src/mesa/state_tracker/st_atom_shader.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * State validation for vertex/fragment shaders.
  30  * Note that we have to delay most vertex/fragment shader translation
  31  * until rendering time since the linkage between the vertex outputs and
  32  * fragment inputs can vary depending on the pairing of shaders.
  33  *
  34  * Authors:
  35  *   Brian Paul
  36  */
  37
  38 #include "main/imports.h"
  39 #include "main/mtypes.h"
  40 #include "program/program.h"
  41
  42 #include "pipe/p_context.h"
  43
  44 #include "util/u_simple_shaders.h"
  45
  46 #include "cso_cache/cso_context.h"
  47
  48 #include "st_context.h"
  49 #include "st_atom.h"
  50 #include "st_program.h"
  51
  52
  53
  54 /**
  55  * Translate fragment program if needed.
  56  */
  57 static void
  58 translate_fp(struct st_context *st,
  59              struct st_fragment_program *stfp)
  60 {
  61    if (!stfp->tgsi.tokens) {
  62       assert(stfp->Base.Base.NumInstructions > 0);
  63
  64       st_translate_fragment_program(st, stfp);
  65    }
  66 }
  67
  68 /*
  69  * Translate geometry program if needed.
  70  */
  71 static void
  72 translate_gp(struct st_context *st,
  73              struct st_geometry_program *stgp)
  74 {
  75    if (!stgp->tgsi.tokens) {
  76       assert(stgp->Base.Base.NumInstructions > 1);
  77
  78       st_translate_geometry_program(st, stgp);
  79    }
  80 }
  81
  82 /**
  83  * Find a translated vertex program that corresponds to stvp and
  84  * has outputs matched to stfp's inputs.
  85  * This performs vertex and fragment translation (to TGSI) when needed.
  86  */
  87 static struct st_vp_varient *
  88 find_translated_vp(struct st_context *st,
  89                    struct st_vertex_program *stvp )
  90 {
  91    struct st_vp_varient *vpv;
  92    struct st_vp_varient_key key;
  93
  94    /* Nothing in our key yet.  This will change:
  95     */
  96    memset(&key, 0, sizeof key);
  97
  98    /* When this is true, we will add an extra input to the vertex
  99     * shader translation (for edgeflags), an extra output with
 100     * edgeflag semantics, and extend the vertex shader to pass through
 101     * the input to the output.  We'll need to use similar logic to set
 102     * up the extra vertex_element input for edgeflags.
 103     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
 104     */
 105    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
 106                                 st->ctx->Polygon.FrontMode != GL_FILL ||
 107                                 st->ctx->Polygon.BackMode != GL_FILL));
 108
 109
 110    /* Do we need to throw away old translations after a change in the
 111     * GL program string?
 112     */
 113    if (stvp->serialNo != stvp->lastSerialNo) {
 114       /* These may have changed if the program string changed.
 115        */
 116       st_prepare_vertex_program( st, stvp );
 117
 118       /* We are now up-to-date:
 119        */
 120       stvp->lastSerialNo = stvp->serialNo;
 121    }
 122
 123    /* See if we've got a translated vertex program whose outputs match
 124     * the fragment program's inputs.
 125     */
 126    for (vpv = stvp->varients; vpv; vpv = vpv->next) {
 127       if (memcmp(&vpv->key, &key, sizeof key) == 0) {
 128          break;
 129       }
 130    }
 131
 132    /* No?  Perform new translation here. */
 133    if (!vpv) {
 134       vpv = st_translate_vertex_program(st, stvp, &key);
 135       if (!vpv)
 136          return NULL;
 137
 138       vpv->next = stvp->varients;
 139       stvp->varients = vpv;
 140    }
 141
 142    return vpv;
 143 }
 144
 145
 146 /**
 147  * Return pointer to a pass-through fragment shader.
 148  * This shader is used when a texture is missing/incomplete.
 149  */
 150 static void *
 151 get_passthrough_fs(struct st_context *st)
 152 {
 153    if (!st->passthrough_fs) {
 154       st->passthrough_fs =
 155          util_make_fragment_passthrough_shader(st->pipe);
 156    }
 157
 158    return st->passthrough_fs;
 159 }
 160
 161
 162 /**
 163  * Update fragment program state/atom.  This involves translating the
 164  * Mesa fragment program into a gallium fragment program and binding it.
 165  */
 166 static void
 167 update_fp( struct st_context *st )
 168 {
 169    struct st_fragment_program *stfp;
 170
 171    assert(st->ctx->FragmentProgram._Current);
 172    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
 173    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 174
 175    translate_fp(st, stfp);
 176
 177    st_reference_fragprog(st, &st->fp, stfp);
 178
 179    if (st->missing_textures) {
 180       /* use a pass-through frag shader that uses no textures */
 181       void *fs = get_passthrough_fs(st);
 182       cso_set_fragment_shader_handle(st->cso_context, fs);
 183    }
 184    else {
 185       cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
 186    }
 187 }
 188
 189
 190 const struct st_tracked_state st_update_fp = {
 191    "st_update_fp",                                      /* name */
 192    {                                                    /* dirty */
 193       0,                                                /* mesa */
 194       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 195    },
 196    update_fp                                    /* update */
 197 };
 198
 199
 200
 201 /**
 202  * Update vertex program state/atom.  This involves translating the
 203  * Mesa vertex program into a gallium fragment program and binding it.
 204  */
 205 static void
 206 update_vp( struct st_context *st )
 207 {
 208    struct st_vertex_program *stvp;
 209
 210    /* find active shader and params -- Should be covered by
 211     * ST_NEW_VERTEX_PROGRAM
 212     */
 213    assert(st->ctx->VertexProgram._Current);
 214    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 215    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 216
 217    st->vp_varient = find_translated_vp(st, stvp);
 218
 219    st_reference_vertprog(st, &st->vp, stvp);
 220
 221    cso_set_vertex_shader_handle(st->cso_context,
 222                                 st->vp_varient->driver_shader);
 223
 224    st->vertex_result_to_slot = stvp->result_to_output;
 225 }
 226
 227
 228 const struct st_tracked_state st_update_vp = {
 229    "st_update_vp",                                      /* name */
 230    {                                                    /* dirty */
 231       _NEW_POLYGON,                                     /* mesa */
 232       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 233    },
 234    update_vp                                    /* update */
 235 };
 236
 237 static void
 238 update_gp( struct st_context *st )
 239 {
 240
 241    struct st_geometry_program *stgp;
 242
 243    if (!st->ctx->GeometryProgram._Current) {
 244       cso_set_geometry_shader_handle(st->cso_context, NULL);
 245       return;
 246    }
 247
 248    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 249    assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
 250
 251    translate_gp(st, stgp);
 252
 253    st_reference_geomprog(st, &st->gp, stgp);
 254
 255    cso_set_geometry_shader_handle(st->cso_context, stgp->driver_shader);
 256 }
 257
 258 const struct st_tracked_state st_update_gp = {
 259    "st_update_gp",                                      /* name */
 260    {                                                    /* dirty */
 261       0,                                                /* mesa */
 262       ST_NEW_GEOMETRY_PROGRAM                           /* st */
 263    },
 264    update_gp                                    /* update */
 265 };