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