Use tcc and the emitted C code from s_fragprog_to_c.c to dynamically compile

and execute fragment programs.  Very limited and experimental, but works
well enough to run arbfplight.c.

	http://fabrice.bellard.free.fr/tcc/

Compile with 'make linux-tcc', being sure to make clean first.

6 files changed, 264 insertions, 15 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index b74eeaccca..aeeab82733 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1579,6 +1579,11 @@ struct fragment_program
    GLuint NumTexIndirections;
    GLenum FogOption;
    struct program_parameter_list *Parameters; /**< array [NumParameters] */
+
+#ifdef USE_TCC
+   char c_str[4096];		/* experimental... */
+   int c_strlen;
+#endif
 };
 
 
diff --git a/src/mesa/sources b/src/mesa/sources
index 249734f783..14c4205bbd 100644
--- a/src/mesa/sources
+++ b/src/mesa/sources
@@ -70,6 +70,7 @@ ARRAY_CACHE_SOURCES = \
 	array_cache/ac_import.c
 
 SWRAST_SOURCES = \
+	swrast/s_fragprog_to_c.c \
 	swrast/s_aaline.c \
 	swrast/s_aatriangle.c \
 	swrast/s_accum.c \
@@ -95,6 +96,7 @@ SWRAST_SOURCES = \
 	swrast/s_readpix.c \
 	swrast/s_span.c \
 	swrast/s_stencil.c \
+	swrast/s_tcc.c \
 	swrast/s_texture.c \
 	swrast/s_texstore.c \
 	swrast/s_triangle.c \
diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h
index d6a14e6b4a..9d14c89bd6 100644
--- a/src/mesa/swrast/s_context.h
+++ b/src/mesa/swrast/s_context.h
@@ -384,4 +384,18 @@ _swrast_validate_derived( GLcontext *ctx );
 #define FixedToChan(X)  FixedToInt(X)
 #endif
 
+
+
+extern void 
+_swrast_translate_program( GLcontext *ctx );
+
+extern GLboolean 
+_swrast_execute_codegen_program(GLcontext *ctx,
+				const struct fragment_program *program, 
+				GLuint maxInst,
+				struct fp_machine *machine, 
+				const struct sw_span *span,
+				GLuint column );
+
+
 #endif
diff --git a/src/mesa/swrast/s_fragprog_to_c.c b/src/mesa/swrast/s_fragprog_to_c.c
index f4bae2a82d..647510a4c9 100644
--- a/src/mesa/swrast/s_fragprog_to_c.c
+++ b/src/mesa/swrast/s_fragprog_to_c.c
@@ -157,19 +157,20 @@ static void emit( struct fragment_program *p,
    va_list ap;
    va_start( ap, fmt );  
 
-   p->c_strlen += vsnprintf( p->c_str + p->c_strlen, 
-			     sizeof(p->c_str) - p->c_strlen,
-			     fmt, ap );
+   if (p->c_strlen < sizeof(p->c_str))
+      p->c_strlen += vsnprintf( p->c_str + p->c_strlen, 
+				sizeof(p->c_str) - p->c_strlen,
+				fmt, ap );
    
    va_end( ap );
 }
 
 static INLINE void emit_char( struct fragment_program *p, char c )
 {
-   if (p->c_strlen < sizeof(p->c_str))
+   if (p->c_strlen < sizeof(p->c_str)) {
        p->c_str[p->c_strlen] = c;
-   
-   p->c_strlen++;
+       p->c_strlen++;
+   }
 }
 
 
@@ -202,6 +203,18 @@ static void print_header( struct fragment_program *p )
 {
    emit(p, "\n\n\n");
 
+   /* Mesa's program_parameter struct:
+    */
+   emit(p, 
+	"struct program_parameter\n"
+	"{\n"
+	"   const char *Name;\n"
+	"   int Type;\n"
+	"   int StateIndexes[6];\n"
+	"   float Values[4];\n"
+	"};\n");
+
+
    /* Texture samplers, not written yet:
     */
    emit(p, "extern void TEX( void *ctx, const float *txc, int unit, float *rslt );\n"
@@ -229,10 +242,10 @@ static void print_header( struct fragment_program *p )
 
    /* Our function!
     */
-   emit(p, "void run_program( void *ctx, \n"
+   emit(p, "int run_program( void *ctx, \n"
 	  "                  const float (*local_param)[4], \n"
 	  "                  const float (*env_param)[4], \n"
-	  "                  const float (*state_param)[4], \n"
+	  "                  const struct program_parameter *state_param, \n"
 	  "                  const float (*interp)[4], \n"
 	  "                  float (*outputs)[4])\n"
 	  "{\n"
@@ -242,6 +255,7 @@ static void print_header( struct fragment_program *p )
 
 static void print_footer( struct fragment_program *p )
 {
+   emit(p, "   return 1;");
    emit(p, "}\n");
 }
 
@@ -279,11 +293,15 @@ static void print_reg( struct fragment_program *p,
    case UREG_TYPE_INTERP: emit(p, "interp"); break;
    case UREG_TYPE_LOCAL_CONST: emit(p, "local_const"); break;
    case UREG_TYPE_ENV_CONST: emit(p, "env_const"); break;
-   case UREG_TYPE_STATE_CONST: emit(p, "state_const"); break;
+   case UREG_TYPE_STATE_CONST: emit(p, "state_param"); break;
    case UREG_TYPE_PARAM: emit(p, "param"); break;
    };
    
    emit(p, "[%d]", GET_UREG_NR(arg));
+
+   if (GET_UREG_TYPE(arg) == UREG_TYPE_STATE_CONST) {
+      emit(p, ".Values");
+   }
 }
 
 
@@ -305,7 +323,8 @@ static void print_arg( struct fragment_program *p,
       return;
    }
 
-   if (GET_UREG_TYPE(arg) == UREG_TYPE_STATE_CONST) {
+   if (GET_UREG_TYPE(arg) == UREG_TYPE_STATE_CONST &&
+       p->Parameters->Parameters[GET_UREG_NR(arg)].Type == CONSTANT) {
       emit(p, "%g", p->Parameters->Parameters[GET_UREG_NR(arg)].Values[src]);
       return;
    }
@@ -347,6 +366,26 @@ static void print_expression( struct fragment_program *p,
    emit(p, ";\n");
 }
 
+static void do_tex_kill( struct fragment_program *p,
+			 const struct fp_instruction *inst,
+			 GLuint arg )
+{
+   GLuint i;
+
+   emit(p, "if (");
+
+   for (i = 0; i < 4; i++) {
+      print_arg( p, deref(arg, i) );
+      emit(p, " < 0 ");
+      if (i + 1 < 4)
+	 emit(p, "|| ");
+   }
+
+   emit(p, ")\n");
+   emit(p, "           return 0;\n");
+
+}
+
 static void do_tex_simple( struct fragment_program *p,
 			   const struct fp_instruction *inst,
 			   const char *fn, GLuint texunit, GLuint arg )
@@ -641,7 +680,7 @@ static void translate_program( struct fragment_program *p )
 	 break;
 
       case FP_OPCODE_KIL:
-	 /* TODO */
+	 do_tex_kill(p, inst, src[0]);
 	 break;
 
       case FP_OPCODE_LG2: 
@@ -774,10 +813,6 @@ void _swrast_translate_program( GLcontext *ctx )
       print_header( p );
       translate_program( p );
       print_footer( p );
-      emit_char(p, 0);
-      
-      printf("C program length: %d/%d chars\n", p->c_strlen, strlen(p->c_str));
-      printf(p->c_str);
    }
 }
 
diff --git a/src/mesa/swrast/s_nvfragprog.c b/src/mesa/swrast/s_nvfragprog.c
index 036c1870d1..f7510bf3dd 100644
--- a/src/mesa/swrast/s_nvfragprog.c
+++ b/src/mesa/swrast/s_nvfragprog.c
@@ -1357,10 +1357,18 @@ _swrast_exec_fragment_program( GLcontext *ctx, struct sw_span *span )
          init_machine(ctx, &ctx->FragmentProgram.Machine,
                       ctx->FragmentProgram.Current, span, i);
 
+#ifdef USE_TCC
+         if (!_swrast_execute_codegen_program(ctx, program, ~0,
+					      &ctx->FragmentProgram.Machine,
+					      span, i)) {
+            span->array->mask[i] = GL_FALSE;  /* killed fragment */
+         }
+#else
          if (!execute_program(ctx, program, ~0,
                               &ctx->FragmentProgram.Machine, span, i)) {
             span->array->mask[i] = GL_FALSE;  /* killed fragment */
          }
+#endif
 
          /* Store output registers */
          {
diff --git a/src/mesa/swrast/s_tcc.c b/src/mesa/swrast/s_tcc.c
new file mode 100644
index 0000000000..3d8f550ece
--- /dev/null
+++ b/src/mesa/swrast/s_tcc.c
@@ -0,0 +1,185 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.1
+ *
+ * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* An attempt to hook s_fragprog_to_c.c up to libtcc.a to try &
+ * generate some real code.
+ *
+ * TCC isn't threadsafe, so it will need additional locking help if we
+ * end up using it as a backend in mesa.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+
+#include "glheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "nvfragprog.h"
+#include "macros.h"
+#include "program.h"
+
+#include "s_nvfragprog.h"
+#include "s_texture.h"
+
+#ifdef USE_TCC
+
+#include <libtcc.h>
+
+typedef int (*cfunc)( void *ctx, 
+		      const GLfloat (*local_param)[4], 
+		      const GLfloat (*env_param)[4], 
+		      const struct program_parameter *state_param, 
+		      const GLfloat (*interp)[4], 
+		      GLfloat (*outputs)[4]);
+
+
+static cfunc current_func;
+static struct fragment_program *current_program;
+static TCCState *current_tcc_state;
+
+
+static void TEX( void *cc, const float *texcoord, int unit, float *result )
+{
+   GLcontext *ctx = (GLcontext *)cc;
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLfloat lambda = 1.0;	/* hack */
+   GLchan rgba[4];
+
+   swrast->TextureSample[unit](ctx, unit, ctx->Texture.Unit[unit]._Current,
+                               1, (const GLfloat (*)[4]) texcoord,
+                               &lambda, &rgba);
+
+   result[0] = CHAN_TO_FLOAT(rgba[0]);
+   result[1] = CHAN_TO_FLOAT(rgba[1]);
+   result[2] = CHAN_TO_FLOAT(rgba[2]);
+   result[3] = CHAN_TO_FLOAT(rgba[3]);
+}
+
+
+static void TXB( void *cc, const float *texcoord, int unit, float *result )
+{
+   GLcontext *ctx = (GLcontext *)cc;
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   GLfloat lambda = 1.0;	/* hack */
+   GLchan rgba[4];
+
+   /* texcoord[3] is the bias to add to lambda */
+   lambda += texcoord[3];
+
+
+   /* Is it necessary to reset texcoord[3] to 1 at this point?
+    */
+   swrast->TextureSample[unit](ctx, unit, ctx->Texture.Unit[unit]._Current,
+                               1, (const GLfloat (*)[4]) texcoord,
+                               &lambda, &rgba);
+
+   result[0] = CHAN_TO_FLOAT(rgba[0]);
+   result[1] = CHAN_TO_FLOAT(rgba[1]);
+   result[2] = CHAN_TO_FLOAT(rgba[2]);
+   result[3] = CHAN_TO_FLOAT(rgba[3]);
+}
+
+
+static void TXP( void *cc, const float *texcoord, int unit, float *result )
+{
+   /* I think that TEX needs to undo the perspective divide which has
+    * already occurred.  In the meantime, TXP is correct to do this:
+    */
+   TEX( cc, texcoord, unit, result );
+}
+
+
+static cfunc codegen( TCCState *s, const char *prog, const char *fname )
+{
+    unsigned long val;
+
+    if (s) 
+       tcc_delete(s);
+    
+    s = tcc_new();
+    if (!s) 
+       return 0;
+
+    tcc_set_output_type(s, TCC_OUTPUT_MEMORY);
+    tcc_compile_string(s, prog);
+
+/*     tcc_add_dll("/usr/lib/libm.so"); */
+
+    tcc_add_symbol(s, "TEX", (unsigned long)&TEX);
+    tcc_add_symbol(s, "TXB", (unsigned long)&TXB);
+    tcc_add_symbol(s, "TXP", (unsigned long)&TXP);
+
+
+    tcc_relocate(s);
+    tcc_get_symbol(s, &val, fname);
+    return (cfunc) val;
+}
+
+/* TCC isn't threadsafe and even seems not to like having more than
+ * one TCCState created or used at any one time in a single threaded
+ * environment.  So, this code is all for investigation only and can't
+ * currently be used in Mesa proper.
+ *
+ * I've taken some liberties with globals myself, now.
+ */
+GLboolean
+_swrast_execute_codegen_program( GLcontext *ctx,
+			 const struct fragment_program *program, GLuint maxInst,
+			 struct fp_machine *machine, const struct sw_span *span,
+			 GLuint column )
+{
+   if (program != current_program) {
+      
+      _swrast_translate_program( ctx );
+
+      fprintf(stderr, "%s: compiling:\n%s\n", __FUNCTION__, program->c_str);
+
+      current_program = program;
+      current_func = codegen( current_tcc_state, program->c_str, 
+			      "run_program" );
+   }
+
+   assert(current_func);
+
+   return current_func( ctx,
+			program->Base.LocalParams,
+ 			(const GLfloat (*)[4])ctx->FragmentProgram.Parameters, 
+			program->Parameters->Parameters,
+			(const GLfloat (*)[4])machine->Inputs,
+			machine->Outputs );
+}
+
+#else  /* USE_TCC */
+
+GLboolean
+_swrast_execute_codegen_program( GLcontext *ctx,
+			 const struct fragment_program *program, GLuint maxInst,
+			 struct fp_machine *machine, const struct sw_span *span,
+			 GLuint column )
+{
+   return 0;
+}
+
+#endif