src/gallium/drivers/i965simple/brw_clip.h

   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 #ifndef BRW_CLIP_H
  33 #define BRW_CLIP_H
  34
  35
  36 #include "brw_context.h"
  37 #include "brw_eu.h"
  38
  39 #define MAX_VERTS (3+6+6)
  40
  41 /* Note that if unfilled primitives are being emitted, we have to fix
  42  * up polygon offset and flatshading at this point:
  43  */
  44 struct brw_clip_prog_key {
  45    unsigned attrs:32;
  46    unsigned primitive:4;
  47    unsigned nr_userclip:3;
  48    unsigned do_flat_shading:1;
  49    unsigned do_unfilled:1;
  50    unsigned fill_cw:2;          /* includes cull information */
  51    unsigned fill_ccw:2;         /* includes cull information */
  52    unsigned offset_cw:1;
  53    unsigned offset_ccw:1;
  54    unsigned pad0:17;
  55
  56    unsigned copy_bfc_cw:1;
  57    unsigned copy_bfc_ccw:1;
  58    unsigned clip_mode:3;
  59    unsigned pad1:27;
  60
  61    float offset_factor;
  62    float offset_units;
  63 };
  64
  65
  66 #define CLIP_LINE   0
  67 #define CLIP_POINT  1
  68 #define CLIP_FILL   2
  69 #define CLIP_CULL   3
  70
  71
  72 #define PRIM_MASK  (0x1f)
  73
  74 struct brw_clip_compile {
  75    struct brw_compile func;
  76    struct brw_clip_prog_key key;
  77    struct brw_clip_prog_data prog_data;
  78
  79    struct {
  80       struct brw_reg R0;
  81       struct brw_reg vertex[MAX_VERTS];
  82
  83       struct brw_reg t;
  84       struct brw_reg t0, t1;
  85       struct brw_reg dp0, dp1;
  86
  87       struct brw_reg dpPrev;
  88       struct brw_reg dp;
  89       struct brw_reg loopcount;
  90       struct brw_reg nr_verts;
  91       struct brw_reg planemask;
  92
  93       struct brw_reg inlist;
  94       struct brw_reg outlist;
  95       struct brw_reg freelist;
  96
  97       struct brw_reg dir;
  98       struct brw_reg tmp0, tmp1;
  99       struct brw_reg offset;
 100
 101       struct brw_reg fixed_planes;
 102       struct brw_reg plane_equation;
 103    } reg;
 104
 105    /* 3 different ways of expressing vertex size:
 106     */
 107    unsigned nr_attrs;
 108    unsigned nr_regs;
 109    unsigned nr_bytes;
 110
 111    unsigned first_tmp;
 112    unsigned last_tmp;
 113
 114    boolean need_direction;
 115
 116    unsigned last_mrf;
 117
 118    unsigned header_position_offset;
 119    unsigned offset[PIPE_MAX_ATTRIBS];
 120 };
 121
 122 #define ATTR_SIZE  (4*4)
 123
 124 /* Points are only culled, so no need for a clip routine, however it
 125  * works out easier to have a dummy one.
 126  */
 127 void brw_emit_unfilled_clip( struct brw_clip_compile *c );
 128 void brw_emit_tri_clip( struct brw_clip_compile *c );
 129 void brw_emit_line_clip( struct brw_clip_compile *c );
 130 void brw_emit_point_clip( struct brw_clip_compile *c );
 131
 132 /* brw_clip_tri.c, for use by the unfilled clip routine:
 133  */
 134 void brw_clip_tri_init_vertices( struct brw_clip_compile *c );
 135 void brw_clip_tri_flat_shade( struct brw_clip_compile *c );
 136 void brw_clip_tri( struct brw_clip_compile *c );
 137 void brw_clip_tri_emit_polygon( struct brw_clip_compile *c );
 138 void brw_clip_tri_alloc_regs( struct brw_clip_compile *c,
 139                               unsigned nr_verts );
 140
 141
 142 /* Utils:
 143  */
 144
 145 void brw_clip_interp_vertex( struct brw_clip_compile *c,
 146                              struct brw_indirect dest_ptr,
 147                              struct brw_indirect v0_ptr, /* from */
 148                              struct brw_indirect v1_ptr, /* to */
 149                              struct brw_reg t0,
 150                              boolean force_edgeflag );
 151
 152 void brw_clip_init_planes( struct brw_clip_compile *c );
 153
 154 void brw_clip_emit_vue(struct brw_clip_compile *c,
 155                        struct brw_indirect vert,
 156                        boolean allocate,
 157                        boolean eot,
 158                        unsigned header);
 159
 160 void brw_clip_kill_thread(struct brw_clip_compile *c);
 161
 162 struct brw_reg brw_clip_plane_stride( struct brw_clip_compile *c );
 163 struct brw_reg brw_clip_plane0_address( struct brw_clip_compile *c );
 164
 165 void brw_clip_copy_colors( struct brw_clip_compile *c,
 166                            unsigned to, unsigned from );
 167
 168 void brw_clip_init_clipmask( struct brw_clip_compile *c );
 169
 170 #endif