src/gallium/drivers/i965/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 #include "pipe/p_state.h"
  36 #include "brw_reg.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    GLuint nr_attrs:6;
  46    GLuint primitive:4;
  47    GLuint nr_userclip:3;
  48    GLuint do_flat_shading:1;
  49    GLuint do_unfilled:1;
  50    GLuint fill_cw:2;            /* includes cull information */
  51    GLuint fill_ccw:2;           /* includes cull information */
  52    GLuint offset_cw:1;
  53    GLuint offset_ccw:1;
  54    GLuint copy_bfc_cw:1;
  55    GLuint copy_bfc_ccw:1;
  56    GLuint clip_mode:3;
  57    GLuint output_hpos:6;        /* not always zero? */
  58
  59    GLuint output_color0:6;
  60    GLuint output_color1:6;
  61    GLuint output_bfc0:6;
  62    GLuint output_bfc1:6;
  63    GLuint output_edgeflag:6;
  64    GLuint pad1:2;
  65
  66    GLfloat offset_factor;
  67    GLfloat offset_units;
  68 };
  69
  70 struct brw_clip_prog_data {
  71    GLuint curb_read_length;     /* user planes? */
  72    GLuint clip_mode;
  73    GLuint urb_read_length;
  74    GLuint total_grf;
  75 };
  76
  77 #define CLIP_LINE   0
  78 #define CLIP_POINT  1
  79 #define CLIP_FILL   2
  80 #define CLIP_CULL   3
  81
  82
  83 #define PRIM_MASK  (0x1f)
  84
  85 struct brw_clip_compile {
  86    struct brw_compile func;
  87    struct brw_clip_prog_key key;
  88    struct brw_clip_prog_data prog_data;
  89
  90    struct {
  91       struct brw_reg R0;
  92       struct brw_reg vertex[MAX_VERTS];
  93
  94       struct brw_reg t;
  95       struct brw_reg t0, t1;
  96       struct brw_reg dp0, dp1;
  97
  98       struct brw_reg dpPrev;
  99       struct brw_reg dp;
 100       struct brw_reg loopcount;
 101       struct brw_reg nr_verts;
 102       struct brw_reg planemask;
 103
 104       struct brw_reg inlist;
 105       struct brw_reg outlist;
 106       struct brw_reg freelist;
 107
 108       struct brw_reg dir;
 109       struct brw_reg tmp0, tmp1;
 110       struct brw_reg offset;
 111
 112       struct brw_reg fixed_planes;
 113       struct brw_reg plane_equation;
 114
 115       struct brw_reg ff_sync;
 116    } reg;
 117
 118    /* 3 different ways of expressing vertex size, including
 119     * key.nr_attrs.
 120     */
 121    GLuint nr_regs;
 122    GLuint nr_bytes;
 123
 124    GLuint first_tmp;
 125    GLuint last_tmp;
 126
 127    GLboolean need_direction;
 128    struct brw_chipset chipset;
 129
 130    GLuint last_mrf;
 131
 132    GLuint header_position_offset;
 133    GLboolean need_ff_sync;
 134
 135    GLuint nr_color_attrs;
 136    GLuint offset_color0;
 137    GLuint offset_color1;
 138    GLuint offset_bfc0;
 139    GLuint offset_bfc1;
 140
 141    GLuint offset_hpos;
 142    GLuint offset_edgeflag;
 143 };
 144
 145 #define ATTR_SIZE  (4*4)
 146
 147 /* Points are only culled, so no need for a clip routine, however it
 148  * works out easier to have a dummy one.
 149  */
 150 void brw_emit_unfilled_clip( struct brw_clip_compile *c );
 151 void brw_emit_tri_clip( struct brw_clip_compile *c );
 152 void brw_emit_line_clip( struct brw_clip_compile *c );
 153 void brw_emit_point_clip( struct brw_clip_compile *c );
 154
 155 /* brw_clip_tri.c, for use by the unfilled clip routine:
 156  */
 157 void brw_clip_tri_init_vertices( struct brw_clip_compile *c );
 158 void brw_clip_tri_flat_shade( struct brw_clip_compile *c );
 159 void brw_clip_tri( struct brw_clip_compile *c );
 160 void brw_clip_tri_emit_polygon( struct brw_clip_compile *c );
 161 void brw_clip_tri_alloc_regs( struct brw_clip_compile *c,
 162                               GLuint nr_verts );
 163
 164
 165 /* Utils:
 166  */
 167
 168 void brw_clip_interp_vertex( struct brw_clip_compile *c,
 169                              struct brw_indirect dest_ptr,
 170                              struct brw_indirect v0_ptr, /* from */
 171                              struct brw_indirect v1_ptr, /* to */
 172                              struct brw_reg t0,
 173                              GLboolean force_edgeflag );
 174
 175 void brw_clip_init_planes( struct brw_clip_compile *c );
 176
 177 void brw_clip_emit_vue(struct brw_clip_compile *c,
 178                        struct brw_indirect vert,
 179                        GLboolean allocate,
 180                        GLboolean eot,
 181                        GLuint header);
 182
 183 void brw_clip_kill_thread(struct brw_clip_compile *c);
 184
 185 struct brw_reg brw_clip_plane_stride( struct brw_clip_compile *c );
 186 struct brw_reg brw_clip_plane0_address( struct brw_clip_compile *c );
 187
 188 void brw_clip_copy_colors( struct brw_clip_compile *c,
 189                            GLuint to, GLuint from );
 190
 191 void brw_clip_init_clipmask( struct brw_clip_compile *c );
 192
 193 struct brw_reg get_tmp( struct brw_clip_compile *c );
 194
 195 void brw_clip_project_position(struct brw_clip_compile *c,
 196              struct brw_reg pos );
 197 void brw_clip_ff_sync(struct brw_clip_compile *c);
 198 void brw_clip_init_ff_sync(struct brw_clip_compile *c);
 199 #endif