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/*
* Copyright 2003 Tungsten Graphics, inc.
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 (including the next
* paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* TUNGSTEN GRAPHICS AND/OR THEIR SUPPLIERS 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.
*
* Authors:
* Keith Whitwell <keithw@tungstengraphics.com>
*/
#include "glheader.h"
#include "context.h"
#include "colormac.h"
#include "t_context.h"
#include "t_vertex.h"
#include "simple_list.h"
#ifdef WIN32
#define vsnprintf _vsnprintf
#endif
/* A version of code generation for t_clipspace_codegen.c which prints
* out 'c' code to implement the generated function. A useful
* debugging tool, and in concert with something like tcc or a
* library-ized gcc, could do the whole job.
*/
static GLboolean emit( struct tnl_clipspace_codegen *p,
const char *fmt,
... )
{
if (p->buf_used < p->buf_size) {
va_list ap;
va_start( ap, fmt );
p->buf_used += vsnprintf( p->buf + p->buf_used,
p->buf_size - p->buf_used,
fmt, ap );
va_end( ap );
}
return p->buf_used < p->buf_size;
}
static GLboolean print_header( struct tnl_clipspace_codegen *p,
struct tnl_clipspace *vtx )
{
p->buf_used = 0;
p->out_offset = 0;
return
emit(p,
"struct tnl_clipspace_attr\n"
"{\n"
" unsigned int attrib; \n"
" unsigned int format;\n"
" unsigned int vertoffset; \n"
" unsigned int vertattrsize; \n"
" char *inputptr;\n"
" unsigned int inputstride;\n"
" void *insert;\n"
" void *emit;\n"
" void * extract;\n"
" const float *vp; \n"
"};\n"
"\n"
) &&
emit(p,
"void emit_vertices( int start, int end, char *dest, \n"
" struct tnl_clipspace_attr *a) \n"
"{\n"
" int i;"
" for (i = start ; i < end ; i++, dest += %d) {\n",
vtx->vertex_size);
}
static GLboolean print_footer( struct tnl_clipspace_codegen *p )
{
return
emit(p,
" }\n"
"}\n"
);
}
static GLboolean emit_reg( struct tnl_clipspace_codegen *p, GLint reg )
{
int idx = reg & REG_OFFSET_MASK;
switch (reg & REG_MASK) {
case REG_IN: return emit(p, "in[%d]", idx);
case REG_VP: return emit(p, "vp[%d]", idx);
case REG_TMP: return emit(p, "temp[%d]", idx); /* not used? */
case REG_OUT: return emit(p, "out[%d]", idx);
}
return GL_FALSE;
}
static GLboolean print_mov( struct tnl_clipspace_codegen *p, GLint dest, GLint src )
{
return
emit(p, " ") &&
emit_reg(p, dest) &&
emit(p, " = ") &&
emit_reg(p, src) &&
emit(p, ";\n");
}
static GLboolean print_const( struct tnl_clipspace_codegen *p,
GLint dest, GLfloat c )
{
return
emit(p, " ") &&
emit_reg(p, dest) &&
emit(p, " = %g;\n", c);
}
static GLboolean print_const_chan( struct tnl_clipspace_codegen *p,
GLint dest, GLchan c )
{
return
emit(p, " ") &&
emit_reg(p, dest) &&
emit(p, " = ") &&
#if CHAN_TYPE == GL_FLOAT
emit(p, "%f", c) &&
#else
emit(p, "%d", c) &&
#endif
emit(p, ";\n");
}
static GLboolean print_const_ubyte( struct tnl_clipspace_codegen *p,
GLint dest, GLubyte c )
{
return
emit(p, " ") &&
emit_reg(p, dest) &&
emit(p, " = %x;\n", c);
}
static GLboolean print_mad( struct tnl_clipspace_codegen *p,
GLint dest, GLint src0, GLint src1, GLint src2 )
{
return
emit(p, " ") &&
emit_reg(p, dest) &&
emit(p, " = ") &&
emit_reg(p, src0) &&
emit(p, " * ") &&
emit_reg(p, src1) &&
emit(p, " + ") &&
emit_reg(p, src2) &&
emit(p, ";\n");
}
static GLboolean print_float_to_ubyte( struct tnl_clipspace_codegen *p,
GLint dest, GLint src )
{
return
emit(p, " ") &&
emit(p, "UNCLAMPED_FLOAT_TO_UBYTE(") &&
emit_reg(p, dest) &&
emit(p, ", ") &&
emit_reg(p, src) &&
emit(p, ");\n");
}
static GLboolean print_float_to_chan( struct tnl_clipspace_codegen *p,
GLint dest, GLint src )
{
return
emit(p, " ") &&
emit(p, "UNCLAMPED_FLOAT_TO_CHAN(") &&
emit_reg(p, dest) &&
emit(p, ", ") &&
emit_reg(p, src) &&
emit(p, ");\n");
}
static GLboolean print_attr_header( struct tnl_clipspace_codegen *p,
struct tnl_clipspace_attr *a,
GLint j,
GLenum out_type,
GLboolean need_vp)
{
char *out_type_str = "void";
switch(out_type) {
case GL_FLOAT: out_type_str = "float"; break;
case GL_UNSIGNED_BYTE: out_type_str = "unsigned char"; break;
case GL_UNSIGNED_SHORT: out_type_str = "unsigned short"; break;
}
return
emit(p, " {\n") &&
(need_vp ? emit(p, " const float *vp = a[%d].vp;\n", j) : 1) &&
emit(p, " %s *out = (%s *)(dest + %d);\n",
out_type_str, out_type_str, a[j].vertoffset) &&
emit(p, " const float *in = (const float *)a[%d].inputptr;\n",
j) &&
emit(p, " a[%d].inputptr += a[%d].inputstride;\n", j, j);
}
static GLboolean print_attr_footer( struct tnl_clipspace_codegen *p )
{
return emit(p, " }\n");
}
static tnl_emit_func print_store_func( struct tnl_clipspace_codegen *p )
{
fprintf(stderr, "print_store_func: emitted:\n%s\n", p->buf);
return 0;
}
void _tnl_init_c_codegen( struct tnl_clipspace_codegen *p )
{
p->emit_header = print_header;
p->emit_footer = print_footer;
p->emit_attr_header = print_attr_header;
p->emit_attr_footer = print_attr_footer;
p->emit_mov = print_mov;
p->emit_const = print_const;
p->emit_mad = print_mad;
p->emit_float_to_chan = print_float_to_chan;
p->emit_const_chan = print_const_chan;
p->emit_float_to_ubyte = print_float_to_ubyte;
p->emit_const_ubyte = print_const_ubyte;
p->emit_store_func = print_store_func;
make_empty_list(&p->codegen_list);
p->buf_size = 2048;
p->buf = MALLOC(p->buf_size);
}
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