src/mesa/state_tracker/st_atom.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "glheader.h"
  30 #include "context.h"
  31
  32 #include "pipe/p_defines.h"
  33 #include "st_context.h"
  34 #include "st_atom.h"
  35 #include "st_program.h"
  36
  37
  38
  39 /* This is used to initialize st->atoms[].  We could use this list
  40  * directly except for a single atom, st_update_constants, which has a
  41  * .dirty value which changes according to the parameters of the
  42  * current fragment and vertex programs, and so cannot be a static
  43  * value.
  44  */
  45 static const struct st_tracked_state *atoms[] =
  46 {
  47    &st_update_framebuffer,
  48    &st_update_clear_color,
  49    &st_update_depth_stencil,
  50    &st_update_clip,
  51
  52    &st_update_tnl,
  53    &st_update_shader,
  54
  55    &st_update_rasterizer,
  56    &st_update_polygon_stipple,
  57    &st_update_viewport,
  58    &st_update_scissor,
  59    &st_update_blend,
  60    &st_update_sampler,
  61    &st_update_texture,
  62    &st_update_vs_constants,
  63    &st_update_fs_constants,
  64    &st_update_alpha_test
  65 };
  66
  67
  68 void st_init_atoms( struct st_context *st )
  69 {
  70    GLuint i;
  71
  72    st->atoms = malloc(sizeof(atoms));
  73    st->nr_atoms = sizeof(atoms)/sizeof(*atoms);
  74    memcpy(st->atoms, atoms, sizeof(atoms));
  75
  76    /* Patch in a pointer to the dynamic state atom:
  77     */
  78    for (i = 0; i < st->nr_atoms; i++) {
  79       if (st->atoms[i] == &st_update_vs_constants) {
  80          st->atoms[i] = &st->constants.tracked_state[PIPE_SHADER_VERTEX];
  81          st->atoms[i][0] = st_update_vs_constants;
  82       }
  83
  84       if (st->atoms[i] == &st_update_fs_constants) {
  85          st->atoms[i] = &st->constants.tracked_state[PIPE_SHADER_FRAGMENT];
  86          st->atoms[i][0] = st_update_fs_constants;
  87       }
  88    }
  89 }
  90
  91
  92 void st_destroy_atoms( struct st_context *st )
  93 {
  94    if (st->atoms) {
  95       free(st->atoms);
  96       st->atoms = NULL;
  97    }
  98 }
  99
 100
 101 /***********************************************************************
 102  */
 103
 104 static GLboolean check_state( const struct st_state_flags *a,
 105                               const struct st_state_flags *b )
 106 {
 107    return ((a->mesa & b->mesa) ||
 108            (a->st & b->st));
 109 }
 110
 111 static void accumulate_state( struct st_state_flags *a,
 112                               const struct st_state_flags *b )
 113 {
 114    a->mesa |= b->mesa;
 115    a->st |= b->st;
 116 }
 117
 118
 119 static void xor_states( struct st_state_flags *result,
 120                              const struct st_state_flags *a,
 121                               const struct st_state_flags *b )
 122 {
 123    result->mesa = a->mesa ^ b->mesa;
 124    result->st = a->st ^ b->st;
 125 }
 126
 127
 128 /* Too complex to figure out, just check every time:
 129  */
 130 static void check_program_state( struct st_context *st )
 131 {
 132    GLcontext *ctx = st->ctx;
 133
 134    if (ctx->VertexProgram._Current != &st->vp->Base)
 135       st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
 136
 137    if (ctx->FragmentProgram._Current != &st->fp->Base)
 138       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 139
 140 }
 141
 142
 143 /***********************************************************************
 144  * Update all derived state:
 145  */
 146
 147 void st_validate_state( struct st_context *st )
 148 {
 149    struct st_state_flags *state = &st->dirty;
 150    GLuint i;
 151
 152    check_program_state( st );
 153
 154    if (state->st == 0)
 155       return;
 156
 157 //   _mesa_printf("%s %x/%x\n", __FUNCTION__, state->mesa, state->st);
 158
 159    if (1) {
 160       /* Debug version which enforces various sanity checks on the
 161        * state flags which are generated and checked to help ensure
 162        * state atoms are ordered correctly in the list.
 163        */
 164       struct st_state_flags examined, prev;
 165       memset(&examined, 0, sizeof(examined));
 166       prev = *state;
 167
 168       for (i = 0; i < st->nr_atoms; i++) {
 169          const struct st_tracked_state *atom = st->atoms[i];
 170          struct st_state_flags generated;
 171
 172 //       _mesa_printf("atom %s %x/%x\n", atom->name, atom->dirty.mesa, atom->dirty.st);
 173
 174          if (!(atom->dirty.mesa || atom->dirty.st) ||
 175              !atom->update) {
 176             _mesa_printf("malformed atom %s\n", atom->name);
 177             assert(0);
 178          }
 179
 180          if (check_state(state, &atom->dirty)) {
 181             st->atoms[i]->update( st );
 182 //          _mesa_printf("after: %x\n", atom->dirty.mesa);
 183          }
 184
 185          accumulate_state(&examined, &atom->dirty);
 186
 187          /* generated = (prev ^ state)
 188           * if (examined & generated)
 189           *     fail;
 190           */
 191          xor_states(&generated, &prev, state);
 192          assert(!check_state(&examined, &generated));
 193          prev = *state;
 194       }
 195 //      _mesa_printf("\n");
 196
 197    }
 198    else {
 199       const GLuint nr = st->nr_atoms;
 200
 201       for (i = 0; i < nr; i++) {
 202          if (check_state(state, &st->atoms[i]->dirty))
 203             st->atoms[i]->update( st );
 204       }
 205    }
 206
 207    memset(state, 0, sizeof(*state));
 208 }
 209
 210
 211