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    /* Ignore sample qualifier while computing this flag. */
  93    key.persample_shading =
  94       _mesa_get_min_invocations_per_fragment(st->ctx, &stfp->Base, true) > 1;
  95
  96    st->fp_variant = st_get_fp_variant(st, stfp, &key);
  97
  98    st_reference_fragprog(st, &st->fp, stfp);
  99
 100    if (st->missing_textures) {
 101       /* use a pass-through frag shader that uses no textures */
 102       void *fs = get_passthrough_fs(st);
 103       cso_set_fragment_shader_handle(st->cso_context, fs);
 104    }
 105    else {
 106       cso_set_fragment_shader_handle(st->cso_context,
 107                                      st->fp_variant->driver_shader);
 108    }
 109 }
 110
 111
 112 const struct st_tracked_state st_update_fp = {
 113    "st_update_fp",                                      /* name */
 114    {                                                    /* dirty */
 115       _NEW_BUFFERS | _NEW_MULTISAMPLE,                  /* mesa */
 116       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 117    },
 118    update_fp                                    /* update */
 119 };
 120
 121
 122
 123 /**
 124  * Update vertex program state/atom.  This involves translating the
 125  * Mesa vertex program into a gallium fragment program and binding it.
 126  */
 127 static void
 128 update_vp( struct st_context *st )
 129 {
 130    struct st_vertex_program *stvp;
 131    struct st_vp_variant_key key;
 132
 133    /* find active shader and params -- Should be covered by
 134     * ST_NEW_VERTEX_PROGRAM
 135     */
 136    assert(st->ctx->VertexProgram._Current);
 137    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 138    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 139
 140    memset(&key, 0, sizeof key);
 141    key.st = st;  /* variants are per-context */
 142
 143    /* When this is true, we will add an extra input to the vertex
 144     * shader translation (for edgeflags), an extra output with
 145     * edgeflag semantics, and extend the vertex shader to pass through
 146     * the input to the output.  We'll need to use similar logic to set
 147     * up the extra vertex_element input for edgeflags.
 148     */
 149    key.passthrough_edgeflags = st->vertdata_edgeflags;
 150
 151    key.clamp_color = st->clamp_vert_color_in_shader &&
 152                      st->ctx->Light._ClampVertexColor &&
 153                      (stvp->Base.Base.OutputsWritten &
 154                       (VARYING_SLOT_COL0 |
 155                        VARYING_SLOT_COL1 |
 156                        VARYING_SLOT_BFC0 |
 157                        VARYING_SLOT_BFC1));
 158
 159    st->vp_variant = st_get_vp_variant(st, stvp, &key);
 160
 161    st_reference_vertprog(st, &st->vp, stvp);
 162
 163    cso_set_vertex_shader_handle(st->cso_context,
 164                                 st->vp_variant->driver_shader);
 165
 166    st->vertex_result_to_slot = stvp->result_to_output;
 167 }
 168
 169
 170 const struct st_tracked_state st_update_vp = {
 171    "st_update_vp",                                      /* name */
 172    {                                                    /* dirty */
 173       0,                                                /* mesa */
 174       ST_NEW_VERTEX_PROGRAM                             /* st */
 175    },
 176    update_vp                                            /* update */
 177 };
 178
 179
 180
 181 static void
 182 update_gp( struct st_context *st )
 183 {
 184    struct st_geometry_program *stgp;
 185    struct st_gp_variant_key key;
 186
 187    if (!st->ctx->GeometryProgram._Current) {
 188       cso_set_geometry_shader_handle(st->cso_context, NULL);
 189       return;
 190    }
 191
 192    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 193    assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
 194
 195    memset(&key, 0, sizeof(key));
 196    key.st = st;
 197
 198    st->gp_variant = st_get_gp_variant(st, stgp, &key);
 199
 200    st_reference_geomprog(st, &st->gp, stgp);
 201
 202    cso_set_geometry_shader_handle(st->cso_context,
 203                                   st->gp_variant->driver_shader);
 204 }
 205
 206 const struct st_tracked_state st_update_gp = {
 207    "st_update_gp",                      /* name */
 208    {                                    /* dirty */
 209       0,                                /* mesa */
 210       ST_NEW_GEOMETRY_PROGRAM           /* st */
 211    },
 212    update_gp                            /* update */
 213 };