From dc804a95364685091889fb97ac45abec3bfd9ad8 Mon Sep 17 00:00:00 2001
From: reimar <reimar@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Tue, 4 Sep 2007 10:46:31 +0000
Subject: [PATCH] Add a bicubic scaler that needs a lot more instruction but no
 extra texture lookup

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@24338 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libvo/gl_common.c | 40 ++++++++++++++++++++++++++++++++++++++++
 libvo/gl_common.h |  2 ++
 2 files changed, 42 insertions(+)

diff --git a/libvo/gl_common.c b/libvo/gl_common.c
index a123f582b9..247f7269c6 100644
--- a/libvo/gl_common.c
+++ b/libvo/gl_common.c
@@ -708,6 +708,34 @@ static const char *bicub_filt_template_RECT =
   "MUL cdelta.yw, parmy.rrgg, {0, -1, 0, 1};"
   BICUB_FILT_MAIN("RECT");
 
+#define CALCWEIGHTS(t, s) \
+  "MAD "t", {-0.5, 0.1666, 0.3333, -0.3333}, "s", {1, 0, -0.5, 0.5};" \
+  "MAD "t", "t", "s", {0, 0, -0.5, 0.5};" \
+  "MAD "t", "t", "s", {-0.6666, 0, 0.8333, 0.1666};" \
+  "RCP a.x, "t".z;" \
+  "RCP a.y, "t".w;" \
+  "MAD "t".xy, "t".xyxy, a.xyxy, {1, 1, 0, 0};" \
+  "ADD "t".x, "t".xxxx, "s";" \
+  "SUB "t".y, "t".yyyy, "s";"
+
+static const char *bicub_notex_filt_template_2D =
+  "MAD coord.xy, fragment.texcoord[%c], {%f, %f}, {0.5, 0.5};"
+  "FRC coord.xy, coord.xyxy;"
+  CALCWEIGHTS("parmx", "coord.xxxx")
+  "MUL cdelta.xz, parmx.rrgg, {-%f, 0, %f, 0};"
+  CALCWEIGHTS("parmy", "coord.yyyy")
+  "MUL cdelta.yw, parmy.rrgg, {0, -%f, 0, %f};"
+  BICUB_FILT_MAIN("2D");
+
+static const char *bicub_notex_filt_template_RECT =
+  "ADD coord, fragment.texcoord[%c], {0.5, 0.5};"
+  "FRC coord.xy, coord.xyxy;"
+  CALCWEIGHTS("parmx", "coord.xxxx")
+  "MUL cdelta.xz, parmx.rrgg, {-1, 0, 1, 0};"
+  CALCWEIGHTS("parmy", "coord.yyyy")
+  "MUL cdelta.yw, parmy.rrgg, {0, -1, 0, 1};"
+  BICUB_FILT_MAIN("RECT");
+
 #define BICUB_X_FILT_MAIN(textype) \
   "ADD coord, fragment.texcoord[%c].xyxy, cdelta.xyxw;" \
   "ADD coord2, fragment.texcoord[%c].xyxy, cdelta.zyzw;" \
@@ -992,6 +1020,18 @@ static void add_scaler(int scaler, char **prog_pos, int *remain, char *texs,
                  texs[0], (float)1.0 / texw, (float)1.0 / texw,
                  in_tex, in_tex, in_tex, in_tex, out_comp);
       break;
+    case YUV_SCALER_BICUB_NOTEX:
+      if (rect)
+        snprintf(*prog_pos, *remain, bicub_notex_filt_template_RECT,
+                 in_tex,
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      else
+        snprintf(*prog_pos, *remain, bicub_notex_filt_template_2D,
+                 in_tex, (float)texw, (float)texh,
+                 (float)1.0 / texw, (float)1.0 / texw,
+                 (float)1.0 / texh, (float)1.0 / texh,
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      break;
   }
   *remain -= strlen(*prog_pos);
   *prog_pos += strlen(*prog_pos);
diff --git a/libvo/gl_common.h b/libvo/gl_common.h
index 53ee8ef08d..1d5ab8dede 100644
--- a/libvo/gl_common.h
+++ b/libvo/gl_common.h
@@ -241,6 +241,8 @@ int loadGPUProgram(GLenum target, char *prog);
 #define YUV_SCALER_BICUB 1
 //! use cubic scaling in X and normal linear scaling in Y direction
 #define YUV_SCALER_BICUB_X 2
+//! use cubic scaling without additional lookup texture
+#define YUV_SCALER_BICUB_NOTEX 3
 //! mask for conversion type
 #define YUV_CONVERSION_MASK 0xF
 //! mask for scaler type