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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.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 intel_context *intel = &brw->intel;
  55    struct brw_clip_compile c;
  56    const GLuint *program;
  57    void *mem_ctx;
  58    GLuint program_size;
  59    GLuint delta;
  60    GLuint i;
  61    GLuint header_regs;
  62
  63    memset(&c, 0, sizeof(c));
  64
  65    mem_ctx = ralloc_context(NULL);
  66
  67    /* Begin the compilation:
  68     */
  69    brw_init_compile(brw, &c.func, mem_ctx);
  70
  71    c.func.single_program_flow = 1;
  72
  73    c.key = *key;
  74    brw_compute_vue_map(&c.vue_map, intel, c.key.nr_userclip,
  75                        c.key.do_twoside_color, c.key.attrs);
  76
  77    /* Need to locate the two positions present in vertex + header.
  78     * These are currently hardcoded:
  79     */
  80    c.ndc_offset = ATTR_SIZE;
  81
  82    if (intel->gen == 5)
  83       header_regs = 3;
  84    else
  85       header_regs = 1;
  86
  87    delta = header_regs * REG_SIZE;
  88
  89    for (i = 0; i < VERT_RESULT_MAX; i++) {
  90       if (c.key.attrs & BITFIELD64_BIT(i)) {
  91          c.offset[i] = delta;
  92          delta += ATTR_SIZE;
  93
  94          c.idx_to_attr[c.nr_attrs] = i;
  95          c.nr_attrs++;
  96       }
  97    }
  98
  99    /* The vertex attributes start at a URB row-aligned offset after
 100     * the 8-20 dword vertex header, and continue for a URB row-aligned
 101     * length.  nr_regs determines the urb_read_length from the start
 102     * of the header to the end of the vertex data.
 103     */
 104    c.nr_regs = header_regs + (c.nr_attrs + 1) / 2;
 105
 106    c.nr_bytes = c.nr_regs * REG_SIZE;
 107
 108    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
 109
 110    /* For some reason the thread is spawned with only 4 channels
 111     * unmasked.
 112     */
 113    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
 114
 115
 116    /* Would ideally have the option of producing a program which could
 117     * do all three:
 118     */
 119    switch (key->primitive) {
 120    case GL_TRIANGLES:
 121       if (key->do_unfilled)
 122          brw_emit_unfilled_clip( &c );
 123       else
 124          brw_emit_tri_clip( &c );
 125       break;
 126    case GL_LINES:
 127       brw_emit_line_clip( &c );
 128       break;
 129    case GL_POINTS:
 130       brw_emit_point_clip( &c );
 131       break;
 132    default:
 133       assert(0);
 134       return;
 135    }
 136
 137
 138
 139    /* get the program
 140     */
 141    program = brw_get_program(&c.func, &program_size);
 142
 143    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
 144       printf("clip:\n");
 145       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 146          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 147                     intel->gen);
 148       printf("\n");
 149    }
 150
 151    brw_upload_cache(&brw->cache,
 152                     BRW_CLIP_PROG,
 153                     &c.key, sizeof(c.key),
 154                     program, program_size,
 155                     &c.prog_data, sizeof(c.prog_data),
 156                     &brw->clip.prog_offset, &brw->clip.prog_data);
 157    ralloc_free(mem_ctx);
 158 }
 159
 160 /* Calculate interpolants for triangle and line rasterization.
 161  */
 162 static void upload_clip_prog(struct brw_context *brw)
 163 {
 164    struct intel_context *intel = &brw->intel;
 165    struct gl_context *ctx = &intel->ctx;
 166    struct brw_clip_prog_key key;
 167
 168    memset(&key, 0, sizeof(key));
 169
 170    /* Populate the key:
 171     */
 172    /* BRW_NEW_REDUCED_PRIMITIVE */
 173    key.primitive = brw->intel.reduced_primitive;
 174    /* CACHE_NEW_VS_PROG */
 175    key.attrs = brw->vs.prog_data->outputs_written;
 176    /* _NEW_LIGHT */
 177    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 178    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 179    key.do_twoside_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide);
 180    /* _NEW_TRANSFORM */
 181    key.nr_userclip = brw_count_bits(ctx->Transform.ClipPlanesEnabled);
 182
 183    if (intel->gen == 5)
 184        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
 185    else
 186        key.clip_mode = BRW_CLIPMODE_NORMAL;
 187
 188    /* _NEW_POLYGON */
 189    if (key.primitive == GL_TRIANGLES) {
 190       if (ctx->Polygon.CullFlag &&
 191           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 192          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
 193       else {
 194          GLuint fill_front = CLIP_CULL;
 195          GLuint fill_back = CLIP_CULL;
 196          GLuint offset_front = 0;
 197          GLuint offset_back = 0;
 198
 199          if (!ctx->Polygon.CullFlag ||
 200              ctx->Polygon.CullFaceMode != GL_FRONT) {
 201             switch (ctx->Polygon.FrontMode) {
 202             case GL_FILL:
 203                fill_front = CLIP_FILL;
 204                offset_front = 0;
 205                break;
 206             case GL_LINE:
 207                fill_front = CLIP_LINE;
 208                offset_front = ctx->Polygon.OffsetLine;
 209                break;
 210             case GL_POINT:
 211                fill_front = CLIP_POINT;
 212                offset_front = ctx->Polygon.OffsetPoint;
 213                break;
 214             }
 215          }
 216
 217          if (!ctx->Polygon.CullFlag ||
 218              ctx->Polygon.CullFaceMode != GL_BACK) {
 219             switch (ctx->Polygon.BackMode) {
 220             case GL_FILL:
 221                fill_back = CLIP_FILL;
 222                offset_back = 0;
 223                break;
 224             case GL_LINE:
 225                fill_back = CLIP_LINE;
 226                offset_back = ctx->Polygon.OffsetLine;
 227                break;
 228             case GL_POINT:
 229                fill_back = CLIP_POINT;
 230                offset_back = ctx->Polygon.OffsetPoint;
 231                break;
 232             }
 233          }
 234
 235          if (ctx->Polygon.BackMode != GL_FILL ||
 236              ctx->Polygon.FrontMode != GL_FILL) {
 237             key.do_unfilled = 1;
 238
 239             /* Most cases the fixed function units will handle.  Cases where
 240              * one or more polygon faces are unfilled will require help:
 241              */
 242             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
 243
 244             if (offset_back || offset_front) {
 245                /* _NEW_POLYGON, _NEW_BUFFERS */
 246                key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
 247                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
 248             }
 249
 250             switch (ctx->Polygon.FrontFace) {
 251             case GL_CCW:
 252                key.fill_ccw = fill_front;
 253                key.fill_cw = fill_back;
 254                key.offset_ccw = offset_front;
 255                key.offset_cw = offset_back;
 256                if (ctx->Light.Model.TwoSide &&
 257                    key.fill_cw != CLIP_CULL)
 258                   key.copy_bfc_cw = 1;
 259                break;
 260             case GL_CW:
 261                key.fill_cw = fill_front;
 262                key.fill_ccw = fill_back;
 263                key.offset_cw = offset_front;
 264                key.offset_ccw = offset_back;
 265                if (ctx->Light.Model.TwoSide &&
 266                    key.fill_ccw != CLIP_CULL)
 267                   key.copy_bfc_ccw = 1;
 268                break;
 269             }
 270          }
 271       }
 272    }
 273
 274    if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
 275                          &key, sizeof(key),
 276                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
 277       compile_clip_prog( brw, &key );
 278    }
 279 }
 280
 281
 282 const struct brw_tracked_state brw_clip_prog = {
 283    .dirty = {
 284       .mesa  = (_NEW_LIGHT |
 285                 _NEW_TRANSFORM |
 286                 _NEW_POLYGON |
 287                 _NEW_BUFFERS),
 288       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 289       .cache = CACHE_NEW_VS_PROG
 290    },
 291    .prepare = upload_clip_prog
 292 };