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/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 brw_clip_compile c;
  55    const GLuint *program;
  56    void *mem_ctx;
  57    GLuint program_size;
  58    GLuint i;
  59
  60    memset(&c, 0, sizeof(c));
  61
  62    mem_ctx = ralloc_context(NULL);
  63
  64    /* Begin the compilation:
  65     */
  66    brw_init_compile(brw, &c.func, mem_ctx);
  67
  68    c.func.single_program_flow = 1;
  69
  70    c.key = *key;
  71    c.vue_map = brw->vue_map_geom_out;
  72
  73    c.has_flat_shading =
  74       brw_any_flat_varyings(&key->interpolation_mode);
  75    c.has_noperspective_shading =
  76       brw_any_noperspective_varyings(&key->interpolation_mode);
  77
  78    /* nr_regs is the number of registers filled by reading data from the VUE.
  79     * This program accesses the entire VUE, so nr_regs needs to be the size of
  80     * the VUE (measured in pairs, since two slots are stored in each
  81     * register).
  82     */
  83    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  84
  85    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  86
  87    /* For some reason the thread is spawned with only 4 channels
  88     * unmasked.
  89     */
  90    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  91
  92
  93    /* Would ideally have the option of producing a program which could
  94     * do all three:
  95     */
  96    switch (key->primitive) {
  97    case GL_TRIANGLES:
  98       if (key->do_unfilled)
  99          brw_emit_unfilled_clip( &c );
 100       else
 101          brw_emit_tri_clip( &c );
 102       break;
 103    case GL_LINES:
 104       brw_emit_line_clip( &c );
 105       break;
 106    case GL_POINTS:
 107       brw_emit_point_clip( &c );
 108       break;
 109    default:
 110       assert(0);
 111       return;
 112    }
 113
 114
 115
 116    /* get the program
 117     */
 118    program = brw_get_program(&c.func, &program_size);
 119
 120    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
 121       fprintf(stderr, "clip:\n");
 122       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 123          brw_disasm(stderr, &((struct brw_instruction *)program)[i],
 124                     brw->gen);
 125       fprintf(stderr, "\n");
 126    }
 127
 128    brw_upload_cache(&brw->cache,
 129                     BRW_CLIP_PROG,
 130                     &c.key, sizeof(c.key),
 131                     program, program_size,
 132                     &c.prog_data, sizeof(c.prog_data),
 133                     &brw->clip.prog_offset, &brw->clip.prog_data);
 134    ralloc_free(mem_ctx);
 135 }
 136
 137 /* Calculate interpolants for triangle and line rasterization.
 138  */
 139 static void
 140 brw_upload_clip_prog(struct brw_context *brw)
 141 {
 142    struct gl_context *ctx = &brw->ctx;
 143    struct brw_clip_prog_key key;
 144
 145    memset(&key, 0, sizeof(key));
 146
 147    /* Populate the key:
 148     */
 149
 150    /* BRW_NEW_INTERPOLATION_MAP */
 151    key.interpolation_mode = brw->interpolation_mode;
 152
 153    /* BRW_NEW_REDUCED_PRIMITIVE */
 154    key.primitive = brw->reduced_primitive;
 155    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 156    key.attrs = brw->vue_map_geom_out.slots_valid;
 157
 158    /* _NEW_LIGHT */
 159    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 160    /* _NEW_TRANSFORM (also part of VUE map)*/
 161    if (ctx->Transform.ClipPlanesEnabled)
 162       key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 163
 164    if (brw->gen == 5)
 165        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 166    else
 167        key.clip_mode = BRW_CLIPMODE_NORMAL;
 168
 169    /* _NEW_POLYGON */
 170    if (key.primitive == GL_TRIANGLES) {
 171       if (ctx->Polygon.CullFlag &&
 172           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 173          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 174       else {
 175          GLuint fill_front = CLIP_CULL;
 176          GLuint fill_back = CLIP_CULL;
 177          GLuint offset_front = 0;
 178          GLuint offset_back = 0;
 179
 180          if (!ctx->Polygon.CullFlag ||
 181              ctx->Polygon.CullFaceMode != GL_FRONT) {
 182             switch (ctx->Polygon.FrontMode) {
 183             case GL_FILL:
 184                fill_front = CLIP_FILL;
 185                offset_front = 0;
 186                break;
 187             case GL_LINE:
 188                fill_front = CLIP_LINE;
 189                offset_front = ctx->Polygon.OffsetLine;
 190                break;
 191             case GL_POINT:
 192                fill_front = CLIP_POINT;
 193                offset_front = ctx->Polygon.OffsetPoint;
 194                break;
 195             }
 196          }
 197
 198          if (!ctx->Polygon.CullFlag ||
 199              ctx->Polygon.CullFaceMode != GL_BACK) {
 200             switch (ctx->Polygon.BackMode) {
 201             case GL_FILL:
 202                fill_back = CLIP_FILL;
 203                offset_back = 0;
 204                break;
 205             case GL_LINE:
 206                fill_back = CLIP_LINE;
 207                offset_back = ctx->Polygon.OffsetLine;
 208                break;
 209             case GL_POINT:
 210                fill_back = CLIP_POINT;
 211                offset_back = ctx->Polygon.OffsetPoint;
 212                break;
 213             }
 214          }
 215
 216          if (ctx->Polygon.BackMode != GL_FILL ||
 217              ctx->Polygon.FrontMode != GL_FILL) {
 218             key.do_unfilled = 1;
 219
 220             /* Most cases the fixed function units will handle.  Cases where
 221              * one or more polygon faces are unfilled will require help:
 222              */
 223             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 224
 225             if (offset_back || offset_front) {
 226                /* _NEW_POLYGON, _NEW_BUFFERS */
 227                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
 228                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 229             }
 230
 231             switch (ctx->Polygon.FrontFace) {
 232             case GL_CCW:
 233                key.fill_ccw = fill_front;
 234                key.fill_cw = fill_back;
 235                key.offset_ccw = offset_front;
 236                key.offset_cw = offset_back;
 237                if (ctx->Light.Model.TwoSide &&
 238                    key.fill_cw != CLIP_CULL)
 239                   key.copy_bfc_cw = 1;
 240                break;
 241             case GL_CW:
 242                key.fill_cw = fill_front;
 243                key.fill_ccw = fill_back;
 244                key.offset_cw = offset_front;
 245                key.offset_ccw = offset_back;
 246                if (ctx->Light.Model.TwoSide &&
 247                    key.fill_ccw != CLIP_CULL)
 248                   key.copy_bfc_ccw = 1;
 249                break;
 250             }
 251          }
 252       }
 253    }
 254
 255    if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 256                          &key, sizeof(key),
 257                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 258       compile_clip_prog( brw, &key );
 259    }
 260 }
 261
 262
 263 const struct brw_tracked_state brw_clip_prog = {
 264    .dirty = {
 265       .mesa  = (_NEW_LIGHT |
 266                 _NEW_TRANSFORM |
 267                 _NEW_POLYGON |
 268                 _NEW_BUFFERS),
 269       .brw   = (BRW_NEW_REDUCED_PRIMITIVE |
 270                 BRW_NEW_VUE_MAP_GEOM_OUT |
 271                 BRW_NEW_INTERPOLATION_MAP)
 272    },
 273    .emit = brw_upload_clip_prog
 274 };