src/gallium/drivers/i965/brw_gs.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "brw_batchbuffer.h"
  33
  34 #include "brw_defines.h"
  35 #include "brw_context.h"
  36 #include "brw_eu.h"
  37 #include "brw_util.h"
  38 #include "brw_state.h"
  39 #include "brw_gs.h"
  40
  41
  42
  43 static enum pipe_error compile_gs_prog( struct brw_context *brw,
  44                                         struct brw_gs_prog_key *key,
  45                                         struct brw_winsys_buffer **bo_out )
  46 {
  47    struct brw_gs_compile c;
  48    enum pipe_error ret;
  49    const GLuint *program;
  50    GLuint program_size;
  51
  52    memset(&c, 0, sizeof(c));
  53
  54    c.key = *key;
  55    c.need_ff_sync = BRW_IS_IGDNG(brw);
  56    /* Need to locate the two positions present in vertex + header.
  57     * These are currently hardcoded:
  58     */
  59    c.nr_attrs = c.key.nr_attrs;
  60
  61    if (BRW_IS_IGDNG(brw))
  62       c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  63    else
  64       c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  65
  66    c.nr_bytes = c.nr_regs * REG_SIZE;
  67
  68
  69    /* Begin the compilation:
  70     */
  71    brw_init_compile(brw, &c.func);
  72
  73    c.func.single_program_flow = 1;
  74
  75    /* For some reason the thread is spawned with only 4 channels
  76     * unmasked.
  77     */
  78    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  79
  80
  81    /* Note that primitives which don't require a GS program have
  82     * already been weeded out by this stage:
  83     */
  84    switch (key->primitive) {
  85    case PIPE_PRIM_QUADS:
  86       brw_gs_quads( &c );
  87       break;
  88    case PIPE_PRIM_QUAD_STRIP:
  89       brw_gs_quad_strip( &c );
  90       break;
  91    case PIPE_PRIM_LINE_LOOP:
  92       brw_gs_lines( &c );
  93       break;
  94    case PIPE_PRIM_LINES:
  95       if (key->hint_gs_always)
  96          brw_gs_lines( &c );
  97       else {
  98          return PIPE_OK;
  99       }
 100       break;
 101    case PIPE_PRIM_TRIANGLES:
 102       if (key->hint_gs_always)
 103          brw_gs_tris( &c );
 104       else {
 105          return PIPE_OK;
 106       }
 107       break;
 108    case PIPE_PRIM_POINTS:
 109       if (key->hint_gs_always)
 110          brw_gs_points( &c );
 111       else {
 112          return PIPE_OK;
 113       }
 114       break;
 115    default:
 116       assert(0);
 117       return PIPE_ERROR_BAD_INPUT;
 118    }
 119
 120    /* get the program
 121     */
 122    ret = brw_get_program(&c.func, &program, &program_size);
 123    if (ret)
 124       return ret;
 125
 126    /* Upload
 127     */
 128    ret = brw_upload_cache( &brw->cache, BRW_GS_PROG,
 129                            &c.key, sizeof(c.key),
 130                            NULL, 0,
 131                            program, program_size,
 132                            &c.prog_data,
 133                            &brw->gs.prog_data,
 134                            bo_out );
 135    if (ret)
 136       return ret;
 137
 138    return PIPE_OK;
 139 }
 140
 141 static const unsigned gs_prim[PIPE_PRIM_MAX] = {
 142    PIPE_PRIM_POINTS,
 143    PIPE_PRIM_LINES,
 144    PIPE_PRIM_LINE_LOOP,
 145    PIPE_PRIM_LINES,
 146    PIPE_PRIM_TRIANGLES,
 147    PIPE_PRIM_TRIANGLES,
 148    PIPE_PRIM_TRIANGLES,
 149    PIPE_PRIM_QUADS,
 150    PIPE_PRIM_QUAD_STRIP,
 151    PIPE_PRIM_TRIANGLES
 152 };
 153
 154 static void populate_key( struct brw_context *brw,
 155                           struct brw_gs_prog_key *key )
 156 {
 157    const struct brw_fs_signature *sig = &brw->curr.fragment_shader->signature;
 158
 159    memset(key, 0, sizeof(*key));
 160
 161    /* PIPE_NEW_FRAGMENT_SIGNATURE */
 162    key->nr_attrs = sig->nr_inputs + 1;
 163
 164    /* BRW_NEW_PRIMITIVE */
 165    key->primitive = gs_prim[brw->primitive];
 166
 167    key->hint_gs_always = 0;     /* debug code? */
 168
 169    key->need_gs_prog = (key->hint_gs_always ||
 170                         brw->primitive == PIPE_PRIM_QUADS ||
 171                         brw->primitive == PIPE_PRIM_QUAD_STRIP ||
 172                         brw->primitive == PIPE_PRIM_LINE_LOOP);
 173 }
 174
 175 /* Calculate interpolants for triangle and line rasterization.
 176  */
 177 static int prepare_gs_prog(struct brw_context *brw)
 178 {
 179    struct brw_gs_prog_key key;
 180    enum pipe_error ret;
 181
 182    /* Populate the key:
 183     */
 184    populate_key(brw, &key);
 185
 186    if (brw->gs.prog_active != key.need_gs_prog) {
 187       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 188       brw->gs.prog_active = key.need_gs_prog;
 189    }
 190
 191    if (!brw->gs.prog_active)
 192       return PIPE_OK;
 193
 194    if (brw_search_cache(&brw->cache, BRW_GS_PROG,
 195                         &key, sizeof(key),
 196                         NULL, 0,
 197                         &brw->gs.prog_data,
 198                         &brw->gs.prog_bo))
 199       return PIPE_OK;
 200
 201    ret = compile_gs_prog( brw, &key, &brw->gs.prog_bo );
 202    if (ret)
 203       return ret;
 204
 205    return PIPE_OK;
 206 }
 207
 208
 209 const struct brw_tracked_state brw_gs_prog = {
 210    .dirty = {
 211       .mesa  = PIPE_NEW_FRAGMENT_SIGNATURE,
 212       .brw   = BRW_NEW_PRIMITIVE,
 213       .cache = 0,
 214    },
 215    .prepare = prepare_gs_prog
 216 };