X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=README.OMAP;h=2da9e26cb24d5f769842a2cc5acdf659c3d03308;hb=455c8c43b353b60ebbb70caa09ae87be49520838;hp=0b5bb4cbdce09fa0bdd6aaccd347309b177c30de;hpb=5d957fa546b1d2df1ccebc98c1a45cae38092f5e;p=sdl_omap.git

diff --git a/README.OMAP b/README.OMAP
index 0b5bb4c..2da9e26 100644
--- a/README.OMAP
+++ b/README.OMAP
@@ -37,9 +37,19 @@ Other environment variables:
 
 SDL_OMAP_LAYER_SIZE:
   Output layer size. Regardless what you set with SDL_SetVideoMode(), output
-  will be scaled to this size using hardware. Valid values:
+  will be scaled to this size using hardware with zero processing cost.
+  Note: scaling amount range is limited to roughly 1/4x-8x. The exact range
+  depends on various factors like version of the driver or OMAP hardware itself.
+  Valid values:
     "WxH", for example "640x480"
-    "fullscreen" for to cover whole screen.
+    "fullscreen" to cover whole screen.
+
+SDL_OMAP_BORDER_CUT:
+  This can be used to move parts of SDL surface out of screen, in other
+  words cut borders and zoom in. Format: <left>,<right>,<top>,<bottom>
+  For example, "0,0,16,0" would hide top 16 lines offscreen, making 17th
+  (16th if you count from 0) line the first visible.
+  Note: like for layer size ranges are limited.
 
 SDL_OMAP_VSYNC:
   Enables waiting for vertical sync on SDL_Flip() calls.
@@ -49,6 +59,15 @@ SDL_OMAP_DEFAULT_MODE:
   If the app doesn't specify resolution in SDL_SetVideoMode(), then use this.
   Should be specified in "WxH" format, for example "640x480".
 
+SDL_OMAP_FORCE_DOUBLEBUF:
+  This can force double buffering to on, which can help to eliminate tearing.
+  Note that if app isn't updating whole buffer each frame, it will glitch.
+  This is the same as specifying SDL_DOUBLEBUF to SDL_SetVideoMode.
+
+SDL_OMAP_NO_TS_TRANSLATE:
+  Disable automatic touchscreen screen -> layer coordinate translation,
+  return real screen coordinates.
+
 
 Config file
 -----------
@@ -60,6 +79,12 @@ options (only when omapdss driver is active):
 # same as SDL_OMAP_VSYNC
 force_vsync = 1/0
 
+# same as SDL_OMAP_FORCE_DOUBLEBUF
+force_doublebuf = 1/0
+
+# same as SDL_OMAP_NO_TS_TRANSLATE
+no_ts_translate = 1/0
+
 # can be used to bind a key to SDL keysym, good for quick ports.
 # Example:
 # bind ev_home = sdlk_space