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_LINE_LOOP:
  86       brw_gs_lines( &c );
  87       break;
  88    case GL_LINES:
  89       if (key->hint_gs_always)
  90          brw_gs_lines( &c );
  91       else {
  92          return;
  93       }
  94       break;
  95    case GL_TRIANGLES:
  96       if (key->hint_gs_always)
  97          brw_gs_tris( &c );
  98       else {
  99          return;
 100       }
 101       break;
 102    case GL_POINTS:
 103       if (key->hint_gs_always)
 104          brw_gs_points( &c );
 105       else {
 106          return;
 107       }
 108       break;
 109    default:
 110       return;
 111    }
 112
 113    /* get the program
 114     */
 115    program = brw_get_program(&c.func, &program_size);
 116
 117    /* Upload
 118     */
 119    brw->gs.prog_gs_offset = brw_upload_cache( &brw->cache[BRW_GS_PROG],
 120                                               &c.key,
 121                                               sizeof(c.key),
 122                                               program,
 123                                               program_size,
 124                                               &c.prog_data,
 125                                               &brw->gs.prog_data );
 126 }
 127
 128
 129 static GLboolean search_cache( struct brw_context *brw,
 130                                struct brw_gs_prog_key *key )
 131 {
 132    return brw_search_cache(&brw->cache[BRW_GS_PROG],
 133                            key, sizeof(*key),
 134                            &brw->gs.prog_data,
 135                            &brw->gs.prog_gs_offset);
 136 }
 137
 138
 139 static const GLenum gs_prim[GL_POLYGON+1] = {
 140    GL_POINTS,
 141    GL_LINES,
 142    GL_LINE_LOOP,
 143    GL_LINES,
 144    GL_TRIANGLES,
 145    GL_TRIANGLES,
 146    GL_TRIANGLES,
 147    GL_QUADS,
 148    GL_QUADS,
 149    GL_TRIANGLES
 150 };
 151
 152 static void populate_key( struct brw_context *brw,
 153                           struct brw_gs_prog_key *key )
 154 {
 155    memset(key, 0, sizeof(*key));
 156
 157    /* CACHE_NEW_VS_PROG */
 158    key->attrs = brw->vs.prog_data->outputs_written;
 159
 160    /* BRW_NEW_PRIMITIVE */
 161    key->primitive = gs_prim[brw->primitive];
 162
 163    key->hint_gs_always = 0;     /* debug code? */
 164
 165    key->need_gs_prog = (key->hint_gs_always ||
 166                         brw->primitive == GL_QUADS ||
 167                         brw->primitive == GL_QUAD_STRIP ||
 168                         brw->primitive == GL_LINE_LOOP);
 169 }
 170
 171 /* Calculate interpolants for triangle and line rasterization.
 172  */
 173 static void upload_gs_prog( struct brw_context *brw )
 174 {
 175    struct brw_gs_prog_key key;
 176
 177    /* Populate the key:
 178     */
 179    populate_key(brw, &key);
 180
 181    if (brw->gs.prog_active != key.need_gs_prog) {
 182       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 183       brw->gs.prog_active = key.need_gs_prog;
 184    }
 185
 186    if (brw->gs.prog_active) {
 187       if (!search_cache(brw, &key))
 188          compile_gs_prog( brw, &key );
 189    }
 190 }
 191
 192
 193 const struct brw_tracked_state brw_gs_prog = {
 194    .dirty = {
 195       .mesa  = 0,
 196       .brw   = BRW_NEW_PRIMITIVE,
 197       .cache = CACHE_NEW_VS_PROG
 198    },
 199    .update = upload_gs_prog
 200 };