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