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