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 "glheader.h"
  34 #include "macros.h"
  35 #include "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
 105
 106 void brw_gs_quads( struct brw_gs_compile *c )
 107 {
 108    brw_gs_alloc_regs(c, 4);
 109
 110    /* Use polygons for correct edgeflag behaviour. Note that vertex 3
 111     * is the PV for quads, but vertex 0 for polygons:
 112     */
 113    brw_gs_emit_vue(c, c->reg.vertex[3], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 114    brw_gs_emit_vue(c, c->reg.vertex[0], 0, (_3DPRIM_POLYGON << 2));
 115    brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_POLYGON << 2));
 116    brw_gs_emit_vue(c, c->reg.vertex[2], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 117 }
 118
 119 void brw_gs_quad_strip( struct brw_gs_compile *c )
 120 {
 121    brw_gs_alloc_regs(c, 4);
 122
 123    brw_gs_emit_vue(c, c->reg.vertex[2], 0, ((_3DPRIM_POLYGON << 2) | R02_PRIM_START));
 124    brw_gs_emit_vue(c, c->reg.vertex[3], 0, (_3DPRIM_POLYGON << 2));
 125    brw_gs_emit_vue(c, c->reg.vertex[0], 0, (_3DPRIM_POLYGON << 2));
 126    brw_gs_emit_vue(c, c->reg.vertex[1], 1, ((_3DPRIM_POLYGON << 2) | R02_PRIM_END));
 127 }
 128
 129 void brw_gs_tris( struct brw_gs_compile *c )
 130 {
 131    brw_gs_alloc_regs(c, 3);
 132    brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_TRILIST << 2) | R02_PRIM_START));
 133    brw_gs_emit_vue(c, c->reg.vertex[1], 0, (_3DPRIM_TRILIST << 2));
 134    brw_gs_emit_vue(c, c->reg.vertex[2], 1, ((_3DPRIM_TRILIST << 2) | R02_PRIM_END));
 135 }
 136
 137 void brw_gs_lines( struct brw_gs_compile *c )
 138 {
 139    brw_gs_alloc_regs(c, 2);
 140    brw_gs_emit_vue(c, c->reg.vertex[0], 0, ((_3DPRIM_LINESTRIP << 2) | R02_PRIM_START));
 141    brw_gs_emit_vue(c, c->reg.vertex[1], 1, ((_3DPRIM_LINESTRIP << 2) | R02_PRIM_END));
 142 }
 143
 144 void brw_gs_points( struct brw_gs_compile *c )
 145 {
 146    brw_gs_alloc_regs(c, 1);
 147    brw_gs_emit_vue(c, c->reg.vertex[0], 1, ((_3DPRIM_POINTLIST << 2) | R02_PRIM_START | R02_PRIM_END));
 148 }
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