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 "glsl/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       assert(0);
 109       return;
 110    }
 111
 112    brw_compact_instructions(&c.func);
 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, c.func.store, 0, program_size, stderr);
 121       fprintf(stderr, "\n");
 122    }
 123
 124    brw_upload_cache(&brw->cache, BRW_SF_PROG,
 125                     &c.key, sizeof(c.key),
 126                     program, program_size,
 127                     &c.prog_data, sizeof(c.prog_data),
 128                     &brw->sf.prog_offset, &brw->sf.prog_data);
 129    ralloc_free(mem_ctx);
 130 }
 131
 132 /* Calculate interpolants for triangle and line rasterization.
 133  */
 134 static void
 135 brw_upload_sf_prog(struct brw_context *brw)
 136 {
 137    struct gl_context *ctx = &brw->ctx;
 138    struct brw_sf_prog_key key;
 139    /* _NEW_BUFFERS */
 140    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 141
 142    memset(&key, 0, sizeof(key));
 143
 144    /* Populate the key, noting state dependencies:
 145     */
 146    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 147    key.attrs = brw->vue_map_geom_out.slots_valid;
 148
 149    /* BRW_NEW_REDUCED_PRIMITIVE */
 150    switch (brw->reduced_primitive) {
 151    case GL_TRIANGLES:
 152       /* NOTE: We just use the edgeflag attribute as an indicator that
 153        * unfilled triangles are active.  We don't actually do the
 154        * edgeflag testing here, it is already done in the clip
 155        * program.
 156        */
 157       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 158          key.primitive = SF_UNFILLED_TRIS;
 159       else
 160          key.primitive = SF_TRIANGLES;
 161       break;
 162    case GL_LINES:
 163       key.primitive = SF_LINES;
 164       break;
 165    case GL_POINTS:
 166       key.primitive = SF_POINTS;
 167       break;
 168    }
 169
 170    /* _NEW_TRANSFORM */
 171    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 172
 173    /* _NEW_POINT */
 174    key.do_point_sprite = ctx->Point.PointSprite;
 175    if (key.do_point_sprite) {
 176       int i;
 177
 178       for (i = 0; i < 8; i++) {
 179          if (ctx->Point.CoordReplace[i])
 180             key.point_sprite_coord_replace |= (1 << i);
 181       }
 182    }
 183    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(VARYING_SLOT_PNTC))
 184       key.do_point_coord = 1;
 185    /*
 186     * Window coordinates in a FBO are inverted, which means point
 187     * sprite origin must be inverted, too.
 188     */
 189    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 190       key.sprite_origin_lower_left = true;
 191
 192    /* BRW_NEW_INTERPOLATION_MAP */
 193    key.interpolation_mode = brw->interpolation_mode;
 194
 195    /* _NEW_LIGHT | _NEW_PROGRAM */
 196    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 197                            ctx->VertexProgram._TwoSideEnabled);
 198
 199    /* _NEW_POLYGON */
 200    if (key.do_twoside_color) {
 201       /* If we're rendering to a FBO, we have to invert the polygon
 202        * face orientation, just as we invert the viewport in
 203        * sf_unit_create_from_key().
 204        */
 205       key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW) != render_to_fbo;
 206    }
 207
 208    if (!brw_search_cache(&brw->cache, BRW_SF_PROG,
 209                          &key, sizeof(key),
 210                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 211       compile_sf_prog( brw, &key );
 212    }
 213 }
 214
 215
 216 const struct brw_tracked_state brw_sf_prog = {
 217    .dirty = {
 218       .mesa  = (_NEW_HINT | _NEW_LIGHT | _NEW_POLYGON | _NEW_POINT |
 219                 _NEW_TRANSFORM | _NEW_BUFFERS | _NEW_PROGRAM),
 220       .brw   = (BRW_NEW_REDUCED_PRIMITIVE |
 221                 BRW_NEW_VUE_MAP_GEOM_OUT |
 222                 BRW_NEW_INTERPOLATION_MAP)
 223    },
 224    .emit = brw_upload_sf_prog
 225 };
 226