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    brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip,
  75                        c.key.do_twoside_color, c.key.attrs);
  76
  77    /* Need to locate the two positions present in vertex + header.
  78     * These are currently hardcoded:
  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    key.do_twoside_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide);
 178    /* _NEW_TRANSFORM */
 179    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 180
 181    if (intel->gen == 5)
 182        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 183    else
 184        key.clip_mode = BRW_CLIPMODE_NORMAL;
 185
 186    /* _NEW_POLYGON */
 187    if (key.primitive == GL_TRIANGLES) {
 188       if (ctx->Polygon.CullFlag &&
 189           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 190          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 191       else {
 192          GLuint fill_front = CLIP_CULL;
 193          GLuint fill_back = CLIP_CULL;
 194          GLuint offset_front = 0;
 195          GLuint offset_back = 0;
 196
 197          if (!ctx->Polygon.CullFlag ||
 198              ctx->Polygon.CullFaceMode != GL_FRONT) {
 199             switch (ctx->Polygon.FrontMode) {
 200             case GL_FILL:
 201                fill_front = CLIP_FILL;
 202                offset_front = 0;
 203                break;
 204             case GL_LINE:
 205                fill_front = CLIP_LINE;
 206                offset_front = ctx->Polygon.OffsetLine;
 207                break;
 208             case GL_POINT:
 209                fill_front = CLIP_POINT;
 210                offset_front = ctx->Polygon.OffsetPoint;
 211                break;
 212             }
 213          }
 214
 215          if (!ctx->Polygon.CullFlag ||
 216              ctx->Polygon.CullFaceMode != GL_BACK) {
 217             switch (ctx->Polygon.BackMode) {
 218             case GL_FILL:
 219                fill_back = CLIP_FILL;
 220                offset_back = 0;
 221                break;
 222             case GL_LINE:
 223                fill_back = CLIP_LINE;
 224                offset_back = ctx->Polygon.OffsetLine;
 225                break;
 226             case GL_POINT:
 227                fill_back = CLIP_POINT;
 228                offset_back = ctx->Polygon.OffsetPoint;
 229                break;
 230             }
 231          }
 232
 233          if (ctx->Polygon.BackMode != GL_FILL ||
 234              ctx->Polygon.FrontMode != GL_FILL) {
 235             key.do_unfilled = 1;
 236
 237             /* Most cases the fixed function units will handle.  Cases where
 238              * one or more polygon faces are unfilled will require help:
 239              */
 240             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 241
 242             if (offset_back || offset_front) {
 243                /* _NEW_POLYGON, _NEW_BUFFERS */
 244                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 245                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 246             }
 247
 248             switch (ctx->Polygon.FrontFace) {
 249             case GL_CCW:
 250                key.fill_ccw = fill_front;
 251                key.fill_cw = fill_back;
 252                key.offset_ccw = offset_front;
 253                key.offset_cw = offset_back;
 254                if (ctx->Light.Model.TwoSide &&
 255                    key.fill_cw != CLIP_CULL)
 256                   key.copy_bfc_cw = 1;
 257                break;
 258             case GL_CW:
 259                key.fill_cw = fill_front;
 260                key.fill_ccw = fill_back;
 261                key.offset_cw = offset_front;
 262                key.offset_ccw = offset_back;
 263                if (ctx->Light.Model.TwoSide &&
 264                    key.fill_ccw != CLIP_CULL)
 265                   key.copy_bfc_ccw = 1;
 266                break;
 267             }
 268          }
 269       }
 270    }
 271
 272    if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 273                          &key, sizeof(key),
 274                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 275       compile_clip_prog( brw, &key );
 276    }
 277 }
 278
 279
 280 const struct brw_tracked_state brw_clip_prog = {
 281    .dirty = {
 282       .mesa  = (_NEW_LIGHT |
 283                 _NEW_TRANSFORM |
 284                 _NEW_POLYGON |
 285                 _NEW_BUFFERS),
 286       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 287       .cache = CACHE_NEW_VS_PROG
 288    },
 289    .prepare = upload_clip_prog
 290 };