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 #include "compiler/nir/nir.h"
  33 #include "main/macros.h"
  34 #include "main/mtypes.h"
  35 #include "main/enums.h"
  36 #include "main/fbobject.h"
  37
  38 #include "intel_batchbuffer.h"
  39
  40 #include "brw_defines.h"
  41 #include "brw_context.h"
  42 #include "brw_eu.h"
  43 #include "brw_util.h"
  44 #include "brw_sf.h"
  45 #include "brw_state.h"
  46
  47 #include "util/ralloc.h"
  48
  49 static void compile_sf_prog( struct brw_context *brw,
  50                              struct brw_sf_prog_key *key )
  51 {
  52    struct brw_sf_compile c;
  53    const GLuint *program;
  54    void *mem_ctx;
  55    GLuint program_size;
  56
  57    memset(&c, 0, sizeof(c));
  58
  59    mem_ctx = ralloc_context(NULL);
  60    /* Begin the compilation:
  61     */
  62    brw_init_codegen(&brw->screen->devinfo, &c.func, mem_ctx);
  63
  64    c.key = *key;
  65    c.vue_map = brw->vue_map_geom_out;
  66    if (c.key.do_point_coord) {
  67       /*
  68        * gl_PointCoord is a FS instead of VS builtin variable, thus it's
  69        * not included in c.vue_map generated in VS stage. Here we add
  70        * it manually to let SF shader generate the needed interpolation
  71        * coefficient for FS shader.
  72        */
  73       c.vue_map.varying_to_slot[BRW_VARYING_SLOT_PNTC] = c.vue_map.num_slots;
  74       c.vue_map.slot_to_varying[c.vue_map.num_slots++] = BRW_VARYING_SLOT_PNTC;
  75    }
  76    c.urb_entry_read_offset = BRW_SF_URB_ENTRY_READ_OFFSET;
  77    c.nr_attr_regs = (c.vue_map.num_slots + 1)/2 - c.urb_entry_read_offset;
  78    c.nr_setup_regs = c.nr_attr_regs;
  79
  80    c.prog_data.urb_read_length = c.nr_attr_regs;
  81    c.prog_data.urb_entry_size = c.nr_setup_regs * 2;
  82
  83    /* Which primitive?  Or all three?
  84     */
  85    switch (key->primitive) {
  86    case SF_TRIANGLES:
  87       c.nr_verts = 3;
  88       brw_emit_tri_setup( &c, true );
  89       break;
  90    case SF_LINES:
  91       c.nr_verts = 2;
  92       brw_emit_line_setup( &c, true );
  93       break;
  94    case SF_POINTS:
  95       c.nr_verts = 1;
  96       if (key->do_point_sprite)
  97           brw_emit_point_sprite_setup( &c, true );
  98       else
  99           brw_emit_point_setup( &c, true );
 100       break;
 101    case SF_UNFILLED_TRIS:
 102       c.nr_verts = 3;
 103       brw_emit_anyprim_setup( &c );
 104       break;
 105    default:
 106       unreachable("not reached");
 107    }
 108
 109    /* FINISHME: SF programs use calculated jumps (i.e., JMPI with a register
 110     * source). Compacting would be difficult.
 111     */
 112    /* brw_compact_instructions(&c.func, 0, 0, NULL); */
 113
 114    /* get the program
 115     */
 116    program = brw_get_program(&c.func, &program_size);
 117
 118    if (unlikely(INTEL_DEBUG & DEBUG_SF)) {
 119       fprintf(stderr, "sf:\n");
 120       brw_disassemble(&brw->screen->devinfo,
 121                       c.func.store, 0, program_size, stderr);
 122       fprintf(stderr, "\n");
 123    }
 124
 125    brw_upload_cache(&brw->cache, BRW_CACHE_SF_PROG,
 126                     &c.key, sizeof(c.key),
 127                     program, program_size,
 128                     &c.prog_data, sizeof(c.prog_data),
 129                     &brw->sf.prog_offset, &brw->sf.prog_data);
 130    ralloc_free(mem_ctx);
 131 }
 132
 133 /* Calculate interpolants for triangle and line rasterization.
 134  */
 135 void
 136 brw_upload_sf_prog(struct brw_context *brw)
 137 {
 138    struct gl_context *ctx = &brw->ctx;
 139    struct brw_sf_prog_key key;
 140
 141    if (!brw_state_dirty(brw,
 142                         _NEW_BUFFERS |
 143                         _NEW_HINT |
 144                         _NEW_LIGHT |
 145                         _NEW_POINT |
 146                         _NEW_POLYGON |
 147                         _NEW_PROGRAM |
 148                         _NEW_TRANSFORM,
 149                         BRW_NEW_BLORP |
 150                         BRW_NEW_FRAGMENT_PROGRAM |
 151                         BRW_NEW_REDUCED_PRIMITIVE |
 152                         BRW_NEW_VUE_MAP_GEOM_OUT))
 153       return;
 154
 155    /* _NEW_BUFFERS */
 156    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 157
 158    memset(&key, 0, sizeof(key));
 159
 160    /* Populate the key, noting state dependencies:
 161     */
 162    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 163    key.attrs = brw->vue_map_geom_out.slots_valid;
 164
 165    /* BRW_NEW_REDUCED_PRIMITIVE */
 166    switch (brw->reduced_primitive) {
 167    case GL_TRIANGLES:
 168       /* NOTE: We just use the edgeflag attribute as an indicator that
 169        * unfilled triangles are active.  We don't actually do the
 170        * edgeflag testing here, it is already done in the clip
 171        * program.
 172        */
 173       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 174          key.primitive = SF_UNFILLED_TRIS;
 175       else
 176          key.primitive = SF_TRIANGLES;
 177       break;
 178    case GL_LINES:
 179       key.primitive = SF_LINES;
 180       break;
 181    case GL_POINTS:
 182       key.primitive = SF_POINTS;
 183       break;
 184    }
 185
 186    /* _NEW_TRANSFORM */
 187    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 188
 189    /* _NEW_POINT */
 190    key.do_point_sprite = ctx->Point.PointSprite;
 191    if (key.do_point_sprite) {
 192       key.point_sprite_coord_replace = ctx->Point.CoordReplace & 0xff;
 193    }
 194    if (brw->fragment_program->Base.info.inputs_read &
 195        BITFIELD64_BIT(VARYING_SLOT_PNTC)) {
 196       key.do_point_coord = 1;
 197    }
 198
 199    /*
 200     * Window coordinates in a FBO are inverted, which means point
 201     * sprite origin must be inverted, too.
 202     */
 203    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 204       key.sprite_origin_lower_left = true;
 205
 206    const struct gl_fragment_program *fprog = brw->fragment_program;
 207    if (fprog) {
 208       assert(brw->gen < 6);
 209       struct gen4_fragment_program *p = (struct gen4_fragment_program *) fprog;
 210
 211       /* BRW_NEW_FRAGMENT_PROGRAM */
 212       key.contains_flat_varying = p->contains_flat_varying;
 213       key.interp_mode = p->interp_mode;
 214    }
 215
 216    /* _NEW_LIGHT | _NEW_PROGRAM */
 217    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 218                            ctx->VertexProgram._TwoSideEnabled);
 219
 220    /* _NEW_POLYGON */
 221    if (key.do_twoside_color) {
 222       /* If we're rendering to a FBO, we have to invert the polygon
 223        * face orientation, just as we invert the viewport in
 224        * sf_unit_create_from_key().
 225        */
 226       key.frontface_ccw = ctx->Polygon._FrontBit == render_to_fbo;
 227    }
 228
 229    if (!brw_search_cache(&brw->cache, BRW_CACHE_SF_PROG,
 230                          &key, sizeof(key),
 231                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 232       compile_sf_prog( brw, &key );
 233    }
 234 }