--- a/src/canvas-generic.cpp	2018-05-29 21:12:48.572424783 +0800
+++ b/src/canvas-generic.cpp	2018-05-29 20:45:04.016472804 +0800
@@ -34,6 +34,7 @@
  * Public methods *
  ******************/
 
+extern char *argv_char[8];
 bool
 CanvasGeneric::init()
 {
@@ -249,10 +250,13 @@ CanvasGeneric::resize_no_viewport(int wi
     }
 
     native_window_ = native_state_.window(cur_properties);
-
-    width_ = cur_properties.width;
-    height_ = cur_properties.height;
-
+    if(Options::resolution && Options::offscreen){
+	    width_ = atoi(argv_char[3]);
+	    height_ = atoi(argv_char[4]);
+    }else{
+        width_ = cur_properties.width;
+        height_ = cur_properties.height;
+    }
     if (color_renderbuffer_) {
         glBindRenderbuffer(GL_RENDERBUFFER, color_renderbuffer_);
         glRenderbufferStorage(GL_RENDERBUFFER, gl_color_format_,
@@ -264,7 +268,6 @@ CanvasGeneric::resize_no_viewport(int wi
         glRenderbufferStorage(GL_RENDERBUFFER, gl_depth_format_,
                               width_, height_);
     }
-
     projection_ = LibMatrix::Mat4::perspective(60.0, width_ / static_cast<float>(height_),
                                                1.0, 1024.0);
 
--- a/src/main.cpp	2018-05-29 21:12:39.516425044 +0800
+++ b/src/main.cpp	2018-05-29 20:45:03.656472814 +0800
@@ -56,6 +56,7 @@ using std::vector;
 using std::map;
 using std::string;
 
+char *argv_char[8];
 static void
 list_scenes()
 {
@@ -151,7 +152,9 @@ main(int argc, char *argv[])
         Options::print_help();
         return 0;
     }
-
+    for(int i = 0; i < argc; ++i){
+        argv_char[i] = argv[i];
+    }
     /* Force 800x600 output for validation */
     if (Options::validate &&
         Options::size != std::pair<int,int>(800, 600))
--- a/src/native-state-fbdev.cpp	2018-05-29 21:13:16.252423984 +0800
+++ b/src/native-state-fbdev.cpp	2018-05-29 20:45:03.652472814 +0800
@@ -31,6 +31,7 @@
 #include <unistd.h>
 #include <sys/ioctl.h>
 #include <linux/fb.h>
+#include "options.h"
 #if HAS_MALI
 #include <EGL/egl.h>
 #endif
@@ -43,7 +44,7 @@
 /******************
  * Public methods *
  ******************/
-
+extern char *argv_char[8];
 bool
 NativeStateFBDEV::init_display()
 {
@@ -62,6 +63,8 @@ bool
 NativeStateFBDEV::create_window(WindowProperties const& /*properties*/)
 {
     struct fb_var_screeninfo fb_var;
+    unsigned int resolution_width;
+    unsigned int resolution_height;
     if (fd == -1) {
         Log::error("Error: display has not been initialized!\n");
         return false;
@@ -71,9 +74,26 @@ NativeStateFBDEV::create_window(WindowPr
         Log::error("Error: cannot get variable frame buffer info\n");
         return false;
     }
-    winprops.width = fb_var.xres;
-    winprops.height = fb_var.yres;
-    winprops.fullscreen = true;
+    if(Options::resolution){
+        resolution_width = atoi(argv_char[2]);
+        resolution_height = atoi(argv_char[3]);
+            if(!Options::offscreen){
+            if(resolution_width > fb_var.xres || resolution_height > fb_var.yres){
+                printf("Error:resolution > fb\n");
+                return false;
+            }else{
+                fb_var.xres = resolution_width;
+                fb_var.yres = resolution_height;
+            }
+            }
+        }else if(Options::offscreen){
+             winprops.width = fb_var.xres;
+             winprops.height = fb_var.yres;
+             winprops.fullscreen = true;
+        }
+        winprops.width = fb_var.xres;
+        winprops.height = fb_var.yres;
+        winprops.fullscreen = true;
     return true;
 }
 
--- a/src/options.cpp	2018-05-29 21:12:12.484425824 +0800
+++ b/src/options.cpp	2018-05-29 20:45:03.640472814 +0800
@@ -41,6 +41,7 @@ bool Options::reuse_context = false;
 bool Options::run_forever = false;
 bool Options::annotate = false;
 bool Options::offscreen = false;
+bool Options::resolution = false;
 GLVisualConfig Options::visual_config;
 
 static struct option long_options[] = {
@@ -50,6 +51,7 @@ static struct option long_options[] = {
     {"validate", 0, 0, 0},
     {"frame-end", 1, 0, 0},
     {"off-screen", 0, 0, 0},
+    {"resolution", 0, 0, 0},
     {"visual-config", 1, 0, 0},
     {"reuse-context", 0, 0, 0},
     {"run-forever", 0, 0, 0},
@@ -125,6 +127,7 @@ Options::print_help()
            "                         running the benchmarks\n"
            "      --frame-end METHOD How to end a frame [default,none,swap,finish,readpixels]\n"
            "      --off-screen       Render to an off-screen surface\n"
+           "      --resolution       screen resolution\n"
            "      --visual-config C  The visual configuration to use for the rendering\n"
            "                         target: 'red=R:green=G:blue=B:alpha=A:buffer=BUF'.\n"
            "                         The parameters may be defined in any order, and any\n"
@@ -175,6 +178,8 @@ Options::parse_args(int argc, char **arg
             Options::frame_end = frame_end_from_str(optarg);
         else if (!strcmp(optname, "off-screen"))
             Options::offscreen = true;
+	else if (!strcmp(optname, "resolution"))
+	    Options::resolution = true;
         else if (!strcmp(optname, "visual-config"))
             Options::visual_config = GLVisualConfig(optarg);
         else if (!strcmp(optname, "reuse-context"))
--- a/src/options.h	2018-05-29 21:12:15.868425726 +0800
+++ b/src/options.h	2018-05-29 20:45:03.944472806 +0800
@@ -53,6 +53,7 @@ struct Options {
     static bool run_forever;
     static bool annotate;
     static bool offscreen;
+    static bool resolution;
     static GLVisualConfig visual_config;
 };