src/mesa/state_tracker/st_atom_texture.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/samplerobj.h"
  38 #include "main/texobj.h"
  39 #include "program/prog_instruction.h"
  40
  41 #include "st_context.h"
  42 #include "st_atom.h"
  43 #include "st_texture.h"
  44 #include "st_format.h"
  45 #include "st_cb_texture.h"
  46 #include "pipe/p_context.h"
  47 #include "util/u_format.h"
  48 #include "util/u_inlines.h"
  49 #include "cso_cache/cso_context.h"
  50
  51
  52 /**
  53  * Combine depth texture mode with "swizzle" so that depth mode swizzling
  54  * takes place before texture swizzling, and return the resulting swizzle.
  55  * If the format is not a depth format, return "swizzle" unchanged.
  56  *
  57  * \param format     PIPE_FORMAT_*.
  58  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
  59  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA, GL_RED.
  60  */
  61 static GLuint
  62 apply_depthmode(enum pipe_format format, GLuint swizzle, GLenum depthmode)
  63 {
  64    const struct util_format_description *desc =
  65          util_format_description(format);
  66    unsigned char swiz[4];
  67    unsigned i;
  68
  69    if (desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS ||
  70        desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
  71       /* Not a depth format. */
  72       return swizzle;
  73    }
  74
  75    for (i = 0; i < 4; i++)
  76       swiz[i] = GET_SWZ(swizzle, i);
  77
  78    switch (depthmode) {
  79       case GL_LUMINANCE:
  80          /* Rewrite reads from W to ONE, and reads from XYZ to XXX. */
  81          for (i = 0; i < 4; i++)
  82             if (swiz[i] == SWIZZLE_W)
  83                swiz[i] = SWIZZLE_ONE;
  84             else if (swiz[i] < SWIZZLE_W)
  85                swiz[i] = SWIZZLE_X;
  86          break;
  87
  88       case GL_INTENSITY:
  89          /* Rewrite reads from XYZW to XXXX. */
  90          for (i = 0; i < 4; i++)
  91             if (swiz[i] <= SWIZZLE_W)
  92                swiz[i] = SWIZZLE_X;
  93          break;
  94
  95       case GL_ALPHA:
  96          /* Rewrite reads from W to X, and reads from XYZ to 000. */
  97          for (i = 0; i < 4; i++)
  98             if (swiz[i] == SWIZZLE_W)
  99                swiz[i] = SWIZZLE_X;
 100             else if (swiz[i] < SWIZZLE_W)
 101                swiz[i] = SWIZZLE_ZERO;
 102          break;
 103       case GL_RED:
 104          /* Rewrite reads W to 1, XYZ to X00 */
 105          for (i = 0; i < 4; i++)
 106             if (swiz[i] == SWIZZLE_W)
 107                swiz[i] = SWIZZLE_ONE;
 108             else if (swiz[i] == SWIZZLE_Y || swiz[i] == SWIZZLE_Z)
 109                swiz[i] = SWIZZLE_ZERO;
 110          break;
 111    }
 112
 113    return MAKE_SWIZZLE4(swiz[0], swiz[1], swiz[2], swiz[3]);
 114 }
 115
 116
 117 /**
 118  * Return TRUE if the swizzling described by "swizzle" and
 119  * "depthmode" (for depth textures only) is different from the swizzling
 120  * set in the given sampler view.
 121  *
 122  * \param sv         A sampler view.
 123  * \param swizzle    Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
 124  * \param depthmode  One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA.
 125  */
 126 static boolean
 127 check_sampler_swizzle(struct pipe_sampler_view *sv,
 128                       GLuint swizzle, GLenum depthmode)
 129 {
 130    swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode);
 131
 132    if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) ||
 133        (sv->swizzle_g != GET_SWZ(swizzle, 1)) ||
 134        (sv->swizzle_b != GET_SWZ(swizzle, 2)) ||
 135        (sv->swizzle_a != GET_SWZ(swizzle, 3)))
 136       return TRUE;
 137    return FALSE;
 138 }
 139
 140
 141 static struct pipe_sampler_view *
 142 st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
 143                                           struct st_texture_object *stObj,
 144                                           const struct gl_sampler_object *samp,
 145                                           enum pipe_format format)
 146 {
 147    struct pipe_sampler_view templ;
 148    GLuint swizzle = apply_depthmode(stObj->pt->format,
 149                                     stObj->base._Swizzle,
 150                                     stObj->base.DepthMode);
 151
 152    u_sampler_view_default_template(&templ,
 153                                    stObj->pt,
 154                                    format);
 155    templ.u.tex.first_level = stObj->base.BaseLevel;
 156
 157    if (swizzle != SWIZZLE_NOOP) {
 158       templ.swizzle_r = GET_SWZ(swizzle, 0);
 159       templ.swizzle_g = GET_SWZ(swizzle, 1);
 160       templ.swizzle_b = GET_SWZ(swizzle, 2);
 161       templ.swizzle_a = GET_SWZ(swizzle, 3);
 162    }
 163
 164    return pipe->create_sampler_view(pipe, stObj->pt, &templ);
 165 }
 166
 167
 168 static struct pipe_sampler_view *
 169 st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,
 170                                        struct pipe_context *pipe,
 171                                        const struct gl_sampler_object *samp,
 172                                        enum pipe_format format)
 173 {
 174    if (!stObj || !stObj->pt) {
 175       return NULL;
 176    }
 177
 178    if (!stObj->sampler_view) {
 179       stObj->sampler_view =
 180          st_create_texture_sampler_view_from_stobj(pipe, stObj, samp, format);
 181    }
 182
 183    return stObj->sampler_view;
 184 }
 185
 186
 187 static GLboolean
 188 update_single_texture(struct st_context *st,
 189                       struct pipe_sampler_view **sampler_view,
 190                       GLuint texUnit)
 191 {
 192    struct pipe_context *pipe = st->pipe;
 193    struct gl_context *ctx = st->ctx;
 194    const struct gl_sampler_object *samp;
 195    struct gl_texture_object *texObj;
 196    struct st_texture_object *stObj;
 197    enum pipe_format st_view_format;
 198    GLboolean retval;
 199
 200    samp = _mesa_get_samplerobj(ctx, texUnit);
 201
 202    texObj = ctx->Texture.Unit[texUnit]._Current;
 203
 204    if (!texObj) {
 205       texObj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 206       samp = &texObj->Sampler;
 207    }
 208    stObj = st_texture_object(texObj);
 209
 210    retval = st_finalize_texture(ctx, st->pipe, texObj);
 211    if (!retval) {
 212       /* out of mem */
 213       return GL_FALSE;
 214    }
 215
 216    /* Determine the format of the texture sampler view */
 217    st_view_format = stObj->pt->format;
 218    {
 219       const struct st_texture_image *firstImage =
 220          st_texture_image(stObj->base.Image[0][stObj->base.BaseLevel]);
 221       const gl_format texFormat = firstImage->base.TexFormat;
 222       enum pipe_format firstImageFormat =
 223          st_mesa_format_to_pipe_format(texFormat);
 224
 225       if ((samp->sRGBDecode == GL_SKIP_DECODE_EXT) &&
 226           (_mesa_get_format_color_encoding(texFormat) == GL_SRGB)) {
 227          /* Don't do sRGB->RGB conversion.  Interpret the texture data as
 228           * linear values.
 229           */
 230          const gl_format linearFormat =
 231             _mesa_get_srgb_format_linear(texFormat);
 232          firstImageFormat = st_mesa_format_to_pipe_format(linearFormat);
 233       }
 234
 235       if (firstImageFormat != stObj->pt->format)
 236          st_view_format = firstImageFormat;
 237    }
 238
 239    /* if sampler view has changed dereference it */
 240    if (stObj->sampler_view) {
 241       if (check_sampler_swizzle(stObj->sampler_view,
 242                                 stObj->base._Swizzle,
 243                                 stObj->base.DepthMode) ||
 244           (st_view_format != stObj->sampler_view->format) ||
 245           stObj->base.BaseLevel != stObj->sampler_view->u.tex.first_level) {
 246          pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 247       }
 248    }
 249
 250    *sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe,
 251                                                           samp,
 252                                                           st_view_format);
 253    return GL_TRUE;
 254 }
 255
 256
 257
 258 static void
 259 update_textures(struct st_context *st,
 260                 unsigned shader_stage,
 261                 const struct gl_program *prog,
 262                 unsigned max_units,
 263                 struct pipe_sampler_view **sampler_views,
 264                 unsigned *num_textures)
 265 {
 266    const GLuint old_max = *num_textures;
 267    GLbitfield samplers_used = prog->SamplersUsed;
 268    GLuint unit, new_count;
 269
 270    if (samplers_used == 0x0 && old_max == 0)
 271       return;
 272
 273    *num_textures = 0;
 274
 275    /* loop over sampler units (aka tex image units) */
 276    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 277       struct pipe_sampler_view *sampler_view = NULL;
 278
 279       if (samplers_used & 1) {
 280          const GLuint texUnit = prog->SamplerUnits[unit];
 281          GLboolean retval;
 282
 283          retval = update_single_texture(st, &sampler_view, texUnit);
 284          if (retval == GL_FALSE)
 285             continue;
 286
 287          *num_textures = unit + 1;
 288       }
 289       else if (samplers_used == 0 && unit >= old_max) {
 290          /* if we've reset all the old views and we have no more new ones */
 291          break;
 292       }
 293
 294       pipe_sampler_view_reference(&(sampler_views[unit]), sampler_view);
 295    }
 296
 297    /* Ex: if old_max = 3 and *num_textures = 1, we need to pass an
 298     * array of views={X, NULL, NULL} to unref the old texture views
 299     * at positions [1] and [2].
 300     */
 301    new_count = MAX2(*num_textures, old_max);
 302    assert(new_count <= max_units);
 303
 304    cso_set_sampler_views(st->cso_context,
 305                          shader_stage,
 306                          new_count,
 307                          sampler_views);
 308 }
 309
 310
 311
 312 static void
 313 update_vertex_textures(struct st_context *st)
 314 {
 315    const struct gl_context *ctx = st->ctx;
 316
 317    if (ctx->Const.MaxVertexTextureImageUnits > 0) {
 318       update_textures(st,
 319                       PIPE_SHADER_VERTEX,
 320                       &ctx->VertexProgram._Current->Base,
 321                       ctx->Const.MaxVertexTextureImageUnits,
 322                       st->state.sampler_views[PIPE_SHADER_VERTEX],
 323                       &st->state.num_sampler_views[PIPE_SHADER_VERTEX]);
 324    }
 325 }
 326
 327
 328 static void
 329 update_fragment_textures(struct st_context *st)
 330 {
 331    const struct gl_context *ctx = st->ctx;
 332
 333    update_textures(st,
 334                    PIPE_SHADER_FRAGMENT,
 335                    &ctx->FragmentProgram._Current->Base,
 336                    ctx->Const.MaxTextureImageUnits,
 337                    st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 338                    &st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 339 }
 340
 341
 342 static void
 343 update_geometry_textures(struct st_context *st)
 344 {
 345    const struct gl_context *ctx = st->ctx;
 346
 347    if (ctx->GeometryProgram._Current) {
 348       update_textures(st,
 349                       PIPE_SHADER_GEOMETRY,
 350                       &ctx->GeometryProgram._Current->Base,
 351                       ctx->Const.MaxTextureImageUnits,
 352                       st->state.sampler_views[PIPE_SHADER_GEOMETRY],
 353                       &st->state.num_sampler_views[PIPE_SHADER_GEOMETRY]);
 354    }
 355 }
 356
 357
 358 const struct st_tracked_state st_update_fragment_texture = {
 359    "st_update_texture",                                 /* name */
 360    {                                                    /* dirty */
 361       _NEW_TEXTURE,                                     /* mesa */
 362       ST_NEW_FRAGMENT_PROGRAM,                          /* st */
 363    },
 364    update_fragment_textures                             /* update */
 365 };
 366
 367
 368 const struct st_tracked_state st_update_vertex_texture = {
 369    "st_update_vertex_texture",                          /* name */
 370    {                                                    /* dirty */
 371       _NEW_TEXTURE,                                     /* mesa */
 372       ST_NEW_VERTEX_PROGRAM,                            /* st */
 373    },
 374    update_vertex_textures                               /* update */
 375 };
 376
 377
 378 const struct st_tracked_state st_update_geometry_texture = {
 379    "st_update_geometry_texture",                        /* name */
 380    {                                                    /* dirty */
 381       _NEW_TEXTURE,                                     /* mesa */
 382       ST_NEW_GEOMETRY_PROGRAM,                          /* st */
 383    },
 384    update_geometry_textures                             /* update */
 385 };
 386
 387
 388
 389 static void
 390 finalize_textures(struct st_context *st)
 391 {
 392    struct gl_context *ctx = st->ctx;
 393    struct gl_fragment_program *fprog = ctx->FragmentProgram._Current;
 394    const GLboolean prev_missing_textures = st->missing_textures;
 395    GLuint su;
 396
 397    st->missing_textures = GL_FALSE;
 398
 399    for (su = 0; su < ctx->Const.MaxTextureCoordUnits; su++) {
 400       if (fprog->Base.SamplersUsed & (1 << su)) {
 401          const GLuint texUnit = fprog->Base.SamplerUnits[su];
 402          struct gl_texture_object *texObj
 403             = ctx->Texture.Unit[texUnit]._Current;
 404
 405          if (texObj) {
 406             GLboolean retval;
 407
 408             retval = st_finalize_texture(ctx, st->pipe, texObj);
 409             if (!retval) {
 410                /* out of mem */
 411                st->missing_textures = GL_TRUE;
 412                continue;
 413             }
 414          }
 415       }
 416    }
 417
 418    if (prev_missing_textures != st->missing_textures)
 419       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 420 }
 421
 422
 423 const struct st_tracked_state st_finalize_textures = {
 424    "st_finalize_textures",              /* name */
 425    {                                    /* dirty */
 426       _NEW_TEXTURE,                     /* mesa */
 427       0,                                /* st */
 428    },
 429    finalize_textures                    /* update */
 430 };