src/mesa/drivers/dri/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 "glheader.h"
  33 #include "macros.h"
  34 #include "enums.h"
  35
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "brw_util.h"
  42 #include "brw_state.h"
  43 #include "brw_gs.h"
  44
  45
  46
  47 static void compile_gs_prog( struct brw_context *brw,
  48                              struct brw_gs_prog_key *key )
  49 {
  50    struct brw_gs_compile c;
  51    const GLuint *program;
  52    GLuint program_size;
  53
  54    memset(&c, 0, sizeof(c));
  55
  56    c.key = *key;
  57
  58    /* Need to locate the two positions present in vertex + header.
  59     * These are currently hardcoded:
  60     */
  61    c.nr_attrs = brw_count_bits(c.key.attrs);
  62    c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  63    c.nr_bytes = c.nr_regs * REG_SIZE;
  64
  65
  66    /* Begin the compilation:
  67     */
  68    brw_init_compile(&c.func);
  69
  70    c.func.single_program_flow = 1;
  71
  72    /* For some reason the thread is spawned with only 4 channels
  73     * unmasked.
  74     */
  75    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  76
  77
  78    /* Note that primitives which don't require a GS program have
  79     * already been weeded out by this stage:
  80     */
  81    switch (key->primitive) {
  82    case GL_QUADS:
  83       brw_gs_quads( &c );
  84       break;
  85    case GL_QUAD_STRIP:
  86       brw_gs_quad_strip( &c );
  87       break;
  88    case GL_LINE_LOOP:
  89       brw_gs_lines( &c );
  90       break;
  91    case GL_LINES:
  92       if (key->hint_gs_always)
  93          brw_gs_lines( &c );
  94       else {
  95          return;
  96       }
  97       break;
  98    case GL_TRIANGLES:
  99       if (key->hint_gs_always)
 100          brw_gs_tris( &c );
 101       else {
 102          return;
 103       }
 104       break;
 105    case GL_POINTS:
 106       if (key->hint_gs_always)
 107          brw_gs_points( &c );
 108       else {
 109          return;
 110       }
 111       break;
 112    default:
 113       return;
 114    }
 115
 116    /* get the program
 117     */
 118    program = brw_get_program(&c.func, &program_size);
 119
 120    /* Upload
 121     */
 122    brw->gs.prog_gs_offset = brw_upload_cache( &brw->cache[BRW_GS_PROG],
 123                                               &c.key,
 124                                               sizeof(c.key),
 125                                               program,
 126                                               program_size,
 127                                               &c.prog_data,
 128                                               &brw->gs.prog_data );
 129 }
 130
 131
 132 static GLboolean search_cache( struct brw_context *brw,
 133                                struct brw_gs_prog_key *key )
 134 {
 135    return brw_search_cache(&brw->cache[BRW_GS_PROG],
 136                            key, sizeof(*key),
 137                            &brw->gs.prog_data,
 138                            &brw->gs.prog_gs_offset);
 139 }
 140
 141
 142 static const GLenum gs_prim[GL_POLYGON+1] = {
 143    GL_POINTS,
 144    GL_LINES,
 145    GL_LINE_LOOP,
 146    GL_LINES,
 147    GL_TRIANGLES,
 148    GL_TRIANGLES,
 149    GL_TRIANGLES,
 150    GL_QUADS,
 151    GL_QUAD_STRIP,
 152    GL_TRIANGLES
 153 };
 154
 155 static void populate_key( struct brw_context *brw,
 156                           struct brw_gs_prog_key *key )
 157 {
 158    memset(key, 0, sizeof(*key));
 159
 160    /* CACHE_NEW_VS_PROG */
 161    key->attrs = brw->vs.prog_data->outputs_written;
 162
 163    /* BRW_NEW_PRIMITIVE */
 164    key->primitive = gs_prim[brw->primitive];
 165
 166    key->hint_gs_always = 0;     /* debug code? */
 167
 168    key->need_gs_prog = (key->hint_gs_always ||
 169                         brw->primitive == GL_QUADS ||
 170                         brw->primitive == GL_QUAD_STRIP ||
 171                         brw->primitive == GL_LINE_LOOP);
 172 }
 173
 174 /* Calculate interpolants for triangle and line rasterization.
 175  */
 176 static void upload_gs_prog( struct brw_context *brw )
 177 {
 178    struct brw_gs_prog_key key;
 179
 180    /* Populate the key:
 181     */
 182    populate_key(brw, &key);
 183
 184    if (brw->gs.prog_active != key.need_gs_prog) {
 185       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 186       brw->gs.prog_active = key.need_gs_prog;
 187    }
 188
 189    if (brw->gs.prog_active) {
 190       if (!search_cache(brw, &key))
 191          compile_gs_prog( brw, &key );
 192    }
 193 }
 194
 195
 196 const struct brw_tracked_state brw_gs_prog = {
 197    .dirty = {
 198       .mesa  = 0,
 199       .brw   = BRW_NEW_PRIMITIVE,
 200       .cache = CACHE_NEW_VS_PROG
 201    },
 202    .update = upload_gs_prog
 203 };