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