--- libvo/vo_gl.c.old	2002-11-11 18:20:26.000000000 +0300
+++ libvo/vo_gl.c	2002-12-25 00:04:05.000000000 +0300
@@ -58,6 +58,8 @@
 static uint32_t texture_width;
 static uint32_t texture_height;
 
+static int slice_height=1;
+
 static void resize(int x,int y){
   printf("[gl] Resize: %dx%d\n",x,y);
   glViewport( 0, 0, x, y );
@@ -278,7 +280,7 @@
 //static inline uint32_t draw_slice_x11(uint8_t *src[], uint32_t slice_num)
 static uint32_t draw_slice(uint8_t *src[], int stride[], int w,int h,int x,int y)
 {
-    int i;
+    int y0=0;
     int dstride=w*BYTES_PP;
     
 //    dstride=(dstride+15)&(~15);
@@ -286,17 +288,29 @@
 	yuv2rgb(ImageData, src[0], src[1], src[2], 
 			w,h, dstride, stride[0],stride[1]);
 
-    for(i=0;i<h;i++){
-      glTexSubImage2D( GL_TEXTURE_2D,  // target
+    if(slice_height != 0)
+    {
+      for(y0=0;y0<h-slice_height;y0+=slice_height){
+        glTexSubImage2D( GL_TEXTURE_2D,  // target
 		       0,              // level
 		       x,              // x offset
-		       y+i,            // y offset
+		       y+y0,            // y offset
 		       w,              // width
-		       1,              // height
+		       slice_height,              // height
 		       (BYTES_PP==4)?GL_RGBA:GL_RGB,        // format
 		       GL_UNSIGNED_BYTE, // type
-		       ImageData+i*dstride );        // *pixels
+		       ImageData+y0*dstride );        // *pixels
+      }
     }
+    glTexSubImage2D( GL_TEXTURE_2D,  // target
+		       0,              // level
+		       x,              // x offset
+		       y+y0,            // y offset
+		       w,              // width
+		       h-y0,              // height
+		       (BYTES_PP==4)?GL_RGBA:GL_RGB,        // format
+		       GL_UNSIGNED_BYTE, // type
+		       ImageData+y0*dstride );        // *pixels
 
 	return 0;
 }
@@ -304,23 +318,34 @@
 static inline uint32_t 
 draw_frame_x11_yv12(uint8_t *src[])
 {
-int i;
+int y0;
 //  printf("Converting YUV->RGB...\n");
 	yuv2rgb(ImageData, src[0], src[1], src[2],
 		image_width, image_height, 
 		image_width*BYTES_PP, image_width, image_width/2 );
 
-    for(i=0;i<image_height;i++){
-      glTexSubImage2D( GL_TEXTURE_2D,  // target
+    if(slice_height != 0){
+      for(y0=0;y0<image_height;y0++){
+        glTexSubImage2D( GL_TEXTURE_2D,  // target
 		       0,              // level
 		       0,              // x offset
-		       i,              // y offset
+		       y0,              // y offset
 		       image_width,    // width
-		       1,              // height
+		       slice_height,              // height
 		       (BYTES_PP==4)?GL_RGBA:GL_RGB,        // format
 		       GL_UNSIGNED_BYTE, // type
-		       ImageData+i*BYTES_PP*image_width );        // *pixels
+		       ImageData+y0*BYTES_PP*image_width );        // *pixels
+      }
     }
+    glTexSubImage2D( GL_TEXTURE_2D,  // target
+		       0,              // level
+		       0,              // x offset
+		       y0,              // y offset
+		       image_width,    // width
+		       image_height-y0,   // height
+		       (BYTES_PP==4)?GL_RGBA:GL_RGB,        // format
+		       GL_UNSIGNED_BYTE, // type
+		       ImageData+y0*BYTES_PP*image_width );        // *pixels
 
 	return 0; 
 }
@@ -329,29 +354,50 @@
 static inline uint32_t 
 draw_frame_x11_bgr(uint8_t *src[])
 {
-int i;
+int y0=0;
 uint8_t *s=src[0];
-uint8_t *de=&ImageData[3*image_width];
 
-    for(i=0;i<image_height;i++){
-      uint8_t *d=ImageData;
-      while(d<de){
-        d[0]=s[2];
-        d[1]=s[1];
-        d[2]=s[0];
-        s+=3;d+=3;
+    if(slice_height != 0)
+      for(y0=0;y0<image_height-slice_height;y0+=slice_height){
+        uint8_t *de=&ImageData[3*image_width*slice_height];
+        uint8_t *d=ImageData;
+        while(d<de){
+          d[0]=s[2];
+          d[1]=s[1];
+          d[2]=s[0];
+          s+=3;d+=3;
+        }
+        glTexSubImage2D( GL_TEXTURE_2D,  // target
+		       0,              // level
+		       0,              // x offset
+//		       image_height-1-i,  // y offset
+		       y0,  // y offset
+		       image_width,    // width
+		       slice_height,              // height
+		       (image_bytes==4)?GL_RGBA:GL_RGB,        // format
+		       GL_UNSIGNED_BYTE, // type
+		       ImageData);        // *pixels
       }
-      glTexSubImage2D( GL_TEXTURE_2D,  // target
+      do {
+        uint8_t *d=ImageData;
+        uint8_t *de=&ImageData[3*image_width*(image_height-y0)];
+        while(d<de){
+          d[0]=s[2];
+          d[1]=s[1];
+          d[2]=s[0];
+          s+=3;d+=3;
+        }
+        glTexSubImage2D( GL_TEXTURE_2D,  // target
 		       0,              // level
 		       0,              // x offset
 //		       image_height-1-i,  // y offset
-		       i,  // y offset
+		       y0,  // y offset
 		       image_width,    // width
-		       1,              // height
+		       image_height-y0,              // height
 		       (image_bytes==4)?GL_RGBA:GL_RGB,        // format
 		       GL_UNSIGNED_BYTE, // type
 		       ImageData);        // *pixels
-    }
+      } while(0);
 
 	return 0; 
 }
@@ -359,21 +405,32 @@
 static inline uint32_t 
 draw_frame_x11_rgb(uint8_t *src[])
 {
-int i;
+int y0;
 uint8_t *ImageData=src[0];
 
-    for(i=0;i<image_height;i++){
+    if(slice_height != 0)
+      for(y0=0;y0<image_height-slice_height;y0+=slice_height){
       glTexSubImage2D( GL_TEXTURE_2D,  // target
 		       0,              // level
 		       0,              // x offset
 //		       image_height-1-i,  // y offset
-		       i,  // y offset
+		       y0,  // y offset
 		       image_width,    // width
-		       1,              // height
+		       slice_height,              // height
 		       (image_bytes==4)?GL_RGBA:GL_RGB,        // format
 		       GL_UNSIGNED_BYTE, // type
-		       ImageData+i*image_bytes*image_width );        // *pixels
+		       ImageData+y0*image_bytes*image_width );        // *pixels
     }
+    glTexSubImage2D( GL_TEXTURE_2D,  // target
+		       0,              // level
+		       0,              // x offset
+		       y0,              // y offset
+		       image_width,    // width
+		       image_height-y0,   // height
+		       (image_bytes==4)?GL_RGBA:GL_RGB,        // format
+		       GL_UNSIGNED_BYTE, // type
+		       ImageData +y0*image_bytes*image_width);        // *pixels
+
 
 	return 0; 
 }
@@ -417,9 +474,15 @@
 {
     if(arg) 
     {
-	printf("[gl] Unknown subdevice: %s\n",arg);
-	return ENOSYS;
+	    slice_height = atoi(arg);
+	    if (slice_height <= 0)
+		    slice_height = 0;
+    }
+    else
+    {
+	    slice_height = 1;
     }
+    printf("[vo_gl] Using %d as slice_height (0 means image_height).\n", slice_height);
 
     if( !vo_init() ) return -1; // Can't open X11