src/mesa/drivers/dri/i965/brw_clip.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 #include "main/glheader.h"
  33 #include "main/macros.h"
  34 #include "main/enums.h"
  35
  36 #include "intel_batchbuffer.h"
  37
  38 #include "brw_defines.h"
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "brw_util.h"
  42 #include "brw_state.h"
  43 #include "brw_clip.h"
  44
  45
  46 #define FRONT_UNFILLED_BIT  0x1
  47 #define BACK_UNFILLED_BIT   0x2
  48
  49
  50 static void compile_clip_prog( struct brw_context *brw,
  51                              struct brw_clip_prog_key *key )
  52 {
  53    struct brw_clip_compile c;
  54    const GLuint *program;
  55    GLuint program_size;
  56    GLuint delta;
  57    GLuint i;
  58
  59    memset(&c, 0, sizeof(c));
  60
  61    /* Begin the compilation:
  62     */
  63    brw_init_compile(brw, &c.func);
  64
  65    c.func.single_program_flow = 1;
  66
  67    c.key = *key;
  68
  69
  70    /* Need to locate the two positions present in vertex + header.
  71     * These are currently hardcoded:
  72     */
  73    c.header_position_offset = ATTR_SIZE;
  74
  75    for (i = 0, delta = REG_SIZE; i < VERT_RESULT_MAX; i++)
  76       if (c.key.attrs & (1<<i)) {
  77          c.offset[i] = delta;
  78          delta += ATTR_SIZE;
  79       }
  80
  81    c.nr_attrs = brw_count_bits(c.key.attrs);
  82    c.nr_regs = (c.nr_attrs + 1) / 2 + 1;  /* are vertices packed, or reg-aligned? */
  83    c.nr_bytes = c.nr_regs * REG_SIZE;
  84
  85    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  86
  87    /* For some reason the thread is spawned with only 4 channels
  88     * unmasked.
  89     */
  90    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  91
  92
  93    /* Would ideally have the option of producing a program which could
  94     * do all three:
  95     */
  96    switch (key->primitive) {
  97    case GL_TRIANGLES:
  98       if (key->do_unfilled)
  99          brw_emit_unfilled_clip( &c );
 100       else
 101          brw_emit_tri_clip( &c );
 102       break;
 103    case GL_LINES:
 104       brw_emit_line_clip( &c );
 105       break;
 106    case GL_POINTS:
 107       brw_emit_point_clip( &c );
 108       break;
 109    default:
 110       assert(0);
 111       return;
 112    }
 113
 114
 115
 116    /* get the program
 117     */
 118    program = brw_get_program(&c.func, &program_size);
 119
 120    /* Upload
 121     */
 122    dri_bo_unreference(brw->clip.prog_bo);
 123    brw->clip.prog_bo = brw_upload_cache( &brw->cache,
 124                                          BRW_CLIP_PROG,
 125                                          &c.key, sizeof(c.key),
 126                                          NULL, 0,
 127                                          program, program_size,
 128                                          &c.prog_data,
 129                                          &brw->clip.prog_data );
 130 }
 131
 132 /* Calculate interpolants for triangle and line rasterization.
 133  */
 134 static void upload_clip_prog(struct brw_context *brw)
 135 {
 136    GLcontext *ctx = &brw->intel.ctx;
 137    struct brw_clip_prog_key key;
 138
 139    memset(&key, 0, sizeof(key));
 140
 141    /* Populate the key:
 142     */
 143    /* BRW_NEW_REDUCED_PRIMITIVE */
 144    key.primitive = brw->intel.reduced_primitive;
 145    /* CACHE_NEW_VS_PROG */
 146    key.attrs = brw->vs.prog_data->outputs_written;
 147    /* _NEW_LIGHT */
 148    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 149    /* _NEW_TRANSFORM */
 150    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 151    key.clip_mode = BRW_CLIPMODE_NORMAL;
 152
 153    /* _NEW_POLYGON */
 154    if (key.primitive == GL_TRIANGLES) {
 155       if (ctx->Polygon.CullFlag &&
 156           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 157          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 158       else {
 159          GLuint fill_front = CLIP_CULL;
 160          GLuint fill_back = CLIP_CULL;
 161          GLuint offset_front = 0;
 162          GLuint offset_back = 0;
 163
 164          if (!ctx->Polygon.CullFlag ||
 165              ctx->Polygon.CullFaceMode != GL_FRONT) {
 166             switch (ctx->Polygon.FrontMode) {
 167             case GL_FILL:
 168                fill_front = CLIP_FILL;
 169                offset_front = 0;
 170                break;
 171             case GL_LINE:
 172                fill_front = CLIP_LINE;
 173                offset_front = ctx->Polygon.OffsetLine;
 174                break;
 175             case GL_POINT:
 176                fill_front = CLIP_POINT;
 177                offset_front = ctx->Polygon.OffsetPoint;
 178                break;
 179             }
 180          }
 181
 182          if (!ctx->Polygon.CullFlag ||
 183              ctx->Polygon.CullFaceMode != GL_BACK) {
 184             switch (ctx->Polygon.BackMode) {
 185             case GL_FILL:
 186                fill_back = CLIP_FILL;
 187                offset_back = 0;
 188                break;
 189             case GL_LINE:
 190                fill_back = CLIP_LINE;
 191                offset_back = ctx->Polygon.OffsetLine;
 192                break;
 193             case GL_POINT:
 194                fill_back = CLIP_POINT;
 195                offset_back = ctx->Polygon.OffsetPoint;
 196                break;
 197             }
 198          }
 199
 200          if (ctx->Polygon.BackMode != GL_FILL ||
 201              ctx->Polygon.FrontMode != GL_FILL) {
 202             key.do_unfilled = 1;
 203
 204             /* Most cases the fixed function units will handle.  Cases where
 205              * one or more polygon faces are unfilled will require help:
 206              */
 207             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 208
 209             if (offset_back || offset_front) {
 210                /* _NEW_POLYGON, _NEW_BUFFERS */
 211                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 212                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 213             }
 214
 215             switch (ctx->Polygon.FrontFace) {
 216             case GL_CCW:
 217                key.fill_ccw = fill_front;
 218                key.fill_cw = fill_back;
 219                key.offset_ccw = offset_front;
 220                key.offset_cw = offset_back;
 221                if (ctx->Light.Model.TwoSide &&
 222                    key.fill_cw != CLIP_CULL)
 223                   key.copy_bfc_cw = 1;
 224                break;
 225             case GL_CW:
 226                key.fill_cw = fill_front;
 227                key.fill_ccw = fill_back;
 228                key.offset_cw = offset_front;
 229                key.offset_ccw = offset_back;
 230                if (ctx->Light.Model.TwoSide &&
 231                    key.fill_ccw != CLIP_CULL)
 232                   key.copy_bfc_ccw = 1;
 233                break;
 234             }
 235          }
 236       }
 237    }
 238
 239    dri_bo_unreference(brw->clip.prog_bo);
 240    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 241                                         &key, sizeof(key),
 242                                         NULL, 0,
 243                                         &brw->clip.prog_data);
 244    if (brw->clip.prog_bo == NULL)
 245       compile_clip_prog( brw, &key );
 246 }
 247
 248
 249 const struct brw_tracked_state brw_clip_prog = {
 250    .dirty = {
 251       .mesa  = (_NEW_LIGHT |
 252                 _NEW_TRANSFORM |
 253                 _NEW_POLYGON |
 254                 _NEW_BUFFERS),
 255       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 256       .cache = CACHE_NEW_VS_PROG
 257    },
 258    .prepare = upload_clip_prog
 259 };