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mojoshader_assembler.c
1822 lines (1526 loc) · 52.4 KB
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mojoshader_assembler.c
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/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
// !!! FIXME: this should probably use a formal grammar and not a hand-written
// !!! FIXME: pile of C code.
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
#if DEBUG_ASSEMBLER_PARSER
#define print_debug_token(token, len, val) \
MOJOSHADER_print_debug_token("ASSEMBLER", token, len, val)
#else
#define print_debug_token(token, len, val)
#endif
typedef struct SourcePos
{
const char *filename;
uint32 line;
} SourcePos;
// Context...this is state that changes as we assemble a shader...
typedef struct Context
{
int isfail;
int out_of_memory;
MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
void *malloc_data;
int error_count;
ErrorList *errors;
Preprocessor *preprocessor;
MOJOSHADER_parsePhase parse_phase;
MOJOSHADER_shaderType shader_type;
uint8 major_ver;
uint8 minor_ver;
int pushedback;
const char *token; // assembler token!
unsigned int tokenlen; // assembler token!
Token tokenval; // assembler token!
uint32 version_token; // bytecode token!
uint32 tokenbuf[16]; // bytecode tokens!
int tokenbufpos; // bytecode tokens!
DestArgInfo dest_arg;
uint32 *output;
SourcePos *token_to_source;
uint8 *ctab;
uint32 ctab_len;
uint32 ctab_allocation;
size_t output_len;
size_t output_allocation;
} Context;
// Convenience functions for allocators...
static inline void out_of_memory(Context *ctx)
{
ctx->isfail = ctx->out_of_memory = 1;
} // out_of_memory
static inline void *Malloc(Context *ctx, const size_t len)
{
void *retval = ctx->malloc((int) len, ctx->malloc_data);
if (retval == NULL)
out_of_memory(ctx);
return retval;
} // Malloc
static inline char *StrDup(Context *ctx, const char *str)
{
char *retval = (char *) Malloc(ctx, strlen(str) + 1);
if (retval != NULL)
strcpy(retval, str);
return retval;
} // StrDup
static inline void Free(Context *ctx, void *ptr)
{
if (ptr != NULL) // check for NULL in case of dumb free() impl.
ctx->free(ptr, ctx->malloc_data);
} // Free
static void failf(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static void failf(Context *ctx, const char *fmt, ...)
{
const char *fname = NULL;
unsigned int linenum = 0;
int error_position = 0;
ctx->isfail = 1;
switch (ctx->parse_phase)
{
case MOJOSHADER_PARSEPHASE_NOTSTARTED:
error_position = -2;
break;
case MOJOSHADER_PARSEPHASE_WORKING:
fname = preprocessor_sourcepos(ctx->preprocessor, &linenum);
error_position = (int) linenum;
break;
case MOJOSHADER_PARSEPHASE_DONE:
error_position = -1;
break;
default:
assert(0 && "Unexpected value");
return;
} // switch
ErrorList *error = (ErrorList *) Malloc(ctx, sizeof (ErrorList));
if (error == NULL)
return;
char scratch = 0;
va_list ap;
va_start(ap, fmt);
const int len = vsnprintf(&scratch, sizeof (scratch), fmt, ap);
va_end(ap);
char *failstr = (char *) Malloc(ctx, len + 1);
if (failstr == NULL)
Free(ctx, error);
else
{
va_start(ap, fmt);
vsnprintf(failstr, len + 1, fmt, ap); // rebuild it.
va_end(ap);
error->error.error = failstr;
error->error.filename = fname ? StrDup(ctx, fname) : NULL;
error->error.error_position = error_position;
error->next = NULL;
ErrorList *prev = NULL;
ErrorList *item = ctx->errors;
while (item != NULL)
{
prev = item;
item = item->next;
} // while
if (prev == NULL)
ctx->errors = error;
else
prev->next = error;
ctx->error_count++;
} // else
} // failf
static inline void fail(Context *ctx, const char *reason)
{
failf(ctx, "%s", reason);
} // fail
static inline int isfail(const Context *ctx)
{
return ctx->isfail;
} // isfail
// Shader model version magic...
static inline uint32 ver_ui32(const uint8 major, const uint8 minor)
{
return ( (((uint32) major) << 16) | (((minor) == 0xFF) ? 0 : (minor)) );
} // version_ui32
static inline int shader_version_atleast(const Context *ctx, const uint8 maj,
const uint8 min)
{
return (ver_ui32(ctx->major_ver, ctx->minor_ver) >= ver_ui32(maj, min));
} // shader_version_atleast
static inline int shader_is_pixel(const Context *ctx)
{
return (ctx->shader_type == MOJOSHADER_TYPE_PIXEL);
} // shader_is_pixel
static inline int shader_is_vertex(const Context *ctx)
{
return (ctx->shader_type == MOJOSHADER_TYPE_VERTEX);
} // shader_is_vertex
static inline void pushback(Context *ctx)
{
#if DEBUG_ASSEMBLER_PARSER
printf("ASSEMBLER PUSHBACK\n");
#endif
assert(!ctx->pushedback);
ctx->pushedback = 1;
} // pushback
static Token nexttoken(Context *ctx)
{
if (ctx->pushedback)
ctx->pushedback = 0;
else
{
while (1)
{
ctx->token = preprocessor_nexttoken(ctx->preprocessor,
&ctx->tokenlen,
&ctx->tokenval);
if (preprocessor_outofmemory(ctx->preprocessor))
{
out_of_memory(ctx);
ctx->tokenval = TOKEN_EOI;
ctx->token = NULL;
ctx->tokenlen = 0;
break;
} // if
else if (ctx->tokenval == TOKEN_PREPROCESSING_ERROR)
{
fail(ctx, ctx->token);
continue;
} // else if
break;
} // while
} // else
print_debug_token(ctx->token, ctx->tokenlen, ctx->tokenval);
return ctx->tokenval;
} // nexttoken
static inline void add_token_sourcepos(Context *ctx, const size_t idx)
{
unsigned int pos = 0;
const char *fname = preprocessor_sourcepos(ctx->preprocessor, &pos);
ctx->token_to_source[idx].line = pos;
ctx->token_to_source[idx].filename = fname; // cached in preprocessor!
} // add_token_sourcepos
static void output_token_noswap(Context *ctx, const uint32 token)
{
if (isfail(ctx))
return;
if (ctx->output_len >= ctx->output_allocation)
{
const size_t output_alloc_bump = 1024; // that's tokens, not bytes.
const size_t newsize = ctx->output_allocation + output_alloc_bump;
void *ptr;
ptr = Malloc(ctx, newsize * sizeof (uint32));
if (ptr == NULL)
return;
if (ctx->output_len > 0)
memcpy(ptr, ctx->output, ctx->output_len * sizeof (uint32));
Free(ctx, ctx->output);
ctx->output = (uint32 *) ptr;
ptr = Malloc(ctx, newsize * sizeof (SourcePos));
if (ptr == NULL)
return;
if (ctx->output_len > 0)
memcpy(ptr, ctx->token_to_source, ctx->output_len * sizeof (SourcePos));
Free(ctx, ctx->token_to_source);
ctx->token_to_source = (SourcePos *) ptr;
ctx->output_allocation = newsize;
} // if
ctx->output[ctx->output_len] = token;
add_token_sourcepos(ctx, ctx->output_len);
ctx->output_len++;
} // output_token_noswap
static inline void output_token(Context *ctx, const uint32 token)
{
output_token_noswap(ctx, SWAP32(token));
} // output_token
static void output_comment_bytes(Context *ctx, const uint8 *buf, size_t len)
{
if (len > (0xFFFF * 4)) // length is stored as token count, in 16 bits.
fail(ctx, "Comment field is too big");
else if (!isfail(ctx))
{
const uint32 tokencount = (len / 4) + ((len % 4) ? 1 : 0);
output_token(ctx, 0xFFFE | (tokencount << 16));
while (len >= 4)
{
output_token_noswap(ctx, *((const uint32 *) buf));
len -= 4;
buf += 4;
} // while
if (len > 0) // handle spillover...
{
union { uint8 ui8[4]; uint32 ui32; } overflow;
overflow.ui32 = 0;
memcpy(overflow.ui8, buf, len);
output_token_noswap(ctx, overflow.ui32);
} // if
} // else if
} // output_comment_bytes
static inline void output_comment_string(Context *ctx, const char *str)
{
output_comment_bytes(ctx, (const uint8 *) str, strlen(str));
} // output_comment_string
static int require_comma(Context *ctx)
{
const Token token = nexttoken(ctx);
if (token != ((Token) ','))
{
fail(ctx, "Comma expected");
return 0;
} // if
return 1;
} // require_comma
static int check_token_segment(Context *ctx, const char *str)
{
// !!! FIXME: these are case-insensitive, right?
const size_t len = strlen(str);
if ( (ctx->tokenlen < len) || (strncasecmp(ctx->token, str, len) != 0) )
return 0;
ctx->token += len;
ctx->tokenlen -= len;
return 1;
} // check_token_segment
static int check_token(Context *ctx, const char *str)
{
const size_t len = strlen(str);
if ( (ctx->tokenlen != len) || (strncasecmp(ctx->token, str, len) != 0) )
return 0;
ctx->token += len;
ctx->tokenlen = 0;
return 1;
} // check_token
static int ui32fromtoken(Context *ctx, uint32 *_val)
{
unsigned int i;
for (i = 0; i < ctx->tokenlen; i++)
{
if ((ctx->token[i] < '0') || (ctx->token[i] > '9'))
break;
} // for
if (i == 0)
{
*_val = 0;
return 0;
} // if
const unsigned int len = i;
uint32 val = 0;
uint32 mult = 1;
while (i--)
{
val += ((uint32) (ctx->token[i] - '0')) * mult;
mult *= 10;
} // while
ctx->token += len;
ctx->tokenlen -= len;
*_val = val;
return 1;
} // ui32fromtoken
static int parse_register_name(Context *ctx, RegisterType *rtype, int *rnum)
{
if (nexttoken(ctx) != TOKEN_IDENTIFIER)
{
fail(ctx, "Expected register");
return 0;
} // if
int neednum = 1;
int regnum = 0;
RegisterType regtype = REG_TYPE_TEMP;
// Watch out for substrings! oDepth must be checked before oD, since
// the latter will match either case.
if (check_token_segment(ctx, "oDepth"))
{
regtype = REG_TYPE_DEPTHOUT;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "vFace"))
{
regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_FACE;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "vPos"))
{
regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_POSITION;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "oPos"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POSITION;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "oFog"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_FOG;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "oPts"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POINT_SIZE;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "aL"))
{
regtype = REG_TYPE_LOOP;
neednum = 0;
} // else if
else if (check_token_segment(ctx, "oC"))
regtype = REG_TYPE_COLOROUT;
else if (check_token_segment(ctx, "oT"))
regtype = REG_TYPE_OUTPUT;
else if (check_token_segment(ctx, "oD"))
regtype = REG_TYPE_ATTROUT;
else if (check_token_segment(ctx, "r"))
regtype = REG_TYPE_TEMP;
else if (check_token_segment(ctx, "v"))
regtype = REG_TYPE_INPUT;
else if (check_token_segment(ctx, "c"))
regtype = REG_TYPE_CONST;
else if (check_token_segment(ctx, "i"))
regtype = REG_TYPE_CONSTINT;
else if (check_token_segment(ctx, "b"))
regtype = REG_TYPE_CONSTBOOL;
else if (check_token_segment(ctx, "s"))
regtype = REG_TYPE_SAMPLER;
else if (check_token_segment(ctx, "l"))
regtype = REG_TYPE_LABEL;
else if (check_token_segment(ctx, "p"))
regtype = REG_TYPE_PREDICATE;
else if (check_token_segment(ctx, "o"))
regtype = REG_TYPE_OUTPUT;
else if (check_token_segment(ctx, "a"))
regtype = REG_TYPE_ADDRESS;
else if (check_token_segment(ctx, "t"))
regtype = REG_TYPE_ADDRESS;
//case REG_TYPE_TEMPFLOAT16: // !!! FIXME: don't know this asm string
else
{
fail(ctx, "expected register type");
regtype = REG_TYPE_CONST;
regnum = 0;
neednum = 0;
} // else
// "c[5]" is the same as "c5", so if the token is done, see if next is '['.
if ((neednum) && (ctx->tokenlen == 0))
{
if (nexttoken(ctx) == ((Token) '['))
neednum = 0; // don't need a number on register name itself.
pushback(ctx);
} // if
if (neednum)
{
uint32 ui32 = 0;
if (!ui32fromtoken(ctx, &ui32))
fail(ctx, "Invalid register index");
regnum = (int) ui32;
} // if
// split up REG_TYPE_CONST
if (regtype == REG_TYPE_CONST)
{
if (regnum < 2048)
{
regtype = REG_TYPE_CONST;
regnum -= 0;
} // if
else if (regnum < 4096)
{
regtype = REG_TYPE_CONST2;
regnum -= 2048;
} // if
else if (regnum < 6144)
{
regtype = REG_TYPE_CONST3;
regnum -= 4096;
} // if
else if (regnum < 8192)
{
regtype = REG_TYPE_CONST4;
regnum -= 6144;
} // if
else
{
fail(ctx, "Invalid const register index");
} // else
} // if
*rtype = regtype;
*rnum = regnum;
return 1;
} // parse_register_name
static void set_result_shift(Context *ctx, DestArgInfo *info, const int val)
{
if (info->result_shift != 0)
fail(ctx, "Multiple result shift modifiers");
info->result_shift = val;
} // set_result_shift
static inline int tokenbuf_overflow(Context *ctx)
{
if ( ctx->tokenbufpos >= ((int) (STATICARRAYLEN(ctx->tokenbuf))) )
{
fail(ctx, "Too many tokens");
return 1;
} // if
return 0;
} // tokenbuf_overflow
static int parse_destination_token(Context *ctx)
{
DestArgInfo *info = &ctx->dest_arg;
memset(info, '\0', sizeof (DestArgInfo));
// parse_instruction_token() sets ctx->token to the end of the instruction
// so we can see if there are destination modifiers on the instruction
// itself...
int invalid_modifier = 0;
while ((ctx->tokenlen > 0) && (!invalid_modifier))
{
if (check_token_segment(ctx, "_x2"))
set_result_shift(ctx, info, 0x1);
else if (check_token_segment(ctx, "_x4"))
set_result_shift(ctx, info, 0x2);
else if (check_token_segment(ctx, "_x8"))
set_result_shift(ctx, info, 0x3);
else if (check_token_segment(ctx, "_d8"))
set_result_shift(ctx, info, 0xD);
else if (check_token_segment(ctx, "_d4"))
set_result_shift(ctx, info, 0xE);
else if (check_token_segment(ctx, "_d2"))
set_result_shift(ctx, info, 0xF);
else if (check_token_segment(ctx, "_sat"))
info->result_mod |= MOD_SATURATE;
else if (check_token_segment(ctx, "_pp"))
info->result_mod |= MOD_PP;
else if (check_token_segment(ctx, "_centroid"))
info->result_mod |= MOD_CENTROID;
else
invalid_modifier = 1;
} // while
if (invalid_modifier)
fail(ctx, "Invalid destination modifier");
// !!! FIXME: predicates.
if (nexttoken(ctx) == ((Token) '('))
fail(ctx, "Predicates unsupported at this time"); // !!! FIXME: ...
pushback(ctx); // parse_register_name calls nexttoken().
parse_register_name(ctx, &info->regtype, &info->regnum);
// parse_register_name() can't check this: dest regs might have modifiers.
if (ctx->tokenlen > 0)
fail(ctx, "invalid register name");
// !!! FIXME: can dest registers do relative addressing?
int invalid_writemask = 0;
int implicit_writemask = 0;
if (nexttoken(ctx) != ((Token) '.'))
{
implicit_writemask = 1;
info->writemask = 0xF;
info->writemask0 = info->writemask1 = info->writemask2 = info->writemask3 = 1;
pushback(ctx); // no explicit writemask; do full mask.
} // if
// !!! FIXME: Cg generates code with oDepth.z ... this is a bug, I think.
//else if (scalar_register(ctx->shader_type, info->regtype, info->regnum))
else if ( (scalar_register(ctx->shader_type, info->regtype, info->regnum)) && (info->regtype != REG_TYPE_DEPTHOUT) )
fail(ctx, "Writemask specified for scalar register");
else if (nexttoken(ctx) != TOKEN_IDENTIFIER)
invalid_writemask = 1;
else
{
char tokenbytes[5] = { '\0', '\0', '\0', '\0', '\0' };
const unsigned int tokenlen = ctx->tokenlen;
memcpy(tokenbytes, ctx->token, ((tokenlen < 4) ? tokenlen : 4));
char *ptr = tokenbytes;
if ((*ptr == 'r') || (*ptr == 'x')) { info->writemask0 = 1; ptr++; }
if ((*ptr == 'g') || (*ptr == 'y')) { info->writemask1 = 1; ptr++; }
if ((*ptr == 'b') || (*ptr == 'z')) { info->writemask2 = 1; ptr++; }
if ((*ptr == 'a') || (*ptr == 'w')) { info->writemask3 = 1; ptr++; }
if (*ptr != '\0')
invalid_writemask = 1;
info->writemask = ( ((info->writemask0 & 0x1) << 0) |
((info->writemask1 & 0x1) << 1) |
((info->writemask2 & 0x1) << 2) |
((info->writemask3 & 0x1) << 3) );
} // else
if (invalid_writemask)
fail(ctx, "Invalid writemask");
// !!! FIXME: Cg generates code with oDepth.z ... this is a bug, I think.
if (info->regtype == REG_TYPE_DEPTHOUT)
{
if ( (!implicit_writemask) && ((info->writemask0 + info->writemask1 +
info->writemask2 + info->writemask3) > 1) )
fail(ctx, "Writemask specified for scalar register");
} // if
info->orig_writemask = info->writemask;
if (tokenbuf_overflow(ctx))
return 1;
ctx->tokenbuf[ctx->tokenbufpos++] =
( ((((uint32) 1)) << 31) |
((((uint32) info->regnum) & 0x7ff) << 0) |
((((uint32) info->relative) & 0x1) << 13) |
((((uint32) info->result_mod) & 0xF) << 20) |
((((uint32) info->result_shift) & 0xF) << 24) |
((((uint32) info->writemask) & 0xF) << 16) |
((((uint32) info->regtype) & 0x7) << 28) |
((((uint32) info->regtype) & 0x18) << 8) );
return 1;
} // parse_destination_token
static void set_source_mod(Context *ctx, const int negate,
const SourceMod norm, const SourceMod negated,
SourceMod *srcmod)
{
if ( (*srcmod != SRCMOD_NONE) || (negate && (negated == SRCMOD_NONE)) )
fail(ctx, "Incompatible source modifiers");
else
*srcmod = ((negate) ? negated : norm);
} // set_source_mod
static int parse_source_token_maybe_relative(Context *ctx, const int relok)
{
int retval = 1;
if (tokenbuf_overflow(ctx))
return 0;
// mark this now, so optional relative addressing token is placed second.
uint32 *outtoken = &ctx->tokenbuf[ctx->tokenbufpos++];
*outtoken = 0;
SourceMod srcmod = SRCMOD_NONE;
int negate = 0;
Token token = nexttoken(ctx);
if (token == ((Token) '!'))
srcmod = SRCMOD_NOT;
else if (token == ((Token) '-'))
negate = 1;
else if ( (token == TOKEN_INT_LITERAL) && (check_token(ctx, "1")) )
{
if (nexttoken(ctx) != ((Token) '-'))
fail(ctx, "Unexpected token");
else
srcmod = SRCMOD_COMPLEMENT;
} // else
else
{
pushback(ctx);
} // else
RegisterType regtype;
int regnum;
parse_register_name(ctx, ®type, ®num);
if (ctx->tokenlen == 0)
{
if (negate)
set_source_mod(ctx, negate, SRCMOD_NONE, SRCMOD_NEGATE, &srcmod);
} // if
else
{
assert(ctx->tokenlen > 0);
if (check_token_segment(ctx, "_bias"))
set_source_mod(ctx, negate, SRCMOD_BIAS, SRCMOD_BIASNEGATE, &srcmod);
else if (check_token_segment(ctx, "_bx2"))
set_source_mod(ctx, negate, SRCMOD_SIGN, SRCMOD_SIGNNEGATE, &srcmod);
else if (check_token_segment(ctx, "_x2"))
set_source_mod(ctx, negate, SRCMOD_X2, SRCMOD_X2NEGATE, &srcmod);
else if (check_token_segment(ctx, "_dz"))
set_source_mod(ctx, negate, SRCMOD_DZ, SRCMOD_NONE, &srcmod);
else if (check_token_segment(ctx, "_dw"))
set_source_mod(ctx, negate, SRCMOD_DW, SRCMOD_NONE, &srcmod);
else if (check_token_segment(ctx, "_abs"))
set_source_mod(ctx, negate, SRCMOD_ABS, SRCMOD_ABSNEGATE, &srcmod);
else
fail(ctx, "Invalid source modifier");
} // else
uint32 relative = 0;
if (nexttoken(ctx) != ((Token) '['))
pushback(ctx); // not relative addressing?
else
{
if (!relok)
fail(ctx, "Relative addressing not permitted here.");
else
retval++;
parse_source_token_maybe_relative(ctx, 0);
relative = 1;
if (nexttoken(ctx) != ((Token) '+'))
pushback(ctx);
else
{
// !!! FIXME: maybe c3[a0.x + 5] is legal and becomes c[a0.x + 8] ?
if (regnum != 0)
fail(ctx, "Relative addressing with explicit register number.");
uint32 ui32 = 0;
if ( (nexttoken(ctx) != TOKEN_INT_LITERAL) ||
(!ui32fromtoken(ctx, &ui32)) ||
(ctx->tokenlen != 0) )
{
fail(ctx, "Invalid relative addressing offset");
} // if
regnum += (int) ui32;
} // else
if (nexttoken(ctx) != ((Token) ']'))
fail(ctx, "Expected ']'");
} // else
int invalid_swizzle = 0;
uint32 swizzle = 0;
if (nexttoken(ctx) != ((Token) '.'))
{
swizzle = 0xE4; // 0xE4 == 11100100 ... 0 1 2 3. No swizzle.
pushback(ctx); // no explicit writemask; do full mask.
} // if
else if (scalar_register(ctx->shader_type, regtype, regnum))
fail(ctx, "Swizzle specified for scalar register");
else if (nexttoken(ctx) != TOKEN_IDENTIFIER)
invalid_swizzle = 1;
else
{
char tokenbytes[5] = { '\0', '\0', '\0', '\0', '\0' };
const unsigned int tokenlen = ctx->tokenlen;
memcpy(tokenbytes, ctx->token, ((tokenlen < 4) ? tokenlen : 4));
// deal with shortened form (.x = .xxxx, etc).
if (tokenlen == 1)
tokenbytes[1] = tokenbytes[2] = tokenbytes[3] = tokenbytes[0];
else if (tokenlen == 2)
tokenbytes[2] = tokenbytes[3] = tokenbytes[1];
else if (tokenlen == 3)
tokenbytes[3] = tokenbytes[2];
else if (tokenlen != 4)
invalid_swizzle = 1;
tokenbytes[4] = '\0';
uint32 val = 0;
int i;
for (i = 0; i < 4; i++)
{
const int component = (int) tokenbytes[i];
switch (component)
{
case 'r': case 'x': val = 0; break;
case 'g': case 'y': val = 1; break;
case 'b': case 'z': val = 2; break;
case 'a': case 'w': val = 3; break;
default: invalid_swizzle = 1; break;
} // switch
swizzle |= (val << (i * 2));
} // for
} // else
if (invalid_swizzle)
fail(ctx, "Invalid swizzle");
*outtoken = ( ((((uint32) 1)) << 31) |
((((uint32) regnum) & 0x7ff) << 0) |
((((uint32) relative) & 0x1) << 13) |
((((uint32) swizzle) & 0xFF) << 16) |
((((uint32) srcmod) & 0xF) << 24) |
((((uint32) regtype) & 0x7) << 28) |
((((uint32) regtype) & 0x18) << 8) );
return retval;
} // parse_source_token_maybe_relative
static inline int parse_source_token(Context *ctx)
{
return parse_source_token_maybe_relative(ctx, 1);
} // parse_source_token
static int parse_args_NULL(Context *ctx)
{
return 1;
} // parse_args_NULL
static int parse_num(Context *ctx, const int floatok, uint32 *value)
{
union { float f; int32 si32; uint32 ui32; } cvt;
int negative = 0;
Token token = nexttoken(ctx);
if (token == ((Token) '-'))
{
negative = 1;
token = nexttoken(ctx);
} // if
if (token == TOKEN_INT_LITERAL)
{
int d = 0;
sscanf(ctx->token, "%d", &d);
if (floatok)
cvt.f = (float) ((negative) ? -d : d);
else
cvt.si32 = (int32) ((negative) ? -d : d);
} // if
else if (token == TOKEN_FLOAT_LITERAL)
{
if (!floatok)
{
fail(ctx, "Expected whole number");
*value = 0;
return 0;
} // if
sscanf(ctx->token, "%f", &cvt.f);
if (negative)
cvt.f = -cvt.f;
} // if
else
{
fail(ctx, "Expected number");
*value = 0;
return 0;
} // else
*value = cvt.ui32;
return 1;
} // parse_num
static int parse_args_DEFx(Context *ctx, const int isflt)
{
parse_destination_token(ctx);
require_comma(ctx);
parse_num(ctx, isflt, &ctx->tokenbuf[ctx->tokenbufpos++]);
require_comma(ctx);
parse_num(ctx, isflt, &ctx->tokenbuf[ctx->tokenbufpos++]);
require_comma(ctx);
parse_num(ctx, isflt, &ctx->tokenbuf[ctx->tokenbufpos++]);
require_comma(ctx);
parse_num(ctx, isflt, &ctx->tokenbuf[ctx->tokenbufpos++]);
return 6;
} // parse_args_DEFx
static int parse_args_DEF(Context *ctx)
{
return parse_args_DEFx(ctx, 1);
} // parse_args_DEF
static int parse_args_DEFI(Context *ctx)
{
return parse_args_DEFx(ctx, 0);
} // parse_args_DEFI
static int parse_args_DEFB(Context *ctx)
{
parse_destination_token(ctx);
require_comma(ctx);
// !!! FIXME: do a TOKEN_TRUE and TOKEN_FALSE? Is this case-sensitive?
const Token token = nexttoken(ctx);
int bad = 0;
if (token != TOKEN_IDENTIFIER)
bad = 1;
else if (check_token_segment(ctx, "true"))
ctx->tokenbuf[ctx->tokenbufpos++] = 1;
else if (check_token_segment(ctx, "false"))
ctx->tokenbuf[ctx->tokenbufpos++] = 0;
else
bad = 1;
if (ctx->tokenlen != 0)
bad = 1;
if (bad)
fail(ctx, "Expected 'true' or 'false'");
return 3;
} // parse_args_DEFB
static int parse_dcl_usage(Context *ctx, uint32 *val, int *issampler)
{
size_t i;
static const char *samplerusagestrs[] = { "_2d", "_cube", "_volume" };
static const char *usagestrs[] = {
"_position", "_blendweight", "_blendindices", "_normal", "_psize",
"_texcoord", "_tangent", "_binormal", "_tessfactor", "_positiont",
"_color", "_fog", "_depth", "_sample"
};
for (i = 0; i < STATICARRAYLEN(usagestrs); i++)
{
if (check_token_segment(ctx, usagestrs[i]))
{
*issampler = 0;
*val = i;
return 1;
} // if
} // for
for (i = 0; i < STATICARRAYLEN(samplerusagestrs); i++)
{
if (check_token_segment(ctx, samplerusagestrs[i]))
{
*issampler = 1;
*val = i + 2;
return 1;
} // if
} // for
*issampler = 0;
*val = 0;
return 0;
} // parse_dcl_usage
static int parse_args_DCL(Context *ctx)
{
int issampler = 0;
uint32 usage = 0;
uint32 index = 0;
ctx->tokenbufpos++; // save a spot for the usage/index token.
ctx->tokenbuf[0] = 0;
// parse_instruction_token() sets ctx->token to the end of the instruction
// so we can see if there are destination modifiers on the instruction
// itself...
if (parse_dcl_usage(ctx, &usage, &issampler))
{