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 #include "../glsl/ralloc.h"
  46
  47 #define FRONT_UNFILLED_BIT  0x1
  48 #define BACK_UNFILLED_BIT   0x2
  49
  50
  51 static void compile_clip_prog( struct brw_context *brw,
  52                              struct brw_clip_prog_key *key )
  53 {
  54    struct intel_context *intel = &brw->intel;
  55    struct brw_clip_compile c;
  56    const GLuint *program;
  57    void *mem_ctx;
  58    GLuint program_size;
  59    GLuint delta;
  60    GLuint i;
  61    GLuint header_regs;
  62
  63    memset(&c, 0, sizeof(c));
  64
  65    mem_ctx = ralloc_context(NULL);
  66
  67    /* Begin the compilation:
  68     */
  69    brw_init_compile(brw, &c.func, mem_ctx);
  70
  71    c.func.single_program_flow = 1;
  72
  73    c.key = *key;
  74
  75    /* Need to locate the two positions present in vertex + header.
  76     * These are currently hardcoded:
  77     */
  78    c.header_position_offset = ATTR_SIZE;
  79
  80    if (intel->gen == 5)
  81       header_regs = 3;
  82    else
  83       header_regs = 1;
  84
  85    delta = header_regs * REG_SIZE;
  86
  87    for (i = 0; i < VERT_RESULT_MAX; i++) {
  88       if (c.key.attrs & BITFIELD64_BIT(i)) {
  89          c.offset[i] = delta;
  90          delta += ATTR_SIZE;
  91
  92          c.idx_to_attr[c.nr_attrs] = i;
  93          c.nr_attrs++;
  94       }
  95    }
  96
  97    /* The vertex attributes start at a URB row-aligned offset after
  98     * the 8-20 dword vertex header, and continue for a URB row-aligned
  99     * length.  nr_regs determines the urb_read_length from the start
 100     * of the header to the end of the vertex data.
 101     */
 102    c.nr_regs = header_regs + (c.nr_attrs + 1) / 2;
 103
 104    c.nr_bytes = c.nr_regs * REG_SIZE;
 105
 106    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
 107
 108    /* For some reason the thread is spawned with only 4 channels
 109     * unmasked.
 110     */
 111    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
 112
 113
 114    /* Would ideally have the option of producing a program which could
 115     * do all three:
 116     */
 117    switch (key->primitive) {
 118    case GL_TRIANGLES:
 119       if (key->do_unfilled)
 120          brw_emit_unfilled_clip( &c );
 121       else
 122          brw_emit_tri_clip( &c );
 123       break;
 124    case GL_LINES:
 125       brw_emit_line_clip( &c );
 126       break;
 127    case GL_POINTS:
 128       brw_emit_point_clip( &c );
 129       break;
 130    default:
 131       assert(0);
 132       return;
 133    }
 134
 135
 136
 137    /* get the program
 138     */
 139    program = brw_get_program(&c.func, &program_size);
 140
 141    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
 142       printf("clip:\n");
 143       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 144          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 145                     intel->gen);
 146       printf("\n");
 147    }
 148
 149    brw_upload_cache(&brw->cache,
 150                     BRW_CLIP_PROG,
 151                     &c.key, sizeof(c.key),
 152                     program, program_size,
 153                     &c.prog_data, sizeof(c.prog_data),
 154                     &brw->clip.prog_offset, &brw->clip.prog_data);
 155    ralloc_free(mem_ctx);
 156 }
 157
 158 /* Calculate interpolants for triangle and line rasterization.
 159  */
 160 static void upload_clip_prog(struct brw_context *brw)
 161 {
 162    struct intel_context *intel = &brw->intel;
 163    struct gl_context *ctx = &intel->ctx;
 164    struct brw_clip_prog_key key;
 165
 166    memset(&key, 0, sizeof(key));
 167
 168    /* Populate the key:
 169     */
 170    /* BRW_NEW_REDUCED_PRIMITIVE */
 171    key.primitive = brw->intel.reduced_primitive;
 172    /* CACHE_NEW_VS_PROG */
 173    key.attrs = brw->vs.prog_data->outputs_written;
 174    /* _NEW_LIGHT */
 175    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 176    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 177    /* _NEW_TRANSFORM */
 178    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 179
 180    if (intel->gen == 5)
 181        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 182    else
 183        key.clip_mode = BRW_CLIPMODE_NORMAL;
 184
 185    /* _NEW_POLYGON */
 186    if (key.primitive == GL_TRIANGLES) {
 187       if (ctx->Polygon.CullFlag &&
 188           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 189          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 190       else {
 191          GLuint fill_front = CLIP_CULL;
 192          GLuint fill_back = CLIP_CULL;
 193          GLuint offset_front = 0;
 194          GLuint offset_back = 0;
 195
 196          if (!ctx->Polygon.CullFlag ||
 197              ctx->Polygon.CullFaceMode != GL_FRONT) {
 198             switch (ctx->Polygon.FrontMode) {
 199             case GL_FILL:
 200                fill_front = CLIP_FILL;
 201                offset_front = 0;
 202                break;
 203             case GL_LINE:
 204                fill_front = CLIP_LINE;
 205                offset_front = ctx->Polygon.OffsetLine;
 206                break;
 207             case GL_POINT:
 208                fill_front = CLIP_POINT;
 209                offset_front = ctx->Polygon.OffsetPoint;
 210                break;
 211             }
 212          }
 213
 214          if (!ctx->Polygon.CullFlag ||
 215              ctx->Polygon.CullFaceMode != GL_BACK) {
 216             switch (ctx->Polygon.BackMode) {
 217             case GL_FILL:
 218                fill_back = CLIP_FILL;
 219                offset_back = 0;
 220                break;
 221             case GL_LINE:
 222                fill_back = CLIP_LINE;
 223                offset_back = ctx->Polygon.OffsetLine;
 224                break;
 225             case GL_POINT:
 226                fill_back = CLIP_POINT;
 227                offset_back = ctx->Polygon.OffsetPoint;
 228                break;
 229             }
 230          }
 231
 232          if (ctx->Polygon.BackMode != GL_FILL ||
 233              ctx->Polygon.FrontMode != GL_FILL) {
 234             key.do_unfilled = 1;
 235
 236             /* Most cases the fixed function units will handle.  Cases where
 237              * one or more polygon faces are unfilled will require help:
 238              */
 239             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 240
 241             if (offset_back || offset_front) {
 242                /* _NEW_POLYGON, _NEW_BUFFERS */
 243                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 244                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 245             }
 246
 247             switch (ctx->Polygon.FrontFace) {
 248             case GL_CCW:
 249                key.fill_ccw = fill_front;
 250                key.fill_cw = fill_back;
 251                key.offset_ccw = offset_front;
 252                key.offset_cw = offset_back;
 253                if (ctx->Light.Model.TwoSide &&
 254                    key.fill_cw != CLIP_CULL)
 255                   key.copy_bfc_cw = 1;
 256                break;
 257             case GL_CW:
 258                key.fill_cw = fill_front;
 259                key.fill_ccw = fill_back;
 260                key.offset_cw = offset_front;
 261                key.offset_ccw = offset_back;
 262                if (ctx->Light.Model.TwoSide &&
 263                    key.fill_ccw != CLIP_CULL)
 264                   key.copy_bfc_ccw = 1;
 265                break;
 266             }
 267          }
 268       }
 269    }
 270
 271    if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 272                          &key, sizeof(key),
 273                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 274       compile_clip_prog( brw, &key );
 275    }
 276 }
 277
 278
 279 const struct brw_tracked_state brw_clip_prog = {
 280    .dirty = {
 281       .mesa  = (_NEW_LIGHT |
 282                 _NEW_TRANSFORM |
 283                 _NEW_POLYGON |
 284                 _NEW_BUFFERS),
 285       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 286       .cache = CACHE_NEW_VS_PROG
 287    },
 288    .prepare = upload_clip_prog
 289 };