src/mesa/drivers/dri/i965/brw_sf.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "main/glheader.h"
  34 #include "main/macros.h"
  35 #include "main/enums.h"
  36
  37 #include "intel_batchbuffer.h"
  38
  39 #include "brw_defines.h"
  40 #include "brw_context.h"
  41 #include "brw_eu.h"
  42 #include "brw_util.h"
  43 #include "brw_sf.h"
  44 #include "brw_state.h"
  45
  46 #include "glsl/ralloc.h"
  47
  48 static void compile_sf_prog( struct brw_context *brw,
  49                              struct brw_sf_prog_key *key )
  50 {
  51    struct intel_context *intel = &brw->intel;
  52    struct brw_sf_compile c;
  53    const GLuint *program;
  54    void *mem_ctx;
  55    GLuint program_size;
  56    GLuint i;
  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->vs.prog_data->vue_map;
  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.vert_result_to_slot[BRW_VERT_RESULT_PNTC] = c.vue_map.num_slots;
  75       c.vue_map.slot_to_vert_result[c.vue_map.num_slots++] = BRW_VERT_RESULT_PNTC;
  76    }
  77    c.urb_entry_read_offset = brw_sf_compute_urb_entry_read_offset(intel);
  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
  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       assert(0);
 108       return;
 109    }
 110
 111    /* get the program
 112     */
 113    program = brw_get_program(&c.func, &program_size);
 114
 115    if (unlikely(INTEL_DEBUG & DEBUG_SF)) {
 116       printf("sf:\n");
 117       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 118          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 119                     intel->gen);
 120       printf("\n");
 121    }
 122
 123    brw_upload_cache(&brw->cache, BRW_SF_PROG,
 124                     &c.key, sizeof(c.key),
 125                     program, program_size,
 126                     &c.prog_data, sizeof(c.prog_data),
 127                     &brw->sf.prog_offset, &brw->sf.prog_data);
 128    ralloc_free(mem_ctx);
 129 }
 130
 131 /* Calculate interpolants for triangle and line rasterization.
 132  */
 133 static void
 134 brw_upload_sf_prog(struct brw_context *brw)
 135 {
 136    struct gl_context *ctx = &brw->intel.ctx;
 137    struct brw_sf_prog_key key;
 138    /* _NEW_BUFFERS */
 139    bool render_to_fbo = ctx->DrawBuffer->Name != 0;
 140
 141    memset(&key, 0, sizeof(key));
 142
 143    /* Populate the key, noting state dependencies:
 144     */
 145    /* CACHE_NEW_VS_PROG */
 146    key.attrs = brw->vs.prog_data->outputs_written;
 147
 148    /* BRW_NEW_REDUCED_PRIMITIVE */
 149    switch (brw->intel.reduced_primitive) {
 150    case GL_TRIANGLES:
 151       /* NOTE: We just use the edgeflag attribute as an indicator that
 152        * unfilled triangles are active.  We don't actually do the
 153        * edgeflag testing here, it is already done in the clip
 154        * program.
 155        */
 156       if (key.attrs & BITFIELD64_BIT(VERT_RESULT_EDGE))
 157          key.primitive = SF_UNFILLED_TRIS;
 158       else
 159          key.primitive = SF_TRIANGLES;
 160       break;
 161    case GL_LINES:
 162       key.primitive = SF_LINES;
 163       break;
 164    case GL_POINTS:
 165       key.primitive = SF_POINTS;
 166       break;
 167    }
 168
 169    /* _NEW_TRANSFORM */
 170    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 171
 172    /* _NEW_POINT */
 173    key.do_point_sprite = ctx->Point.PointSprite;
 174    if (key.do_point_sprite) {
 175       int i;
 176
 177       for (i = 0; i < 8; i++) {
 178          if (ctx->Point.CoordReplace[i])
 179             key.point_sprite_coord_replace |= (1 << i);
 180       }
 181    }
 182    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(FRAG_ATTRIB_PNTC))
 183       key.do_point_coord = 1;
 184    /*
 185     * Window coordinates in a FBO are inverted, which means point
 186     * sprite origin must be inverted, too.
 187     */
 188    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 189       key.sprite_origin_lower_left = true;
 190
 191    /* _NEW_LIGHT */
 192    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 193    key.do_twoside_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide);
 194
 195    /* _NEW_POLYGON */
 196    if (key.do_twoside_color) {
 197       /* If we're rendering to a FBO, we have to invert the polygon
 198        * face orientation, just as we invert the viewport in
 199        * sf_unit_create_from_key().
 200        */
 201       key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW) != render_to_fbo;
 202    }
 203
 204    if (!brw_search_cache(&brw->cache, BRW_SF_PROG,
 205                          &key, sizeof(key),
 206                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 207       compile_sf_prog( brw, &key );
 208    }
 209 }
 210
 211
 212 const struct brw_tracked_state brw_sf_prog = {
 213    .dirty = {
 214       .mesa  = (_NEW_HINT | _NEW_LIGHT | _NEW_POLYGON | _NEW_POINT |
 215                 _NEW_TRANSFORM | _NEW_BUFFERS),
 216       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 217       .cache = CACHE_NEW_VS_PROG
 218    },
 219    .emit = brw_upload_sf_prog
 220 };
 221