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 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(brw, &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    dri_bo_unreference(brw->gs.prog_bo);
 123    brw->gs.prog_bo = brw_upload_cache( &brw->cache, BRW_GS_PROG,
 124                                        &c.key, sizeof(c.key),
 125                                        NULL, 0,
 126                                        program, program_size,
 127                                        &c.prog_data,
 128                                        &brw->gs.prog_data );
 129 }
 130
 131 static const GLenum gs_prim[GL_POLYGON+1] = {
 132    GL_POINTS,
 133    GL_LINES,
 134    GL_LINE_LOOP,
 135    GL_LINES,
 136    GL_TRIANGLES,
 137    GL_TRIANGLES,
 138    GL_TRIANGLES,
 139    GL_QUADS,
 140    GL_QUAD_STRIP,
 141    GL_TRIANGLES
 142 };
 143
 144 static void populate_key( struct brw_context *brw,
 145                           struct brw_gs_prog_key *key )
 146 {
 147    memset(key, 0, sizeof(*key));
 148
 149    /* CACHE_NEW_VS_PROG */
 150    key->attrs = brw->vs.prog_data->outputs_written;
 151
 152    /* BRW_NEW_PRIMITIVE */
 153    key->primitive = gs_prim[brw->primitive];
 154
 155    key->hint_gs_always = 0;     /* debug code? */
 156
 157    key->need_gs_prog = (key->hint_gs_always ||
 158                         brw->primitive == GL_QUADS ||
 159                         brw->primitive == GL_QUAD_STRIP ||
 160                         brw->primitive == GL_LINE_LOOP);
 161 }
 162
 163 /* Calculate interpolants for triangle and line rasterization.
 164  */
 165 static void prepare_gs_prog(struct brw_context *brw)
 166 {
 167    struct brw_gs_prog_key key;
 168    /* Populate the key:
 169     */
 170    populate_key(brw, &key);
 171
 172    if (brw->gs.prog_active != key.need_gs_prog) {
 173       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 174       brw->gs.prog_active = key.need_gs_prog;
 175    }
 176
 177    if (brw->gs.prog_active) {
 178       dri_bo_unreference(brw->gs.prog_bo);
 179       brw->gs.prog_bo = brw_search_cache(&brw->cache, BRW_GS_PROG,
 180                                          &key, sizeof(key),
 181                                          NULL, 0,
 182                                          &brw->gs.prog_data);
 183       if (brw->gs.prog_bo == NULL)
 184          compile_gs_prog( brw, &key );
 185    }
 186 }
 187
 188
 189 const struct brw_tracked_state brw_gs_prog = {
 190    .dirty = {
 191       .mesa  = 0,
 192       .brw   = BRW_NEW_PRIMITIVE,
 193       .cache = CACHE_NEW_VS_PROG
 194    },
 195    .prepare = prepare_gs_prog
 196 };