src/mesa/drivers/dri/i965/brw_clip.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics 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 <keithw@vmware.com>
  30   */
  31
  32 #include "main/macros.h"
  33 #include "main/enums.h"
  34
  35 #include "intel_batchbuffer.h"
  36
  37 #include "brw_defines.h"
  38 #include "brw_context.h"
  39 #include "brw_eu.h"
  40 #include "brw_util.h"
  41 #include "brw_state.h"
  42 #include "brw_clip.h"
  43
  44 #include "util/ralloc.h"
  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    void *mem_ctx;
  56    GLuint program_size;
  57
  58    memset(&c, 0, sizeof(c));
  59
  60    mem_ctx = ralloc_context(NULL);
  61
  62    /* Begin the compilation:
  63     */
  64    brw_init_codegen(brw->intelScreen->devinfo, &c.func, mem_ctx);
  65
  66    c.func.single_program_flow = 1;
  67
  68    c.key = *key;
  69    c.vue_map = brw->vue_map_geom_out;
  70
  71    c.has_flat_shading =
  72       brw_any_flat_varyings(&key->interpolation_mode);
  73    c.has_noperspective_shading =
  74       brw_any_noperspective_varyings(&key->interpolation_mode);
  75
  76    /* nr_regs is the number of registers filled by reading data from the VUE.
  77     * This program accesses the entire VUE, so nr_regs needs to be the size of
  78     * the VUE (measured in pairs, since two slots are stored in each
  79     * register).
  80     */
  81    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  82
  83    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  84
  85    /* For some reason the thread is spawned with only 4 channels
  86     * unmasked.
  87     */
  88    brw_set_default_mask_control(&c.func, BRW_MASK_DISABLE);
  89
  90
  91    /* Would ideally have the option of producing a program which could
  92     * do all three:
  93     */
  94    switch (key->primitive) {
  95    case GL_TRIANGLES:
  96       if (key->do_unfilled)
  97          brw_emit_unfilled_clip( &c );
  98       else
  99          brw_emit_tri_clip( &c );
 100       break;
 101    case GL_LINES:
 102       brw_emit_line_clip( &c );
 103       break;
 104    case GL_POINTS:
 105       brw_emit_point_clip( &c );
 106       break;
 107    default:
 108       unreachable("not reached");
 109    }
 110
 111    brw_compact_instructions(&c.func, 0, 0, NULL);
 112
 113    /* get the program
 114     */
 115    program = brw_get_program(&c.func, &program_size);
 116
 117    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
 118       fprintf(stderr, "clip:\n");
 119       brw_disassemble(brw->intelScreen->devinfo, c.func.store,
 120                       0, program_size, stderr);
 121       fprintf(stderr, "\n");
 122    }
 123
 124    brw_upload_cache(&brw->cache,
 125                     BRW_CACHE_CLIP_PROG,
 126                     &c.key, sizeof(c.key),
 127                     program, program_size,
 128                     &c.prog_data, sizeof(c.prog_data),
 129                     &brw->clip.prog_offset, &brw->clip.prog_data);
 130    ralloc_free(mem_ctx);
 131 }
 132
 133 /* Calculate interpolants for triangle and line rasterization.
 134  */
 135 static void
 136 brw_upload_clip_prog(struct brw_context *brw)
 137 {
 138    struct gl_context *ctx = &brw->ctx;
 139    struct brw_clip_prog_key key;
 140
 141    memset(&key, 0, sizeof(key));
 142
 143    /* Populate the key:
 144     */
 145
 146    /* BRW_NEW_INTERPOLATION_MAP */
 147    key.interpolation_mode = brw->interpolation_mode;
 148
 149    /* BRW_NEW_REDUCED_PRIMITIVE */
 150    key.primitive = brw->reduced_primitive;
 151    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 152    key.attrs = brw->vue_map_geom_out.slots_valid;
 153
 154    /* _NEW_LIGHT */
 155    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 156    /* _NEW_TRANSFORM (also part of VUE map)*/
 157    if (ctx->Transform.ClipPlanesEnabled)
 158       key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 159
 160    if (brw->gen == 5)
 161        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 162    else
 163        key.clip_mode = BRW_CLIPMODE_NORMAL;
 164
 165    /* _NEW_POLYGON */
 166    if (key.primitive == GL_TRIANGLES) {
 167       if (ctx->Polygon.CullFlag &&
 168           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 169          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 170       else {
 171          GLuint fill_front = CLIP_CULL;
 172          GLuint fill_back = CLIP_CULL;
 173          GLuint offset_front = 0;
 174          GLuint offset_back = 0;
 175
 176          if (!ctx->Polygon.CullFlag ||
 177              ctx->Polygon.CullFaceMode != GL_FRONT) {
 178             switch (ctx->Polygon.FrontMode) {
 179             case GL_FILL:
 180                fill_front = CLIP_FILL;
 181                offset_front = 0;
 182                break;
 183             case GL_LINE:
 184                fill_front = CLIP_LINE;
 185                offset_front = ctx->Polygon.OffsetLine;
 186                break;
 187             case GL_POINT:
 188                fill_front = CLIP_POINT;
 189                offset_front = ctx->Polygon.OffsetPoint;
 190                break;
 191             }
 192          }
 193
 194          if (!ctx->Polygon.CullFlag ||
 195              ctx->Polygon.CullFaceMode != GL_BACK) {
 196             switch (ctx->Polygon.BackMode) {
 197             case GL_FILL:
 198                fill_back = CLIP_FILL;
 199                offset_back = 0;
 200                break;
 201             case GL_LINE:
 202                fill_back = CLIP_LINE;
 203                offset_back = ctx->Polygon.OffsetLine;
 204                break;
 205             case GL_POINT:
 206                fill_back = CLIP_POINT;
 207                offset_back = ctx->Polygon.OffsetPoint;
 208                break;
 209             }
 210          }
 211
 212          if (ctx->Polygon.BackMode != GL_FILL ||
 213              ctx->Polygon.FrontMode != GL_FILL) {
 214             key.do_unfilled = 1;
 215
 216             /* Most cases the fixed function units will handle.  Cases where
 217              * one or more polygon faces are unfilled will require help:
 218              */
 219             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 220
 221             if (offset_back || offset_front) {
 222                /* _NEW_POLYGON, _NEW_BUFFERS */
 223                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
 224                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 225                key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
 226             }
 227
 228             if (!ctx->Polygon._FrontBit) {
 229                key.fill_ccw = fill_front;
 230                key.fill_cw = fill_back;
 231                key.offset_ccw = offset_front;
 232                key.offset_cw = offset_back;
 233                if (ctx->Light.Model.TwoSide &&
 234                    key.fill_cw != CLIP_CULL)
 235                   key.copy_bfc_cw = 1;
 236             } else {
 237                key.fill_cw = fill_front;
 238                key.fill_ccw = fill_back;
 239                key.offset_cw = offset_front;
 240                key.offset_ccw = offset_back;
 241                if (ctx->Light.Model.TwoSide &&
 242                    key.fill_ccw != CLIP_CULL)
 243                   key.copy_bfc_ccw = 1;
 244             }
 245          }
 246       }
 247    }
 248
 249    if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG,
 250                          &key, sizeof(key),
 251                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 252       compile_clip_prog( brw, &key );
 253    }
 254 }
 255
 256
 257 const struct brw_tracked_state brw_clip_prog = {
 258    .dirty = {
 259       .mesa  = _NEW_BUFFERS |
 260                _NEW_LIGHT |
 261                _NEW_POLYGON |
 262                _NEW_TRANSFORM,
 263       .brw   = BRW_NEW_INTERPOLATION_MAP |
 264                BRW_NEW_REDUCED_PRIMITIVE |
 265                BRW_NEW_VUE_MAP_GEOM_OUT,
 266    },
 267    .emit = brw_upload_clip_prog
 268 };