src/mesa/drivers/dri/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
  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    GLbitfield64 attrs;
  46    GLuint primitive:4;
  47    GLuint nr_userclip:3;
  48    GLuint do_flat_shading:1;
  49    GLuint pv_first:1;
  50    GLuint do_unfilled:1;
  51    GLuint fill_cw:2;            /* includes cull information */
  52    GLuint fill_ccw:2;           /* includes cull information */
  53    GLuint offset_cw:1;
  54    GLuint offset_ccw:1;
  55    GLuint copy_bfc_cw:1;
  56    GLuint copy_bfc_ccw:1;
  57    GLuint clip_mode:3;
  58    GLuint pad0:11;
  59
  60    GLfloat offset_factor;
  61    GLfloat offset_units;
  62 };
  63
  64
  65 #define CLIP_LINE   0
  66 #define CLIP_POINT  1
  67 #define CLIP_FILL   2
  68 #define CLIP_CULL   3
  69
  70
  71 #define PRIM_MASK  (0x1f)
  72
  73 struct brw_clip_compile {
  74    struct brw_compile func;
  75    struct brw_clip_prog_key key;
  76    struct brw_clip_prog_data prog_data;
  77
  78    struct {
  79       struct brw_reg R0;
  80       struct brw_reg vertex[MAX_VERTS];
  81
  82       struct brw_reg t;
  83       struct brw_reg t0, t1;
  84       struct brw_reg dp0, dp1;
  85
  86       struct brw_reg dpPrev;
  87       struct brw_reg dp;
  88       struct brw_reg loopcount;
  89       struct brw_reg nr_verts;
  90       struct brw_reg planemask;
  91
  92       struct brw_reg inlist;
  93       struct brw_reg outlist;
  94       struct brw_reg freelist;
  95
  96       struct brw_reg dir;
  97       struct brw_reg tmp0, tmp1;
  98       struct brw_reg offset;
  99
 100       struct brw_reg fixed_planes;
 101       struct brw_reg plane_equation;
 102
 103       struct brw_reg ff_sync;
 104    } reg;
 105
 106    /* 3 different ways of expressing vertex size:
 107     */
 108    GLuint nr_attrs;
 109    GLuint nr_regs;
 110    GLuint nr_bytes;
 111
 112    GLuint first_tmp;
 113    GLuint last_tmp;
 114
 115    GLboolean need_direction;
 116
 117    GLuint last_mrf;
 118
 119    GLuint header_position_offset;
 120    GLuint offset[VERT_ATTRIB_MAX];
 121 };
 122
 123 #define ATTR_SIZE  (4*4)
 124
 125 /* Points are only culled, so no need for a clip routine, however it
 126  * works out easier to have a dummy one.
 127  */
 128 void brw_emit_unfilled_clip( struct brw_clip_compile *c );
 129 void brw_emit_tri_clip( struct brw_clip_compile *c );
 130 void brw_emit_line_clip( struct brw_clip_compile *c );
 131 void brw_emit_point_clip( struct brw_clip_compile *c );
 132
 133 /* brw_clip_tri.c, for use by the unfilled clip routine:
 134  */
 135 void brw_clip_tri_init_vertices( struct brw_clip_compile *c );
 136 void brw_clip_tri_flat_shade( struct brw_clip_compile *c );
 137 void brw_clip_tri( struct brw_clip_compile *c );
 138 void brw_clip_tri_emit_polygon( struct brw_clip_compile *c );
 139 void brw_clip_tri_alloc_regs( struct brw_clip_compile *c,
 140                               GLuint nr_verts );
 141
 142
 143 /* Utils:
 144  */
 145
 146 void brw_clip_interp_vertex( struct brw_clip_compile *c,
 147                              struct brw_indirect dest_ptr,
 148                              struct brw_indirect v0_ptr, /* from */
 149                              struct brw_indirect v1_ptr, /* to */
 150                              struct brw_reg t0,
 151                              GLboolean force_edgeflag );
 152
 153 void brw_clip_init_planes( struct brw_clip_compile *c );
 154
 155 void brw_clip_emit_vue(struct brw_clip_compile *c,
 156                        struct brw_indirect vert,
 157                        GLboolean allocate,
 158                        GLboolean eot,
 159                        GLuint header);
 160
 161 void brw_clip_kill_thread(struct brw_clip_compile *c);
 162
 163 struct brw_reg brw_clip_plane_stride( struct brw_clip_compile *c );
 164 struct brw_reg brw_clip_plane0_address( struct brw_clip_compile *c );
 165
 166 void brw_clip_copy_colors( struct brw_clip_compile *c,
 167                            GLuint to, GLuint from );
 168
 169 void brw_clip_init_clipmask( struct brw_clip_compile *c );
 170
 171 struct brw_reg get_tmp( struct brw_clip_compile *c );
 172
 173 void brw_clip_project_position(struct brw_clip_compile *c,
 174              struct brw_reg pos );
 175 void brw_clip_ff_sync(struct brw_clip_compile *c);
 176 void brw_clip_init_ff_sync(struct brw_clip_compile *c);
 177 #endif