diff --git a/drm/shadertoy.c b/drm/shadertoy.c
index e60e00e..cf5d194 100644
--- a/drm/shadertoy.c
+++ b/drm/shadertoy.c
@@ -465,7 +465,7 @@ int indirect_buffer(float time)
   // fragment code
 
   const uint32_t fragment_shader[] = {
-    #include "shadertoy_sin.fs.inc"
+    #include "shadertoy_palette.fs.inc"
   };
   const int fragment_shader_length = (sizeof (fragment_shader)) / (sizeof (fragment_shader[0]));
   assert(fragment_shader_length % 6 == 0);
@@ -474,7 +474,7 @@ int indirect_buffer(float time)
   printf("fs instructions %d\n", fragment_shader_instructions);
 
   T0V(US_PIXSIZE
-      , US_PIXSIZE__PIX_SIZE(1) // pixel shader stack frame size
+      , US_PIXSIZE__PIX_SIZE(2) // pixel shader stack frame size
       );
 
   T0V(US_CODE_RANGE
diff --git a/drm/shadertoy_palette.fs.asm b/drm/shadertoy_palette.fs.asm
new file mode 100644
index 0000000..02d805b
--- /dev/null
+++ b/drm/shadertoy_palette.fs.asm
@@ -0,0 +1,53 @@
+-- CONST[0] = { time, 0, 0, 0 }
+-- CONST[1] = { PI_2, I_PI_2, 0, 0 },
+
+-- d = length(uv)
+src0.rgb = temp[0] :
+  temp[0].r    = DP3 src0.rg0 src0.rg0 ;
+src0.rgb = temp[0] :
+  temp[0].a    = RSQ |src0.r| ;
+src0.a   = temp[0] :
+  temp[0].a    = RCP src0.a ;
+
+-- i = vec3(0.25, 0.40625, 0.5625);
+-- td = time + d
+src0.a = float(40)   , -- 0.25
+src1.a = float(45)   , -- 0.40625
+src2.rgb = float(49) : -- 0.5625
+  temp[0].rgb = MAD src0.a10 src1.1a0 src2.00r ;
+
+src0.rgb = const[0]  ,
+src2.a = temp[0] :
+  temp[1].a   = MAD src0.1 src0.r src2.a ;
+
+-- t = i + vec3(td)
+src0.a   = temp[1] ,
+src0.rgb = temp[0] :
+  temp[0].rgb = MAD src0.111 src0.rgb src0.aaa ;
+
+-- j = fract(t)
+src0.rgb = temp[0] :
+  temp[0].rgb = FRC src0.rgb ;
+
+-- k = cos(j * 2π)
+src0.rgb = temp[0] :
+              COS src0.r ,
+  temp[0].r = SOP ;
+src0.rgb = temp[0] :
+              COS src0.g ,
+  temp[0].g = SOP ;
+src0.rgb = temp[0] :
+              COS src0.b ,
+  temp[0].b = SOP ;
+
+-- l = k * vec3(0.5, 0.5, 0.5) + vec3(0.5, 0.5, 0.5)
+src0.rgb = temp[0] ,
+src1.rgb = float(48) : -- 0.5
+  temp[0].rgb = MAD src0.rgb src1.rrr src1.rrr ;
+
+OUT TEX_SEM_WAIT
+src0.a   = temp[0] ,
+src0.rgb = temp[0] :
+  out[0].a     = MAX src0.1 src0.1 ,
+  out[0].rgb   = MAX src0.rgb src0.rgb ;
+,
diff --git a/drm/shadertoy_palette.fs.inc b/drm/shadertoy_palette.fs.inc
new file mode 100644
index 0000000..52a6e81
--- /dev/null
+++ b/drm/shadertoy_palette.fs.inc
@@ -0,0 +1,84 @@
+0x00000800,
+0x08020000,
+0x08020080,
+0x00840420,
+0x00000000,
+0x00000001,
+
+0x00004000,
+0x08020000,
+0x08020080,
+0x00000000,
+0x0004000b,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0000c00a,
+0x00000000,
+
+0x00003800,
+0x0b120080,
+0x0802b4a8,
+0x008f24cc,
+0x00000000,
+0x00092000,
+
+0x00004000,
+0x08020100,
+0x00020080,
+0x00000000,
+0x00018010,
+0x1c000000,
+
+0x00003800,
+0x08020000,
+0x08020001,
+0x004406d8,
+0x00000000,
+0x0036c000,
+
+0x00003800,
+0x08020000,
+0x08020080,
+0x00000220,
+0x00000000,
+0x00000009,
+
+0x00000800,
+0x08020000,
+0x08020080,
+0x00000000,
+0x0000000d,
+0x0000000a,
+
+0x00001000,
+0x08020000,
+0x08020080,
+0x00000000,
+0x0000400d,
+0x0000000a,
+
+0x00002000,
+0x08020000,
+0x08020080,
+0x00000000,
+0x0000800d,
+0x0000000a,
+
+0x00003800,
+0x0802c000,
+0x08020080,
+0x00002220,
+0x00000000,
+0x00001000,
+
+0x00078005,
+0x08020000,
+0x08020000,
+0x00440220,
+0x00c18003,
+0x00000005,
+