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foxbox/apps/plugins/sdl/progs/quake/pr_exec.c
Franklin Wei 5d05b9d3e9 Quake! 
This ports id Software's Quake to run on the SDL plugin runtime. The
source code originated from id under the GPLv2 license. I used
https://github.com/ahefner/sdlquake as the base of my port.

Performance is, unsurprisingly, not on par with what you're probably
used to on PC. I average about 10FPS on ipod6g, but it's still
playable.

Sound works well enough, but in-game music is not supported. I've
written ARM assembly routines for the inner sound loop. Make sure you
turn the "brightness" all the way down, or colors will look funky.

To run, extract Quake's data files to /.rockbox/quake. Have fun!

Change-Id: I4285036e967d7f0722802d43cf2096c808ca5799
2019-07-19 22:37:40 -04:00

668 lines
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/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.h"
/*
*/
typedef struct
{
int s;
dfunction_t *f;
} prstack_t;
#define MAX_STACK_DEPTH 32
prstack_t pr_stack[MAX_STACK_DEPTH];
int pr_depth;
#define LOCALSTACK_SIZE 2048
int localstack[LOCALSTACK_SIZE];
int localstack_used;
qboolean pr_trace;
dfunction_t *pr_xfunction;
int pr_xstatement;
int pr_argc;
char *pr_opnames[] =
{
"DONE",
"MUL_F",
"MUL_V",
"MUL_FV",
"MUL_VF",
"DIV",
"ADD_F",
"ADD_V",
"SUB_F",
"SUB_V",
"EQ_F",
"EQ_V",
"EQ_S",
"EQ_E",
"EQ_FNC",
"NE_F",
"NE_V",
"NE_S",
"NE_E",
"NE_FNC",
"LE",
"GE",
"LT",
"GT",
"INDIRECT",
"INDIRECT",
"INDIRECT",
"INDIRECT",
"INDIRECT",
"INDIRECT",
"ADDRESS",
"STORE_F",
"STORE_V",
"STORE_S",
"STORE_ENT",
"STORE_FLD",
"STORE_FNC",
"STOREP_F",
"STOREP_V",
"STOREP_S",
"STOREP_ENT",
"STOREP_FLD",
"STOREP_FNC",
"RETURN",
"NOT_F",
"NOT_V",
"NOT_S",
"NOT_ENT",
"NOT_FNC",
"IF",
"IFNOT",
"CALL0",
"CALL1",
"CALL2",
"CALL3",
"CALL4",
"CALL5",
"CALL6",
"CALL7",
"CALL8",
"STATE",
"GOTO",
"AND",
"OR",
"BITAND",
"BITOR"
};
char *PR_GlobalString (int ofs);
char *PR_GlobalStringNoContents (int ofs);
//=============================================================================
/*
=================
PR_PrintStatement
=================
*/
void PR_PrintStatement (dstatement_t *s)
{
int i;
if ( (unsigned)s->op < sizeof(pr_opnames)/sizeof(pr_opnames[0]))
{
Con_Printf ("%s ", pr_opnames[s->op]);
i = strlen(pr_opnames[s->op]);
for ( ; i<10 ; i++)
Con_Printf (" ");
}
if (s->op == OP_IF || s->op == OP_IFNOT)
Con_Printf ("%sbranch %i",PR_GlobalString(s->a),s->b);
else if (s->op == OP_GOTO)
{
Con_Printf ("branch %i",s->a);
}
else if ( (unsigned)(s->op - OP_STORE_F) < 6)
{
Con_Printf ("%s",PR_GlobalString(s->a));
Con_Printf ("%s", PR_GlobalStringNoContents(s->b));
}
else
{
if (s->a)
Con_Printf ("%s",PR_GlobalString(s->a));
if (s->b)
Con_Printf ("%s",PR_GlobalString(s->b));
if (s->c)
Con_Printf ("%s", PR_GlobalStringNoContents(s->c));
}
Con_Printf ("\n");
}
/*
============
PR_StackTrace
============
*/
void PR_StackTrace (void)
{
dfunction_t *f;
int i;
if (pr_depth == 0)
{
Con_Printf ("<NO STACK>\n");
return;
}
pr_stack[pr_depth].f = pr_xfunction;
for (i=pr_depth ; i>=0 ; i--)
{
f = pr_stack[i].f;
if (!f)
{
Con_Printf ("<NO FUNCTION>\n");
}
else
Con_Printf ("%12s : %s\n", pr_strings + f->s_file, pr_strings + f->s_name);
}
}
/*
============
PR_Profile_f
============
*/
void PR_Profile_f (void)
{
dfunction_t *f, *best;
int max;
int num;
int i;
num = 0;
do
{
max = 0;
best = NULL;
for (i=0 ; i<progs->numfunctions ; i++)
{
f = &pr_functions[i];
if (f->profile > max)
{
max = f->profile;
best = f;
}
}
if (best)
{
if (num < 10)
Con_Printf ("%7i %s\n", best->profile, pr_strings+best->s_name);
num++;
best->profile = 0;
}
} while (best);
}
/*
============
PR_RunError
Aborts the currently executing function
============
*/
void PR_RunError (char *error, ...)
{
va_list argptr;
char string[1024];
va_start (argptr,error);
vsprintf (string,error,argptr);
va_end (argptr);
PR_PrintStatement (pr_statements + pr_xstatement);
PR_StackTrace ();
Con_Printf ("%s\n", string);
pr_depth = 0; // dump the stack so host_error can shutdown functions
Host_Error ("Program error");
}
/*
============================================================================
PR_ExecuteProgram
The interpretation main loop
============================================================================
*/
/*
====================
PR_EnterFunction
Returns the new program statement counter
====================
*/
int PR_EnterFunction (dfunction_t *f)
{
int i, j, c, o;
pr_stack[pr_depth].s = pr_xstatement;
pr_stack[pr_depth].f = pr_xfunction;
pr_depth++;
if (pr_depth >= MAX_STACK_DEPTH)
PR_RunError ("stack overflow");
// save off any locals that the new function steps on
c = f->locals;
if (localstack_used + c > LOCALSTACK_SIZE)
PR_RunError ("PR_ExecuteProgram: locals stack overflow\n");
for (i=0 ; i < c ; i++)
localstack[localstack_used+i] = ((int *)pr_globals)[f->parm_start + i];
localstack_used += c;
// copy parameters
o = f->parm_start;
for (i=0 ; i<f->numparms ; i++)
{
for (j=0 ; j<f->parm_size[i] ; j++)
{
((int *)pr_globals)[o] = ((int *)pr_globals)[OFS_PARM0+i*3+j];
o++;
}
}
pr_xfunction = f;
return f->first_statement - 1; // offset the s++
}
/*
====================
PR_LeaveFunction
====================
*/
int PR_LeaveFunction (void)
{
int i, c;
if (pr_depth <= 0)
Sys_Error ("prog stack underflow");
// restore locals from the stack
c = pr_xfunction->locals;
localstack_used -= c;
if (localstack_used < 0)
PR_RunError ("PR_ExecuteProgram: locals stack underflow\n");
for (i=0 ; i < c ; i++)
((int *)pr_globals)[pr_xfunction->parm_start + i] = localstack[localstack_used+i];
// up stack
pr_depth--;
pr_xfunction = pr_stack[pr_depth].f;
return pr_stack[pr_depth].s;
}
/*
====================
PR_ExecuteProgram
====================
*/
void PR_ExecuteProgram (func_t fnum)
{
eval_t *a, *b, *c;
int s;
dstatement_t *st;
dfunction_t *f, *newf;
int runaway;
int i;
edict_t *ed;
int exitdepth;
eval_t *ptr;
if (!fnum || fnum >= progs->numfunctions)
{
if (pr_global_struct->self)
ED_Print (PROG_TO_EDICT(pr_global_struct->self));
Host_Error ("PR_ExecuteProgram: NULL function");
}
f = &pr_functions[fnum];
runaway = 100000;
pr_trace = false;
// make a stack frame
exitdepth = pr_depth;
s = PR_EnterFunction (f);
while (1)
{
s++; // next statement
st = &pr_statements[s];
a = (eval_t *)&pr_globals[st->a];
b = (eval_t *)&pr_globals[st->b];
c = (eval_t *)&pr_globals[st->c];
if (!--runaway)
PR_RunError ("runaway loop error");
pr_xfunction->profile++;
pr_xstatement = s;
if (pr_trace)
PR_PrintStatement (st);
switch (st->op)
{
case OP_ADD_F:
c->_float = a->_float + b->_float;
break;
case OP_ADD_V:
c->vector[0] = a->vector[0] + b->vector[0];
c->vector[1] = a->vector[1] + b->vector[1];
c->vector[2] = a->vector[2] + b->vector[2];
break;
case OP_SUB_F:
c->_float = a->_float - b->_float;
break;
case OP_SUB_V:
c->vector[0] = a->vector[0] - b->vector[0];
c->vector[1] = a->vector[1] - b->vector[1];
c->vector[2] = a->vector[2] - b->vector[2];
break;
case OP_MUL_F:
c->_float = a->_float * b->_float;
break;
case OP_MUL_V:
c->_float = a->vector[0]*b->vector[0]
+ a->vector[1]*b->vector[1]
+ a->vector[2]*b->vector[2];
break;
case OP_MUL_FV:
c->vector[0] = a->_float * b->vector[0];
c->vector[1] = a->_float * b->vector[1];
c->vector[2] = a->_float * b->vector[2];
break;
case OP_MUL_VF:
c->vector[0] = b->_float * a->vector[0];
c->vector[1] = b->_float * a->vector[1];
c->vector[2] = b->_float * a->vector[2];
break;
case OP_DIV_F:
c->_float = a->_float / b->_float;
break;
case OP_BITAND:
c->_float = (int)a->_float & (int)b->_float;
break;
case OP_BITOR:
c->_float = (int)a->_float | (int)b->_float;
break;
case OP_GE:
c->_float = a->_float >= b->_float;
break;
case OP_LE:
c->_float = a->_float <= b->_float;
break;
case OP_GT:
c->_float = a->_float > b->_float;
break;
case OP_LT:
c->_float = a->_float < b->_float;
break;
case OP_AND:
c->_float = a->_float && b->_float;
break;
case OP_OR:
c->_float = a->_float || b->_float;
break;
case OP_NOT_F:
c->_float = !a->_float;
break;
case OP_NOT_V:
c->_float = !a->vector[0] && !a->vector[1] && !a->vector[2];
break;
case OP_NOT_S:
c->_float = !a->string || !pr_strings[a->string];
break;
case OP_NOT_FNC:
c->_float = !a->function;
break;
case OP_NOT_ENT:
c->_float = (PROG_TO_EDICT(a->edict) == sv.edicts);
break;
case OP_EQ_F:
c->_float = a->_float == b->_float;
break;
case OP_EQ_V:
c->_float = (a->vector[0] == b->vector[0]) &&
(a->vector[1] == b->vector[1]) &&
(a->vector[2] == b->vector[2]);
break;
case OP_EQ_S:
c->_float = !strcmp(pr_strings+a->string,pr_strings+b->string);
break;
case OP_EQ_E:
c->_float = a->_int == b->_int;
break;
case OP_EQ_FNC:
c->_float = a->function == b->function;
break;
case OP_NE_F:
c->_float = a->_float != b->_float;
break;
case OP_NE_V:
c->_float = (a->vector[0] != b->vector[0]) ||
(a->vector[1] != b->vector[1]) ||
(a->vector[2] != b->vector[2]);
break;
case OP_NE_S:
c->_float = strcmp(pr_strings+a->string,pr_strings+b->string);
break;
case OP_NE_E:
c->_float = a->_int != b->_int;
break;
case OP_NE_FNC:
c->_float = a->function != b->function;
break;
//==================
case OP_STORE_F:
case OP_STORE_ENT:
case OP_STORE_FLD: // integers
case OP_STORE_S:
case OP_STORE_FNC: // pointers
b->_int = a->_int;
break;
case OP_STORE_V:
b->vector[0] = a->vector[0];
b->vector[1] = a->vector[1];
b->vector[2] = a->vector[2];
break;
case OP_STOREP_F:
case OP_STOREP_ENT:
case OP_STOREP_FLD: // integers
case OP_STOREP_S:
case OP_STOREP_FNC: // pointers
ptr = (eval_t *)((byte *)sv.edicts + b->_int);
ptr->_int = a->_int;
break;
case OP_STOREP_V:
ptr = (eval_t *)((byte *)sv.edicts + b->_int);
ptr->vector[0] = a->vector[0];
ptr->vector[1] = a->vector[1];
ptr->vector[2] = a->vector[2];
break;
case OP_ADDRESS:
ed = PROG_TO_EDICT(a->edict);
#ifdef PARANOID
NUM_FOR_EDICT(ed); // make sure it's in range
#endif
if (ed == (edict_t *)sv.edicts && sv.state == ss_active)
PR_RunError ("assignment to world entity");
c->_int = (byte *)((int *)&ed->v + b->_int) - (byte *)sv.edicts;
break;
case OP_LOAD_F:
case OP_LOAD_FLD:
case OP_LOAD_ENT:
case OP_LOAD_S:
case OP_LOAD_FNC:
ed = PROG_TO_EDICT(a->edict);
#ifdef PARANOID
NUM_FOR_EDICT(ed); // make sure it's in range
#endif
a = (eval_t *)((int *)&ed->v + b->_int);
c->_int = a->_int;
break;
case OP_LOAD_V:
ed = PROG_TO_EDICT(a->edict);
#ifdef PARANOID
NUM_FOR_EDICT(ed); // make sure it's in range
#endif
a = (eval_t *)((int *)&ed->v + b->_int);
c->vector[0] = a->vector[0];
c->vector[1] = a->vector[1];
c->vector[2] = a->vector[2];
break;
//==================
case OP_IFNOT:
if (!a->_int)
s += st->b - 1; // offset the s++
break;
case OP_IF:
if (a->_int)
s += st->b - 1; // offset the s++
break;
case OP_GOTO:
s += st->a - 1; // offset the s++
break;
case OP_CALL0:
case OP_CALL1:
case OP_CALL2:
case OP_CALL3:
case OP_CALL4:
case OP_CALL5:
case OP_CALL6:
case OP_CALL7:
case OP_CALL8:
pr_argc = st->op - OP_CALL0;
if (!a->function)
PR_RunError ("NULL function");
newf = &pr_functions[a->function];
if (newf->first_statement < 0)
{ // negative statements are built in functions
i = -newf->first_statement;
if (i >= pr_numbuiltins)
PR_RunError ("Bad builtin call number");
pr_builtins[i] ();
break;
}
s = PR_EnterFunction (newf);
break;
case OP_DONE:
case OP_RETURN:
pr_globals[OFS_RETURN] = pr_globals[st->a];
pr_globals[OFS_RETURN+1] = pr_globals[st->a+1];
pr_globals[OFS_RETURN+2] = pr_globals[st->a+2];
s = PR_LeaveFunction ();
if (pr_depth == exitdepth)
return; // all done
break;
case OP_STATE:
ed = PROG_TO_EDICT(pr_global_struct->self);
#ifdef FPS_20
ed->v.nextthink = pr_global_struct->time + 0.05;
#else
ed->v.nextthink = pr_global_struct->time + 0.1;
#endif
if (a->_float != ed->v.frame)
{
ed->v.frame = a->_float;
}
ed->v.think = b->function;
break;
default:
PR_RunError ("Bad opcode %i", st->op);
}
}
}
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