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mojoshader_assembler.c
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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.
*/
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
#define DEBUG_TOKENIZER 0
// !!! FIXME: no #define support yet.
typedef struct TokenizerContext
{
const char *source;
int on_endline;
unsigned int linenum;
char prevchar;
char token[64];
char pushedback;
} TokenizerContext;
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;
int eof;
MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
void *malloc_data;
int error_count;
ErrorList *errors;
TokenizerContext tctx;
MOJOSHADER_parsePhase parse_phase;
MOJOSHADER_shaderType shader_type;
uint8 major_ver;
uint8 minor_ver;
uint32 version_token;
uint32 tokenbuf[16];
int tokenbufpos;
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)
out_of_memory(ctx);
else
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:
// !!! FIXME: fname == base source file if output_pos == 0.
if (ctx->output_len > 0)
{
const size_t idx = ctx->output_len - 1;
linenum = ctx->token_to_source[idx].line;
fname = ctx->token_to_source[idx].filename;
} // if
error_position = 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 = error->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
static inline int tokeq(const TokenizerContext *tctx, const char *token)
{
return (strcasecmp(tctx->token, token) == 0);
} // tokeq
// 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 int ui32fromstr(const char *str, uint32 *ui32)
{
//*ui32 = (uint32) atoi(minstr);
char *endptr = NULL;
const long val = strtol(str, &endptr, 10);
*ui32 = (uint32) val;
return ((val >= 0) && (*str != '\0') && (*endptr == '\0'));
} // ui32fromstr
static inline void add_token_sourcepos(Context *ctx, const size_t idx)
{
ctx->token_to_source[idx].line = ctx->tctx.linenum;
ctx->token_to_source[idx].filename = NULL;
} // 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 tokenize_ctx(Context *ctx, TokenizerContext *tctx)
{
int idx = 0;
if (tctx->pushedback)
{
tctx->pushedback = 0;
return 1;
} // if
if (tctx->on_endline)
{
tctx->on_endline = 0;
tctx->linenum++; // passed a newline, update.
} // if
while (1)
{
// !!! FIXME: carefully crafted (but legal) comments can trigger this.
if (idx >= sizeof (tctx->token))
{
fail(ctx, "buffer overflow");
return 0;
} // if
char ch = *tctx->source;
if (ch == '\t')
ch = ' '; // collapse tabs into single spaces.
else if (ch == '\r')
{
if (tctx->source[1] == '\n')
continue; // ignore '\r' if this is "\r\n" ...
ch = '\n';
} // else if
if ((ch >= '0') && (ch <= '9'))
{
// starting a number, but rest of current token was not number.
if ((idx > 0) && ((tctx->prevchar < '0') || (tctx->prevchar > '9')))
{
tctx->token[idx++] = '\0';
return 1;
} // if
} // if
else
{
// starting a non-number, but rest of current token was numbers.
if ((idx > 0) && ((tctx->prevchar >= '0') && (tctx->prevchar <= '9')))
{
tctx->token[idx++] = '\0';
return 1;
} // if
} // else
switch (ch)
{
case '/':
case ';': // !!! FIXME: comment, right?
if (idx != 0) // finish off existing token.
tctx->token[idx] = '\0';
else
{
tctx->token[idx++] = ch;
tctx->source++;
if ((ch == '/') && (*tctx->source == '/'))
{
tctx->token[idx++] = '/';
tctx->source++;
} // if
tctx->token[idx++] = '\0';
} // else
return 1;
case ' ':
if (tctx->prevchar == ' ')
break; // multiple whitespace collapses into one.
// intentional fall-through...
case '_':
case '[':
case ']':
case '(':
case ')':
case '!':
case '+':
case '-':
case ',':
case '.':
case '\n':
if (idx != 0) // finish off existing token.
tctx->token[idx] = '\0';
else // this is a token in itself.
{
if (ch == '\n')
tctx->on_endline = 1;
tctx->source++;
tctx->token[idx++] = ch;
tctx->token[idx++] = '\0';
} // else
return 1;
case '\0':
tctx->token[idx] = '\0';
if (idx != 0) // had any chars? It's a token.
return 1;
ctx->eof = 1;
return 0;
default:
tctx->source++;
tctx->token[idx++] = ch;
break;
} // switch
tctx->prevchar = ch;
} // while
assert(0 && "Shouldn't hit this code");
return 0;
} // tokenize_ctx
static inline int tokenize(Context *ctx)
{
const int rc = tokenize_ctx(ctx, &ctx->tctx);
#if DEBUG_TOKENIZER
printf("TOKENIZE: %d '%s'\n", rc,
(ctx->tctx.token[0] == '\n') ? "\\n" : ctx->tctx.token);
#endif
return rc;
} // tokenize
static void pushback_ctx(Context *ctx, TokenizerContext *tctx)
{
assert(!tctx->pushedback);
tctx->pushedback = 1;
} // pushback_ctx
static inline void pushback(Context *ctx)
{
pushback_ctx(ctx, &ctx->tctx);
#if DEBUG_TOKENIZER
printf("PUSHBACK\n");
#endif
} // pushback
static int nexttoken_ctx(Context *ctx, TokenizerContext *tctx,
const int ignoreeol, const int ignorewhitespace,
const int eolok, const int eosok)
{
while (tokenize_ctx(ctx, tctx))
{
if (tokeq(tctx, "\n"))
{
if (ignoreeol)
continue;
else if (!eolok)
{
fail(ctx, "Unexpected EOL");
return 0;
} // else if
} // if
else if (tokeq(tctx, " "))
{
if (ignorewhitespace)
continue;
} // else if
// skip comments...
else if (tokeq(tctx, "//") || tokeq(tctx, ";"))
{
while (tokenize_ctx(ctx, tctx))
{
if (tokeq(tctx, "\n"))
{
pushback_ctx(ctx, tctx);
break;
} // if
} // while
continue; // pick up from newline, go again.
} // if
break;
} // while
if ((ctx->eof) && (!eosok))
{
fail(ctx, "Unexpected EOF");
return 0;
} // if
return 1;
} // nexttoken_ctx
static inline int nexttoken(Context *ctx, const int ignoreeol,
const int ignorewhitespace, const int eolok,
const int eosok)
{
const int rc = nexttoken_ctx(ctx, &ctx->tctx, ignoreeol,
ignorewhitespace, eolok, eosok);
#if DEBUG_TOKENIZER
printf("NEXTTOKEN: %d '%s'\n", rc,
(ctx->tctx.token[0] == '\n') ? "\\n" : ctx->tctx.token);
#endif
return rc;
} // nexttoken
static void skip_line(Context *ctx)
{
if (!tokeq(&ctx->tctx, "\n"))
{
while (nexttoken(ctx, 0, 1, 1, 1))
{
if (tokeq(&ctx->tctx, "\n"))
break;
} // while
} // if
} // skip_line
static void require_endline(Context *ctx)
{
TokenizerContext *tctx = &ctx->tctx;
const int rc = nexttoken(ctx, 0, 1, 1, 1);
if (ctx->eof)
return; // we'll call this an EOL.
else if ((rc == 0) || (!tokeq(tctx, "\n")))
{
fail(ctx, "Endline expected");
skip_line(ctx);
} // else if
} // require_endline
static int require_comma(Context *ctx)
{
TokenizerContext *tctx = &ctx->tctx;
const int rc = nexttoken(ctx, 0, 1, 0, 0);
if ((rc == 0) || (!tokeq(tctx, ",")))
{
fail(ctx, "Comma expected");
return 0;
} // if
return 1;
} // require_comma
static int parse_register_name(Context *ctx, RegisterType *rtype, int *rnum)
{
TokenizerContext *tctx = &ctx->tctx;
if (!nexttoken(ctx, 0, 1, 0, 0))
return 0;
int neednum = 1;
int regnum = 0;
RegisterType regtype = REG_TYPE_TEMP;
if (tokeq(tctx, "r"))
regtype = REG_TYPE_TEMP;
else if (tokeq(tctx, "v"))
regtype = REG_TYPE_INPUT;
else if (tokeq(tctx, "c"))
regtype = REG_TYPE_CONST;
else if (tokeq(tctx, "i"))
regtype = REG_TYPE_CONSTINT;
else if (tokeq(tctx, "b"))
regtype = REG_TYPE_CONSTBOOL;
else if (tokeq(tctx, "oC"))
regtype = REG_TYPE_COLOROUT;
else if (tokeq(tctx, "s"))
regtype = REG_TYPE_SAMPLER;
else if (tokeq(tctx, "oD"))
regtype = REG_TYPE_ATTROUT;
else if (tokeq(tctx, "l"))
regtype = REG_TYPE_LABEL;
else if (tokeq(tctx, "p"))
regtype = REG_TYPE_PREDICATE;
else if (tokeq(tctx, "oDepth"))
{
regtype = REG_TYPE_DEPTHOUT;
neednum = 0;
} // else if
else if (tokeq(tctx, "aL"))
{
regtype = REG_TYPE_LOOP;
neednum = 0;
} // else if
else if (tokeq(tctx, "o"))
{
if (!shader_is_vertex(ctx) || !shader_version_atleast(ctx, 3, 0))
fail(ctx, "Output register not valid in this shader type");
regtype = REG_TYPE_OUTPUT;
} // else if
else if (tokeq(tctx, "oT"))
{
if (shader_is_vertex(ctx) && shader_version_atleast(ctx, 3, 0))
fail(ctx, "Output register not valid in this shader type");
regtype = REG_TYPE_OUTPUT;
} // else if
else if (tokeq(tctx, "a"))
{
if (!shader_is_vertex(ctx))
fail(ctx, "Address register only valid in vertex shaders.");
regtype = REG_TYPE_ADDRESS;
} // else if
else if (tokeq(tctx, "t"))
{
if (!shader_is_pixel(ctx))
fail(ctx, "Address register only valid in pixel shaders.");
regtype = REG_TYPE_ADDRESS;
} // else if
else if (tokeq(tctx, "vPos"))
{
regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_POSITION;
neednum = 0;
} // else if
else if (tokeq(tctx, "vFace"))
{
regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_FACE;
neednum = 0;
} // else if
else if (tokeq(tctx, "oPos"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POSITION;
neednum = 0;
} // else if
else if (tokeq(tctx, "oFog"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_FOG;
neednum = 0;
} // else if
else if (tokeq(tctx, "oPts"))
{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POINT_SIZE;
neednum = 0;
} // else if
//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
if (neednum)
{
// Make a temp TokenizerContext, since we need to skip whitespace here,
// but if the next non-whitespace token isn't '[', we'll want to get
// that whitespace back.
TokenizerContext tmptctx;
memcpy(&tmptctx, tctx, sizeof (TokenizerContext));
if (!nexttoken_ctx(ctx, &tmptctx, 0, 1, 1, 1))
return 0;
else if (tokeq(&tmptctx, "["))
neednum = 0;
} // if
if (neednum)
{
if (!nexttoken(ctx, 0, 0, 0, 0))
return 0;
uint32 ui32 = 0;
if (!ui32fromstr(tctx->token, &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 int parse_destination_token(Context *ctx)
{
TokenizerContext *tctx = &ctx->tctx;
DestArgInfo *info = &ctx->dest_arg;
memset(info, '\0', sizeof (DestArgInfo));
// See if there are destination modifiers on the instruction itself...
while (1)
{
if (!nexttoken(ctx, 0, 0, 0, 0))
return 1;
else if (tokeq(tctx, " "))
break; // done with modifiers.
else if (!tokeq(tctx, "_"))
fail(ctx, "Expected modifier or whitespace");
else if (!nexttoken(ctx, 0, 0, 0, 0))
return 1;
// !!! FIXME: this can be cleaned up when tokenizer is fixed.
else if (tokeq(tctx, "x"))
{
if (!nexttoken(ctx, 0, 0, 0, 0))
return 1;
else if (tokeq(tctx, "2"))
set_result_shift(ctx, info, 0x1);
else if (tokeq(tctx, "4"))
set_result_shift(ctx, info, 0x2);
else if (tokeq(tctx, "8"))
set_result_shift(ctx, info, 0x3);
else
fail(ctx, "Expected modifier");
} // else if
// !!! FIXME: this can be cleaned up when tokenizer is fixed.
else if (tokeq(tctx, "d"))
{
if (!nexttoken(ctx, 0, 0, 0, 0))
return 1;
else if (tokeq(tctx, "8"))
set_result_shift(ctx, info, 0xD);
else if (tokeq(tctx, "4"))
set_result_shift(ctx, info, 0xE);
else if (tokeq(tctx, "2"))
set_result_shift(ctx, info, 0xF);
else
fail(ctx, "Expected modifier");
} // else if
else if (tokeq(tctx, "sat"))
info->result_mod |= MOD_SATURATE;
else if (tokeq(tctx, "pp"))
info->result_mod |= MOD_PP;
else if (tokeq(tctx, "centroid"))
info->result_mod |= MOD_CENTROID;
else
fail(ctx, "Expected modifier");
} // while
if (!nexttoken(ctx, 0, 1, 0, 0))
return 1;
// !!! FIXME: predicates.
if (tokeq(tctx, "("))
fail(ctx, "Predicates unsupported at this time"); // !!! FIXME: ...
pushback(ctx); // parse_register_name calls nexttoken().
parse_register_name(ctx, &info->regtype, &info->regnum);
if (!nexttoken(ctx, 0, 1, 1, 1))
return 1;
// !!! FIXME: can dest registers do relative addressing?
int invalid_writemask = 0;
int implicit_writemask = 0;
if (!tokeq(tctx, "."))
{
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, 0, 1, 0, 0))
return 1;
else if (tokeq(tctx, ""))
invalid_writemask = 1;
else
{
char *ptr = tctx->token;
info->writemask0 = info->writemask1 = info->writemask2 = info->writemask3 = 0;
if (*ptr == 'x') { info->writemask0 = 1; ptr++; }
if (*ptr == 'y') { info->writemask1 = 1; ptr++; }
if (*ptr == 'z') { info->writemask2 = 1; ptr++; }
if (*ptr == 'w') { info->writemask3 = 1; ptr++; }
if ((ptr == tctx->token) && (shader_is_pixel(ctx)))
{
if (*ptr == 'r') { info->writemask0 = 1; ptr++; }
if (*ptr == 'g') { info->writemask1 = 1; ptr++; }
if (*ptr == 'b') { info->writemask2 = 1; ptr++; }
if (*ptr == 'a') { info->writemask3 = 1; ptr++; }
} // if
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 (ctx->tokenbufpos >= STATICARRAYLEN(ctx->tokenbuf))
{
fail(ctx, "Too many tokens");
return 1;
} // if
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)
{
TokenizerContext *tctx = &ctx->tctx;
int retval = 1;
if (ctx->tokenbufpos >= STATICARRAYLEN(ctx->tokenbuf))
{
fail(ctx, "Too many tokens");
return 0;
} // if
// mark this now, so optional relative addressing token is placed second.
uint32 *token = &ctx->tokenbuf[ctx->tokenbufpos++];
*token = 0;
SourceMod srcmod = SRCMOD_NONE;
int negate = 0;
if (!nexttoken(ctx, 0, 1, 0, 0))
return 1;
else if (tokeq(tctx, "1"))
{
if (!nexttoken(ctx, 0, 1, 0, 0))
return 1;
else if (!tokeq(tctx, "-"))
fail(ctx, "Unexpected value");
else
srcmod = SRCMOD_COMPLEMENT;
} // else
else if (tokeq(tctx, "!"))
srcmod = SRCMOD_NOT;
else if (tokeq(tctx, "-"))
negate = 1;
else
pushback(ctx);
RegisterType regtype;
int regnum;
parse_register_name(ctx, ®type, ®num);
if (!nexttoken(ctx, 0, 1, 1, 1))
return 1;
else if (!tokeq(tctx, "_"))
pushback(ctx);
else if (!nexttoken(ctx, 0, 0, 0, 0))
return 1;
else if (tokeq(tctx, "bias"))
set_source_mod(ctx, negate, SRCMOD_BIAS, SRCMOD_BIASNEGATE, &srcmod);
else if (tokeq(tctx, "bx2"))
set_source_mod(ctx, negate, SRCMOD_SIGN, SRCMOD_SIGNNEGATE, &srcmod);
else if (tokeq(tctx, "x2"))
set_source_mod(ctx, negate, SRCMOD_X2, SRCMOD_X2NEGATE, &srcmod);
else if (tokeq(tctx, "dz"))
set_source_mod(ctx, negate, SRCMOD_DZ, SRCMOD_NONE, &srcmod);
else if (tokeq(tctx, "dw"))
set_source_mod(ctx, negate, SRCMOD_DW, SRCMOD_NONE, &srcmod);
else if (tokeq(tctx, "abs"))
set_source_mod(ctx, negate, SRCMOD_ABS, SRCMOD_ABSNEGATE, &srcmod);
else
fail(ctx, "Invalid source modifier");
if (!nexttoken(ctx, 0, 1, 1, 1))
return 1;
uint32 relative = 0;
if (!tokeq(tctx, "["))
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, 0, 1, 0, 0))
return retval;
else if (!tokeq(tctx, "+"))
pushback(ctx);
else if (!nexttoken(ctx, 0, 1, 0, 0))
return retval;
else
{
if (regnum != 0) // !!! FIXME: maybe c3[a0.x + 5] is legal and becomes c[a0.x + 8] ?
fail(ctx, "Relative addressing with explicit register number.");
uint32 ui32 = 0;
if (!ui32fromstr(tctx->token, &ui32))
fail(ctx, "Invalid relative addressing offset");
regnum += (int) ui32;
} // else
if (!nexttoken(ctx, 0, 1, 0, 0))
return retval;
else if (!tokeq(tctx, "]"))
fail(ctx, "Expected ']'");
} // else
if (!nexttoken(ctx, 0, 1, 1, 1))
return retval;
int invalid_swizzle = 0;
uint32 swizzle = 0;
if (!tokeq(tctx, "."))
{
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, 0, 1, 0, 0))
return retval;
else if (tokeq(tctx, ""))
invalid_swizzle = 1;
else