src/gallium/drivers/svga/svga_shader.c

   1 /**********************************************************
   2  * Copyright 2008-2012 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_bitmask.h"
  27 #include "util/u_memory.h"
  28 #include "util/u_format.h"
  29 #include "svga_context.h"
  30 #include "svga_cmd.h"
  31 #include "svga_format.h"
  32 #include "svga_shader.h"
  33 #include "svga_resource_texture.h"
  34
  35
  36 /**
  37  * This bit isn't really used anywhere.  It only serves to help
  38  * generate a unique "signature" for the vertex shader output bitmask.
  39  * Shader input/output signatures are used to resolve shader linking
  40  * issues.
  41  */
  42 #define FOG_GENERIC_BIT (((uint64_t) 1) << 63)
  43
  44
  45 /**
  46  * Use the shader info to generate a bitmask indicating which generic
  47  * inputs are used by the shader.  A set bit indicates that GENERIC[i]
  48  * is used.
  49  */
  50 uint64_t
  51 svga_get_generic_inputs_mask(const struct tgsi_shader_info *info)
  52 {
  53    unsigned i;
  54    uint64_t mask = 0x0;
  55
  56    for (i = 0; i < info->num_inputs; i++) {
  57       if (info->input_semantic_name[i] == TGSI_SEMANTIC_GENERIC) {
  58          unsigned j = info->input_semantic_index[i];
  59          assert(j < sizeof(mask) * 8);
  60          mask |= ((uint64_t) 1) << j;
  61       }
  62    }
  63
  64    return mask;
  65 }
  66
  67
  68 /**
  69  * Scan shader info to return a bitmask of written outputs.
  70  */
  71 uint64_t
  72 svga_get_generic_outputs_mask(const struct tgsi_shader_info *info)
  73 {
  74    unsigned i;
  75    uint64_t mask = 0x0;
  76
  77    for (i = 0; i < info->num_outputs; i++) {
  78       switch (info->output_semantic_name[i]) {
  79       case TGSI_SEMANTIC_GENERIC:
  80          {
  81             unsigned j = info->output_semantic_index[i];
  82             assert(j < sizeof(mask) * 8);
  83             mask |= ((uint64_t) 1) << j;
  84          }
  85          break;
  86       case TGSI_SEMANTIC_FOG:
  87          mask |= FOG_GENERIC_BIT;
  88          break;
  89       }
  90    }
  91
  92    return mask;
  93 }
  94
  95
  96
  97 /**
  98  * Given a mask of used generic variables (as returned by the above functions)
  99  * fill in a table which maps those indexes to small integers.
 100  * This table is used by the remap_generic_index() function in
 101  * svga_tgsi_decl_sm30.c
 102  * Example: if generics_mask = binary(1010) it means that GENERIC[1] and
 103  * GENERIC[3] are used.  The remap_table will contain:
 104  *   table[1] = 0;
 105  *   table[3] = 1;
 106  * The remaining table entries will be filled in with the next unused
 107  * generic index (in this example, 2).
 108  */
 109 void
 110 svga_remap_generics(uint64_t generics_mask,
 111                     int8_t remap_table[MAX_GENERIC_VARYING])
 112 {
 113    /* Note texcoord[0] is reserved so start at 1 */
 114    unsigned count = 1, i;
 115
 116    for (i = 0; i < MAX_GENERIC_VARYING; i++) {
 117       remap_table[i] = -1;
 118    }
 119
 120    /* for each bit set in generic_mask */
 121    while (generics_mask) {
 122       unsigned index = ffsll(generics_mask) - 1;
 123       remap_table[index] = count++;
 124       generics_mask &= ~((uint64_t) 1 << index);
 125    }
 126 }
 127
 128
 129 /**
 130  * Use the generic remap table to map a TGSI generic varying variable
 131  * index to a small integer.  If the remapping table doesn't have a
 132  * valid value for the given index (the table entry is -1) it means
 133  * the fragment shader doesn't use that VS output.  Just allocate
 134  * the next free value in that case.  Alternately, we could cull
 135  * VS instructions that write to register, or replace the register
 136  * with a dummy temp register.
 137  * XXX TODO: we should do one of the later as it would save precious
 138  * texcoord registers.
 139  */
 140 int
 141 svga_remap_generic_index(int8_t remap_table[MAX_GENERIC_VARYING],
 142                          int generic_index)
 143 {
 144    assert(generic_index < MAX_GENERIC_VARYING);
 145
 146    if (generic_index >= MAX_GENERIC_VARYING) {
 147       /* just don't return a random/garbage value */
 148       generic_index = MAX_GENERIC_VARYING - 1;
 149    }
 150
 151    if (remap_table[generic_index] == -1) {
 152       /* This is a VS output that has no matching PS input.  Find a
 153        * free index.
 154        */
 155       int i, max = 0;
 156       for (i = 0; i < MAX_GENERIC_VARYING; i++) {
 157          max = MAX2(max, remap_table[i]);
 158       }
 159       remap_table[generic_index] = max + 1;
 160    }
 161
 162    return remap_table[generic_index];
 163 }
 164
 165 static const enum pipe_swizzle copy_alpha[PIPE_SWIZZLE_MAX] = {
 166    PIPE_SWIZZLE_X,
 167    PIPE_SWIZZLE_Y,
 168    PIPE_SWIZZLE_Z,
 169    PIPE_SWIZZLE_W,
 170    PIPE_SWIZZLE_0,
 171    PIPE_SWIZZLE_1,
 172    PIPE_SWIZZLE_NONE
 173 };
 174
 175 static const enum pipe_swizzle set_alpha[PIPE_SWIZZLE_MAX] = {
 176    PIPE_SWIZZLE_X,
 177    PIPE_SWIZZLE_Y,
 178    PIPE_SWIZZLE_Z,
 179    PIPE_SWIZZLE_1,
 180    PIPE_SWIZZLE_0,
 181    PIPE_SWIZZLE_1,
 182    PIPE_SWIZZLE_NONE
 183 };
 184
 185 /**
 186  * Initialize the shader-neutral fields of svga_compile_key from context
 187  * state.  This is basically the texture-related state.
 188  */
 189 void
 190 svga_init_shader_key_common(const struct svga_context *svga,
 191                             enum pipe_shader_type shader,
 192                             struct svga_compile_key *key)
 193 {
 194    unsigned i, idx = 0;
 195
 196    assert(shader < ARRAY_SIZE(svga->curr.num_sampler_views));
 197
 198    /* In case the number of samplers and sampler_views doesn't match,
 199     * loop over the lower of the two counts.
 200     */
 201    key->num_textures = MAX2(svga->curr.num_sampler_views[shader],
 202                             svga->curr.num_samplers[shader]);
 203
 204    for (i = 0; i < key->num_textures; i++) {
 205       struct pipe_sampler_view *view = svga->curr.sampler_views[shader][i];
 206       const struct svga_sampler_state *sampler = svga->curr.sampler[shader][i];
 207       if (view) {
 208          assert(view->texture);
 209          assert(view->texture->target < (1 << 4)); /* texture_target:4 */
 210
 211          /* 1D/2D array textures with one slice are treated as non-arrays
 212           * by the SVGA3D device.  Convert the texture type here so that
 213           * we emit the right TEX/SAMPLE instruction in the shader.
 214           */
 215          if (view->texture->target == PIPE_TEXTURE_1D_ARRAY ||
 216              view->texture->target == PIPE_TEXTURE_2D_ARRAY) {
 217             if (view->texture->array_size == 1) {
 218                key->tex[i].is_array = 0;
 219             }
 220             else {
 221                assert(view->texture->array_size > 1);
 222                key->tex[i].is_array = 1;
 223             }
 224          }
 225
 226          /* If we have a non-alpha view into an svga3d surface with an
 227           * alpha channel, then explicitly set the alpha channel to 1
 228           * when sampling. Note that we need to check the
 229           * actual device format to cover also imported surface cases.
 230           */
 231          const enum pipe_swizzle *swizzle_tab =
 232             (view->texture->target != PIPE_BUFFER &&
 233              !util_format_has_alpha(view->format) &&
 234              svga_texture_device_format_has_alpha(view->texture)) ?
 235             set_alpha : copy_alpha;
 236
 237          if (view->texture->format == PIPE_FORMAT_DXT1_RGB ||
 238              view->texture->format == PIPE_FORMAT_DXT1_SRGB)
 239             swizzle_tab = set_alpha;
 240
 241          key->tex[i].swizzle_r = swizzle_tab[view->swizzle_r];
 242          key->tex[i].swizzle_g = swizzle_tab[view->swizzle_g];
 243          key->tex[i].swizzle_b = swizzle_tab[view->swizzle_b];
 244          key->tex[i].swizzle_a = swizzle_tab[view->swizzle_a];
 245       }
 246
 247       if (sampler) {
 248          if (!sampler->normalized_coords) {
 249             assert(idx < (1 << 5));  /* width_height_idx:5 bitfield */
 250             key->tex[i].width_height_idx = idx++;
 251             key->tex[i].unnormalized = TRUE;
 252             ++key->num_unnormalized_coords;
 253
 254             if (sampler->magfilter == SVGA3D_TEX_FILTER_NEAREST ||
 255                 sampler->minfilter == SVGA3D_TEX_FILTER_NEAREST) {
 256                 key->tex[i].texel_bias = TRUE;
 257             }
 258          }
 259       }
 260    }
 261 }
 262
 263
 264 /** Search for a compiled shader variant with the same compile key */
 265 struct svga_shader_variant *
 266 svga_search_shader_key(const struct svga_shader *shader,
 267                        const struct svga_compile_key *key)
 268 {
 269    struct svga_shader_variant *variant = shader->variants;
 270
 271    assert(key);
 272
 273    for ( ; variant; variant = variant->next) {
 274       if (svga_compile_keys_equal(key, &variant->key))
 275          return variant;
 276    }
 277    return NULL;
 278 }
 279
 280 /** Search for a shader with the same token key */
 281 struct svga_shader *
 282 svga_search_shader_token_key(struct svga_shader *pshader,
 283                              const struct svga_token_key *key)
 284 {
 285    struct svga_shader *shader = pshader;
 286
 287    assert(key);
 288
 289    for ( ; shader; shader = shader->next) {
 290       if (memcmp(key, &shader->token_key, sizeof(struct svga_token_key)) == 0)
 291          return shader;
 292    }
 293    return NULL;
 294 }
 295
 296 /**
 297  * Helper function to define a gb shader for non-vgpu10 device
 298  */
 299 static enum pipe_error
 300 define_gb_shader_vgpu9(struct svga_context *svga,
 301                        SVGA3dShaderType type,
 302                        struct svga_shader_variant *variant,
 303                        unsigned codeLen)
 304 {
 305    struct svga_winsys_screen *sws = svga_screen(svga->pipe.screen)->sws;
 306    enum pipe_error ret;
 307
 308    /**
 309     * Create gb memory for the shader and upload the shader code.
 310     * Kernel module will allocate an id for the shader and issue
 311     * the DefineGBShader command.
 312     */
 313    variant->gb_shader = sws->shader_create(sws, type,
 314                                            variant->tokens, codeLen);
 315
 316    if (!variant->gb_shader)
 317       return PIPE_ERROR_OUT_OF_MEMORY;
 318
 319    ret = SVGA3D_BindGBShader(svga->swc, variant->gb_shader);
 320
 321    return ret;
 322 }
 323
 324 /**
 325  * Helper function to define a gb shader for vgpu10 device
 326  */
 327 static enum pipe_error
 328 define_gb_shader_vgpu10(struct svga_context *svga,
 329                         SVGA3dShaderType type,
 330                         struct svga_shader_variant *variant,
 331                         unsigned codeLen)
 332 {
 333    struct svga_winsys_context *swc = svga->swc;
 334    enum pipe_error ret;
 335
 336    /**
 337     * Shaders in VGPU10 enabled device reside in the device COTable.
 338     * SVGA driver will allocate an integer ID for the shader and
 339     * issue DXDefineShader and DXBindShader commands.
 340     */
 341    variant->id = util_bitmask_add(svga->shader_id_bm);
 342    if (variant->id == UTIL_BITMASK_INVALID_INDEX) {
 343       return PIPE_ERROR_OUT_OF_MEMORY;
 344    }
 345
 346    /* Create gb memory for the shader and upload the shader code */
 347    variant->gb_shader = swc->shader_create(swc,
 348                                            variant->id, type,
 349                                            variant->tokens, codeLen);
 350
 351    if (!variant->gb_shader) {
 352       /* Free the shader ID */
 353       assert(variant->id != UTIL_BITMASK_INVALID_INDEX);
 354       goto fail_no_allocation;
 355    }
 356
 357    /**
 358     * Since we don't want to do any flush within state emission to avoid
 359     * partial state in a command buffer, it's important to make sure that
 360     * there is enough room to send both the DXDefineShader & DXBindShader
 361     * commands in the same command buffer. So let's send both
 362     * commands in one command reservation. If it fails, we'll undo
 363     * the shader creation and return an error.
 364     */
 365    ret = SVGA3D_vgpu10_DefineAndBindShader(swc, variant->gb_shader,
 366                                            variant->id, type, codeLen);
 367
 368    if (ret != PIPE_OK)
 369       goto fail;
 370
 371    return PIPE_OK;
 372
 373 fail:
 374    swc->shader_destroy(swc, variant->gb_shader);
 375    variant->gb_shader = NULL;
 376
 377 fail_no_allocation:
 378    util_bitmask_clear(svga->shader_id_bm, variant->id);
 379    variant->id = UTIL_BITMASK_INVALID_INDEX;
 380
 381    return PIPE_ERROR_OUT_OF_MEMORY;
 382 }
 383
 384 /**
 385  * Issue the SVGA3D commands to define a new shader.
 386  * \param variant  contains the shader tokens, etc.  The result->id field will
 387  *                 be set here.
 388  */
 389 enum pipe_error
 390 svga_define_shader(struct svga_context *svga,
 391                    SVGA3dShaderType type,
 392                    struct svga_shader_variant *variant)
 393 {
 394    unsigned codeLen = variant->nr_tokens * sizeof(variant->tokens[0]);
 395    enum pipe_error ret;
 396
 397    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_DEFINESHADER);
 398
 399    variant->id = UTIL_BITMASK_INVALID_INDEX;
 400
 401    if (svga_have_gb_objects(svga)) {
 402       if (svga_have_vgpu10(svga))
 403          ret = define_gb_shader_vgpu10(svga, type, variant, codeLen);
 404       else
 405          ret = define_gb_shader_vgpu9(svga, type, variant, codeLen);
 406    }
 407    else {
 408       /* Allocate an integer ID for the shader */
 409       variant->id = util_bitmask_add(svga->shader_id_bm);
 410       if (variant->id == UTIL_BITMASK_INVALID_INDEX) {
 411          ret = PIPE_ERROR_OUT_OF_MEMORY;
 412          goto done;
 413       }
 414
 415       /* Issue SVGA3D device command to define the shader */
 416       ret = SVGA3D_DefineShader(svga->swc,
 417                                 variant->id,
 418                                 type,
 419                                 variant->tokens,
 420                                 codeLen);
 421       if (ret != PIPE_OK) {
 422          /* free the ID */
 423          assert(variant->id != UTIL_BITMASK_INVALID_INDEX);
 424          util_bitmask_clear(svga->shader_id_bm, variant->id);
 425          variant->id = UTIL_BITMASK_INVALID_INDEX;
 426       }
 427    }
 428
 429 done:
 430    SVGA_STATS_TIME_POP(svga_sws(svga));
 431    return ret;
 432 }
 433
 434
 435 /**
 436  * Issue the SVGA3D commands to set/bind a shader.
 437  * \param result  the shader to bind.
 438  */
 439 enum pipe_error
 440 svga_set_shader(struct svga_context *svga,
 441                 SVGA3dShaderType type,
 442                 struct svga_shader_variant *variant)
 443 {
 444    enum pipe_error ret;
 445    unsigned id = variant ? variant->id : SVGA3D_INVALID_ID;
 446
 447    assert(type == SVGA3D_SHADERTYPE_VS ||
 448           type == SVGA3D_SHADERTYPE_GS ||
 449           type == SVGA3D_SHADERTYPE_PS);
 450
 451    if (svga_have_gb_objects(svga)) {
 452       struct svga_winsys_gb_shader *gbshader =
 453          variant ? variant->gb_shader : NULL;
 454
 455       if (svga_have_vgpu10(svga))
 456          ret = SVGA3D_vgpu10_SetShader(svga->swc, type, gbshader, id);
 457       else
 458          ret = SVGA3D_SetGBShader(svga->swc, type, gbshader);
 459    }
 460    else {
 461       ret = SVGA3D_SetShader(svga->swc, type, id);
 462    }
 463
 464    return ret;
 465 }
 466
 467
 468 struct svga_shader_variant *
 469 svga_new_shader_variant(struct svga_context *svga)
 470 {
 471    svga->hud.num_shaders++;
 472    return CALLOC_STRUCT(svga_shader_variant);
 473 }
 474
 475
 476 enum pipe_error
 477 svga_destroy_shader_variant(struct svga_context *svga,
 478                             SVGA3dShaderType type,
 479                             struct svga_shader_variant *variant)
 480 {
 481    enum pipe_error ret = PIPE_OK;
 482
 483    if (svga_have_gb_objects(svga) && variant->gb_shader) {
 484       if (svga_have_vgpu10(svga)) {
 485          struct svga_winsys_context *swc = svga->swc;
 486          swc->shader_destroy(swc, variant->gb_shader);
 487          ret = SVGA3D_vgpu10_DestroyShader(svga->swc, variant->id);
 488          if (ret != PIPE_OK) {
 489             /* flush and try again */
 490             svga_context_flush(svga, NULL);
 491             ret = SVGA3D_vgpu10_DestroyShader(svga->swc, variant->id);
 492          }
 493          util_bitmask_clear(svga->shader_id_bm, variant->id);
 494       }
 495       else {
 496          struct svga_winsys_screen *sws = svga_screen(svga->pipe.screen)->sws;
 497          sws->shader_destroy(sws, variant->gb_shader);
 498       }
 499       variant->gb_shader = NULL;
 500    }
 501    else {
 502       if (variant->id != UTIL_BITMASK_INVALID_INDEX) {
 503          ret = SVGA3D_DestroyShader(svga->swc, variant->id, type);
 504          if (ret != PIPE_OK) {
 505             /* flush and try again */
 506             svga_context_flush(svga, NULL);
 507             ret = SVGA3D_DestroyShader(svga->swc, variant->id, type);
 508             assert(ret == PIPE_OK);
 509          }
 510          util_bitmask_clear(svga->shader_id_bm, variant->id);
 511       }
 512    }
 513
 514    FREE((unsigned *)variant->tokens);
 515    FREE(variant);
 516
 517    svga->hud.num_shaders--;
 518
 519    return ret;
 520 }
 521
 522 /*
 523  * Rebind shaders.
 524  * Called at the beginning of every new command buffer to ensure that
 525  * shaders are properly paged-in. Instead of sending the SetShader
 526  * command, this function sends a private allocation command to
 527  * page in a shader. This avoids emitting redundant state to the device
 528  * just to page in a resource.
 529  */
 530 enum pipe_error
 531 svga_rebind_shaders(struct svga_context *svga)
 532 {
 533    struct svga_winsys_context *swc = svga->swc;
 534    struct svga_hw_draw_state *hw = &svga->state.hw_draw;
 535    enum pipe_error ret;
 536
 537    assert(svga_have_vgpu10(svga));
 538
 539    /**
 540     * If the underlying winsys layer does not need resource rebinding,
 541     * just clear the rebind flags and return.
 542     */
 543    if (swc->resource_rebind == NULL) {
 544       svga->rebind.flags.vs = 0;
 545       svga->rebind.flags.gs = 0;
 546       svga->rebind.flags.fs = 0;
 547
 548       return PIPE_OK;
 549    }
 550
 551    if (svga->rebind.flags.vs && hw->vs && hw->vs->gb_shader) {
 552       ret = swc->resource_rebind(swc, NULL, hw->vs->gb_shader, SVGA_RELOC_READ);
 553       if (ret != PIPE_OK)
 554          return ret;
 555    }
 556    svga->rebind.flags.vs = 0;
 557
 558    if (svga->rebind.flags.gs && hw->gs && hw->gs->gb_shader) {
 559       ret = swc->resource_rebind(swc, NULL, hw->gs->gb_shader, SVGA_RELOC_READ);
 560       if (ret != PIPE_OK)
 561          return ret;
 562    }
 563    svga->rebind.flags.gs = 0;
 564
 565    if (svga->rebind.flags.fs && hw->fs && hw->fs->gb_shader) {
 566       ret = swc->resource_rebind(swc, NULL, hw->fs->gb_shader, SVGA_RELOC_READ);
 567       if (ret != PIPE_OK)
 568          return ret;
 569    }
 570    svga->rebind.flags.fs = 0;
 571
 572    return PIPE_OK;
 573 }