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
 156    if (stObj->pt->target == PIPE_BUFFER) {
 157       unsigned base, size;
 158       unsigned f, n;
 159       const struct util_format_description *desc
 160          = util_format_description(templ.format);
 161
 162       base = stObj->base.BufferOffset;
 163       if (base >= stObj->pt->width0)
 164          return NULL;
 165       size = MIN2(stObj->pt->width0 - base, (unsigned)stObj->base.BufferSize);
 166
 167       f = ((base * 8) / desc->block.bits) * desc->block.width;
 168       n = ((size * 8) / desc->block.bits) * desc->block.width;
 169       if (!n)
 170          return NULL;
 171       templ.u.buf.first_element = f;
 172       templ.u.buf.last_element  = f + (n - 1);
 173    } else {
 174       templ.u.tex.first_level = stObj->base.BaseLevel;
 175    }
 176
 177    if (swizzle != SWIZZLE_NOOP) {
 178       templ.swizzle_r = GET_SWZ(swizzle, 0);
 179       templ.swizzle_g = GET_SWZ(swizzle, 1);
 180       templ.swizzle_b = GET_SWZ(swizzle, 2);
 181       templ.swizzle_a = GET_SWZ(swizzle, 3);
 182    }
 183
 184    return pipe->create_sampler_view(pipe, stObj->pt, &templ);
 185 }
 186
 187
 188 static struct pipe_sampler_view *
 189 st_get_texture_sampler_view_from_stobj(struct st_texture_object *stObj,
 190                                        struct pipe_context *pipe,
 191                                        const struct gl_sampler_object *samp,
 192                                        enum pipe_format format)
 193 {
 194    if (!stObj || !stObj->pt) {
 195       return NULL;
 196    }
 197
 198    if (!stObj->sampler_view) {
 199       stObj->sampler_view =
 200          st_create_texture_sampler_view_from_stobj(pipe, stObj, samp, format);
 201    }
 202
 203    return stObj->sampler_view;
 204 }
 205
 206
 207 static GLboolean
 208 update_single_texture(struct st_context *st,
 209                       struct pipe_sampler_view **sampler_view,
 210                       GLuint texUnit)
 211 {
 212    struct pipe_context *pipe = st->pipe;
 213    struct gl_context *ctx = st->ctx;
 214    const struct gl_sampler_object *samp;
 215    struct gl_texture_object *texObj;
 216    struct st_texture_object *stObj;
 217    enum pipe_format view_format;
 218    GLboolean retval;
 219
 220    samp = _mesa_get_samplerobj(ctx, texUnit);
 221
 222    texObj = ctx->Texture.Unit[texUnit]._Current;
 223
 224    if (!texObj) {
 225       texObj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 226       samp = &texObj->Sampler;
 227    }
 228    stObj = st_texture_object(texObj);
 229
 230    retval = st_finalize_texture(ctx, st->pipe, texObj);
 231    if (!retval) {
 232       /* out of mem */
 233       return GL_FALSE;
 234    }
 235
 236    /* Determine the format of the texture sampler view */
 237    if (texObj->Target == GL_TEXTURE_BUFFER) {
 238       view_format =
 239          st_mesa_format_to_pipe_format(stObj->base._BufferObjectFormat);
 240    }
 241    else {
 242       view_format =
 243          stObj->surface_based ? stObj->surface_format : stObj->pt->format;
 244
 245       /* If sRGB decoding is off, use the linear format */
 246       if (samp->sRGBDecode == GL_SKIP_DECODE_EXT) {
 247          view_format = util_format_linear(view_format);
 248       }
 249    }
 250
 251    /* if sampler view has changed dereference it */
 252    if (stObj->sampler_view) {
 253       if (check_sampler_swizzle(stObj->sampler_view,
 254                                 stObj->base._Swizzle,
 255                                 stObj->base.DepthMode) ||
 256           (view_format != stObj->sampler_view->format) ||
 257           stObj->base.BaseLevel != stObj->sampler_view->u.tex.first_level) {
 258          pipe_sampler_view_reference(&stObj->sampler_view, NULL);
 259       }
 260    }
 261
 262    *sampler_view = st_get_texture_sampler_view_from_stobj(stObj, pipe,
 263                                                           samp,
 264                                                           view_format);
 265    return GL_TRUE;
 266 }
 267
 268
 269
 270 static void
 271 update_textures(struct st_context *st,
 272                 unsigned shader_stage,
 273                 const struct gl_program *prog,
 274                 unsigned max_units,
 275                 struct pipe_sampler_view **sampler_views,
 276                 unsigned *num_textures)
 277 {
 278    const GLuint old_max = *num_textures;
 279    GLbitfield samplers_used = prog->SamplersUsed;
 280    GLuint unit, new_count;
 281
 282    if (samplers_used == 0x0 && old_max == 0)
 283       return;
 284
 285    *num_textures = 0;
 286
 287    /* loop over sampler units (aka tex image units) */
 288    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 289       struct pipe_sampler_view *sampler_view = NULL;
 290
 291       if (samplers_used & 1) {
 292          const GLuint texUnit = prog->SamplerUnits[unit];
 293          GLboolean retval;
 294
 295          retval = update_single_texture(st, &sampler_view, texUnit);
 296          if (retval == GL_FALSE)
 297             continue;
 298
 299          *num_textures = unit + 1;
 300       }
 301       else if (samplers_used == 0 && unit >= old_max) {
 302          /* if we've reset all the old views and we have no more new ones */
 303          break;
 304       }
 305
 306       pipe_sampler_view_reference(&(sampler_views[unit]), sampler_view);
 307    }
 308
 309    /* Ex: if old_max = 3 and *num_textures = 1, we need to pass an
 310     * array of views={X, NULL, NULL} to unref the old texture views
 311     * at positions [1] and [2].
 312     */
 313    new_count = MAX2(*num_textures, old_max);
 314    assert(new_count <= max_units);
 315
 316    cso_set_sampler_views(st->cso_context,
 317                          shader_stage,
 318                          new_count,
 319                          sampler_views);
 320 }
 321
 322
 323
 324 static void
 325 update_vertex_textures(struct st_context *st)
 326 {
 327    const struct gl_context *ctx = st->ctx;
 328
 329    if (ctx->Const.VertexProgram.MaxTextureImageUnits > 0) {
 330       update_textures(st,
 331                       PIPE_SHADER_VERTEX,
 332                       &ctx->VertexProgram._Current->Base,
 333                       ctx->Const.VertexProgram.MaxTextureImageUnits,
 334                       st->state.sampler_views[PIPE_SHADER_VERTEX],
 335                       &st->state.num_sampler_views[PIPE_SHADER_VERTEX]);
 336    }
 337 }
 338
 339
 340 static void
 341 update_fragment_textures(struct st_context *st)
 342 {
 343    const struct gl_context *ctx = st->ctx;
 344
 345    update_textures(st,
 346                    PIPE_SHADER_FRAGMENT,
 347                    &ctx->FragmentProgram._Current->Base,
 348                    ctx->Const.FragmentProgram.MaxTextureImageUnits,
 349                    st->state.sampler_views[PIPE_SHADER_FRAGMENT],
 350                    &st->state.num_sampler_views[PIPE_SHADER_FRAGMENT]);
 351 }
 352
 353
 354 static void
 355 update_geometry_textures(struct st_context *st)
 356 {
 357    const struct gl_context *ctx = st->ctx;
 358
 359    if (ctx->GeometryProgram._Current) {
 360       update_textures(st,
 361                       PIPE_SHADER_GEOMETRY,
 362                       &ctx->GeometryProgram._Current->Base,
 363                       ctx->Const.FragmentProgram.MaxTextureImageUnits,
 364                       st->state.sampler_views[PIPE_SHADER_GEOMETRY],
 365                       &st->state.num_sampler_views[PIPE_SHADER_GEOMETRY]);
 366    }
 367 }
 368
 369
 370 const struct st_tracked_state st_update_fragment_texture = {
 371    "st_update_texture",                                 /* name */
 372    {                                                    /* dirty */
 373       _NEW_TEXTURE,                                     /* mesa */
 374       ST_NEW_FRAGMENT_PROGRAM,                          /* st */
 375    },
 376    update_fragment_textures                             /* update */
 377 };
 378
 379
 380 const struct st_tracked_state st_update_vertex_texture = {
 381    "st_update_vertex_texture",                          /* name */
 382    {                                                    /* dirty */
 383       _NEW_TEXTURE,                                     /* mesa */
 384       ST_NEW_VERTEX_PROGRAM,                            /* st */
 385    },
 386    update_vertex_textures                               /* update */
 387 };
 388
 389
 390 const struct st_tracked_state st_update_geometry_texture = {
 391    "st_update_geometry_texture",                        /* name */
 392    {                                                    /* dirty */
 393       _NEW_TEXTURE,                                     /* mesa */
 394       ST_NEW_GEOMETRY_PROGRAM,                          /* st */
 395    },
 396    update_geometry_textures                             /* update */
 397 };
 398
 399
 400
 401 static void
 402 finalize_textures(struct st_context *st)
 403 {
 404    struct gl_context *ctx = st->ctx;
 405    struct gl_fragment_program *fprog = ctx->FragmentProgram._Current;
 406    const GLboolean prev_missing_textures = st->missing_textures;
 407    GLuint su;
 408
 409    st->missing_textures = GL_FALSE;
 410
 411    for (su = 0; su < ctx->Const.MaxTextureCoordUnits; su++) {
 412       if (fprog->Base.SamplersUsed & (1 << su)) {
 413          const GLuint texUnit = fprog->Base.SamplerUnits[su];
 414          struct gl_texture_object *texObj
 415             = ctx->Texture.Unit[texUnit]._Current;
 416
 417          if (texObj) {
 418             GLboolean retval;
 419
 420             retval = st_finalize_texture(ctx, st->pipe, texObj);
 421             if (!retval) {
 422                /* out of mem */
 423                st->missing_textures = GL_TRUE;
 424                continue;
 425             }
 426          }
 427       }
 428    }
 429
 430    if (prev_missing_textures != st->missing_textures)
 431       st->dirty.st |= ST_NEW_FRAGMENT_PROGRAM;
 432 }
 433
 434
 435 const struct st_tracked_state st_finalize_textures = {
 436    "st_finalize_textures",              /* name */
 437    {                                    /* dirty */
 438       _NEW_TEXTURE,                     /* mesa */
 439       0,                                /* st */
 440    },
 441    finalize_textures                    /* update */
 442 };