src/mesa/drivers/dri/i965/brw_gs_emit.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
  33 #include "main/glheader.h"
  34 #include "main/macros.h"
  35 #include "main/enums.h"
  36
  37 #include "shader/program.h"
  38 #include "intel_batchbuffer.h"
  39
  40 #include "brw_defines.h"
  41 #include "brw_context.h"
  42 #include "brw_eu.h"
  43 #include "brw_gs.h"
  44
  45 static void brw_gs_alloc_regs( struct brw_gs_compile *c,
  46                                GLuint nr_verts )
  47 {
  48    GLuint i = 0,j;
  49
  50    /* Register usage is static, precompute here:
  51     */
  52    c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++;
  53
  54    /* Payload vertices plus space for more generated vertices:
  55     */
  56    for (j = 0; j < nr_verts; j++) {
  57       c->reg.vertex[j] = brw_vec4_grf(i, 0);
  58       i += c->nr_regs;
  59    }
  60
  61    c->prog_data.urb_read_length = c->nr_regs;
  62    c->prog_data.total_grf = i;
  63 }
  64
  65
  66 static void brw_gs_emit_vue(struct brw_gs_compile *c,
  67                             struct brw_reg vert,
  68                             GLboolean last,
  69                             GLuint header)
  70 {
  71    struct brw_compile *p = &c->func;
  72    GLboolean allocate = !last;
  73
  74    /* Overwrite PrimType and PrimStart in the message header, for
  75     * each vertex in turn:
  76     */
  77    brw_MOV(p, get_element_ud(c->reg.R0, 2), brw_imm_ud(header));
  78
  79    /* Copy the vertex from vertn into m1..mN+1:
  80     */
  81    brw_copy8(p, brw_message_reg(1), vert, c->nr_regs);
  82
  83    /* Send each vertex as a seperate write to the urb.  This is
  84     * different to the concept in brw_sf_emit.c, where subsequent
  85     * writes are used to build up a single urb entry.  Each of these
  86     * writes instantiates a seperate urb entry, and a new one must be
  87     * allocated each time.
  88     */
  89    brw_urb_WRITE(p,
  90                  allocate ? c->reg.R0 : retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
  91                  0,
  92                  c->reg.R0,
  93                  allocate,
  94                  1,             /* used */
  95                  c->nr_regs + 1, /* msg length */
  96                  allocate ? 1 : 0, /* response length */
  97                  allocate ? 0 : 1, /* eot */
  98                  1,             /* writes_complete */
  99                  0,             /* urb offset */
 100                  BRW_URB_SWIZZLE_NONE);
 101 }
 102
 103 static void brw_gs_ff_sync(struct brw_gs_compile *c, int num_prim)
 104 {
 105         struct brw_compile *p = &c->func;
 106         brw_MOV(p, get_element_ud(c->reg.R0, 1), brw_imm_ud(num_prim));
 107         brw_ff_sync(p,
 108                                 c->reg.R0,
 109                                 0,
 110                                 c->reg.R0,
 111                                 1,
 112                                 1,              /* used */
 113                                 1,      /* msg length */
 114                                 1,              /* response length */
 115                                 0,              /* eot */
 116                                 1,              /* write compelete */
 117                                 0,              /* urb offset */
 118                                 BRW_URB_SWIZZLE_NONE);
 119 }
 120
 121
 122 void brw_gs_quads( struct brw_gs_compile *c, struct brw_gs_prog_key *key )
 123 {
 124    brw_gs_alloc_regs(c, 4);
 125
 126    /* Use polygons for correct edgeflag behaviour. Note that vertex 3
 127     * is the PV for quads, but vertex 0 for polygons:
 128     */
 129    if (c->need_ff_sync)
 130            brw_gs_ff_sync(c, 1);
 131    if (key->pv_first) {
 132       brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 133       brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_POLYGON << 2));
 134       brw_gs_emit_vue(c, c->reg.vertex[2], 0, (_3DPRIM_POLYGON << 2));
 135       brw_gs_emit_vue(c, c->reg.vertex[3], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 136    }
 137    else {
 138       brw_gs_emit_vue(c, c->reg.vertex[3], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 139       brw_gs_emit_vue(c, c->reg.vertex[0], 0, (_3DPRIM_POLYGON << 2));
 140       brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_POLYGON << 2));
 141       brw_gs_emit_vue(c, c->reg.vertex[2], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 142    }
 143 }
 144
 145 void brw_gs_quad_strip( struct brw_gs_compile *c, struct brw_gs_prog_key *key )
 146 {
 147    brw_gs_alloc_regs(c, 4);
 148
 149    if (c->need_ff_sync)
 150            brw_gs_ff_sync(c, 1);
 151    if (key->pv_first) {
 152       brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 153       brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_POLYGON << 2));
 154       brw_gs_emit_vue(c, c->reg.vertex[2], 0, (_3DPRIM_POLYGON << 2));
 155       brw_gs_emit_vue(c, c->reg.vertex[3], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 156    }
 157    else {
 158       brw_gs_emit_vue(c, c->reg.vertex[2], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 159       brw_gs_emit_vue(c, c->reg.vertex[3], 0, (_3DPRIM_POLYGON << 2));
 160       brw_gs_emit_vue(c, c->reg.vertex[0], 0, (_3DPRIM_POLYGON << 2));
 161       brw_gs_emit_vue(c, c->reg.vertex[1], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 162    }
 163 }
 164
 165 void brw_gs_tris( struct brw_gs_compile *c )
 166 {
 167    brw_gs_alloc_regs(c, 3);
 168
 169    if (c->need_ff_sync)
 170            brw_gs_ff_sync(c, 1);
 171    brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_TRILIST << 2) | R02_PRIM_START));
 172    brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_TRILIST << 2));
 173    brw_gs_emit_vue(c, c->reg.vertex[2], 1, ((_3DPRIM_TRILIST << 2) | R02_PRIM_END));
 174 }
 175
 176 void brw_gs_lines( struct brw_gs_compile *c )
 177 {
 178    brw_gs_alloc_regs(c, 2);
 179
 180    if (c->need_ff_sync)
 181            brw_gs_ff_sync(c, 1);
 182    brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_LINESTRIP << 2) | R02_PRIM_START));
 183    brw_gs_emit_vue(c, c->reg.vertex[1], 1, ((_3DPRIM_LINESTRIP << 2) | R02_PRIM_END));
 184 }
 185
 186 void brw_gs_points( struct brw_gs_compile *c )
 187 {
 188    brw_gs_alloc_regs(c, 1);
 189
 190    if (c->need_ff_sync)
 191            brw_gs_ff_sync(c, 1);
 192    brw_gs_emit_vue(c, c->reg.vertex[0], 1, ((_3DPRIM_POINTLIST << 2) | R02_PRIM_START | R02_PRIM_END));
 193 }
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