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_depth_stencil_alpha,
  49    &st_update_clip,
  50
  51    &st_update_shader,
  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_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    GLuint i;
  69
  70    st->atoms = malloc(sizeof(atoms));
  71    st->nr_atoms = sizeof(atoms)/sizeof(*atoms);
  72    memcpy(st->atoms, atoms, sizeof(atoms));
  73
  74    /* Patch in a pointer to the dynamic state atom:
  75     */
  76    for (i = 0; i < st->nr_atoms; i++) {
  77       if (st->atoms[i] == &st_update_vs_constants) {
  78          st->atoms[i] = &st->constants.tracked_state[PIPE_SHADER_VERTEX];
  79          st->atoms[i][0] = st_update_vs_constants;
  80       }
  81
  82       if (st->atoms[i] == &st_update_fs_constants) {
  83          st->atoms[i] = &st->constants.tracked_state[PIPE_SHADER_FRAGMENT];
  84          st->atoms[i][0] = st_update_fs_constants;
  85       }
  86    }
  87 }
  88
  89
  90 void st_destroy_atoms( struct st_context *st )
  91 {
  92    if (st->atoms) {
  93       free(st->atoms);
  94       st->atoms = NULL;
  95    }
  96 }
  97
  98
  99 /***********************************************************************
 100  */
 101
 102 static GLboolean check_state( const struct st_state_flags *a,
 103                               const struct st_state_flags *b )
 104 {
 105    return ((a->mesa & b->mesa) ||
 106            (a->st & b->st));
 107 }
 108
 109 static void accumulate_state( struct st_state_flags *a,
 110                               const struct st_state_flags *b )
 111 {
 112    a->mesa |= b->mesa;
 113    a->st |= b->st;
 114 }
 115
 116
 117 static void xor_states( struct st_state_flags *result,
 118                              const struct st_state_flags *a,
 119                               const struct st_state_flags *b )
 120 {
 121    result->mesa = a->mesa ^ b->mesa;
 122    result->st = a->st ^ b->st;
 123 }
 124
 125
 126 /* Too complex to figure out, just check every time:
 127  */
 128 static void check_program_state( struct st_context *st )
 129 {
 130    GLcontext *ctx = st->ctx;
 131
 132    if (ctx->VertexProgram._Current != &st->vp->Base)
 133       st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
 134
 135    if (ctx->FragmentProgram._Current != &st->fp->Base)
 136       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 137
 138 }
 139
 140
 141 /***********************************************************************
 142  * Update all derived state:
 143  */
 144
 145 void st_validate_state( struct st_context *st )
 146 {
 147    struct st_state_flags *state = &st->dirty;
 148    GLuint i;
 149
 150    check_program_state( st );
 151
 152    if (state->st == 0)
 153       return;
 154
 155 //   _mesa_printf("%s %x/%x\n", __FUNCTION__, state->mesa, state->st);
 156
 157    if (1) {
 158       /* Debug version which enforces various sanity checks on the
 159        * state flags which are generated and checked to help ensure
 160        * state atoms are ordered correctly in the list.
 161        */
 162       struct st_state_flags examined, prev;
 163       memset(&examined, 0, sizeof(examined));
 164       prev = *state;
 165
 166       for (i = 0; i < st->nr_atoms; i++) {
 167          const struct st_tracked_state *atom = st->atoms[i];
 168          struct st_state_flags generated;
 169
 170 //       _mesa_printf("atom %s %x/%x\n", atom->name, atom->dirty.mesa, atom->dirty.st);
 171
 172          if (!(atom->dirty.mesa || atom->dirty.st) ||
 173              !atom->update) {
 174             _mesa_printf("malformed atom %s\n", atom->name);
 175             assert(0);
 176          }
 177
 178          if (check_state(state, &atom->dirty)) {
 179             st->atoms[i]->update( st );
 180 //          _mesa_printf("after: %x\n", atom->dirty.mesa);
 181          }
 182
 183          accumulate_state(&examined, &atom->dirty);
 184
 185          /* generated = (prev ^ state)
 186           * if (examined & generated)
 187           *     fail;
 188           */
 189          xor_states(&generated, &prev, state);
 190          assert(!check_state(&examined, &generated));
 191          prev = *state;
 192       }
 193 //      _mesa_printf("\n");
 194
 195    }
 196    else {
 197       const GLuint nr = st->nr_atoms;
 198
 199       for (i = 0; i < nr; i++) {
 200          if (check_state(state, &st->atoms[i]->dirty))
 201             st->atoms[i]->update( st );
 202       }
 203    }
 204
 205    memset(state, 0, sizeof(*state));
 206 }
 207
 208
 209