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 "main/glheader.h"
  30 #include "main/context.h"
  31
  32 #include "pipe/p_defines.h"
  33 #include "st_context.h"
  34 #include "st_atom.h"
  35 #include "st_cb_bitmap.h"
  36 #include "st_program.h"
  37
  38 #include "pipe/p_context.h"
  39
  40
  41 /**
  42  * This is used to initialize st->atoms[].
  43  */
  44 static const struct st_tracked_state *atoms[] =
  45 {
  46    &st_update_depth_stencil_alpha,
  47    &st_update_clip,
  48
  49    &st_finalize_textures,
  50    &st_update_fp,
  51    &st_update_vp,
  52
  53    &st_update_rasterizer,
  54    &st_update_polygon_stipple,
  55    &st_update_viewport,
  56    &st_update_scissor,
  57    &st_update_blend,
  58    &st_update_sampler,
  59    &st_update_texture,
  60    &st_update_framebuffer,
  61    &st_update_vs_constants,
  62    &st_update_fs_constants,
  63    &st_update_pixel_transfer
  64 };
  65
  66
  67 void st_init_atoms( struct st_context *st )
  68 {
  69    /* no-op */
  70 }
  71
  72
  73 void st_destroy_atoms( struct st_context *st )
  74 {
  75    /* no-op */
  76 }
  77
  78
  79 /***********************************************************************
  80  */
  81
  82 static GLboolean check_state( const struct st_state_flags *a,
  83                               const struct st_state_flags *b )
  84 {
  85    return ((a->mesa & b->mesa) ||
  86            (a->st & b->st));
  87 }
  88
  89 static void accumulate_state( struct st_state_flags *a,
  90                               const struct st_state_flags *b )
  91 {
  92    a->mesa |= b->mesa;
  93    a->st |= b->st;
  94 }
  95
  96
  97 static void xor_states( struct st_state_flags *result,
  98                              const struct st_state_flags *a,
  99                               const struct st_state_flags *b )
 100 {
 101    result->mesa = a->mesa ^ b->mesa;
 102    result->st = a->st ^ b->st;
 103 }
 104
 105
 106 /* Too complex to figure out, just check every time:
 107  */
 108 static void check_program_state( struct st_context *st )
 109 {
 110    GLcontext *ctx = st->ctx;
 111
 112    if (ctx->VertexProgram._Current != &st->vp->Base)
 113       st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
 114
 115    if (ctx->FragmentProgram._Current != &st->fp->Base)
 116       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 117
 118 }
 119
 120
 121 /***********************************************************************
 122  * Update all derived state:
 123  */
 124
 125 void st_validate_state( struct st_context *st )
 126 {
 127    struct st_state_flags *state = &st->dirty;
 128    GLuint i;
 129
 130    /* The bitmap cache is immune to pixel unpack changes.
 131     * Note that GLUT makes several calls to glPixelStore for each
 132     * bitmap char it draws so this is an important check.
 133     */
 134    if (state->mesa & ~_NEW_PACKUNPACK)
 135       st_flush_bitmap_cache(st);
 136
 137    check_program_state( st );
 138
 139    if (st->pipe->screen->update_buffer)
 140       st->pipe->screen->update_buffer(st->pipe->screen,
 141                                       st->pipe->priv);
 142
 143    if (state->st == 0)
 144       return;
 145
 146    /*printf("%s %x/%x\n", __FUNCTION__, state->mesa, state->st);*/
 147
 148    if (1) {
 149       /* Debug version which enforces various sanity checks on the
 150        * state flags which are generated and checked to help ensure
 151        * state atoms are ordered correctly in the list.
 152        */
 153       struct st_state_flags examined, prev;
 154       memset(&examined, 0, sizeof(examined));
 155       prev = *state;
 156
 157       for (i = 0; i < Elements(atoms); i++) {
 158          const struct st_tracked_state *atom = atoms[i];
 159          struct st_state_flags generated;
 160
 161          /*printf("atom %s %x/%x\n", atom->name, atom->dirty.mesa, atom->dirty.st);*/
 162
 163          if (!(atom->dirty.mesa || atom->dirty.st) ||
 164              !atom->update) {
 165             printf("malformed atom %s\n", atom->name);
 166             assert(0);
 167          }
 168
 169          if (check_state(state, &atom->dirty)) {
 170             atoms[i]->update( st );
 171             /*printf("after: %x\n", atom->dirty.mesa);*/
 172          }
 173
 174          accumulate_state(&examined, &atom->dirty);
 175
 176          /* generated = (prev ^ state)
 177           * if (examined & generated)
 178           *     fail;
 179           */
 180          xor_states(&generated, &prev, state);
 181          assert(!check_state(&examined, &generated));
 182          prev = *state;
 183       }
 184       /*printf("\n");*/
 185
 186    }
 187    else {
 188       for (i = 0; i < Elements(atoms); i++) {
 189          if (check_state(state, &atoms[i]->dirty))
 190             atoms[i]->update( st );
 191       }
 192    }
 193
 194    memset(state, 0, sizeof(*state));
 195 }
 196
 197
 198