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_util.h"
  40 #include "brw_state.h"
  41 #include "compiler/brw_eu.h"
  42
  43 #include "util/ralloc.h"
  44
  45 static void compile_clip_prog( struct brw_context *brw,
  46                              struct brw_clip_prog_key *key )
  47 {
  48    const unsigned *program;
  49    void *mem_ctx;
  50    unsigned program_size;
  51
  52    mem_ctx = ralloc_context(NULL);
  53
  54    struct brw_clip_prog_data prog_data;
  55    program = brw_compile_clip(brw->screen->compiler, mem_ctx, key, &prog_data,
  56                               &brw->vue_map_geom_out, &program_size);
  57
  58    brw_upload_cache(&brw->cache,
  59                     BRW_CACHE_CLIP_PROG,
  60                     key, sizeof(*key),
  61                     program, program_size,
  62                     &prog_data, sizeof(prog_data),
  63                     &brw->clip.prog_offset, &brw->clip.prog_data);
  64    ralloc_free(mem_ctx);
  65 }
  66
  67 /* Calculate interpolants for triangle and line rasterization.
  68  */
  69 void
  70 brw_upload_clip_prog(struct brw_context *brw)
  71 {
  72    struct gl_context *ctx = &brw->ctx;
  73    struct brw_clip_prog_key key;
  74
  75    if (!brw_state_dirty(brw,
  76                         _NEW_BUFFERS |
  77                         _NEW_LIGHT |
  78                         _NEW_POLYGON |
  79                         _NEW_TRANSFORM,
  80                         BRW_NEW_BLORP |
  81                         BRW_NEW_FS_PROG_DATA |
  82                         BRW_NEW_REDUCED_PRIMITIVE |
  83                         BRW_NEW_VUE_MAP_GEOM_OUT))
  84       return;
  85
  86    memset(&key, 0, sizeof(key));
  87
  88    /* Populate the key:
  89     */
  90
  91    /* BRW_NEW_FS_PROG_DATA */
  92    const struct brw_wm_prog_data *wm_prog_data =
  93       brw_wm_prog_data(brw->wm.base.prog_data);
  94    if (wm_prog_data) {
  95       key.contains_flat_varying = wm_prog_data->contains_flat_varying;
  96       key.contains_noperspective_varying =
  97          wm_prog_data->contains_noperspective_varying;
  98
  99       STATIC_ASSERT(sizeof(key.interp_mode) ==
 100                     sizeof(wm_prog_data->interp_mode));
 101       memcpy(key.interp_mode, wm_prog_data->interp_mode,
 102              sizeof(key.interp_mode));
 103    }
 104
 105    /* BRW_NEW_REDUCED_PRIMITIVE */
 106    key.primitive = brw->reduced_primitive;
 107    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 108    key.attrs = brw->vue_map_geom_out.slots_valid;
 109
 110    /* _NEW_LIGHT */
 111    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 112    /* _NEW_TRANSFORM (also part of VUE map)*/
 113    if (ctx->Transform.ClipPlanesEnabled)
 114       key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 115
 116    if (brw->gen == 5)
 117        key.clip_mode = BRW_CLIP_MODE_KERNEL_CLIP;
 118    else
 119        key.clip_mode = BRW_CLIP_MODE_NORMAL;
 120
 121    /* _NEW_POLYGON */
 122    if (key.primitive == GL_TRIANGLES) {
 123       if (ctx->Polygon.CullFlag &&
 124           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 125          key.clip_mode = BRW_CLIP_MODE_REJECT_ALL;
 126       else {
 127          GLuint fill_front = BRW_CLIP_FILL_MODE_CULL;
 128          GLuint fill_back = BRW_CLIP_FILL_MODE_CULL;
 129          GLuint offset_front = 0;
 130          GLuint offset_back = 0;
 131
 132          if (!ctx->Polygon.CullFlag ||
 133              ctx->Polygon.CullFaceMode != GL_FRONT) {
 134             switch (ctx->Polygon.FrontMode) {
 135             case GL_FILL:
 136                fill_front = BRW_CLIP_FILL_MODE_FILL;
 137                offset_front = 0;
 138                break;
 139             case GL_LINE:
 140                fill_front = BRW_CLIP_FILL_MODE_LINE;
 141                offset_front = ctx->Polygon.OffsetLine;
 142                break;
 143             case GL_POINT:
 144                fill_front = BRW_CLIP_FILL_MODE_POINT;
 145                offset_front = ctx->Polygon.OffsetPoint;
 146                break;
 147             }
 148          }
 149
 150          if (!ctx->Polygon.CullFlag ||
 151              ctx->Polygon.CullFaceMode != GL_BACK) {
 152             switch (ctx->Polygon.BackMode) {
 153             case GL_FILL:
 154                fill_back = BRW_CLIP_FILL_MODE_FILL;
 155                offset_back = 0;
 156                break;
 157             case GL_LINE:
 158                fill_back = BRW_CLIP_FILL_MODE_LINE;
 159                offset_back = ctx->Polygon.OffsetLine;
 160                break;
 161             case GL_POINT:
 162                fill_back = BRW_CLIP_FILL_MODE_POINT;
 163                offset_back = ctx->Polygon.OffsetPoint;
 164                break;
 165             }
 166          }
 167
 168          if (ctx->Polygon.BackMode != GL_FILL ||
 169              ctx->Polygon.FrontMode != GL_FILL) {
 170             key.do_unfilled = 1;
 171
 172             /* Most cases the fixed function units will handle.  Cases where
 173              * one or more polygon faces are unfilled will require help:
 174              */
 175             key.clip_mode = BRW_CLIP_MODE_CLIP_NON_REJECTED;
 176
 177             if (offset_back || offset_front) {
 178                /* _NEW_POLYGON, _NEW_BUFFERS */
 179                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
 180                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 181                key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
 182             }
 183
 184             if (!ctx->Polygon._FrontBit) {
 185                key.fill_ccw = fill_front;
 186                key.fill_cw = fill_back;
 187                key.offset_ccw = offset_front;
 188                key.offset_cw = offset_back;
 189                if (ctx->Light.Model.TwoSide &&
 190                    key.fill_cw != BRW_CLIP_FILL_MODE_CULL)
 191                   key.copy_bfc_cw = 1;
 192             } else {
 193                key.fill_cw = fill_front;
 194                key.fill_ccw = fill_back;
 195                key.offset_cw = offset_front;
 196                key.offset_ccw = offset_back;
 197                if (ctx->Light.Model.TwoSide &&
 198                    key.fill_ccw != BRW_CLIP_FILL_MODE_CULL)
 199                   key.copy_bfc_ccw = 1;
 200             }
 201          }
 202       }
 203    }
 204
 205    if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG,
 206                          &key, sizeof(key),
 207                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 208       compile_clip_prog( brw, &key );
 209    }
 210 }