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/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    c.has_flat_shading = brw_any_flat_varyings(&key->interpolation_mode);
  83
  84    /* Which primitive?  Or all three?
  85     */
  86    switch (key->primitive) {
  87    case SF_TRIANGLES:
  88       c.nr_verts = 3;
  89       brw_emit_tri_setup( &c, true );
  90       break;
  91    case SF_LINES:
  92       c.nr_verts = 2;
  93       brw_emit_line_setup( &c, true );
  94       break;
  95    case SF_POINTS:
  96       c.nr_verts = 1;
  97       if (key->do_point_sprite)
  98           brw_emit_point_sprite_setup( &c, true );
  99       else
 100           brw_emit_point_setup( &c, true );
 101       break;
 102    case SF_UNFILLED_TRIS:
 103       c.nr_verts = 3;
 104       brw_emit_anyprim_setup( &c );
 105       break;
 106    default:
 107       unreachable("not reached");
 108    }
 109
 110    /* FINISHME: SF programs use calculated jumps (i.e., JMPI with a register
 111     * source). Compacting would be difficult.
 112     */
 113    /* brw_compact_instructions(&c.func, 0, 0, NULL); */
 114
 115    /* get the program
 116     */
 117    program = brw_get_program(&c.func, &program_size);
 118
 119    if (unlikely(INTEL_DEBUG & DEBUG_SF)) {
 120       fprintf(stderr, "sf:\n");
 121       brw_disassemble(&brw->screen->devinfo,
 122                       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 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
 142    if (!brw_state_dirty(brw,
 143                         _NEW_BUFFERS |
 144                         _NEW_HINT |
 145                         _NEW_LIGHT |
 146                         _NEW_POINT |
 147                         _NEW_POLYGON |
 148                         _NEW_PROGRAM |
 149                         _NEW_TRANSFORM,
 150                         BRW_NEW_BLORP |
 151                         BRW_NEW_INTERPOLATION_MAP |
 152                         BRW_NEW_REDUCED_PRIMITIVE |
 153                         BRW_NEW_VUE_MAP_GEOM_OUT))
 154       return;
 155
 156    /* _NEW_BUFFERS */
 157    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 158
 159    memset(&key, 0, sizeof(key));
 160
 161    /* Populate the key, noting state dependencies:
 162     */
 163    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 164    key.attrs = brw->vue_map_geom_out.slots_valid;
 165
 166    /* BRW_NEW_REDUCED_PRIMITIVE */
 167    switch (brw->reduced_primitive) {
 168    case GL_TRIANGLES:
 169       /* NOTE: We just use the edgeflag attribute as an indicator that
 170        * unfilled triangles are active.  We don't actually do the
 171        * edgeflag testing here, it is already done in the clip
 172        * program.
 173        */
 174       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 175          key.primitive = SF_UNFILLED_TRIS;
 176       else
 177          key.primitive = SF_TRIANGLES;
 178       break;
 179    case GL_LINES:
 180       key.primitive = SF_LINES;
 181       break;
 182    case GL_POINTS:
 183       key.primitive = SF_POINTS;
 184       break;
 185    }
 186
 187    /* _NEW_TRANSFORM */
 188    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 189
 190    /* _NEW_POINT */
 191    key.do_point_sprite = ctx->Point.PointSprite;
 192    if (key.do_point_sprite) {
 193       key.point_sprite_coord_replace = ctx->Point.CoordReplace & 0xff;
 194    }
 195    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(VARYING_SLOT_PNTC))
 196       key.do_point_coord = 1;
 197    /*
 198     * Window coordinates in a FBO are inverted, which means point
 199     * sprite origin must be inverted, too.
 200     */
 201    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 202       key.sprite_origin_lower_left = true;
 203
 204    /* BRW_NEW_INTERPOLATION_MAP */
 205    key.interpolation_mode = brw->interpolation_mode;
 206
 207    /* _NEW_LIGHT | _NEW_PROGRAM */
 208    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 209                            ctx->VertexProgram._TwoSideEnabled);
 210
 211    /* _NEW_POLYGON */
 212    if (key.do_twoside_color) {
 213       /* If we're rendering to a FBO, we have to invert the polygon
 214        * face orientation, just as we invert the viewport in
 215        * sf_unit_create_from_key().
 216        */
 217       key.frontface_ccw = ctx->Polygon._FrontBit == render_to_fbo;
 218    }
 219
 220    if (!brw_search_cache(&brw->cache, BRW_CACHE_SF_PROG,
 221                          &key, sizeof(key),
 222                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 223       compile_sf_prog( brw, &key );
 224    }
 225 }