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 "main/macros.h"
  41 #include "shader/program.h"
  42
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_shader_tokens.h"
  45
  46 #include "util/u_simple_shaders.h"
  47
  48 #include "cso_cache/cso_context.h"
  49
  50 #include "st_context.h"
  51 #include "st_atom.h"
  52 #include "st_program.h"
  53
  54
  55
  56 /**
  57  * Translate fragment program if needed.
  58  */
  59 static void
  60 translate_fp(struct st_context *st,
  61              struct st_fragment_program *stfp)
  62 {
  63    if (!stfp->state.tokens) {
  64       assert(stfp->Base.Base.NumInstructions > 0);
  65
  66       st_translate_fragment_program(st, stfp);
  67    }
  68 }
  69
  70
  71
  72 /**
  73  * Find a translated vertex program that corresponds to stvp and
  74  * has outputs matched to stfp's inputs.
  75  * This performs vertex and fragment translation (to TGSI) when needed.
  76  */
  77 static struct st_vp_varient *
  78 find_translated_vp(struct st_context *st,
  79                    struct st_vertex_program *stvp )
  80 {
  81    struct st_vp_varient *vpv;
  82    struct st_vp_varient_key key;
  83
  84    /* Nothing in our key yet.  This will change:
  85     */
  86    memset(&key, 0, sizeof key);
  87
  88    /* When this is true, we will add an extra input to the vertex
  89     * shader translation (for edgeflags), an extra output with
  90     * edgeflag semantics, and extend the vertex shader to pass through
  91     * the input to the output.  We'll need to use similar logic to set
  92     * up the extra vertex_element input for edgeflags.
  93     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
  94     */
  95    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
  96                                 st->ctx->Polygon.FrontMode != GL_FILL ||
  97                                 st->ctx->Polygon.BackMode != GL_FILL));
  98
  99
 100    /* Do we need to throw away old translations after a change in the
 101     * GL program string?
 102     */
 103    if (stvp->serialNo != stvp->lastSerialNo) {
 104       /* These may have changed if the program string changed.
 105        */
 106       st_prepare_vertex_program( st, stvp );
 107
 108       /* We are now up-to-date:
 109        */
 110       stvp->lastSerialNo = stvp->serialNo;
 111    }
 112
 113    /* See if we've got a translated vertex program whose outputs match
 114     * the fragment program's inputs.
 115     */
 116    for (vpv = stvp->varients; vpv; vpv = vpv->next) {
 117       if (memcmp(&vpv->key, &key, sizeof key) == 0) {
 118          break;
 119       }
 120    }
 121
 122    /* No?  Perform new translation here. */
 123    if (!vpv) {
 124       vpv = st_translate_vertex_program(st, stvp, &key);
 125       if (!vpv)
 126          return NULL;
 127
 128       vpv->next = stvp->varients;
 129       stvp->varients = vpv;
 130    }
 131
 132    return vpv;
 133 }
 134
 135
 136 /**
 137  * Return pointer to a pass-through fragment shader.
 138  * This shader is used when a texture is missing/incomplete.
 139  */
 140 static void *
 141 get_passthrough_fs(struct st_context *st)
 142 {
 143    if (!st->passthrough_fs) {
 144       st->passthrough_fs =
 145          util_make_fragment_passthrough_shader(st->pipe);
 146    }
 147
 148    return st->passthrough_fs;
 149 }
 150
 151
 152 /**
 153  * Update fragment program state/atom.  This involves translating the
 154  * Mesa fragment program into a gallium fragment program and binding it.
 155  */
 156 static void
 157 update_fp( struct st_context *st )
 158 {
 159    struct st_fragment_program *stfp;
 160
 161    assert(st->ctx->FragmentProgram._Current);
 162    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
 163    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 164
 165    translate_fp(st, stfp);
 166
 167    st_reference_fragprog(st, &st->fp, stfp);
 168
 169    if (st->missing_textures) {
 170       /* use a pass-through frag shader that uses no textures */
 171       void *fs = get_passthrough_fs(st);
 172       cso_set_fragment_shader_handle(st->cso_context, fs);
 173    }
 174    else {
 175       cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
 176    }
 177 }
 178
 179
 180 const struct st_tracked_state st_update_fp = {
 181    "st_update_fp",                                      /* name */
 182    {                                                    /* dirty */
 183       0,                                                /* mesa */
 184       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 185    },
 186    update_fp                                    /* update */
 187 };
 188
 189
 190
 191 /**
 192  * Update vertex program state/atom.  This involves translating the
 193  * Mesa vertex program into a gallium fragment program and binding it.
 194  */
 195 static void
 196 update_vp( struct st_context *st )
 197 {
 198    struct st_vertex_program *stvp;
 199
 200    /* find active shader and params -- Should be covered by
 201     * ST_NEW_VERTEX_PROGRAM
 202     */
 203    assert(st->ctx->VertexProgram._Current);
 204    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 205    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 206
 207    st->vp_varient = find_translated_vp(st, stvp);
 208
 209    st_reference_vertprog(st, &st->vp, stvp);
 210
 211    cso_set_vertex_shader_handle(st->cso_context,
 212                                 st->vp_varient->driver_shader);
 213
 214    st->vertex_result_to_slot = stvp->result_to_output;
 215 }
 216
 217
 218 const struct st_tracked_state st_update_vp = {
 219    "st_update_vp",                                      /* name */
 220    {                                                    /* dirty */
 221       _NEW_POLYGON,                                     /* mesa */
 222       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 223    },
 224    update_vp                                    /* update */
 225 };