diff --git a/game_compatibility.md b/game_compatibility.md
index e60a100..d39eb44 100644
--- a/game_compatibility.md
+++ b/game_compatibility.md
@@ -73,7 +73,7 @@ issues, please let me know or open a pull request to update this table.
 | Rance 02 -The Rebellious Maidens- (Fan TL)              | Supported   |       |
 | Rance 02 -The Rebellious Maidens- (MangaGamer)          | Supported   |       |
 | しゃーまんず・さんくちゅあり－巫女の聖域－              | Unknown     |       |
-| 大帝国                                                  | Unknown     |       |
+| 大帝国                                                  | Supported   |       |
 | ランス・クエスト                                        | Unsupported |       |
 | 母娘乱館                                                | Unknown     |       |
 | パステルチャイム3 バインドシーカー                      | Unsupported |       |
diff --git a/include/gfx/gfx.h b/include/gfx/gfx.h
index 332069b..46e81db 100644
--- a/include/gfx/gfx.h
+++ b/include/gfx/gfx.h
@@ -161,6 +161,7 @@ void gfx_copy_rot_zoom2(Texture *dst, float cx, float cy, Texture *src, float sc
 void gfx_copy_reverse_LR(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h);
 void gfx_copy_reverse_UD(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h);
 void gfx_copy_reverse_amap_LR(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h);
+void gfx_copy_reverse_LR_with_alpha_map(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h);
 void gfx_copy_rotate_y(Texture *dst, Texture *front, Texture *back, int sx, int sy, int w, int h, float rot, float mag);
 void gfx_copy_rotate_y_use_amap(Texture *dst, Texture *front, Texture *back, int sx, int sy, int w, int h, float rot, float mag);
 void gfx_copy_rotate_x(Texture *dst, Texture *front, Texture *back, int sx, int sy, int w, int h, float rot, float mag);
diff --git a/src/draw.c b/src/draw.c
index 48c8b4e..ae0a131 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -788,6 +788,7 @@ void gfx_copy_rot_zoom_use_amap(Texture *dst, Texture *src, int sx, int sy, int
 void gfx_copy_rot_zoom2(Texture *dst, float cx, float cy, Texture *src, float scx, float scy, float rot, float mag)
 {
 	gfx_fill_amap(dst, 0, 0, dst->w, dst->h, 0);
+	glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ONE, GL_ZERO);
 
 	// 1. scale src vertices to texture size
 	// 2. translate so that center point of copy region is at origin
@@ -805,7 +806,8 @@ void gfx_copy_rot_zoom2(Texture *dst, float cx, float cy, Texture *src, float sc
 	mat4 wv_transform = WV_TRANSFORM(dst->w, dst->h);
 
 	struct copy_data data = ROTATE_DATA(dst, 0, 0, src->w, src->h);
-	run_draw_shader(&hitbox_noblend_shader.s, dst, src, mw_transform, wv_transform, &data);
+	run_draw_shader(&hitbox_shader.s, dst, src, mw_transform, wv_transform, &data);
+	restore_blend_mode();
 }
 
 static void copy_rotate_y(Texture *dst, Texture *front, Texture *back, int sx, int sy, int w, int h, float rot, float mag, Shader *shader)
@@ -935,6 +937,23 @@ void gfx_copy_reverse_amap_LR(Texture *dst, int dx, int dy, Texture *src, int sx
 	restore_blend_mode();
 }
 
+void gfx_copy_reverse_LR_with_alpha_map(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h)
+{
+	mat4 mw_transform = MAT4(
+	     -src->w, 0,      0, sx + w,
+	     0,       src->h, 0, -sy,
+	     0,       0,      1, 0,
+	     0,       0,      0, 1);
+	mat4 wv_transform = WV_TRANSFORM(w, h);
+
+	glBlendFuncSeparate(GL_ONE, GL_ZERO, GL_ONE, GL_ZERO);
+
+	struct copy_data data = COPY_DATA(dx, dy, sx, sy, w, h);
+	run_draw_shader(&copy_shader.s, dst, src, mw_transform, wv_transform, &data);
+
+	restore_blend_mode();
+}
+
 void gfx_copy_width_blur(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h, int blur)
 {
 	GLfloat f_rate = 1.0 / (blur * 2 + 1);
diff --git a/src/hll/DrawGraph.c b/src/hll/DrawGraph.c
index 65f8c62..f787255 100644
--- a/src/hll/DrawGraph.c
+++ b/src/hll/DrawGraph.c
@@ -375,6 +375,13 @@ static void DrawGraph_CopyReverseAMapLR(int dst, int dx, int dy, int src, int sx
 
 //void DrawGraph_CopyReverseAMapUD(int dst, int dx, int dy, int src, int sx, int sy, int w, int h);
 
+static void DrawGraph_CopyReverseLRWithAMap(int dst, int dx, int dy, int src, int sx, int sy, int w, int h)
+{
+	gfx_copy_reverse_LR_with_alpha_map(DTEX(dst), dx, dy, STEX(src), sx, sy, w, h);
+}
+
+//void DrawGraph_CopyReverseUDWithAMap(int nDest, int nDx, int nDy, int nSrc, int nSx, int nSy, int nWidth, int nHeight);
+
 static void DrawGraph_CopyWidthBlur(int dst, int dx, int dy, int src, int sx, int sy, int w, int h, int blur)
 {
 	gfx_copy_width_blur(DTEX(dst), dx, dy, STEX(src), sx, sy, w, h, blur);
@@ -549,6 +556,8 @@ HLL_LIBRARY(DrawGraph,
 	    HLL_EXPORT(CopyReverseUD, DrawGraph_CopyReverseUD),
 	    HLL_EXPORT(CopyReverseAMapLR, DrawGraph_CopyReverseAMapLR),
 	    //HLL_EXPORT(CopyReverseAMapUD, DrawGraph_CopyReverseAMapUD),
+	    HLL_EXPORT(CopyReverseLRWithAMap, DrawGraph_CopyReverseLRWithAMap),
+	    HLL_TODO_EXPORT(CopyReverseUDWithAMap, DrawGraph_CopyReverseUDWithAMap),
 	    HLL_EXPORT(CopyWidthBlur, DrawGraph_CopyWidthBlur),
 	    HLL_EXPORT(CopyHeightBlur, DrawGraph_CopyHeightBlur),
 	    HLL_EXPORT(CopyAMapWidthBlur, DrawGraph_CopyAMapWidthBlur),
diff --git a/src/hll/FileOperation.c b/src/hll/FileOperation.c
index 608f6ca..3672697 100644
--- a/src/hll/FileOperation.c
+++ b/src/hll/FileOperation.c
@@ -30,7 +30,15 @@
 #include "vm/page.h"
 #include "hll.h"
 
-//bool FileOperation_ExistFile(string FileName);
+static bool FileOperation_ExistFile(struct string *file_name)
+{
+	char *path = unix_path(file_name->text);
+	ustat s;
+	bool result = stat_utf8(path, &s) == 0 && S_ISREG(s.st_mode);
+	free(path);
+	return result;
+}
+
 //bool FileOperation_DeleteFile(string FileName);
 
 static bool FileOperation_CopyFile(struct string *dest_file_name, struct string *src_file_name)
@@ -46,7 +54,25 @@ static bool FileOperation_CopyFile(struct string *dest_file_name, struct string
 //bool FileOperation_GetFileCreationTime(string FileName, ref int nYear, ref int nMonth, ref int nDay, ref int nWeek, ref int nHour, ref int nMin, ref int nSecond);
 //bool FileOperation_GetFileLastAccessTime(string FileName, ref int nYear, ref int nMonth, ref int nDay, ref int nWeek, ref int nHour, ref int nMin, ref int nSecond);
 //bool FileOperation_GetFileLastWriteTime(string FileName, ref int nYear, ref int nMonth, ref int nDay, ref int nWeek, ref int nHour, ref int nMin, ref int nSecond);
-//bool FileOperation_GetFileSize(string FileName, ref int nSize);
+
+static bool FileOperation_GetFileSize(struct string *file_name, int *size)
+{
+	char *path = unix_path(file_name->text);
+	ustat s;
+	if (stat_utf8(path, &s) < 0) {
+		WARNING("stat(\"%s\"): %s", display_utf0(path), strerror(errno));
+		free(path);
+		return false;
+	}
+	if (!S_ISREG(s.st_mode)) {
+		WARNING("stat(\"%s\"): not a regular file", display_utf0(path));
+		free(path);
+		return false;
+	}
+	*size = s.st_size;
+	free(path);
+	return true;
+}
 
 static bool FileOperation_ExistFolder(struct string *folder_name)
 {
@@ -190,13 +216,13 @@ static bool FileOperation_GetFolderList(struct string *folder_name, struct page
 }
 
 HLL_LIBRARY(FileOperation,
-	    HLL_TODO_EXPORT(ExistFile, FileOperation_ExistFile),
+	    HLL_EXPORT(ExistFile, FileOperation_ExistFile),
 	    HLL_TODO_EXPORT(DeleteFile, FileOperation_DeleteFile),
 	    HLL_EXPORT(CopyFile, FileOperation_CopyFile),
 	    HLL_TODO_EXPORT(GetFileCreationTime, FileOperation_GetFileCreationTime),
 	    HLL_TODO_EXPORT(GetFileLastAccessTime, FileOperation_GetFileLastAccessTime),
 	    HLL_TODO_EXPORT(GetFileLastWriteTime, FileOperation_GetFileLastWriteTime),
-	    HLL_TODO_EXPORT(GetFileSize, FileOperation_GetFileSize),
+	    HLL_EXPORT(GetFileSize, FileOperation_GetFileSize),
 	    HLL_EXPORT(ExistFolder, FileOperation_ExistFolder),
 	    HLL_EXPORT(CreateFolder, FileOperation_CreateFolder),
 	    HLL_EXPORT(DeleteFolder, FileOperation_DeleteFolder),