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/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 intel_context *intel = &brw->intel;
  54    struct brw_sf_compile c;
  55    const GLuint *program;
  56    void *mem_ctx;
  57    GLuint program_size;
  58    GLuint i;
  59
  60    memset(&c, 0, sizeof(c));
  61
  62    mem_ctx = ralloc_context(NULL);
  63    /* Begin the compilation:
  64     */
  65    brw_init_compile(brw, &c.func, mem_ctx);
  66
  67    c.key = *key;
  68    c.vue_map = brw->vs.prog_data->vue_map;
  69    if (c.key.do_point_coord) {
  70       /*
  71        * gl_PointCoord is a FS instead of VS builtin variable, thus it's
  72        * not included in c.vue_map generated in VS stage. Here we add
  73        * it manually to let SF shader generate the needed interpolation
  74        * coefficient for FS shader.
  75        */
  76       c.vue_map.varying_to_slot[BRW_VARYING_SLOT_PNTC] = c.vue_map.num_slots;
  77       c.vue_map.slot_to_varying[c.vue_map.num_slots++] = BRW_VARYING_SLOT_PNTC;
  78    }
  79    c.urb_entry_read_offset = brw_sf_compute_urb_entry_read_offset(intel);
  80    c.nr_attr_regs = (c.vue_map.num_slots + 1)/2 - c.urb_entry_read_offset;
  81    c.nr_setup_regs = c.nr_attr_regs;
  82
  83    c.prog_data.urb_read_length = c.nr_attr_regs;
  84    c.prog_data.urb_entry_size = c.nr_setup_regs * 2;
  85
  86    /* Which primitive?  Or all three?
  87     */
  88    switch (key->primitive) {
  89    case SF_TRIANGLES:
  90       c.nr_verts = 3;
  91       brw_emit_tri_setup( &c, true );
  92       break;
  93    case SF_LINES:
  94       c.nr_verts = 2;
  95       brw_emit_line_setup( &c, true );
  96       break;
  97    case SF_POINTS:
  98       c.nr_verts = 1;
  99       if (key->do_point_sprite)
 100           brw_emit_point_sprite_setup( &c, true );
 101       else
 102           brw_emit_point_setup( &c, true );
 103       break;
 104    case SF_UNFILLED_TRIS:
 105       c.nr_verts = 3;
 106       brw_emit_anyprim_setup( &c );
 107       break;
 108    default:
 109       assert(0);
 110       return;
 111    }
 112
 113    /* get the program
 114     */
 115    program = brw_get_program(&c.func, &program_size);
 116
 117    if (unlikely(INTEL_DEBUG & DEBUG_SF)) {
 118       printf("sf:\n");
 119       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
 120          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
 121                     intel->gen);
 122       printf("\n");
 123    }
 124
 125    brw_upload_cache(&brw->cache, BRW_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 static void
 136 brw_upload_sf_prog(struct brw_context *brw)
 137 {
 138    struct gl_context *ctx = &brw->intel.ctx;
 139    struct brw_sf_prog_key key;
 140    /* _NEW_BUFFERS */
 141    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 142
 143    memset(&key, 0, sizeof(key));
 144
 145    /* Populate the key, noting state dependencies:
 146     */
 147    /* CACHE_NEW_VS_PROG */
 148    key.attrs = brw->vs.prog_data->outputs_written;
 149
 150    /* BRW_NEW_REDUCED_PRIMITIVE */
 151    switch (brw->intel.reduced_primitive) {
 152    case GL_TRIANGLES:
 153       /* NOTE: We just use the edgeflag attribute as an indicator that
 154        * unfilled triangles are active.  We don't actually do the
 155        * edgeflag testing here, it is already done in the clip
 156        * program.
 157        */
 158       if (key.attrs & BITFIELD64_BIT(VARYING_SLOT_EDGE))
 159          key.primitive = SF_UNFILLED_TRIS;
 160       else
 161          key.primitive = SF_TRIANGLES;
 162       break;
 163    case GL_LINES:
 164       key.primitive = SF_LINES;
 165       break;
 166    case GL_POINTS:
 167       key.primitive = SF_POINTS;
 168       break;
 169    }
 170
 171    /* _NEW_TRANSFORM */
 172    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 173
 174    /* _NEW_POINT */
 175    key.do_point_sprite = ctx->Point.PointSprite;
 176    if (key.do_point_sprite) {
 177       int i;
 178
 179       for (i = 0; i < 8; i++) {
 180          if (ctx->Point.CoordReplace[i])
 181             key.point_sprite_coord_replace |= (1 << i);
 182       }
 183    }
 184    if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(VARYING_SLOT_PNTC))
 185       key.do_point_coord = 1;
 186    /*
 187     * Window coordinates in a FBO are inverted, which means point
 188     * sprite origin must be inverted, too.
 189     */
 190    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
 191       key.sprite_origin_lower_left = true;
 192
 193    /* _NEW_LIGHT | _NEW_PROGRAM */
 194    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
 195    key.do_twoside_color = ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) ||
 196                            ctx->VertexProgram._TwoSideEnabled);
 197
 198    /* _NEW_POLYGON */
 199    if (key.do_twoside_color) {
 200       /* If we're rendering to a FBO, we have to invert the polygon
 201        * face orientation, just as we invert the viewport in
 202        * sf_unit_create_from_key().
 203        */
 204       key.frontface_ccw = (ctx->Polygon.FrontFace == GL_CCW) != render_to_fbo;
 205    }
 206
 207    if (!brw_search_cache(&brw->cache, BRW_SF_PROG,
 208                          &key, sizeof(key),
 209                          &brw->sf.prog_offset, &brw->sf.prog_data)) {
 210       compile_sf_prog( brw, &key );
 211    }
 212 }
 213
 214
 215 const struct brw_tracked_state brw_sf_prog = {
 216    .dirty = {
 217       .mesa  = (_NEW_HINT | _NEW_LIGHT | _NEW_POLYGON | _NEW_POINT |
 218                 _NEW_TRANSFORM | _NEW_BUFFERS | _NEW_PROGRAM),
 219       .brw   = (BRW_NEW_REDUCED_PRIMITIVE),
 220       .cache = CACHE_NEW_VS_PROG
 221    },
 222    .emit = brw_upload_sf_prog
 223 };
 224