src/mesa/state_tracker/st_atom_shader.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   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 VMWARE 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, TGSI_SEMANTIC_COLOR,
  63                                                TGSI_INTERPOLATE_PERSPECTIVE,
  64                                                TRUE);
  65    }
  66
  67    return st->passthrough_fs;
  68 }
  69
  70
  71 /**
  72  * Update fragment program state/atom.  This involves translating the
  73  * Mesa fragment program into a gallium fragment program and binding it.
  74  */
  75 static void
  76 update_fp( struct st_context *st )
  77 {
  78    struct st_fragment_program *stfp;
  79    struct st_fp_variant_key key;
  80
  81    assert(st->ctx->FragmentProgram._Current);
  82    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
  83    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
  84
  85    memset(&key, 0, sizeof(key));
  86    key.st = st;
  87
  88    /* _NEW_FRAG_CLAMP */
  89    key.clamp_color = st->clamp_frag_color_in_shader &&
  90                      st->ctx->Color._ClampFragmentColor;
  91
  92    st->fp_variant = st_get_fp_variant(st, stfp, &key);
  93
  94    st_reference_fragprog(st, &st->fp, stfp);
  95
  96    if (st->missing_textures) {
  97       /* use a pass-through frag shader that uses no textures */
  98       void *fs = get_passthrough_fs(st);
  99       cso_set_fragment_shader_handle(st->cso_context, fs);
 100    }
 101    else {
 102       cso_set_fragment_shader_handle(st->cso_context,
 103                                      st->fp_variant->driver_shader);
 104    }
 105 }
 106
 107
 108 const struct st_tracked_state st_update_fp = {
 109    "st_update_fp",                                      /* name */
 110    {                                                    /* dirty */
 111       _NEW_BUFFERS,                                     /* mesa */
 112       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 113    },
 114    update_fp                                    /* update */
 115 };
 116
 117
 118
 119 /**
 120  * Update vertex program state/atom.  This involves translating the
 121  * Mesa vertex program into a gallium fragment program and binding it.
 122  */
 123 static void
 124 update_vp( struct st_context *st )
 125 {
 126    struct st_vertex_program *stvp;
 127    struct st_vp_variant_key key;
 128
 129    /* find active shader and params -- Should be covered by
 130     * ST_NEW_VERTEX_PROGRAM
 131     */
 132    assert(st->ctx->VertexProgram._Current);
 133    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 134    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 135
 136    memset(&key, 0, sizeof key);
 137    key.st = st;  /* variants are per-context */
 138
 139    /* When this is true, we will add an extra input to the vertex
 140     * shader translation (for edgeflags), an extra output with
 141     * edgeflag semantics, and extend the vertex shader to pass through
 142     * the input to the output.  We'll need to use similar logic to set
 143     * up the extra vertex_element input for edgeflags.
 144     * _NEW_POLYGON, ST_NEW_EDGEFLAGS_DATA
 145     */
 146    key.passthrough_edgeflags = (st->vertdata_edgeflags && (
 147                                 st->ctx->Polygon.FrontMode != GL_FILL ||
 148                                 st->ctx->Polygon.BackMode != GL_FILL));
 149
 150    key.clamp_color = st->clamp_vert_color_in_shader &&
 151                      st->ctx->Light._ClampVertexColor;
 152
 153    st->vp_variant = st_get_vp_variant(st, stvp, &key);
 154
 155    st_reference_vertprog(st, &st->vp, stvp);
 156
 157    cso_set_vertex_shader_handle(st->cso_context,
 158                                 st->vp_variant->driver_shader);
 159
 160    st->vertex_result_to_slot = stvp->result_to_output;
 161 }
 162
 163
 164 const struct st_tracked_state st_update_vp = {
 165    "st_update_vp",                                      /* name */
 166    {                                                    /* dirty */
 167       _NEW_POLYGON,                                     /* mesa */
 168       ST_NEW_VERTEX_PROGRAM | ST_NEW_EDGEFLAGS_DATA     /* st */
 169    },
 170    update_vp                                            /* update */
 171 };
 172
 173
 174
 175 static void
 176 update_gp( struct st_context *st )
 177 {
 178    struct st_geometry_program *stgp;
 179    struct st_gp_variant_key key;
 180
 181    if (!st->ctx->GeometryProgram._Current) {
 182       cso_set_geometry_shader_handle(st->cso_context, NULL);
 183       return;
 184    }
 185
 186    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 187    assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
 188
 189    memset(&key, 0, sizeof(key));
 190    key.st = st;
 191
 192    st->gp_variant = st_get_gp_variant(st, stgp, &key);
 193
 194    st_reference_geomprog(st, &st->gp, stgp);
 195
 196    cso_set_geometry_shader_handle(st->cso_context,
 197                                   st->gp_variant->driver_shader);
 198 }
 199
 200 const struct st_tracked_state st_update_gp = {
 201    "st_update_gp",                      /* name */
 202    {                                    /* dirty */
 203       0,                                /* mesa */
 204       ST_NEW_GEOMETRY_PROGRAM           /* st */
 205    },
 206    update_gp                            /* update */
 207 };