--- a/mojoshader.c	Tue May 31 16:01:10 2011 -0400
+++ b/mojoshader.c	Tue May 31 16:25:00 2011 -0400
@@ -7091,6 +7091,10 @@
     if ((tokcount < 2) || (SWAP32(tokens[1]) != PRES_ID))
         return;  // not a preshader.
 
+#if !SUPPORT_PRESHADERS
+    fail(ctx, "Preshader found, but preshader support is disabled!");
+#else
+
     assert(ctx->have_preshader == 0);  // !!! FIXME: can you have more than one?
     ctx->have_preshader = 1;
 
@@ -7396,6 +7400,7 @@
 parse_preshader_cleanup:
     free_symbols(ctx->free, ctx->malloc_data,
                  ctabdata.symbols, ctabdata.symbol_count);
+#endif
 } // parse_preshader
 
 

--- a/mojoshader_effects.c	Tue May 31 16:01:10 2011 -0400
+++ b/mojoshader_effects.c	Tue May 31 16:25:00 2011 -0400
@@ -12,7 +12,9 @@
 
 #include <math.h>
 
-void run_preshader(const MOJOSHADER_preshader *preshader, float *regs)
+#if SUPPORT_PRESHADERS
+void MOJOSHADER_runPreshader(const MOJOSHADER_preshader *preshader,
+                                 float *regs)
 {
     // this is fairly straightforward, as there aren't any branching
     //  opcodes in the preshader instruction set (at the moment, at least).
@@ -162,8 +164,8 @@
                 regs[operand->index + i] = (float) dst[i];
         } // else
     } // for
-} // run_preshader
-
+} // MOJOSHADER_runPreshader
+#endif
 
 static MOJOSHADER_effect MOJOSHADER_out_of_mem_effect = {
     1, &MOJOSHADER_out_of_mem_error, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

--- a/mojoshader_internal.h	Tue May 31 16:01:10 2011 -0400
+++ b/mojoshader_internal.h	Tue May 31 16:25:00 2011 -0400
@@ -60,7 +60,6 @@
 #define SUPPORT_PROFILE_ARB1_NV 1
 #endif
 
-
 #if SUPPORT_PROFILE_ARB1_NV && !SUPPORT_PROFILE_ARB1
 #error nv profiles require arb1 profile. Fix your build.
 #endif
@@ -70,6 +69,20 @@
 #endif
 
 
+// Other stuff you can disable...
+
+// This removes the preshader parsing and execution code. You can save some
+//  bytes if you have normal shaders and not Effect files.
+#ifndef SUPPORT_PRESHADERS
+#define SUPPORT_PRESHADERS 1
+#endif
+
+#if SUPPORT_PRESHADERS
+void MOJOSHADER_runPreshader(const MOJOSHADER_preshader *, float *);
+#else
+#define MOJOSHADER_runPreshader(a, b)
+#endif
+
 
 // Get basic wankery out of the way here...