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
  55
  56
  57 /**
  58  * Translate fragment program if needed.
  59  */
  60 static void
  61 translate_fp(struct st_context *st,
  62              struct st_fragment_program *stfp)
  63 {
  64    const GLbitfield fragInputsRead = stfp->Base.Base.InputsRead;
  65
  66    if (!stfp->state.tokens) {
  67       GLuint inAttr, numIn = 0;
  68
  69       for (inAttr = 0; inAttr < FRAG_ATTRIB_MAX; inAttr++) {
  70          if (fragInputsRead & (1 << inAttr)) {
  71             stfp->input_to_slot[inAttr] = numIn;
  72             numIn++;
  73          }
  74          else {
  75             stfp->input_to_slot[inAttr] = -1;
  76          }
  77       }
  78
  79       stfp->num_input_slots = numIn;
  80
  81       assert(stfp->Base.Base.NumInstructions > 0);
  82
  83       st_translate_fragment_program(st, stfp, stfp->input_to_slot);
  84    }
  85 }
  86
  87
  88
  89 /**
  90  * Find a translated vertex program that corresponds to stvp and
  91  * has outputs matched to stfp's inputs.
  92  * This performs vertex and fragment translation (to TGSI) when needed.
  93  */
  94 static struct st_vp_varient *
  95 find_translated_vp(struct st_context *st,
  96                    struct st_vertex_program *stvp )
  97 {
  98    struct st_vp_varient *vpv;
  99    struct st_vp_varient_key key;
 100
 101    /* Nothing in our key yet.  This will change:
 102     */
 103    memset(&key, 0, sizeof key);
 104
 105    /* When this is true, we will add an extra input to the vertex
 106     * shader translation (for edgeflags), an extra output with
 107     * edgeflag semantics, and extend the vertex shader to pass through
 108     * the input to the output.  We'll need to use similar logic to set
 109     * up the extra vertex_element input for edgeflags.
 110     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
 111     */
 112    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
 113                                 st->ctx->Polygon.FrontMode != GL_FILL ||
 114                                 st->ctx->Polygon.BackMode != GL_FILL));
 115
 116
 117    /* Do we need to throw away old translations after a change in the
 118     * GL program string?
 119     */
 120    if (stvp->serialNo != stvp->lastSerialNo) {
 121       /* These may have changed if the program string changed.
 122        */
 123       st_prepare_vertex_program( st, stvp );
 124
 125       /* We are now up-to-date:
 126        */
 127       stvp->lastSerialNo = stvp->serialNo;
 128    }
 129
 130    /* See if we've got a translated vertex program whose outputs match
 131     * the fragment program's inputs.
 132     */
 133    for (vpv = stvp->varients; vpv; vpv = vpv->next) {
 134       if (memcmp(&vpv->key, &key, sizeof key) == 0) {
 135          break;
 136       }
 137    }
 138
 139    /* No?  Perform new translation here. */
 140    if (!vpv) {
 141       vpv = st_translate_vertex_program(st, stvp, &key);
 142       if (!vpv)
 143          return NULL;
 144
 145       vpv->next = stvp->varients;
 146       stvp->varients = vpv;
 147    }
 148
 149    return vpv;
 150 }
 151
 152
 153 /**
 154  * Return pointer to a pass-through fragment shader.
 155  * This shader is used when a texture is missing/incomplete.
 156  */
 157 static void *
 158 get_passthrough_fs(struct st_context *st)
 159 {
 160    if (!st->passthrough_fs) {
 161       st->passthrough_fs =
 162          util_make_fragment_passthrough_shader(st->pipe);
 163    }
 164
 165    return st->passthrough_fs;
 166 }
 167
 168
 169 /**
 170  * Update fragment program state/atom.  This involves translating the
 171  * Mesa fragment program into a gallium fragment program and binding it.
 172  */
 173 static void
 174 update_fp( struct st_context *st )
 175 {
 176    struct st_fragment_program *stfp;
 177
 178    assert(st->ctx->FragmentProgram._Current);
 179    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
 180    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 181
 182    translate_fp(st, stfp);
 183
 184    st_reference_fragprog(st, &st->fp, stfp);
 185
 186    if (st->missing_textures) {
 187       /* use a pass-through frag shader that uses no textures */
 188       void *fs = get_passthrough_fs(st);
 189       cso_set_fragment_shader_handle(st->cso_context, fs);
 190    }
 191    else {
 192       cso_set_fragment_shader_handle(st->cso_context, stfp->driver_shader);
 193    }
 194 }
 195
 196
 197 const struct st_tracked_state st_update_fp = {
 198    "st_update_fp",                                      /* name */
 199    {                                                    /* dirty */
 200       0,                                                /* mesa */
 201       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 202    },
 203    update_fp                                    /* update */
 204 };
 205
 206
 207
 208 /**
 209  * Update vertex program state/atom.  This involves translating the
 210  * Mesa vertex program into a gallium fragment program and binding it.
 211  */
 212 static void
 213 update_vp( struct st_context *st )
 214 {
 215    struct st_vertex_program *stvp;
 216
 217    /* find active shader and params -- Should be covered by
 218     * ST_NEW_VERTEX_PROGRAM
 219     */
 220    assert(st->ctx->VertexProgram._Current);
 221    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 222    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 223
 224    st->vp_varient = find_translated_vp(st, stvp);
 225
 226    st_reference_vertprog(st, &st->vp, stvp);
 227
 228    cso_set_vertex_shader_handle(st->cso_context,
 229                                 st->vp_varient->driver_shader);
 230
 231    st->vertex_result_to_slot = stvp->result_to_output;
 232 }
 233
 234
 235 const struct st_tracked_state st_update_vp = {
 236    "st_update_vp",                                      /* name */
 237    {                                                    /* dirty */
 238       _NEW_POLYGON,                                     /* mesa */
 239       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 240    },
 241    update_vp                                    /* update */
 242 };