Use anisotropy by default for better rotation

Author: cloudwu

src/data/settingdefault.dl

@@ -12,3 +12,5 @@ high_dpi : false
 window_title : soluna
 background : 0x4080c0
 tmpbuffer_size : 0x20000
+text_sampler :
+	max_anisotropy : 16

src/render.c

@@ -530,6 +530,17 @@ lsampler(lua_State *L) {
 	desc.mag_filter = read_enum(L, "mag_filter", filter);
 	desc.mipmap_filter = read_enum(L, "mipmap_filter", filter);
 
+	if (lua_getfield(L, 1, "max_anisotropy") == LUA_TNUMBER) {
+		int max_anisotropy = lua_tointeger(L, -1);
+		if (max_anisotropy > 0) {
+			desc.min_filter = SG_FILTER_LINEAR;
+			desc.mag_filter = SG_FILTER_LINEAR;
+			desc.mipmap_filter = SG_FILTER_LINEAR;
+			desc.max_anisotropy = max_anisotropy;
+		}
+	}
+	lua_pop(L, 1);
+
 	static struct enum_string wrap[] = {
 		{ "repeat", SG_WRAP_REPEAT },
 		{ "edge", SG_WRAP_CLAMP_TO_EDGE },

src/service/render.lua

@@ -290,7 +290,7 @@ local function render_init(arg)
 			color0 = setting.background,
 			swapchain = true,
 		},
-		default_sampler = render.sampler { label = "texquad-sampler" },
+		default_sampler = render.sampler { label = "texquad-sampler", max_anisotropy = 16 },
 		textures = {},
 		font_texture = font_texture,
 		views = views,