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.CullFaceMode == GL_FRONT_AND_BACK)
 156          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 157       else {
 158          GLuint fill_front = CLIP_CULL;
 159          GLuint fill_back = CLIP_CULL;
 160          GLuint offset_front = 0;
 161          GLuint offset_back = 0;
 162
 163          if (!ctx->Polygon.CullFlag ||
 164              ctx->Polygon.CullFaceMode != GL_FRONT) {
 165             switch (ctx->Polygon.FrontMode) {
 166             case GL_FILL:
 167                fill_front = CLIP_FILL;
 168                offset_front = 0;
 169                break;
 170             case GL_LINE:
 171                fill_front = CLIP_LINE;
 172                offset_front = ctx->Polygon.OffsetLine;
 173                break;
 174             case GL_POINT:
 175                fill_front = CLIP_POINT;
 176                offset_front = ctx->Polygon.OffsetPoint;
 177                break;
 178             }
 179          }
 180
 181          if (!ctx->Polygon.CullFlag ||
 182              ctx->Polygon.CullFaceMode != GL_BACK) {
 183             switch (ctx->Polygon.BackMode) {
 184             case GL_FILL:
 185                fill_back = CLIP_FILL;
 186                offset_back = 0;
 187                break;
 188             case GL_LINE:
 189                fill_back = CLIP_LINE;
 190                offset_back = ctx->Polygon.OffsetLine;
 191                break;
 192             case GL_POINT:
 193                fill_back = CLIP_POINT;
 194                offset_back = ctx->Polygon.OffsetPoint;
 195                break;
 196             }
 197          }
 198
 199          if (ctx->Polygon.BackMode != GL_FILL ||
 200              ctx->Polygon.FrontMode != GL_FILL) {
 201             key.do_unfilled = 1;
 202
 203             /* Most cases the fixed function units will handle.  Cases where
 204              * one or more polygon faces are unfilled will require help:
 205              */
 206             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 207
 208             if (offset_back || offset_front) {
 209                /* _NEW_POLYGON, _NEW_BUFFERS */
 210                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 211                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 212             }
 213
 214             switch (ctx->Polygon.FrontFace) {
 215             case GL_CCW:
 216                key.fill_ccw = fill_front;
 217                key.fill_cw = fill_back;
 218                key.offset_ccw = offset_front;
 219                key.offset_cw = offset_back;
 220                if (ctx->Light.Model.TwoSide &&
 221                    key.fill_cw != CLIP_CULL)
 222                   key.copy_bfc_cw = 1;
 223                break;
 224             case GL_CW:
 225                key.fill_cw = fill_front;
 226                key.fill_ccw = fill_back;
 227                key.offset_cw = offset_front;
 228                key.offset_ccw = offset_back;
 229                if (ctx->Light.Model.TwoSide &&
 230                    key.fill_ccw != CLIP_CULL)
 231                   key.copy_bfc_ccw = 1;
 232                break;
 233             }
 234          }
 235       }
 236    }
 237
 238    dri_bo_unreference(brw->clip.prog_bo);
 239    brw->clip.prog_bo = brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 240                                         &key, sizeof(key),
 241                                         NULL, 0,
 242                                         &brw->clip.prog_data);
 243    if (brw->clip.prog_bo == NULL)
 244       compile_clip_prog( brw, &key );
 245 }
 246
 247
 248 const struct brw_tracked_state brw_clip_prog = {
 249    .dirty = {
 250       .mesa  = (_NEW_LIGHT |
 251                 _NEW_TRANSFORM |
 252                 _NEW_POLYGON |
 253                 _NEW_BUFFERS),
 254       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 255       .cache = CACHE_NEW_VS_PROG
 256    },
 257    .prepare = upload_clip_prog
 258 };