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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"
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#define DEBUG_ASSEMBLY_PARSER 0
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// Simple linked list to cache source filenames, so we don't have to copy
// the same string over and over for each opcode.
typedef struct FilenameCache
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{
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char *filename;
struct FilenameCache *next;
} FilenameCache;
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typedef struct SourcePos
{
const char *filename;
uint32 line;
} SourcePos;
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// Context...this is state that changes as we assemble a shader...
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typedef struct Context
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{
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int isfail;
int out_of_memory;
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MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
void *malloc_data;
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int error_count;
ErrorList *errors;
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Preprocessor *preprocessor;
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MOJOSHADER_parsePhase parse_phase;
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MOJOSHADER_shaderType shader_type;
uint8 major_ver;
uint8 minor_ver;
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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!
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DestArgInfo dest_arg;
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uint32 *output;
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SourcePos *token_to_source;
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uint8 *ctab;
uint32 ctab_len;
uint32 ctab_allocation;
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size_t output_len;
size_t output_allocation;
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FilenameCache *filename_cache;
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} Context;
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// Convenience functions for allocators...
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static inline void out_of_memory(Context *ctx)
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{
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ctx->isfail = ctx->out_of_memory = 1;
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} // 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
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static inline char *StrDup(Context *ctx, const char *str)
{
char *retval = (char *) Malloc(ctx, strlen(str) + 1);
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if (retval != NULL)
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strcpy(retval, str);
return retval;
} // StrDup
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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
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static void failf(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static void failf(Context *ctx, const char *fmt, ...)
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{
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const char *fname = NULL;
unsigned int linenum = 0;
int error_position = 0;
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ctx->isfail = 1;
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switch (ctx->parse_phase)
{
case MOJOSHADER_PARSEPHASE_NOTSTARTED:
error_position = -2;
break;
case MOJOSHADER_PARSEPHASE_WORKING:
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fname = preprocessor_sourcepos(ctx->preprocessor, &linenum);
error_position = (int) linenum;
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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
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{
va_start(ap, fmt);
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vsnprintf(failstr, len + 1, fmt, ap); // rebuild it.
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va_end(ap);
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error->error.error = failstr;
error->error.filename = fname ? StrDup(ctx, fname) : NULL;
error->error.error_position = error_position;
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error->next = NULL;
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ErrorList *prev = NULL;
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ErrorList *item = ctx->errors;
while (item != NULL)
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{
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prev = item;
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item = item->next;
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} // while
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if (prev == NULL)
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ctx->errors = error;
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else
prev->next = error;
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ctx->error_count++;
} // else
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} // failf
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static inline void fail(Context *ctx, const char *reason)
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{
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failf(ctx, "%s", reason);
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} // fail
static inline int isfail(const Context *ctx)
{
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return ctx->isfail;
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} // 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
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static inline void pushback(Context *ctx)
{
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#if DEBUG_ASSEMBLY_PARSER
printf("ASSEMBLER PUSHBACK\n");
#endif
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assert(!ctx->pushedback);
ctx->pushedback = 1;
} // pushback
static Token _nexttoken(Context *ctx)
{
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;
} // if
else
{
const char *err = preprocessor_error(ctx->preprocessor);
if (err)
fail(ctx, err);
} // else
return ctx->tokenval;
} // _nexttoken
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// !!! FIXME: cut-and-paste from preprocessor.
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#if !DEBUG_ASSEMBLY_PARSER
#define print_debug_token(ctx)
#else
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static void print_debug_token(Context *ctx)
{
printf("ASSEMBLER TOKEN: \"");
unsigned int i;
for (i = 0; i < ctx->tokenlen; i++)
{
if (ctx->token[i] == '\n')
printf("\\n");
else
printf("%c", ctx->token[i]);
} // for
printf("\" (");
switch (ctx->tokenval)
{
#define TOKENCASE(x) case x: printf("%s", #x); break
TOKENCASE(TOKEN_UNKNOWN);
TOKENCASE(TOKEN_IDENTIFIER);
TOKENCASE(TOKEN_INT_LITERAL);
TOKENCASE(TOKEN_FLOAT_LITERAL);
TOKENCASE(TOKEN_STRING_LITERAL);
TOKENCASE(TOKEN_ELLIPSIS);
TOKENCASE(TOKEN_RSHIFT);
TOKENCASE(TOKEN_LSHIFT);
TOKENCASE(TOKEN_ANDAND);
TOKENCASE(TOKEN_OROR);
TOKENCASE(TOKEN_LEQ);
TOKENCASE(TOKEN_GEQ);
TOKENCASE(TOKEN_EQL);
TOKENCASE(TOKEN_NEQ);
TOKENCASE(TOKEN_HASHHASH);
TOKENCASE(TOKEN_PP_INCLUDE);
TOKENCASE(TOKEN_PP_LINE);
TOKENCASE(TOKEN_PP_DEFINE);
TOKENCASE(TOKEN_PP_UNDEF);
TOKENCASE(TOKEN_PP_IF);
TOKENCASE(TOKEN_PP_IFDEF);
TOKENCASE(TOKEN_PP_IFNDEF);
TOKENCASE(TOKEN_PP_ELSE);
TOKENCASE(TOKEN_PP_ELIF);
TOKENCASE(TOKEN_PP_ENDIF);
TOKENCASE(TOKEN_PP_ERROR);
TOKENCASE(TOKEN_PP_INCOMPLETE_COMMENT);
TOKENCASE(TOKEN_EOI);
#undef TOKENCASE
case ((Token) '\n'):
printf("'\\n'");
break;
default:
assert(((int)ctx->tokenval) < 256);
printf("'%c'", (char) ctx->tokenval);
break;
} // switch
printf(")\n");
}
#endif
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static Token nexttoken(Context *ctx)
{
if (ctx->pushedback)
{
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print_debug_token(ctx);
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ctx->pushedback = 0;
return ctx->tokenval;
} // if
Token token = _nexttoken(ctx);
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while (token == ((Token) '\n'))
token = _nexttoken(ctx); // skip endlines.
if (token == ((Token) ';')) // single line comment in assembler.
{
do
{
token = _nexttoken(ctx);
} while ((token != ((Token) '\n')) && (token != TOKEN_EOI));
while (token == ((Token) '\n'))
token = _nexttoken(ctx); // skip endlines.
} // if
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print_debug_token(ctx);
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return token;
} // nexttoken
static const char *cache_filename(Context *ctx, const char *fname)
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{
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if (fname == NULL)
return NULL;
// !!! FIXME: this could be optimized into a hash table, but oh well.
FilenameCache *item = ctx->filename_cache;
while (item != NULL)
{
if (strcmp(item->filename, fname) == 0)
return item->filename;
item = item->next;
} // while
// new cache item.
item = (FilenameCache *) Malloc(ctx, sizeof (FilenameCache));
if (item == NULL)
return NULL;
item->filename = (char *) Malloc(ctx, strlen(fname) + 1);
if (item->filename == NULL)
{
Free(ctx, item);
return NULL;
} // if
strcpy(item->filename, fname);
item->next = ctx->filename_cache;
ctx->filename_cache = item;
return item->filename;
} // cache_filename
static void free_filename_cache(Context *ctx)
{
FilenameCache *item = ctx->filename_cache;
while (item != NULL)
{
FilenameCache *next = item->next;
Free(ctx, item->filename);
Free(ctx, item);
item = next;
} // while
} // free_filename_cache
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static inline void add_token_sourcepos(Context *ctx, const size_t idx)
{
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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 = cache_filename(ctx, fname);
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} // add_token_sourcepos
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static void output_token_noswap(Context *ctx, const uint32 token)
{
if (isfail(ctx))
return;
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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;
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void *ptr;
ptr = Malloc(ctx, newsize * sizeof (uint32));
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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;
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ptr = Malloc(ctx, newsize * sizeof (SourcePos));
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if (ptr == NULL)
return;
if (ctx->output_len > 0)
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memcpy(ptr, ctx->token_to_source, ctx->output_len * sizeof (SourcePos));
Free(ctx, ctx->token_to_source);
ctx->token_to_source = (SourcePos *) ptr;
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ctx->output_allocation = newsize;
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} // if
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ctx->output[ctx->output_len] = token;
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add_token_sourcepos(ctx, ctx->output_len);
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ctx->output_len++;
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} // 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
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static int require_comma(Context *ctx)
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{
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const Token token = nexttoken(ctx);
if (token != ((Token) ','))
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{
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fail(ctx, "Comma expected");
return 0;
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} // if
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return 1;
} // require_comma
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static int check_token_segment(Context *ctx, const char *str)
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{
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// !!! 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
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static int check_token(Context *ctx, const char *str)
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{
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const size_t len = strlen(str);
if ( (ctx->tokenlen != len) || (strncasecmp(ctx->token, str, len) != 0) )
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return 0;
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ctx->token += len;
ctx->tokenlen = 0;
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return 1;
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} // check_token
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static int ui32fromtoken(Context *ctx, uint32 *_val)
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{
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int i;
for (i = 0; i < ctx->tokenlen; i++)
{
if ((ctx->token[i] < '0') || (ctx->token[i] > '9'))
break;
} // for
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if (i == 0)
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{
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*_val = 0;
return 0;
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} // if
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const int len = i;
uint32 val = 0;
uint32 mult = 1;
while (i--)
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{
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val += ((uint32) (ctx->token[i] - '0')) * mult;
mult *= 10;
} // while
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ctx->token += len;
ctx->tokenlen -= len;
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*_val = val;
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return 1;
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} // ui32fromtoken
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static int parse_register_name(Context *ctx, RegisterType *rtype, int *rnum)
{
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if (nexttoken(ctx) != TOKEN_IDENTIFIER)
{
fail(ctx, "Expected register");
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return 0;
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} // if
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int neednum = 1;
int regnum = 0;
RegisterType regtype = REG_TYPE_TEMP;
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// Watch out for substrings! oDepth must be checked before oD, since
// the latter will match either case.
if (check_token_segment(ctx, "oDepth"))
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{
regtype = REG_TYPE_DEPTHOUT;
neednum = 0;
} // else if
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else if (check_token_segment(ctx, "vFace"))
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{
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regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_FACE;
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neednum = 0;
} // else if
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else if (check_token_segment(ctx, "vPos"))
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{
regtype = REG_TYPE_MISCTYPE;
regnum = (int) MISCTYPE_TYPE_POSITION;
neednum = 0;
} // else if
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else if (check_token_segment(ctx, "oPos"))
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{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POSITION;
neednum = 0;
} // else if
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else if (check_token_segment(ctx, "oFog"))
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{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_FOG;
neednum = 0;
} // else if
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else if (check_token_segment(ctx, "oPts"))
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{
regtype = REG_TYPE_RASTOUT;
regnum = (int) RASTOUT_TYPE_POINT_SIZE;
neednum = 0;
} // else if
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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;
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//case REG_TYPE_TEMPFLOAT16: // !!! FIXME: don't know this asm string
else
{
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fail(ctx, "expected register type");
regtype = REG_TYPE_CONST;
regnum = 0;
neednum = 0;
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} // else
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// "c[5]" is the same as "c5", so if the token is done, see if next is '['.
if ((neednum) && (ctx->tokenlen == 0))
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{
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if (nexttoken(ctx) == ((Token) '['))
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neednum = 0; // don't need a number on register name itself.
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pushback(ctx);
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} // if
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if (neednum)
{
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uint32 ui32 = 0;
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if (!ui32fromtoken(ctx, &ui32))
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fail(ctx, "Invalid register index");
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regnum = (int) ui32;
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} // 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
{
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fail(ctx, "Invalid const register index");
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} // else
} // if
*rtype = regtype;
*rnum = regnum;
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return 1;
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} // parse_register_name
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static void set_result_shift(Context *ctx, DestArgInfo *info, const int val)
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{
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if (info->result_shift != 0)
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fail(ctx, "Multiple result shift modifiers");
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info->result_shift = val;
} // set_result_shift
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static int parse_destination_token(Context *ctx)
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{
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DestArgInfo *info = &ctx->dest_arg;
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memset(info, '\0', sizeof (DestArgInfo));
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// 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"))
695
info->result_mod |= MOD_SATURATE;
696
else if (check_token_segment(ctx, "_pp"))
697
info->result_mod |= MOD_PP;
698
else if (check_token_segment(ctx, "_centroid"))
699
700
info->result_mod |= MOD_CENTROID;
else
701
invalid_modifier = 1;
702
703
} // while
704
705
if (invalid_modifier)
fail(ctx, "Invalid destination modifier");
706
707
// !!! FIXME: predicates.
708
if (nexttoken(ctx) == ((Token) '('))
709
710
fail(ctx, "Predicates unsupported at this time"); // !!! FIXME: ...
711
712
pushback(ctx); // parse_register_name calls nexttoken().
713
parse_register_name(ctx, &info->regtype, &info->regnum);
714
715
716
// parse_register_name() can't check this: dest regs might have modifiers.
if (ctx->tokenlen > 0)
fail(ctx, "invalid register name");
717
718
719
// !!! FIXME: can dest registers do relative addressing?
720
int invalid_writemask = 0;
721
int implicit_writemask = 0;
722
if (nexttoken(ctx) != ((Token) '.'))
723
{
724
implicit_writemask = 1;
725
726
727
728
info->writemask = 0xF;
info->writemask0 = info->writemask1 = info->writemask2 = info->writemask3 = 1;
pushback(ctx); // no explicit writemask; do full mask.
} // if
729
730
731
732
// !!! 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) )
733
fail(ctx, "Writemask specified for scalar register");
734
else if (nexttoken(ctx) != TOKEN_IDENTIFIER)
735
invalid_writemask = 1;
736
737
else
{
738
739
740
741
742
743
// !!! FIXME: is out-of-order okay (yxzw instead of xyzw?)
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;
744
info->writemask0 = info->writemask1 = info->writemask2 = info->writemask3 = 0;
745
746
747
748
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++; }
749
if ((ptr == ctx->token) && (shader_is_pixel(ctx)))
750
{
751
752
753
754
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++; }
755
756
757
} // if
if (*ptr != '\0')
758
invalid_writemask = 1;
759
760
761
762
763
764
765
info->writemask = ( ((info->writemask0 & 0x1) << 0) |
((info->writemask1 & 0x1) << 1) |
((info->writemask2 & 0x1) << 2) |
((info->writemask3 & 0x1) << 3) );
} // else
766
767
768
if (invalid_writemask)
fail(ctx, "Invalid writemask");
769
770
771
772
773
// !!! 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) )
774
fail(ctx, "Writemask specified for scalar register");
775
776
} // if
777
778
779
info->orig_writemask = info->writemask;
if (ctx->tokenbufpos >= STATICARRAYLEN(ctx->tokenbuf))
780
781
782
783
{
fail(ctx, "Too many tokens");
return 1;
} // if
784
785
ctx->tokenbuf[ctx->tokenbufpos++] =
786
( ((((uint32) 1)) << 31) |
787
788
789
790
((((uint32) info->regnum) & 0x7ff) << 0) |
((((uint32) info->relative) & 0x1) << 13) |
((((uint32) info->result_mod) & 0xF) << 20) |
((((uint32) info->result_shift) & 0xF) << 24) |
791
((((uint32) info->writemask) & 0xF) << 16) |
792
793
794
795
796
797
798
((((uint32) info->regtype) & 0x7) << 28) |
((((uint32) info->regtype) & 0x18) << 8) );
return 1;
} // parse_destination_token
799
800
801
static void set_source_mod(Context *ctx, const int negate,
const SourceMod norm, const SourceMod negated,
SourceMod *srcmod)
802
{
803
804
805
806
807
if ( (*srcmod != SRCMOD_NONE) || (negate && (negated == SRCMOD_NONE)) )
fail(ctx, "Incompatible source modifiers");
else
*srcmod = ((negate) ? negated : norm);
} // set_source_mod
808
809
810
static int parse_source_token_maybe_relative(Context *ctx, const int relok)
811
{
812
813
814
int retval = 1;
if (ctx->tokenbufpos >= STATICARRAYLEN(ctx->tokenbuf))
815
816
817
818
{
fail(ctx, "Too many tokens");
return 0;
} // if
819
820
// mark this now, so optional relative addressing token is placed second.
821
822
uint32 *outtoken = &ctx->tokenbuf[ctx->tokenbufpos++];
*outtoken = 0;
823
824
825
SourceMod srcmod = SRCMOD_NONE;
int negate = 0;
826
827
828
829
830
831
832
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")) )
833
{
834
835
if (nexttoken(ctx) != ((Token) '-'))
fail(ctx, "Unexpected token");
836
837
838
839
else
srcmod = SRCMOD_COMPLEMENT;
} // else
else
840
{
841
pushback(ctx);
842
} // else
843
844
845
RegisterType regtype;
int regnum;
846
parse_register_name(ctx, ®type, ®num);
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
if (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");
} // if
865
866
uint32 relative = 0;
867
if (nexttoken(ctx) != ((Token) '['))
868
869
870
pushback(ctx); // not relative addressing?
else
{
871
872
873
874
875
876
if (!relok)
fail(ctx, "Relative addressing not permitted here.");
else
retval++;
parse_source_token_maybe_relative(ctx, 0);
877
relative = 1;
878
879
if (nexttoken(ctx) != ((Token) '+'))
880
881
882
pushback(ctx);
else
{
883
884
// !!! FIXME: maybe c3[a0.x + 5] is legal and becomes c[a0.x + 8] ?
if (regnum != 0)
885
fail(ctx, "Relative addressing with explicit register number.");
886
887
uint32 ui32 = 0;
888
889
890
891
if ( (nexttoken(ctx) != TOKEN_INT_LITERAL) ||
(!ui32fromtoken(ctx, &ui32)) ||
(ctx->tokenlen != 0) )
{
892
fail(ctx, "Invalid relative addressing offset");
893
} // if
894
895
896
regnum += (int) ui32;
} // else
897
if (nexttoken(ctx) != ((Token) ']'))
898
fail(ctx, "Expected ']'");
899
} // else
900
901
int invalid_swizzle = 0;
902
uint32 swizzle = 0;
903
if (nexttoken(ctx) != ((Token) '.'))
904
905
906
907
{
swizzle = 0xE4; // 0xE4 == 11100100 ... 0 1 2 3. No swizzle.
pushback(ctx); // no explicit writemask; do full mask.
} // if
908
else if (scalar_register(ctx->shader_type, regtype, regnum))
909
fail(ctx, "Swizzle specified for scalar register");
910
else if (nexttoken(ctx) != TOKEN_IDENTIFIER)
911
invalid_swizzle = 1;
912
913
else
{
914
915
916
917
char tokenbytes[5] = { '\0', '\0', '\0', '\0', '\0' };
const unsigned int tokenlen = ctx->tokenlen;
memcpy(tokenbytes, ctx->token, ((tokenlen < 4) ? tokenlen : 4));
918
// deal with shortened form (.x = .xxxx, etc).
919
920
921
922
923
924
925
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)
926
invalid_swizzle = 1;
927
tokenbytes[4] = '\0';
928
929
uint32 val = 0;
930
931
int saw_xyzw = 0;
int saw_rgba = 0;
932
int i;
933
934
for (i = 0; i < 4; i++)
{
935
const int component = (int) tokenbytes[i];
936
937
938
939
940
941
942
943
944
945
switch (component)
{
case 'x': val = 0; saw_xyzw = 1; break;
case 'y': val = 1; saw_xyzw = 1; break;
case 'z': val = 2; saw_xyzw = 1; break;
case 'w': val = 3; saw_xyzw = 1; break;
case 'r': val = 0; saw_rgba = 1; break;
case 'g': val = 1; saw_rgba = 1; break;
case 'b': val = 2; saw_rgba = 1; break;
case 'a': val = 3; saw_rgba = 1; break;
946
default: invalid_swizzle = 1; break;
947
948
949
} // switch
swizzle |= (val << (i * 2));
} // for
950
951
if (saw_xyzw && saw_rgba)
952
invalid_swizzle = 1;
953
954
else if (saw_rgba && !shader_is_pixel(ctx))
invalid_swizzle = 1;
955
} // else
956
957
958
959
if (invalid_swizzle)
fail(ctx, "Invalid swizzle");
960
961
962
963
964
965
966
*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) );
967
968
969
return retval;
} // parse_source_token_maybe_relative
970
971
972
static inline int parse_source_token(Context *ctx)
973
{
974
975
return parse_source_token_maybe_relative(ctx, 1);
} // parse_source_token
976
977
978
979
static int parse_args_NULL(Context *ctx)
{
980
return 1;
981
} // parse_args_NULL
982
983
984
static int parse_num(Context *ctx, const int floatok, uint32 *value)
985
986
{
union { float f; int32 si32; uint32 ui32; } cvt;
987
988
989
990
991
992
993
994
int negative = 0;
Token token = nexttoken(ctx);
if (token == ((Token) '-'))
{
negative = 1;
token = nexttoken(ctx);
} // if
995
996
if (token == TOKEN_INT_LITERAL)
997
{
998
999
int d = 0;
sscanf(ctx->token, "%d", &d);
1000
if (floatok)