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