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 #include "pipe/p_shader_tokens.h"
  44 #include "util/u_simple_shaders.h"
  45 #include "cso_cache/cso_context.h"
  46
  47 #include "st_context.h"
  48 #include "st_atom.h"
  49 #include "st_program.h"
  50
  51
  52 /**
  53  * Return pointer to a pass-through fragment shader.
  54  * This shader is used when a texture is missing/incomplete.
  55  */
  56 static void *
  57 get_passthrough_fs(struct st_context *st)
  58 {
  59    if (!st->passthrough_fs) {
  60       st->passthrough_fs =
  61          util_make_fragment_passthrough_shader(st->pipe, TGSI_SEMANTIC_COLOR,
  62                                                TGSI_INTERPOLATE_PERSPECTIVE,
  63                                                TRUE);
  64    }
  65
  66    return st->passthrough_fs;
  67 }
  68
  69
  70 /**
  71  * Update fragment program state/atom.  This involves translating the
  72  * Mesa fragment program into a gallium fragment program and binding it.
  73  */
  74 static void
  75 update_fp( struct st_context *st )
  76 {
  77    struct st_fragment_program *stfp;
  78    struct st_fp_variant_key key;
  79
  80    assert(st->ctx->FragmentProgram._Current);
  81    stfp = st_fragment_program(st->ctx->FragmentProgram._Current);
  82    assert(stfp->Base.Base.Target == GL_FRAGMENT_PROGRAM_ARB);
  83
  84    memset(&key, 0, sizeof(key));
  85    key.st = st;
  86
  87    /* _NEW_FRAG_CLAMP */
  88    key.clamp_color = st->clamp_frag_color_in_shader &&
  89                      st->ctx->Color._ClampFragmentColor;
  90
  91    /* Ignore sample qualifier while computing this flag. */
  92    key.persample_shading =
  93       _mesa_get_min_invocations_per_fragment(st->ctx, &stfp->Base, true) > 1;
  94
  95    st->fp_variant = st_get_fp_variant(st, stfp, &key);
  96
  97    st_reference_fragprog(st, &st->fp, stfp);
  98
  99    if (st->missing_textures) {
 100       /* use a pass-through frag shader that uses no textures */
 101       void *fs = get_passthrough_fs(st);
 102       cso_set_fragment_shader_handle(st->cso_context, fs);
 103    }
 104    else {
 105       cso_set_fragment_shader_handle(st->cso_context,
 106                                      st->fp_variant->driver_shader);
 107    }
 108 }
 109
 110
 111 const struct st_tracked_state st_update_fp = {
 112    "st_update_fp",                                      /* name */
 113    {                                                    /* dirty */
 114       _NEW_BUFFERS | _NEW_MULTISAMPLE,                  /* mesa */
 115       ST_NEW_FRAGMENT_PROGRAM                           /* st */
 116    },
 117    update_fp                                    /* update */
 118 };
 119
 120
 121
 122 /**
 123  * Update vertex program state/atom.  This involves translating the
 124  * Mesa vertex program into a gallium fragment program and binding it.
 125  */
 126 static void
 127 update_vp( struct st_context *st )
 128 {
 129    struct st_vertex_program *stvp;
 130    struct st_vp_variant_key key;
 131
 132    /* find active shader and params -- Should be covered by
 133     * ST_NEW_VERTEX_PROGRAM
 134     */
 135    assert(st->ctx->VertexProgram._Current);
 136    stvp = st_vertex_program(st->ctx->VertexProgram._Current);
 137    assert(stvp->Base.Base.Target == GL_VERTEX_PROGRAM_ARB);
 138
 139    memset(&key, 0, sizeof key);
 140    key.st = st;  /* variants are per-context */
 141
 142    /* When this is true, we will add an extra input to the vertex
 143     * shader translation (for edgeflags), an extra output with
 144     * edgeflag semantics, and extend the vertex shader to pass through
 145     * the input to the output.  We'll need to use similar logic to set
 146     * up the extra vertex_element input for edgeflags.
 147     */
 148    key.passthrough_edgeflags = st->vertdata_edgeflags;
 149
 150    key.clamp_color = st->clamp_vert_color_in_shader &&
 151                      st->ctx->Light._ClampVertexColor &&
 152                      (stvp->Base.Base.OutputsWritten &
 153                       (VARYING_SLOT_COL0 |
 154                        VARYING_SLOT_COL1 |
 155                        VARYING_SLOT_BFC0 |
 156                        VARYING_SLOT_BFC1));
 157
 158    st->vp_variant = st_get_vp_variant(st, stvp, &key);
 159
 160    st_reference_vertprog(st, &st->vp, stvp);
 161
 162    cso_set_vertex_shader_handle(st->cso_context,
 163                                 st->vp_variant->driver_shader);
 164
 165    st->vertex_result_to_slot = stvp->result_to_output;
 166 }
 167
 168
 169 const struct st_tracked_state st_update_vp = {
 170    "st_update_vp",                                      /* name */
 171    {                                                    /* dirty */
 172       0,                                                /* mesa */
 173       ST_NEW_VERTEX_PROGRAM                             /* st */
 174    },
 175    update_vp                                            /* update */
 176 };
 177
 178
 179
 180 static void
 181 update_gp( struct st_context *st )
 182 {
 183    struct st_geometry_program *stgp;
 184    struct st_gp_variant_key key;
 185
 186    if (!st->ctx->GeometryProgram._Current) {
 187       cso_set_geometry_shader_handle(st->cso_context, NULL);
 188       return;
 189    }
 190
 191    stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
 192    assert(stgp->Base.Base.Target == GL_GEOMETRY_PROGRAM_NV);
 193
 194    memset(&key, 0, sizeof(key));
 195    key.st = st;
 196
 197    st->gp_variant = st_get_gp_variant(st, stgp, &key);
 198
 199    st_reference_geomprog(st, &st->gp, stgp);
 200
 201    cso_set_geometry_shader_handle(st->cso_context,
 202                                   st->gp_variant->driver_shader);
 203 }
 204
 205 const struct st_tracked_state st_update_gp = {
 206    "st_update_gp",                      /* name */
 207    {                                    /* dirty */
 208       0,                                /* mesa */
 209       ST_NEW_GEOMETRY_PROGRAM           /* st */
 210    },
 211    update_gp                            /* update */
 212 };