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 /* This is used to initialize st->atoms[].  We could use this list
  41  * directly except for a single atom, st_update_constants, which has a
  42  * .dirty value which changes according to the parameters of the
  43  * current fragment and vertex programs, and so cannot be a static
  44  * value.
  45  */
  46 static const struct st_tracked_state *atoms[] =
  47 {
  48    &st_update_depth_stencil_alpha,
  49    &st_update_clip,
  50
  51    &st_finalize_textures,
  52    &st_update_shader,
  53
  54    &st_update_rasterizer,
  55    &st_update_polygon_stipple,
  56    &st_update_viewport,
  57    &st_update_scissor,
  58    &st_update_blend,
  59    &st_update_sampler,
  60    &st_update_texture,
  61    &st_update_framebuffer,
  62    &st_update_vs_constants,
  63    &st_update_fs_constants,
  64    &st_update_pixel_transfer
  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    /* The bitmap cache is immune to pixel unpack changes.
 153     * Note that GLUT makes several calls to glPixelStore for each
 154     * bitmap char it draws so this is an important check.
 155     */
 156    if (state->mesa & ~_NEW_PACKUNPACK)
 157       st_flush_bitmap_cache(st);
 158
 159    check_program_state( st );
 160
 161    if (state->st == 0)
 162       return;
 163
 164 //   _mesa_printf("%s %x/%x\n", __FUNCTION__, state->mesa, state->st);
 165
 166    if (1) {
 167       /* Debug version which enforces various sanity checks on the
 168        * state flags which are generated and checked to help ensure
 169        * state atoms are ordered correctly in the list.
 170        */
 171       struct st_state_flags examined, prev;
 172       memset(&examined, 0, sizeof(examined));
 173       prev = *state;
 174
 175       for (i = 0; i < st->nr_atoms; i++) {
 176          const struct st_tracked_state *atom = st->atoms[i];
 177          struct st_state_flags generated;
 178
 179 //       _mesa_printf("atom %s %x/%x\n", atom->name, atom->dirty.mesa, atom->dirty.st);
 180
 181          if (!(atom->dirty.mesa || atom->dirty.st) ||
 182              !atom->update) {
 183             _mesa_printf("malformed atom %s\n", atom->name);
 184             assert(0);
 185          }
 186
 187          if (check_state(state, &atom->dirty)) {
 188             st->atoms[i]->update( st );
 189 //          _mesa_printf("after: %x\n", atom->dirty.mesa);
 190          }
 191
 192          accumulate_state(&examined, &atom->dirty);
 193
 194          /* generated = (prev ^ state)
 195           * if (examined & generated)
 196           *     fail;
 197           */
 198          xor_states(&generated, &prev, state);
 199          assert(!check_state(&examined, &generated));
 200          prev = *state;
 201       }
 202 //      _mesa_printf("\n");
 203
 204    }
 205    else {
 206       const GLuint nr = st->nr_atoms;
 207
 208       for (i = 0; i < nr; i++) {
 209          if (check_state(state, &st->atoms[i]->dirty))
 210             st->atoms[i]->update( st );
 211       }
 212    }
 213
 214    memset(state, 0, sizeof(*state));
 215 }
 216
 217
 218