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 "program/program.h"
  41
  42 #include "pipe/p_context.h"
  43
  44 #include "util/u_simple_shaders.h"
  45
  46 #include "cso_cache/cso_context.h"
  47
  48 #include "st_context.h"
  49 #include "st_atom.h"
  50 #include "st_program.h"
  51
  52
  53 /**
  54  * Return pointer to a pass-through fragment shader.
  55  * This shader is used when a texture is missing/incomplete.
  56  */
  57 static void *
  58 get_passthrough_fs(struct st_context *st)
  59 {
  60    if (!st->passthrough_fs) {
  61       st->passthrough_fs =
  62          util_make_fragment_passthrough_shader(st->pipe);
  63    }
  64
  65    return st->passthrough_fs;
  66 }
  67
  68
  69 /**
  70  * Update fragment program state/atom.  This involves translating the
  71  * Mesa fragment program into a gallium fragment program and binding it.
  72  */
  73 static void
  74 update_fp( struct st_context *st )
  75 {
  76    struct st_fragment_program *stfp;
  77    struct st_fp_variant_key key;
  78
  79    assert(st->ctx->FragmentProgram._Current);
  80    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
  81    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
  82
  83    memset(&key, 0, sizeof(key));
  84    key.st = st;
  85
  86    st->fp_variant = st_get_fp_variant(st, stfp, &key);
  87
  88    st_reference_fragprog(st, &st->fp, stfp);
  89
  90    if (st->missing_textures) {
  91       /* use a pass-through frag shader that uses no textures */
  92       void *fs = get_passthrough_fs(st);
  93       cso_set_fragment_shader_handle(st->cso_context, fs);
  94    }
  95    else {
  96       cso_set_fragment_shader_handle(st->cso_context,
  97                                      st->fp_variant->driver_shader);
  98    }
  99 }
 100
 101
 102 const struct st_tracked_state st_update_fp = {
 103    "st_update_fp",                                      /* name */
 104    {                                                    /* dirty */
 105       0,                                                /* mesa */
 106       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 107    },
 108    update_fp                                    /* update */
 109 };
 110
 111
 112
 113 /**
 114  * Update vertex program state/atom.  This involves translating the
 115  * Mesa vertex program into a gallium fragment program and binding it.
 116  */
 117 static void
 118 update_vp( struct st_context *st )
 119 {
 120    struct st_vertex_program *stvp;
 121    struct st_vp_variant_key key;
 122
 123    /* find active shader and params -- Should be covered by
 124     * ST_NEW_VERTEX_PROGRAM
 125     */
 126    assert(st->ctx->VertexProgram._Current);
 127    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 128    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 129
 130    memset(&key, 0, sizeof key);
 131    key.st = st;  /* variants are per-context */
 132
 133    /* When this is true, we will add an extra input to the vertex
 134     * shader translation (for edgeflags), an extra output with
 135     * edgeflag semantics, and extend the vertex shader to pass through
 136     * the input to the output.  We'll need to use similar logic to set
 137     * up the extra vertex_element input for edgeflags.
 138     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
 139     */
 140    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
 141                                 st->ctx->Polygon.FrontMode != GL_FILL ||
 142                                 st->ctx->Polygon.BackMode != GL_FILL));
 143
 144    st->vp_variant = st_get_vp_variant(st, stvp, &key);
 145
 146    st_reference_vertprog(st, &st->vp, stvp);
 147
 148    cso_set_vertex_shader_handle(st->cso_context,
 149                                 st->vp_variant->driver_shader);
 150
 151    st->vertex_result_to_slot = stvp->result_to_output;
 152 }
 153
 154
 155 const struct st_tracked_state st_update_vp = {
 156    "st_update_vp",                                      /* name */
 157    {                                                    /* dirty */
 158       _NEW_POLYGON,                                     /* mesa */
 159       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 160    },
 161    update_vp                                            /* update */
 162 };
 163
 164
 165
 166 static void
 167 update_gp( struct st_context *st )
 168 {
 169    struct st_geometry_program *stgp;
 170    struct st_gp_variant_key key;
 171
 172    if (!st->ctx->GeometryProgram._Current) {
 173       cso_set_geometry_shader_handle(st->cso_context, NULL);
 174       return;
 175    }
 176
 177    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 178    assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
 179
 180    memset(&key, 0, sizeof(key));
 181    key.st = st;
 182
 183    st->gp_variant = st_get_gp_variant(st, stgp, &key);
 184
 185    st_reference_geomprog(st, &st->gp, stgp);
 186
 187    cso_set_geometry_shader_handle(st->cso_context,
 188                                   st->gp_variant->driver_shader);
 189 }
 190
 191 const struct st_tracked_state st_update_gp = {
 192    "st_update_gp",                      /* name */
 193    {                                    /* dirty */
 194       0,                                /* mesa */
 195       ST_NEW_GEOMETRY_PROGRAM           /* st */
 196    },
 197    update_gp                            /* update */
 198 };