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    const struct gen_device_info *devinfo = &brw->screen->devinfo;
  73    struct gl_context *ctx = &brw->ctx;
  74    struct brw_clip_prog_key key;
  75
  76    if (!brw_state_dirty(brw,
  77                         _NEW_BUFFERS |
  78                         _NEW_LIGHT |
  79                         _NEW_POLYGON |
  80                         _NEW_TRANSFORM,
  81                         BRW_NEW_BLORP |
  82                         BRW_NEW_FS_PROG_DATA |
  83                         BRW_NEW_REDUCED_PRIMITIVE |
  84                         BRW_NEW_VUE_MAP_GEOM_OUT))
  85       return;
  86
  87    memset(&key, 0, sizeof(key));
  88
  89    /* Populate the key:
  90     */
  91
  92    /* BRW_NEW_FS_PROG_DATA */
  93    const struct brw_wm_prog_data *wm_prog_data =
  94       brw_wm_prog_data(brw->wm.base.prog_data);
  95    if (wm_prog_data) {
  96       key.contains_flat_varying = wm_prog_data->contains_flat_varying;
  97       key.contains_noperspective_varying =
  98          wm_prog_data->contains_noperspective_varying;
  99
 100       STATIC_ASSERT(sizeof(key.interp_mode) ==
 101                     sizeof(wm_prog_data->interp_mode));
 102       memcpy(key.interp_mode, wm_prog_data->interp_mode,
 103              sizeof(key.interp_mode));
 104    }
 105
 106    /* BRW_NEW_REDUCED_PRIMITIVE */
 107    key.primitive = brw->reduced_primitive;
 108    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 109    key.attrs = brw->vue_map_geom_out.slots_valid;
 110
 111    /* _NEW_LIGHT */
 112    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 113    /* _NEW_TRANSFORM (also part of VUE map)*/
 114    if (ctx->Transform.ClipPlanesEnabled)
 115       key.nr_userclip = util_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 116
 117    if (devinfo->gen == 5)
 118        key.clip_mode = BRW_CLIP_MODE_KERNEL_CLIP;
 119    else
 120        key.clip_mode = BRW_CLIP_MODE_NORMAL;
 121
 122    /* _NEW_POLYGON */
 123    if (key.primitive == GL_TRIANGLES) {
 124       if (ctx->Polygon.CullFlag &&
 125           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 126          key.clip_mode = BRW_CLIP_MODE_REJECT_ALL;
 127       else {
 128          GLuint fill_front = BRW_CLIP_FILL_MODE_CULL;
 129          GLuint fill_back = BRW_CLIP_FILL_MODE_CULL;
 130          GLuint offset_front = 0;
 131          GLuint offset_back = 0;
 132
 133          if (!ctx->Polygon.CullFlag ||
 134              ctx->Polygon.CullFaceMode != GL_FRONT) {
 135             switch (ctx->Polygon.FrontMode) {
 136             case GL_FILL:
 137                fill_front = BRW_CLIP_FILL_MODE_FILL;
 138                offset_front = 0;
 139                break;
 140             case GL_LINE:
 141                fill_front = BRW_CLIP_FILL_MODE_LINE;
 142                offset_front = ctx->Polygon.OffsetLine;
 143                break;
 144             case GL_POINT:
 145                fill_front = BRW_CLIP_FILL_MODE_POINT;
 146                offset_front = ctx->Polygon.OffsetPoint;
 147                break;
 148             }
 149          }
 150
 151          if (!ctx->Polygon.CullFlag ||
 152              ctx->Polygon.CullFaceMode != GL_BACK) {
 153             switch (ctx->Polygon.BackMode) {
 154             case GL_FILL:
 155                fill_back = BRW_CLIP_FILL_MODE_FILL;
 156                offset_back = 0;
 157                break;
 158             case GL_LINE:
 159                fill_back = BRW_CLIP_FILL_MODE_LINE;
 160                offset_back = ctx->Polygon.OffsetLine;
 161                break;
 162             case GL_POINT:
 163                fill_back = BRW_CLIP_FILL_MODE_POINT;
 164                offset_back = ctx->Polygon.OffsetPoint;
 165                break;
 166             }
 167          }
 168
 169          if (ctx->Polygon.BackMode != GL_FILL ||
 170              ctx->Polygon.FrontMode != GL_FILL) {
 171             key.do_unfilled = 1;
 172
 173             /* Most cases the fixed function units will handle.  Cases where
 174              * one or more polygon faces are unfilled will require help:
 175              */
 176             key.clip_mode = BRW_CLIP_MODE_CLIP_NON_REJECTED;
 177
 178             if (offset_back || offset_front) {
 179                /* _NEW_POLYGON, _NEW_BUFFERS */
 180                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
 181                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 182                key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
 183             }
 184
 185             if (!brw->polygon_front_bit) {
 186                key.fill_ccw = fill_front;
 187                key.fill_cw = fill_back;
 188                key.offset_ccw = offset_front;
 189                key.offset_cw = offset_back;
 190                if (ctx->Light.Model.TwoSide &&
 191                    key.fill_cw != BRW_CLIP_FILL_MODE_CULL)
 192                   key.copy_bfc_cw = 1;
 193             } else {
 194                key.fill_cw = fill_front;
 195                key.fill_ccw = fill_back;
 196                key.offset_cw = offset_front;
 197                key.offset_ccw = offset_back;
 198                if (ctx->Light.Model.TwoSide &&
 199                    key.fill_ccw != BRW_CLIP_FILL_MODE_CULL)
 200                   key.copy_bfc_ccw = 1;
 201             }
 202          }
 203       }
 204    }
 205
 206    if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG, &key, sizeof(key),
 207                          &brw->clip.prog_offset, &brw->clip.prog_data, true)) {
 208       compile_clip_prog( brw, &key );
 209    }
 210 }