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 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    if (!brw_state_dirty(brw,
 142                         _NEW_BUFFERS |
 143                         _NEW_LIGHT |
 144                         _NEW_POLYGON |
 145                         _NEW_TRANSFORM,
 146                         BRW_NEW_BLORP |
 147                         BRW_NEW_INTERPOLATION_MAP |
 148                         BRW_NEW_REDUCED_PRIMITIVE |
 149                         BRW_NEW_VUE_MAP_GEOM_OUT))
 150       return;
 151
 152    memset(&key, 0, sizeof(key));
 153
 154    /* Populate the key:
 155     */
 156
 157    /* BRW_NEW_INTERPOLATION_MAP */
 158    key.interpolation_mode = brw->interpolation_mode;
 159
 160    /* BRW_NEW_REDUCED_PRIMITIVE */
 161    key.primitive = brw->reduced_primitive;
 162    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 163    key.attrs = brw->vue_map_geom_out.slots_valid;
 164
 165    /* _NEW_LIGHT */
 166    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 167    /* _NEW_TRANSFORM (also part of VUE map)*/
 168    if (ctx->Transform.ClipPlanesEnabled)
 169       key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 170
 171    if (brw->gen == 5)
 172        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 173    else
 174        key.clip_mode = BRW_CLIPMODE_NORMAL;
 175
 176    /* _NEW_POLYGON */
 177    if (key.primitive == GL_TRIANGLES) {
 178       if (ctx->Polygon.CullFlag &&
 179           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 180          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 181       else {
 182          GLuint fill_front = CLIP_CULL;
 183          GLuint fill_back = CLIP_CULL;
 184          GLuint offset_front = 0;
 185          GLuint offset_back = 0;
 186
 187          if (!ctx->Polygon.CullFlag ||
 188              ctx->Polygon.CullFaceMode != GL_FRONT) {
 189             switch (ctx->Polygon.FrontMode) {
 190             case GL_FILL:
 191                fill_front = CLIP_FILL;
 192                offset_front = 0;
 193                break;
 194             case GL_LINE:
 195                fill_front = CLIP_LINE;
 196                offset_front = ctx->Polygon.OffsetLine;
 197                break;
 198             case GL_POINT:
 199                fill_front = CLIP_POINT;
 200                offset_front = ctx->Polygon.OffsetPoint;
 201                break;
 202             }
 203          }
 204
 205          if (!ctx->Polygon.CullFlag ||
 206              ctx->Polygon.CullFaceMode != GL_BACK) {
 207             switch (ctx->Polygon.BackMode) {
 208             case GL_FILL:
 209                fill_back = CLIP_FILL;
 210                offset_back = 0;
 211                break;
 212             case GL_LINE:
 213                fill_back = CLIP_LINE;
 214                offset_back = ctx->Polygon.OffsetLine;
 215                break;
 216             case GL_POINT:
 217                fill_back = CLIP_POINT;
 218                offset_back = ctx->Polygon.OffsetPoint;
 219                break;
 220             }
 221          }
 222
 223          if (ctx->Polygon.BackMode != GL_FILL ||
 224              ctx->Polygon.FrontMode != GL_FILL) {
 225             key.do_unfilled = 1;
 226
 227             /* Most cases the fixed function units will handle.  Cases where
 228              * one or more polygon faces are unfilled will require help:
 229              */
 230             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 231
 232             if (offset_back || offset_front) {
 233                /* _NEW_POLYGON, _NEW_BUFFERS */
 234                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
 235                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 236                key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
 237             }
 238
 239             if (!ctx->Polygon._FrontBit) {
 240                key.fill_ccw = fill_front;
 241                key.fill_cw = fill_back;
 242                key.offset_ccw = offset_front;
 243                key.offset_cw = offset_back;
 244                if (ctx->Light.Model.TwoSide &&
 245                    key.fill_cw != CLIP_CULL)
 246                   key.copy_bfc_cw = 1;
 247             } else {
 248                key.fill_cw = fill_front;
 249                key.fill_ccw = fill_back;
 250                key.offset_cw = offset_front;
 251                key.offset_ccw = offset_back;
 252                if (ctx->Light.Model.TwoSide &&
 253                    key.fill_ccw != CLIP_CULL)
 254                   key.copy_bfc_ccw = 1;
 255             }
 256          }
 257       }
 258    }
 259
 260    if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG,
 261                          &key, sizeof(key),
 262                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 263       compile_clip_prog( brw, &key );
 264    }
 265 }