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      1 /**********************************************************
      2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
      3  *
      4  * Permission is hereby granted, free of charge, to any person
      5  * obtaining a copy of this software and associated documentation
      6  * files (the "Software"), to deal in the Software without
      7  * restriction, including without limitation the rights to use, copy,
      8  * modify, merge, publish, distribute, sublicense, and/or sell copies
      9  * of the Software, and to permit persons to whom the Software is
     10  * furnished to do so, subject to the following conditions:
     11  *
     12  * The above copyright notice and this permission notice shall be
     13  * included in all copies or substantial portions of the Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     22  * SOFTWARE.
     23  *
     24  **********************************************************/
     25 
     26 #include "util/u_debug.h"
     27 #include "pipe/p_defines.h"
     28 #include "util/u_memory.h"
     29 #include "draw/draw_context.h"
     30 
     31 #include "svga_context.h"
     32 #include "svga_screen.h"
     33 #include "svga_state.h"
     34 #include "svga_draw.h"
     35 #include "svga_cmd.h"
     36 #include "svga_hw_reg.h"
     37 
     38 /* This is just enough to decide whether we need to use the draw
     39  * module (swtnl) or not.
     40  */
     41 static const struct svga_tracked_state *need_swtnl_state[] =
     42 {
     43    &svga_update_need_swvfetch,
     44    &svga_update_need_pipeline,
     45    &svga_update_need_swtnl,
     46    NULL
     47 };
     48 
     49 
     50 /* Atoms to update hardware state prior to emitting a clear or draw
     51  * packet.
     52  */
     53 static const struct svga_tracked_state *hw_clear_state[] =
     54 {
     55    &svga_hw_scissor,
     56    &svga_hw_viewport,
     57    &svga_hw_framebuffer,
     58    NULL
     59 };
     60 
     61 
     62 /* Atoms to update hardware state prior to emitting a draw packet.
     63  */
     64 static const struct svga_tracked_state *hw_draw_state[] =
     65 {
     66    &svga_hw_fs,
     67    &svga_hw_vs,
     68    &svga_hw_rss,
     69    &svga_hw_tss,
     70    &svga_hw_tss_binding,
     71    &svga_hw_clip_planes,
     72    &svga_hw_vdecl,
     73    &svga_hw_fs_constants,
     74    &svga_hw_vs_constants,
     75    NULL
     76 };
     77 
     78 
     79 static const struct svga_tracked_state *swtnl_draw_state[] =
     80 {
     81    &svga_update_swtnl_draw,
     82    &svga_update_swtnl_vdecl,
     83    NULL
     84 };
     85 
     86 /* Flattens the graph of state dependencies.  Could swap the positions
     87  * of hw_clear_state and need_swtnl_state without breaking anything.
     88  */
     89 static const struct svga_tracked_state **state_levels[] =
     90 {
     91    need_swtnl_state,
     92    hw_clear_state,
     93    hw_draw_state,
     94    swtnl_draw_state
     95 };
     96 
     97 
     98 
     99 static unsigned check_state( unsigned a,
    100                              unsigned b )
    101 {
    102    return (a & b);
    103 }
    104 
    105 static void accumulate_state( unsigned *a,
    106 			      unsigned b )
    107 {
    108    *a |= b;
    109 }
    110 
    111 
    112 static void xor_states( unsigned *result,
    113                         unsigned a,
    114                         unsigned b )
    115 {
    116    *result = a ^ b;
    117 }
    118 
    119 
    120 
    121 static enum pipe_error
    122 update_state(struct svga_context *svga,
    123              const struct svga_tracked_state *atoms[],
    124              unsigned *state)
    125 {
    126    boolean debug = TRUE;
    127    enum pipe_error ret = PIPE_OK;
    128    unsigned i;
    129 
    130    ret = svga_hwtnl_flush( svga->hwtnl );
    131    if (ret != PIPE_OK)
    132       return ret;
    133 
    134    if (debug) {
    135       /* Debug version which enforces various sanity checks on the
    136        * state flags which are generated and checked to help ensure
    137        * state atoms are ordered correctly in the list.
    138        */
    139       unsigned examined, prev;
    140 
    141       examined = 0;
    142       prev = *state;
    143 
    144       for (i = 0; atoms[i] != NULL; i++) {
    145 	 unsigned generated;
    146 
    147 	 assert(atoms[i]->dirty);
    148 	 assert(atoms[i]->update);
    149 
    150 	 if (check_state(*state, atoms[i]->dirty)) {
    151 	    if (0)
    152                debug_printf("update: %s\n", atoms[i]->name);
    153 	    ret = atoms[i]->update( svga, *state );
    154             if (ret != PIPE_OK)
    155                return ret;
    156 	 }
    157 
    158 	 /* generated = (prev ^ state)
    159 	  * if (examined & generated)
    160 	  *     fail;
    161 	  */
    162 	 xor_states(&generated, prev, *state);
    163 	 if (check_state(examined, generated)) {
    164 	    debug_printf("state atom %s generated state already examined\n",
    165                          atoms[i]->name);
    166 	    assert(0);
    167 	 }
    168 
    169 	 prev = *state;
    170 	 accumulate_state(&examined, atoms[i]->dirty);
    171       }
    172    }
    173    else {
    174       for (i = 0; atoms[i] != NULL; i++) {
    175 	 if (check_state(*state, atoms[i]->dirty)) {
    176 	    ret = atoms[i]->update( svga, *state );
    177             if (ret != PIPE_OK)
    178                return ret;
    179          }
    180       }
    181    }
    182 
    183    return PIPE_OK;
    184 }
    185 
    186 
    187 
    188 enum pipe_error
    189 svga_update_state(struct svga_context *svga, unsigned max_level)
    190 {
    191    struct svga_screen *screen = svga_screen(svga->pipe.screen);
    192    enum pipe_error ret = PIPE_OK;
    193    int i;
    194 
    195    /* Check for updates to bound textures.  This can't be done in an
    196     * atom as there is no flag which could provoke this test, and we
    197     * cannot create one.
    198     */
    199    if (svga->state.texture_timestamp != screen->texture_timestamp) {
    200       svga->state.texture_timestamp = screen->texture_timestamp;
    201       svga->dirty |= SVGA_NEW_TEXTURE;
    202    }
    203 
    204    for (i = 0; i <= max_level; i++) {
    205       svga->dirty |= svga->state.dirty[i];
    206 
    207       if (svga->dirty) {
    208          ret = update_state( svga,
    209                              state_levels[i],
    210                              &svga->dirty );
    211          if (ret != PIPE_OK)
    212             return ret;
    213 
    214          svga->state.dirty[i] = 0;
    215       }
    216    }
    217 
    218    for (; i < SVGA_STATE_MAX; i++)
    219       svga->state.dirty[i] |= svga->dirty;
    220 
    221    svga->dirty = 0;
    222    return PIPE_OK;
    223 }
    224 
    225 
    226 
    227 
    228 void svga_update_state_retry( struct svga_context *svga,
    229                               unsigned max_level )
    230 {
    231    enum pipe_error ret;
    232 
    233    ret = svga_update_state( svga, max_level );
    234 
    235    if (ret == PIPE_ERROR_OUT_OF_MEMORY) {
    236       svga_context_flush(svga, NULL);
    237       ret = svga_update_state( svga, max_level );
    238    }
    239 
    240    assert( ret == PIPE_OK );
    241 }
    242 
    243 
    244 
    245 #define EMIT_RS(_rs, _count, _name, _value)     \
    246 do {                                            \
    247    _rs[_count].state = _name;                   \
    248    _rs[_count].uintValue = _value;              \
    249    _count++;                                    \
    250 } while (0)
    251 
    252 
    253 /* Setup any hardware state which will be constant through the life of
    254  * a context.
    255  */
    256 enum pipe_error svga_emit_initial_state( struct svga_context *svga )
    257 {
    258    SVGA3dRenderState *rs;
    259    unsigned count = 0;
    260    const unsigned COUNT = 2;
    261    enum pipe_error ret;
    262 
    263    ret = SVGA3D_BeginSetRenderState( svga->swc, &rs, COUNT );
    264    if (ret != PIPE_OK)
    265       return ret;
    266 
    267    /* Always use D3D style coordinate space as this is the only one
    268     * which is implemented on all backends.
    269     */
    270    EMIT_RS(rs, count, SVGA3D_RS_COORDINATETYPE, SVGA3D_COORDINATE_LEFTHANDED );
    271    EMIT_RS(rs, count, SVGA3D_RS_FRONTWINDING, SVGA3D_FRONTWINDING_CW );
    272 
    273    assert( COUNT == count );
    274    SVGA_FIFOCommitAll( svga->swc );
    275 
    276    return PIPE_OK;
    277 }
    278