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/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2005 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 "glheader.h"
#include "imports.h"
#include "colormac.h"
#include "context.h"
#include "nvfragprog.h"
#include "macros.h"
#include "program.h"
#include "s_nvfragprog.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, 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, 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 )
{
(void) ctx;
(void) program; (void) maxInst;
(void) machine; (void) span;
(void) column;
return 0;
}
#endif
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