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 void compile_gs_prog( struct brw_context *brw,
  44                              struct brw_gs_prog_key *key )
  45 {
  46    struct brw_gs_compile c;
  47    const GLuint *program;
  48    GLuint program_size;
  49
  50    memset(&c, 0, sizeof(c));
  51
  52    c.key = *key;
  53    c.need_ff_sync = BRW_IS_IGDNG(brw);
  54    /* Need to locate the two positions present in vertex + header.
  55     * These are currently hardcoded:
  56     */
  57    c.nr_attrs = util_count_bits(c.key.attrs);
  58
  59    if (BRW_IS_IGDNG(brw))
  60        c.nr_regs = (c.nr_attrs + 1) / 2 + 3;  /* are vertices packed, or reg-aligned? */
  61    else
  62        c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  63
  64    c.nr_bytes = c.nr_regs * REG_SIZE;
  65
  66
  67    /* Begin the compilation:
  68     */
  69    brw_init_compile(brw, &c.func);
  70
  71    c.func.single_program_flow = 1;
  72
  73    /* For some reason the thread is spawned with only 4 channels
  74     * unmasked.
  75     */
  76    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  77
  78
  79    /* Note that primitives which don't require a GS program have
  80     * already been weeded out by this stage:
  81     */
  82    switch (key->primitive) {
  83    case GL_QUADS:
  84       brw_gs_quads( &c );
  85       break;
  86    case GL_QUAD_STRIP:
  87       brw_gs_quad_strip( &c );
  88       break;
  89    case GL_LINE_LOOP:
  90       brw_gs_lines( &c );
  91       break;
  92    case GL_LINES:
  93       if (key->hint_gs_always)
  94          brw_gs_lines( &c );
  95       else {
  96          return;
  97       }
  98       break;
  99    case GL_TRIANGLES:
 100       if (key->hint_gs_always)
 101          brw_gs_tris( &c );
 102       else {
 103          return;
 104       }
 105       break;
 106    case GL_POINTS:
 107       if (key->hint_gs_always)
 108          brw_gs_points( &c );
 109       else {
 110          return;
 111       }
 112       break;
 113    default:
 114       return;
 115    }
 116
 117    /* get the program
 118     */
 119    program = brw_get_program(&c.func, &program_size);
 120
 121    /* Upload
 122     */
 123    brw->sws->bo_unreference(brw->gs.prog_bo);
 124    brw->gs.prog_bo = brw_upload_cache( &brw->cache, BRW_GS_PROG,
 125                                        &c.key, sizeof(c.key),
 126                                        NULL, 0,
 127                                        program, program_size,
 128                                        &c.prog_data,
 129                                        &brw->gs.prog_data );
 130 }
 131
 132 static const GLenum gs_prim[GL_POLYGON+1] = {
 133    GL_POINTS,
 134    GL_LINES,
 135    GL_LINE_LOOP,
 136    GL_LINES,
 137    GL_TRIANGLES,
 138    GL_TRIANGLES,
 139    GL_TRIANGLES,
 140    GL_QUADS,
 141    GL_QUAD_STRIP,
 142    GL_TRIANGLES
 143 };
 144
 145 static void populate_key( struct brw_context *brw,
 146                           struct brw_gs_prog_key *key )
 147 {
 148    memset(key, 0, sizeof(*key));
 149
 150    /* CACHE_NEW_VS_PROG */
 151    key->attrs = brw->vs.prog_data->outputs_written;
 152
 153    /* BRW_NEW_PRIMITIVE */
 154    key->primitive = gs_prim[brw->primitive];
 155
 156    key->hint_gs_always = 0;     /* debug code? */
 157
 158    key->need_gs_prog = (key->hint_gs_always ||
 159                         brw->primitive == GL_QUADS ||
 160                         brw->primitive == GL_QUAD_STRIP ||
 161                         brw->primitive == GL_LINE_LOOP);
 162 }
 163
 164 /* Calculate interpolants for triangle and line rasterization.
 165  */
 166 static void prepare_gs_prog(struct brw_context *brw)
 167 {
 168    struct brw_gs_prog_key key;
 169    /* Populate the key:
 170     */
 171    populate_key(brw, &key);
 172
 173    if (brw->gs.prog_active != key.need_gs_prog) {
 174       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 175       brw->gs.prog_active = key.need_gs_prog;
 176    }
 177
 178    if (brw->gs.prog_active) {
 179       brw->sws->bo_unreference(brw->gs.prog_bo);
 180       brw->gs.prog_bo = brw_search_cache(&brw->cache, BRW_GS_PROG,
 181                                          &key, sizeof(key),
 182                                          NULL, 0,
 183                                          &brw->gs.prog_data);
 184       if (brw->gs.prog_bo == NULL)
 185          compile_gs_prog( brw, &key );
 186    }
 187 }
 188
 189
 190 const struct brw_tracked_state brw_gs_prog = {
 191    .dirty = {
 192       .mesa  = 0,
 193       .brw   = BRW_NEW_PRIMITIVE,
 194       .cache = CACHE_NEW_VS_PROG
 195    },
 196    .prepare = prepare_gs_prog
 197 };