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 "main/glheader.h"
  33 #include "main/macros.h"
  34 #include "main/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 intel_context *intel = &brw->intel;
  51    struct brw_gs_compile c;
  52    const GLuint *program;
  53    GLuint program_size;
  54
  55    memset(&c, 0, sizeof(c));
  56
  57    c.key = *key;
  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
  63    if (intel->is_ironlake)
  64        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  65    else
  66        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  67
  68    c.nr_bytes = c.nr_regs * REG_SIZE;
  69
  70
  71    /* Begin the compilation:
  72     */
  73    brw_init_compile(brw, &c.func);
  74
  75    c.func.single_program_flow = 1;
  76
  77    /* For some reason the thread is spawned with only 4 channels
  78     * unmasked.
  79     */
  80    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  81
  82
  83    /* Note that primitives which don't require a GS program have
  84     * already been weeded out by this stage:
  85     */
  86    switch (key->primitive) {
  87    case GL_QUADS:
  88       brw_gs_quads( &c, key );
  89       break;
  90    case GL_QUAD_STRIP:
  91       brw_gs_quad_strip( &c, key );
  92       break;
  93    case GL_LINE_LOOP:
  94       brw_gs_lines( &c );
  95       break;
  96    case GL_LINES:
  97       if (key->hint_gs_always)
  98          brw_gs_lines( &c );
  99       else {
 100          return;
 101       }
 102       break;
 103    case GL_TRIANGLES:
 104       if (key->hint_gs_always)
 105          brw_gs_tris( &c );
 106       else {
 107          return;
 108       }
 109       break;
 110    case GL_POINTS:
 111       if (key->hint_gs_always)
 112          brw_gs_points( &c );
 113       else {
 114          return;
 115       }
 116       break;
 117    default:
 118       return;
 119    }
 120
 121    /* get the program
 122     */
 123    program = brw_get_program(&c.func, &program_size);
 124
 125    /* Upload
 126     */
 127    dri_bo_unreference(brw->gs.prog_bo);
 128    brw->gs.prog_bo = brw_upload_cache_with_auxdata(&brw->cache, BRW_GS_PROG,
 129                                                    &c.key, sizeof(c.key),
 130                                                    NULL, 0,
 131                                                    program, program_size,
 132                                                    &c.prog_data,
 133                                                    sizeof(c.prog_data),
 134                                                    &brw->gs.prog_data);
 135 }
 136
 137 static const GLenum gs_prim[GL_POLYGON+1] = {
 138    GL_POINTS,
 139    GL_LINES,
 140    GL_LINE_LOOP,
 141    GL_LINES,
 142    GL_TRIANGLES,
 143    GL_TRIANGLES,
 144    GL_TRIANGLES,
 145    GL_QUADS,
 146    GL_QUAD_STRIP,
 147    GL_TRIANGLES
 148 };
 149
 150 static void populate_key( struct brw_context *brw,
 151                           struct brw_gs_prog_key *key )
 152 {
 153    GLcontext *ctx = &brw->intel.ctx;
 154    memset(key, 0, sizeof(*key));
 155
 156    /* CACHE_NEW_VS_PROG */
 157    key->attrs = brw->vs.prog_data->outputs_written;
 158
 159    /* BRW_NEW_PRIMITIVE */
 160    key->primitive = gs_prim[brw->primitive];
 161
 162    key->hint_gs_always = 0;     /* debug code? */
 163
 164    /* _NEW_LIGHT */
 165    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 166
 167    key->need_gs_prog = (key->hint_gs_always ||
 168                         brw->primitive == GL_QUADS ||
 169                         brw->primitive == GL_QUAD_STRIP ||
 170                         brw->primitive == GL_LINE_LOOP);
 171 }
 172
 173 /* Calculate interpolants for triangle and line rasterization.
 174  */
 175 static void prepare_gs_prog(struct brw_context *brw)
 176 {
 177    struct brw_gs_prog_key key;
 178    /* Populate the key:
 179     */
 180    populate_key(brw, &key);
 181
 182    if (brw->gs.prog_active != key.need_gs_prog) {
 183       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 184       brw->gs.prog_active = key.need_gs_prog;
 185    }
 186
 187    if (brw->gs.prog_active) {
 188       dri_bo_unreference(brw->gs.prog_bo);
 189       brw->gs.prog_bo = brw_search_cache(&brw->cache, BRW_GS_PROG,
 190                                          &key, sizeof(key),
 191                                          NULL, 0,
 192                                          &brw->gs.prog_data);
 193       if (brw->gs.prog_bo == NULL)
 194          compile_gs_prog( brw, &key );
 195    }
 196 }
 197
 198
 199 const struct brw_tracked_state brw_gs_prog = {
 200    .dirty = {
 201       .mesa  = _NEW_LIGHT,
 202       .brw   = BRW_NEW_PRIMITIVE,
 203       .cache = CACHE_NEW_VS_PROG
 204    },
 205    .prepare = prepare_gs_prog
 206 };