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/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 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 ITS 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.
*
**************************************************************************/
#include "glheader.h"
#include "context.h"
#include "st_context.h"
#include "st_atom.h"
/* This is used to initialize st->atoms[]. We could use this list
* directly except for a single atom, st_update_constants, which has a
* .dirty value which changes according to the parameters of the
* current fragment and vertex programs, and so cannot be a static
* value.
*/
static const struct st_tracked_state *atoms[] =
{
&st_update_cbuf,
&st_update_clip,
&st_update_fs,
&st_update_setup,
&st_update_viewport,
&st_update_scissor,
&st_update_blend,
&st_update_stencil,
/* will be patched out at runtime */
/* &st_update_constants */
};
void st_init_atoms( struct st_context *st )
{
GLuint i;
st->atoms = _mesa_malloc(sizeof(atoms));
st->nr_atoms = sizeof(atoms)/sizeof(*atoms);
memcpy(st->atoms, atoms, sizeof(atoms));
/* Patch in a pointer to the dynamic state atom:
*/
for (i = 0; i < st->nr_atoms; i++)
if (st->atoms[i] == &st_update_constants)
st->atoms[i] = &st->constants.tracked_state;
memcpy(&st->constants.tracked_state,
&st_update_constants,
sizeof(st_update_constants));
}
void st_destroy_atoms( struct st_context *st )
{
if (st->atoms) {
_mesa_free(st->atoms);
st->atoms = NULL;
}
}
/***********************************************************************
*/
static GLboolean check_state( const struct st_state_flags *a,
const struct st_state_flags *b )
{
return ((a->mesa & b->mesa) ||
(a->st & b->st));
}
static void accumulate_state( struct st_state_flags *a,
const struct st_state_flags *b )
{
a->mesa |= b->mesa;
a->st |= b->st;
}
static void xor_states( struct st_state_flags *result,
const struct st_state_flags *a,
const struct st_state_flags *b )
{
result->mesa = a->mesa ^ b->mesa;
result->st = a->st ^ b->st;
}
/***********************************************************************
* Update all derived state:
*/
void st_validate_state( struct st_context *st )
{
struct st_state_flags *state = &st->dirty;
GLuint i;
if (state->st == 0)
return;
if (1) {
/* Debug version which enforces various sanity checks on the
* state flags which are generated and checked to help ensure
* state atoms are ordered correctly in the list.
*/
struct st_state_flags examined, prev;
_mesa_memset(&examined, 0, sizeof(examined));
prev = *state;
for (i = 0; i < st->nr_atoms; i++) {
const struct st_tracked_state *atom = st->atoms[i];
struct st_state_flags generated;
assert(atom->dirty.mesa ||
atom->dirty.st);
assert(atom->update);
if (check_state(state, &atom->dirty)) {
st->atoms[i]->update( st );
}
accumulate_state(&examined, &atom->dirty);
/* generated = (prev ^ state)
* if (examined & generated)
* fail;
*/
xor_states(&generated, &prev, state);
assert(!check_state(&examined, &generated));
prev = *state;
}
}
else {
const GLuint nr = st->nr_atoms;
for (i = 0; i < nr; i++) {
if (check_state(state, &st->atoms[i]->dirty))
st->atoms[i]->update( st );
}
}
memset(state, 0, sizeof(*state));
}
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