src/mesa/drivers/dri/i965/brw_sf.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
  33 #include "main/glheader.h"
  34 #include "main/macros.h"
  35 #include "main/mtypes.h"
  36 #include "main/enums.h"
  37 #include "main/fbobject.h"
  38
  39 #include "intel_batchbuffer.h"
  40
  41 #include "brw_defines.h"
  42 #include "brw_context.h"
  43 #include "brw_eu.h"
  44 #include "brw_util.h"
  45 #include "brw_sf.h"
  46 #include "brw_state.h"
  47
  48 #include "util/ralloc.h"
  49
  50 static void compile_sf_prog( struct brw_context *brw,
  51                              struct brw_sf_prog_key *key )
  52 {
  53    struct brw_sf_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    /* Begin the compilation:
  62     */
  63    brw_init_codegen(brw->intelScreen->devinfo, &c.func, mem_ctx);
  64
  65    c.key = *key;
  66    c.vue_map = brw->vue_map_geom_out;
  67    if (c.key.do_point_coord) {
  68       /*
  69        * gl_PointCoord is a FS instead of VS builtin variable, thus it's
  70        * not included in c.vue_map generated in VS stage. Here we add
  71        * it manually to let SF shader generate the needed interpolation
  72        * coefficient for FS shader.
  73        */
  74       c.vue_map.varying_to_slot[BRW_VARYING_SLOT_PNTC] = c.vue_map.num_slots;
  75       c.vue_map.slot_to_varying[c.vue_map.num_slots++] = BRW_VARYING_SLOT_PNTC;
  76    }
  77    c.urb_entry_read_offset = BRW_SF_URB_ENTRY_READ_OFFSET;
  78    c.nr_attr_regs = (c.vue_map.num_slots + 1)/2 - c.urb_entry_read_offset;
  79    c.nr_setup_regs = c.nr_attr_regs;
  80
  81    c.prog_data.urb_read_length = c.nr_attr_regs;
  82    c.prog_data.urb_entry_size = c.nr_setup_regs * 2;
  83    c.has_flat_shading = brw_any_flat_varyings(&key->interpolation_mode);
  84
  85    /* Which primitive?  Or all three?
  86     */
  87    switch (key->primitive) {
  88    case SF_TRIANGLES:
  89       c.nr_verts = 3;
  90       brw_emit_tri_setup( &c, true );
  91       break;
  92    case SF_LINES:
  93       c.nr_verts = 2;
  94       brw_emit_line_setup( &c, true );
  95       break;
  96    case SF_POINTS:
  97       c.nr_verts = 1;
  98       if (key->do_point_sprite)
  99           brw_emit_point_sprite_setup( &c, true );
 100       else
 101           brw_emit_point_setup( &c, true );
 102       break;
 103    case SF_UNFILLED_TRIS:
 104       c.nr_verts = 3;
 105       brw_emit_anyprim_setup( &c );
 106       break;
 107    default:
 108       unreachable("not reached");
 109    }
 110
 111    /* FINISHME: SF programs use calculated jumps (i.e., JMPI with a register
 112     * source). Compacting would be difficult.
 113     */
 114    /* brw_compact_instructions(&c.func, 0, 0, NULL); */
 115
 116    /* get the program
 117     */
 118    program = brw_get_program(&c.func, &program_size);
 119
 120    if (unlikely(INTEL_DEBUG & DEBUG_SF)) {
 121       fprintf(stderr, "sf:\n");
 122       brw_disassemble(brw->intelScreen->devinfo,
 123                       c.func.store, 0, program_size, stderr);
 124       fprintf(stderr, "\n");
 125    }
 126
 127    brw_upload_cache(&brw->cache, BRW_CACHE_SF_PROG,
 128                     &c.key, sizeof(c.key),
 129                     program, program_size,
 130                     &c.prog_data, sizeof(c.prog_data),
 131                     &brw->sf.prog_offset, &brw->sf.prog_data);
 132    ralloc_free(mem_ctx);
 133 }
 134
 135 /* Calculate interpolants for triangle and line rasterization.
 136  */
 137 static void
 138 brw_upload_sf_prog(struct brw_context *brw)
 139 {
 140    struct gl_context *ctx = &brw->ctx;
 141    struct brw_sf_prog_key key;
 142    /* _NEW_BUFFERS */
 143    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 144
 145    memset(&key, 0, sizeof(key));
 146
 147    /* Populate the key, noting state dependencies:
 148     */
 149    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 150    key.attrs = brw->vue_map_geom_out.slots_valid;
 151
 152    /* BRW_NEW_REDUCED_PRIMITIVE */
 153    switch (brw->reduced_primitive) {
 154    case GL_TRIANGLES:
 155       /* NOTE: We just use the edgeflag attribute as an indicator that
 156        * unfilled triangles are active.  We don't actually do the
 157        * edgeflag testing here, it is already done in the clip
 158        * program.
 159        */
 160       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 161          key.primitive = SF_UNFILLED_TRIS;
 162       else
 163          key.primitive = SF_TRIANGLES;
 164       break;
 165    case GL_LINES:
 166       key.primitive = SF_LINES;
 167       break;
 168    case GL_POINTS:
 169       key.primitive = SF_POINTS;
 170       break;
 171    }
 172
 173    /* _NEW_TRANSFORM */
 174    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 175
 176    /* _NEW_POINT */
 177    key.do_point_sprite = ctx->Point.PointSprite;
 178    if (key.do_point_sprite) {
 179       int i;
 180
 181       for (i = 0; i < 8; i++) {
 182          if (ctx->Point.CoordReplace[i])
 183             key.point_sprite_coord_replace |= (1 << i);
 184       }
 185    }
 186    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(VARYING_SLOT_PNTC))
 187       key.do_point_coord = 1;
 188    /*
 189     * Window coordinates in a FBO are inverted, which means point
 190     * sprite origin must be inverted, too.
 191     */
 192    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 193       key.sprite_origin_lower_left = true;
 194
 195    /* BRW_NEW_INTERPOLATION_MAP */
 196    key.interpolation_mode = brw->interpolation_mode;
 197
 198    /* _NEW_LIGHT | _NEW_PROGRAM */
 199    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 200                            ctx->VertexProgram._TwoSideEnabled);
 201
 202    /* _NEW_POLYGON */
 203    if (key.do_twoside_color) {
 204       /* If we're rendering to a FBO, we have to invert the polygon
 205        * face orientation, just as we invert the viewport in
 206        * sf_unit_create_from_key().
 207        */
 208       key.frontface_ccw = ctx->Polygon._FrontBit == render_to_fbo;
 209    }
 210
 211    if (!brw_search_cache(&brw->cache, BRW_CACHE_SF_PROG,
 212                          &key, sizeof(key),
 213                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 214       compile_sf_prog( brw, &key );
 215    }
 216 }
 217
 218
 219 const struct brw_tracked_state brw_sf_prog = {
 220    .dirty = {
 221       .mesa  = _NEW_BUFFERS |
 222                _NEW_HINT |
 223                _NEW_LIGHT |
 224                _NEW_POINT |
 225                _NEW_POLYGON |
 226                _NEW_PROGRAM |
 227                _NEW_TRANSFORM,
 228       .brw   = BRW_NEW_INTERPOLATION_MAP |
 229                BRW_NEW_REDUCED_PRIMITIVE |
 230                BRW_NEW_VUE_MAP_GEOM_OUT,
 231    },
 232    .emit = brw_upload_sf_prog
 233 };
 234