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_compile(brw, &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, c.func.store, 0, program_size, stderr);
 123       fprintf(stderr, "\n");
 124    }
 125
 126    brw_upload_cache(&brw->cache, BRW_CACHE_SF_PROG,
 127                     &c.key, sizeof(c.key),
 128                     program, program_size,
 129                     &c.prog_data, sizeof(c.prog_data),
 130                     &brw->sf.prog_offset, &brw->sf.prog_data);
 131    ralloc_free(mem_ctx);
 132 }
 133
 134 /* Calculate interpolants for triangle and line rasterization.
 135  */
 136 static void
 137 brw_upload_sf_prog(struct brw_context *brw)
 138 {
 139    struct gl_context *ctx = &brw->ctx;
 140    struct brw_sf_prog_key key;
 141    /* _NEW_BUFFERS */
 142    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 143
 144    memset(&key, 0, sizeof(key));
 145
 146    /* Populate the key, noting state dependencies:
 147     */
 148    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 149    key.attrs = brw->vue_map_geom_out.slots_valid;
 150
 151    /* BRW_NEW_REDUCED_PRIMITIVE */
 152    switch (brw->reduced_primitive) {
 153    case GL_TRIANGLES:
 154       /* NOTE: We just use the edgeflag attribute as an indicator that
 155        * unfilled triangles are active.  We don't actually do the
 156        * edgeflag testing here, it is already done in the clip
 157        * program.
 158        */
 159       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 160          key.primitive = SF_UNFILLED_TRIS;
 161       else
 162          key.primitive = SF_TRIANGLES;
 163       break;
 164    case GL_LINES:
 165       key.primitive = SF_LINES;
 166       break;
 167    case GL_POINTS:
 168       key.primitive = SF_POINTS;
 169       break;
 170    }
 171
 172    /* _NEW_TRANSFORM */
 173    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 174
 175    /* _NEW_POINT */
 176    key.do_point_sprite = ctx->Point.PointSprite;
 177    if (key.do_point_sprite) {
 178       int i;
 179
 180       for (i = 0; i < 8; i++) {
 181          if (ctx->Point.CoordReplace[i])
 182             key.point_sprite_coord_replace |= (1 << i);
 183       }
 184    }
 185    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(VARYING_SLOT_PNTC))
 186       key.do_point_coord = 1;
 187    /*
 188     * Window coordinates in a FBO are inverted, which means point
 189     * sprite origin must be inverted, too.
 190     */
 191    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 192       key.sprite_origin_lower_left = true;
 193
 194    /* BRW_NEW_INTERPOLATION_MAP */
 195    key.interpolation_mode = brw->interpolation_mode;
 196
 197    /* _NEW_LIGHT | _NEW_PROGRAM */
 198    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 199                            ctx->VertexProgram._TwoSideEnabled);
 200
 201    /* _NEW_POLYGON */
 202    if (key.do_twoside_color) {
 203       /* If we're rendering to a FBO, we have to invert the polygon
 204        * face orientation, just as we invert the viewport in
 205        * sf_unit_create_from_key().
 206        */
 207       key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW) != render_to_fbo;
 208    }
 209
 210    if (!brw_search_cache(&brw->cache, BRW_CACHE_SF_PROG,
 211                          &key, sizeof(key),
 212                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 213       compile_sf_prog( brw, &key );
 214    }
 215 }
 216
 217
 218 const struct brw_tracked_state brw_sf_prog = {
 219    .dirty = {
 220       .mesa  = _NEW_BUFFERS |
 221                _NEW_HINT |
 222                _NEW_LIGHT |
 223                _NEW_POINT |
 224                _NEW_POLYGON |
 225                _NEW_PROGRAM |
 226                _NEW_TRANSFORM,
 227       .brw   = BRW_NEW_INTERPOLATION_MAP |
 228                BRW_NEW_REDUCED_PRIMITIVE |
 229                BRW_NEW_VUE_MAP_GEOM_OUT,
 230    },
 231    .emit = brw_upload_sf_prog
 232 };
 233