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