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 #include "pipe/p_shader_tokens.h"
  44
  45 #include "util/u_simple_shaders.h"
  46
  47 #include "cso_cache/cso_context.h"
  48
  49 #include "st_context.h"
  50 #include "st_atom.h"
  51 #include "st_program.h"
  52
  53
  54
  55 /**
  56  * Translate fragment program if needed.
  57  */
  58 static void
  59 translate_fp(struct st_context *st,
  60              struct st_fragment_program *stfp)
  61 {
  62    if (!stfp->tgsi.tokens) {
  63       assert(stfp->Base.Base.NumInstructions > 0);
  64
  65       st_translate_fragment_program(st, stfp);
  66    }
  67 }
  68
  69 /*
  70  * Translate geometry program if needed.
  71  */
  72 static void
  73 translate_gp(struct st_context *st,
  74              struct st_geometry_program *stgp)
  75 {
  76    if (!stgp->tgsi.tokens) {
  77       assert(stgp->Base.Base.NumInstructions > 1);
  78
  79       st_translate_geometry_program(st, stgp);
  80    }
  81 }
  82
  83 /**
  84  * Find a translated vertex program that corresponds to stvp and
  85  * has outputs matched to stfp's inputs.
  86  * This performs vertex and fragment translation (to TGSI) when needed.
  87  */
  88 static struct st_vp_varient *
  89 find_translated_vp(struct st_context *st,
  90                    struct st_vertex_program *stvp )
  91 {
  92    struct st_vp_varient *vpv;
  93    struct st_vp_varient_key key;
  94
  95    /* Nothing in our key yet.  This will change:
  96     */
  97    memset(&key, 0, sizeof key);
  98
  99    /* When this is true, we will add an extra input to the vertex
 100     * shader translation (for edgeflags), an extra output with
 101     * edgeflag semantics, and extend the vertex shader to pass through
 102     * the input to the output.  We'll need to use similar logic to set
 103     * up the extra vertex_element input for edgeflags.
 104     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
 105     */
 106    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
 107                                 st->ctx->Polygon.FrontMode != GL_FILL ||
 108                                 st->ctx->Polygon.BackMode != GL_FILL));
 109
 110
 111    /* Do we need to throw away old translations after a change in the
 112     * GL program string?
 113     */
 114    if (stvp->serialNo != stvp->lastSerialNo) {
 115       /* These may have changed if the program string changed.
 116        */
 117       st_prepare_vertex_program( st, stvp );
 118
 119       /* We are now up-to-date:
 120        */
 121       stvp->lastSerialNo = stvp->serialNo;
 122    }
 123
 124    /* See if we've got a translated vertex program whose outputs match
 125     * the fragment program's inputs.
 126     */
 127    for (vpv = stvp->varients; vpv; vpv = vpv->next) {
 128       if (memcmp(&vpv->key, &key, sizeof key) == 0) {
 129          break;
 130       }
 131    }
 132
 133    /* No?  Perform new translation here. */
 134    if (!vpv) {
 135       vpv = st_translate_vertex_program(st, stvp, &key);
 136       if (!vpv)
 137          return NULL;
 138
 139       vpv->next = stvp->varients;
 140       stvp->varients = vpv;
 141    }
 142
 143    return vpv;
 144 }
 145
 146
 147 /**
 148  * Return pointer to a pass-through fragment shader.
 149  * This shader is used when a texture is missing/incomplete.
 150  */
 151 static void *
 152 get_passthrough_fs(struct st_context *st)
 153 {
 154    if (!st->passthrough_fs) {
 155       st->passthrough_fs =
 156          util_make_fragment_passthrough_shader(st->pipe);
 157    }
 158
 159    return st->passthrough_fs;
 160 }
 161
 162
 163 /**
 164  * Update fragment program state/atom.  This involves translating the
 165  * Mesa fragment program into a gallium fragment program and binding it.
 166  */
 167 static void
 168 update_fp( struct st_context *st )
 169 {
 170    struct st_fragment_program *stfp;
 171
 172    assert(st->ctx->FragmentProgram._Current);
 173    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
 174    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 175
 176    translate_fp(st, stfp);
 177
 178    st_reference_fragprog(st, &st->fp, stfp);
 179
 180    if (st->missing_textures) {
 181       /* use a pass-through frag shader that uses no textures */
 182       void *fs = get_passthrough_fs(st);
 183       cso_set_fragment_shader_handle(st->cso_context, fs);
 184    }
 185    else {
 186       cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
 187    }
 188 }
 189
 190
 191 const struct st_tracked_state st_update_fp = {
 192    "st_update_fp",                                      /* name */
 193    {                                                    /* dirty */
 194       0,                                                /* mesa */
 195       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 196    },
 197    update_fp                                    /* update */
 198 };
 199
 200
 201
 202 /**
 203  * Update vertex program state/atom.  This involves translating the
 204  * Mesa vertex program into a gallium fragment program and binding it.
 205  */
 206 static void
 207 update_vp( struct st_context *st )
 208 {
 209    struct st_vertex_program *stvp;
 210
 211    /* find active shader and params -- Should be covered by
 212     * ST_NEW_VERTEX_PROGRAM
 213     */
 214    assert(st->ctx->VertexProgram._Current);
 215    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 216    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 217
 218    st->vp_varient = find_translated_vp(st, stvp);
 219
 220    st_reference_vertprog(st, &st->vp, stvp);
 221
 222    cso_set_vertex_shader_handle(st->cso_context,
 223                                 st->vp_varient->driver_shader);
 224
 225    st->vertex_result_to_slot = stvp->result_to_output;
 226 }
 227
 228
 229 const struct st_tracked_state st_update_vp = {
 230    "st_update_vp",                                      /* name */
 231    {                                                    /* dirty */
 232       _NEW_POLYGON,                                     /* mesa */
 233       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 234    },
 235    update_vp                                    /* update */
 236 };
 237
 238 static void
 239 update_gp( struct st_context *st )
 240 {
 241
 242    struct st_geometry_program *stgp;
 243
 244    if (!st->ctx->GeometryProgram._Current) {
 245       cso_set_geometry_shader_handle(st->cso_context, NULL);
 246       return;
 247    }
 248
 249    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 250    assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
 251
 252    translate_gp(st, stgp);
 253
 254    st_reference_geomprog(st, &st->gp, stgp);
 255
 256    cso_set_geometry_shader_handle(st->cso_context, stgp->driver_shader);
 257 }
 258
 259 const struct st_tracked_state st_update_gp = {
 260    "st_update_gp",                                      /* name */
 261    {                                                    /* dirty */
 262       0,                                                /* mesa */
 263       ST_NEW_GEOMETRY_PROGRAM                           /* st */
 264    },
 265    update_gp                                    /* update */
 266 };