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
  39
  40 #include "main/imports.h"
  41 #include "main/mtypes.h"
  42 #include "main/macros.h"
  43 #include "shader/program.h"
  44
  45 #include "pipe/p_context.h"
  46 #include "pipe/p_shader_tokens.h"
  47
  48 #include "util/u_simple_shaders.h"
  49
  50 #include "cso_cache/cso_context.h"
  51
  52 #include "st_context.h"
  53 #include "st_atom.h"
  54 #include "st_program.h"
  55 #include "st_atom_shader.h"
  56 #include "st_mesa_to_tgsi.h"
  57
  58
  59
  60
  61
  62 /*
  63  * Translate fragment program if needed.
  64  */
  65 static void
  66 translate_fp(struct st_context *st,
  67              struct st_fragment_program *stfp)
  68 {
  69    const GLbitfield fragInputsRead = stfp->Base.Base.InputsRead;
  70
  71    if (!stfp->state.tokens) {
  72       GLuint inAttr, numIn = 0;
  73
  74       for (inAttr = 0; inAttr < FRAG_ATTRIB_MAX; inAttr++) {
  75          if (fragInputsRead & (1 << inAttr)) {
  76             stfp->input_to_slot[inAttr] = numIn;
  77             numIn++;
  78          }
  79          else {
  80             stfp->input_to_slot[inAttr] = -1;
  81          }
  82       }
  83
  84       stfp->num_input_slots = numIn;
  85
  86       assert(stfp->Base.Base.NumInstructions > 1);
  87
  88       st_translate_fragment_program(st, stfp, stfp->input_to_slot);
  89    }
  90 }
  91
  92
  93
  94 /**
  95  * Find a translated vertex program that corresponds to stvp and
  96  * has outputs matched to stfp's inputs.
  97  * This performs vertex and fragment translation (to TGSI) when needed.
  98  */
  99 static struct st_vp_varient *
 100 find_translated_vp(struct st_context *st,
 101                    struct st_vertex_program *stvp )
 102 {
 103    struct st_vp_varient *vpv;
 104    struct st_vp_varient_key key;
 105
 106    /* Nothing in our key yet.  This will change:
 107     */
 108    memset(&key, 0, sizeof key);
 109
 110    /* When this is true, we will add an extra input to the vertex
 111     * shader translation (for edgeflags), an extra output with
 112     * edgeflag semantics, and extend the vertex shader to pass through
 113     * the input to the output.  We'll need to use similar logic to set
 114     * up the extra vertex_element input for edgeflags.
 115     */
 116    key.passthrough_edgeflags = (st->ctx->Polygon.FrontMode != GL_FILL ||
 117                                 st->ctx->Polygon.BackMode != GL_FILL);
 118
 119
 120    /* Do we need to throw away old translations after a change in the
 121     * GL program string?
 122     */
 123    if (stvp->serialNo != stvp->lastSerialNo) {
 124       /* These may have changed if the program string changed.
 125        */
 126       st_prepare_vertex_program( st, stvp );
 127
 128       /* We are now up-to-date:
 129        */
 130       stvp->lastSerialNo = stvp->serialNo;
 131    }
 132
 133    /* See if we've got a translated vertex program whose outputs match
 134     * the fragment program's inputs.
 135     */
 136    for (vpv = stvp->varients; vpv; vpv = vpv->next) {
 137       if (memcmp(&vpv->key, &key, sizeof key) == 0) {
 138          break;
 139       }
 140    }
 141
 142    /* No?  Perform new translation here. */
 143    if (!vpv) {
 144       vpv = st_translate_vertex_program(st, stvp, &key);
 145       if (!vpv)
 146          return NULL;
 147
 148       vpv->next = stvp->varients;
 149       stvp->varients = vpv;
 150    }
 151
 152    return vpv;
 153 }
 154
 155
 156
 157
 158 static void *
 159 get_passthrough_fs(struct st_context *st)
 160 {
 161    if (!st->passthrough_fs) {
 162       st->passthrough_fs =
 163          util_make_fragment_passthrough_shader(st->pipe);
 164    }
 165
 166    return st->passthrough_fs;
 167 }
 168
 169 static void
 170 update_fp( struct st_context *st )
 171 {
 172    struct st_fragment_program *stfp;
 173
 174    assert(st->ctx->FragmentProgram._Current);
 175    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
 176    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 177
 178    translate_fp(st, stfp);
 179
 180    st_reference_fragprog(st, &st->fp, stfp);
 181
 182    if (st->missing_textures) {
 183       /* use a pass-through frag shader that uses no textures */
 184       void *fs = get_passthrough_fs(st);
 185       cso_set_fragment_shader_handle(st->cso_context, fs);
 186    }
 187    else {
 188       cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
 189    }
 190 }
 191
 192 const struct st_tracked_state st_update_fp = {
 193    "st_update_fp",                                      /* name */
 194    {                                                    /* dirty */
 195       0,                                                /* mesa */
 196       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 197    },
 198    update_fp                                    /* update */
 199 };
 200
 201
 202
 203
 204 static void
 205 update_vp( struct st_context *st )
 206 {
 207    struct st_vertex_program *stvp;
 208
 209    /* find active shader and params -- Should be covered by
 210     * ST_NEW_VERTEX_PROGRAM
 211     */
 212    assert(st->ctx->VertexProgram._Current);
 213    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 214    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 215
 216    st->vp_varient = find_translated_vp(st, stvp);
 217
 218    st_reference_vertprog(st, &st->vp, stvp);
 219
 220    cso_set_vertex_shader_handle(st->cso_context,
 221                                 st->vp_varient->driver_shader);
 222
 223    st->vertex_result_to_slot = stvp->result_to_output;
 224 }
 225
 226
 227 const struct st_tracked_state st_update_vp = {
 228    "st_update_vp",                                      /* name */
 229    {                                                    /* dirty */
 230       _NEW_POLYGON,                                     /* mesa */
 231       ST_NEW_VERTEX_PROGRAM                             /* st */
 232    },
 233    update_vp                                    /* update */
 234 };