctly
+h_add_ref(t->hm);
+
 	CHECK_TEX(t);
 	return 0;
 }
@@ -540,7 +543,6 @@ int tex_write(const char* fn, uint w, uint h, uint bpp, uint flags, void* in_img
 	const TexCodecVTbl* c;
 	CHECK_ERR(tex_codec_for_filename(fn, &c));
 
-	const size_t rounded_size = round_up(da.cur_size, FILE_BLOCK_SIZE);
 	// encode
 	int err = c->encode(&t, &da);
 	if(err < 0)
@@ -549,12 +551,13 @@ int tex_write(const char* fn, uint w, uint h, uint bpp, uint flags, void* in_img
 		debug_warn("tex_writefailed");
 		goto fail;
 	}
+	const size_t rounded_size = round_up(da.cur_size, FILE_BLOCK_SIZE);
 	CHECK_ERR(da_set_size(&da, rounded_size));
 	WARN_ERR(vfs_store(fn, da.base, da.pos));
 	err = 0;
 
 fail:
-	WARN_ERR(da_free(&da));
-	WARN_ERR(mem_free_h(t.hm));
+	(void)tex_free(&t);
+	(void)da_free(&da);
 	return err;
 }

source/lib/res/h_mgr.cpp

@@ -131,14 +131,15 @@ struct HDATA
 	// smaller bitfields combined into 1
 	u32 refs : REF_BITS;
 	u32 type_idx : TYPE_BITS;
-	u32 keep_open : 1;
-		// if set, do not actually release the resource (i.e. call dtor)
+	// .. if set, do not actually release the resource (i.e. call dtor)
 	//    when the handle is h_free-d, regardless of the refcount.
 	//    set by h_alloc; reset on exit and by housekeeping.
-	u32 unique : 1;
-		// HACK: prevent adding to h_find lookup index if flags & RES_UNIQUE
+	u32 keep_open : 1;
+	// .. HACK: prevent adding to h_find lookup index if flags & RES_UNIQUE
 	//    (because those handles might have several instances open,
 	//    which the index can't currently handle)
+	u32 unique : 1;
+	u32 disallow_reload : 1;
 
 	H_Type type;
 	
@@ -600,6 +601,8 @@ static Handle alloc_new_handle(H_Type type, const char* fn, uintptr_t key,
 	hd->refs = 1;
 	if(!(flags & RES_NO_CACHE))
 		hd->keep_open = 1;
+	if(flags & RES_DISALLOW_RELOAD)
+		hd->disallow_reload = 1;
 	hd->unique = (flags & RES_UNIQUE) != 0;
 	hd->fn = 0;
 	// .. filename is valid - store in hd
@@ -694,6 +697,7 @@ const char* h_filename(const Handle h)
 }
 
 
+// TODO: what if iterating through all handles is too slow?
 int h_reload(const char* fn)
 {
 	if(!fn)
@@ -704,26 +708,25 @@ int h_reload(const char* fn)
 
 	const u32 key = fnv_hash(fn);
 
-	i32 i;
 	// destroy (note: not free!) all handles backed by this file.
 	// do this before reloading any of them, because we don't specify reload
 	// order (the parent resource may be reloaded first, and load the child,
 	// whose original data would leak).
-	for(i = 0; i <= last_in_use; i++)
+	for(i32 i = 0; i <= last_in_use; i++)
 	{
 		HDATA* hd = h_data_from_idx(i);
-		if(hd && hd->key == key)
+		if(!hd || hd->key != key || hd->disallow_reload)
+			continue;
 		hd->type->dtor(hd->user);
 	}
 
 	int ret = 0;
 
 	// now reload all affected handles
-	// TODO: what if iterating through all handles is too slow?
-	for(i = 0; i <= last_in_use; i++)
+	for(i32 i = 0; i <= last_in_use; i++)
 	{
 		HDATA* hd = h_data_from_idx(i);
-		if(!hd || hd->key != key)
+		if(!hd || hd->key != key || hd->disallow_reload)
 			continue;
 
 		Handle h = handle(i, hd->tag);

source/lib/res/h_mgr.h

@@ -320,6 +320,7 @@ typedef H_VTbl* H_Type;
 
 // resource scope
 // used together with flags (e.g. in mem), so no separate type
+/*
 enum
 {
 	RES_TEMP   = 1,
@@ -328,19 +329,24 @@ enum
 };
 
 #define RES_SCOPE_MASK 7
+*/
 
 // h_alloc flags
 enum
 {
 	// alias for RES_TEMP scope. the handle will not be kept open.
-	RES_NO_CACHE = 1,
+	RES_NO_CACHE = 0x01,
 
 	// not cached, and will never reuse a previous instance
-	RES_UNIQUE = RES_NO_CACHE|16,
+	RES_UNIQUE = RES_NO_CACHE|0x10,
 
 	// the resource isn't backed by a file. the fn parameter is treated as the search key (uintptr_t)
 	// currently only used by mem manager
-	RES_KEY = 8
+	RES_KEY = 0x08,
+
+	// object is requesting it never be reloaded (e.g. because it's not
+	// backed by a file)
+	RES_DISALLOW_RELOAD = 0x20
 };