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