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:4;
  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
  59    GLfloat offset_factor;
  60    GLfloat offset_units;
  61 };
  62
  63
  64 #define CLIP_LINE   0
  65 #define CLIP_POINT  1
  66 #define CLIP_FILL   2
  67 #define CLIP_CULL   3
  68
  69
  70 #define PRIM_MASK  (0x1f)
  71
  72 struct brw_clip_compile {
  73    struct brw_compile func;
  74    struct brw_clip_prog_key key;
  75    struct brw_clip_prog_data prog_data;
  76
  77    struct {
  78       struct brw_reg R0;
  79       struct brw_reg vertex[MAX_VERTS];
  80
  81       struct brw_reg t;
  82       struct brw_reg t0, t1;
  83       struct brw_reg dp0, dp1;
  84
  85       struct brw_reg dpPrev;
  86       struct brw_reg dp;
  87       struct brw_reg loopcount;
  88       struct brw_reg nr_verts;
  89       struct brw_reg planemask;
  90
  91       struct brw_reg inlist;
  92       struct brw_reg outlist;
  93       struct brw_reg freelist;
  94
  95       struct brw_reg dir;
  96       struct brw_reg tmp0, tmp1;
  97       struct brw_reg offset;
  98
  99       struct brw_reg fixed_planes;
 100       struct brw_reg plane_equation;
 101
 102       struct brw_reg ff_sync;
 103    } reg;
 104
 105    /* Number of registers storing VUE data */
 106    GLuint nr_regs;
 107
 108    GLuint first_tmp;
 109    GLuint last_tmp;
 110
 111    bool need_direction;
 112
 113    struct brw_vue_map vue_map;
 114 };
 115
 116 #define ATTR_SIZE  (4*4)
 117
 118 /**
 119  * True if the given varying is one of the outputs of the vertex shader.
 120  */
 121 static inline bool brw_clip_have_varying(struct brw_clip_compile *c,
 122                                          GLuint varying)
 123 {
 124    return (c->key.attrs & BITFIELD64_BIT(varying)) ? 1 : 0;
 125 }
 126
 127 /* Points are only culled, so no need for a clip routine, however it
 128  * works out easier to have a dummy one.
 129  */
 130 void brw_emit_unfilled_clip( struct brw_clip_compile *c );
 131 void brw_emit_tri_clip( struct brw_clip_compile *c );
 132 void brw_emit_line_clip( struct brw_clip_compile *c );
 133 void brw_emit_point_clip( struct brw_clip_compile *c );
 134
 135 /* brw_clip_tri.c, for use by the unfilled clip routine:
 136  */
 137 void brw_clip_tri_init_vertices( struct brw_clip_compile *c );
 138 void brw_clip_tri_flat_shade( struct brw_clip_compile *c );
 139 void brw_clip_tri( struct brw_clip_compile *c );
 140 void brw_clip_tri_emit_polygon( struct brw_clip_compile *c );
 141 void brw_clip_tri_alloc_regs( struct brw_clip_compile *c,
 142                               GLuint nr_verts );
 143
 144
 145 /* Utils:
 146  */
 147
 148 void brw_clip_interp_vertex( struct brw_clip_compile *c,
 149                              struct brw_indirect dest_ptr,
 150                              struct brw_indirect v0_ptr, /* from */
 151                              struct brw_indirect v1_ptr, /* to */
 152                              struct brw_reg t0,
 153                              bool force_edgeflag );
 154
 155 void brw_clip_init_planes( struct brw_clip_compile *c );
 156
 157 void brw_clip_emit_vue(struct brw_clip_compile *c,
 158                        struct brw_indirect vert,
 159                        bool allocate,
 160                        bool eot,
 161                        GLuint header);
 162
 163 void brw_clip_kill_thread(struct brw_clip_compile *c);
 164
 165 struct brw_reg brw_clip_plane_stride( struct brw_clip_compile *c );
 166 struct brw_reg brw_clip_plane0_address( struct brw_clip_compile *c );
 167
 168 void brw_clip_copy_colors( struct brw_clip_compile *c,
 169                            GLuint to, GLuint from );
 170
 171 void brw_clip_init_clipmask( struct brw_clip_compile *c );
 172
 173 struct brw_reg get_tmp( struct brw_clip_compile *c );
 174
 175 void brw_clip_project_position(struct brw_clip_compile *c,
 176              struct brw_reg pos );
 177 void brw_clip_ff_sync(struct brw_clip_compile *c);
 178 void brw_clip_init_ff_sync(struct brw_clip_compile *c);
 179 #endif