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 #include "glsl/ralloc.h"
  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    void *mem_ctx;
  54    GLuint program_size;
  55
  56    /* Gen6: VF has already converted into polygon, and LINELOOP is
  57     * converted to LINESTRIP at the beginning of the 3D pipeline.
  58     */
  59    if (intel->gen >= 6)
  60       return;
  61
  62    memset(&c, 0, sizeof(c));
  63
  64    c.key = *key;
  65    /* The geometry shader needs to access the entire VUE. */
  66    struct brw_vue_map vue_map;
  67    brw_compute_vue_map(&vue_map, intel, c.key.userclip_active, c.key.attrs);
  68    c.nr_regs = (vue_map.num_slots + 1)/2;
  69
  70    mem_ctx = NULL;
  71
  72    /* Begin the compilation:
  73     */
  74    brw_init_compile(brw, &c.func, mem_ctx);
  75
  76    c.func.single_program_flow = 1;
  77
  78    /* For some reason the thread is spawned with only 4 channels
  79     * unmasked.
  80     */
  81    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  82
  83
  84    /* Note that primitives which don't require a GS program have
  85     * already been weeded out by this stage:
  86     */
  87
  88    switch (key->primitive) {
  89    case _3DPRIM_QUADLIST:
  90       brw_gs_quads( &c, key );
  91       break;
  92    case _3DPRIM_QUADSTRIP:
  93       brw_gs_quad_strip( &c, key );
  94       break;
  95    case _3DPRIM_LINELOOP:
  96       brw_gs_lines( &c );
  97       break;
  98    default:
  99       ralloc_free(mem_ctx);
 100       return;
 101    }
 102
 103    /* get the program
 104     */
 105    program = brw_get_program(&c.func, &program_size);
 106
 107    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
 108       int i;
 109
 110       printf("gs:\n");
 111       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 112          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 113                     intel->gen);
 114       printf("\n");
 115     }
 116
 117    brw_upload_cache(&brw->cache, BRW_GS_PROG,
 118                     &c.key, sizeof(c.key),
 119                     program, program_size,
 120                     &c.prog_data, sizeof(c.prog_data),
 121                     &brw->gs.prog_offset, &brw->gs.prog_data);
 122    ralloc_free(mem_ctx);
 123 }
 124
 125 static void populate_key( struct brw_context *brw,
 126                           struct brw_gs_prog_key *key )
 127 {
 128    struct gl_context *ctx = &brw->intel.ctx;
 129    struct intel_context *intel = &brw->intel;
 130
 131    memset(key, 0, sizeof(*key));
 132
 133    /* CACHE_NEW_VS_PROG */
 134    key->attrs = brw->vs.prog_data->outputs_written;
 135
 136    /* BRW_NEW_PRIMITIVE */
 137    key->primitive = brw->primitive;
 138
 139    /* _NEW_LIGHT */
 140    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 141    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
 142       /* Provide consistent primitive order with brw_set_prim's
 143        * optimization of single quads to trifans.
 144        */
 145       key->pv_first = true;
 146    }
 147
 148    /* _NEW_TRANSFORM */
 149    key->userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 150
 151    key->need_gs_prog = (intel->gen >= 6)
 152       ? 0
 153       : (brw->primitive == _3DPRIM_QUADLIST ||
 154          brw->primitive == _3DPRIM_QUADSTRIP ||
 155          brw->primitive == _3DPRIM_LINELOOP);
 156 }
 157
 158 /* Calculate interpolants for triangle and line rasterization.
 159  */
 160 static void
 161 brw_upload_gs_prog(struct brw_context *brw)
 162 {
 163    struct brw_gs_prog_key key;
 164    /* Populate the key:
 165     */
 166    populate_key(brw, &key);
 167
 168    if (brw->gs.prog_active != key.need_gs_prog) {
 169       brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
 170       brw->gs.prog_active = key.need_gs_prog;
 171    }
 172
 173    if (brw->gs.prog_active) {
 174       if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
 175                             &key, sizeof(key),
 176                             &brw->gs.prog_offset, &brw->gs.prog_data)) {
 177          compile_gs_prog( brw, &key );
 178       }
 179    }
 180 }
 181
 182
 183 const struct brw_tracked_state brw_gs_prog = {
 184    .dirty = {
 185       .mesa  = (_NEW_LIGHT |
 186                 _NEW_TRANSFORM),
 187       .brw   = BRW_NEW_PRIMITIVE,
 188       .cache = CACHE_NEW_VS_PROG
 189    },
 190    .emit = brw_upload_gs_prog
 191 };