src/gallium/drivers/svga/svga_state_vs.c

   1 /**********************************************************
   2  * Copyright 2008-2009 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_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_math.h"
  29 #include "util/u_memory.h"
  30 #include "util/u_bitmask.h"
  31 #include "translate/translate.h"
  32 #include "tgsi/tgsi_ureg.h"
  33
  34 #include "svga_context.h"
  35 #include "svga_state.h"
  36 #include "svga_cmd.h"
  37 #include "svga_shader.h"
  38 #include "svga_tgsi.h"
  39
  40 #include "svga_hw_reg.h"
  41
  42
  43 /**
  44  * If we fail to compile a vertex shader we'll use a dummy/fallback shader
  45  * that simply emits a (0,0,0,1) vertex position.
  46  */
  47 static const struct tgsi_token *
  48 get_dummy_vertex_shader(void)
  49 {
  50    static const float zero[4] = { 0.0, 0.0, 0.0, 1.0 };
  51    struct ureg_program *ureg;
  52    const struct tgsi_token *tokens;
  53    struct ureg_src src;
  54    struct ureg_dst dst;
  55    unsigned num_tokens;
  56
  57    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
  58    if (!ureg)
  59       return NULL;
  60
  61    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  62    src = ureg_DECL_immediate(ureg, zero, 4);
  63    ureg_MOV(ureg, dst, src);
  64    ureg_END(ureg);
  65
  66    tokens = ureg_get_tokens(ureg, &num_tokens);
  67
  68    ureg_destroy(ureg);
  69
  70    return tokens;
  71 }
  72
  73
  74 static struct svga_shader_variant *
  75 translate_vertex_program(struct svga_context *svga,
  76                          const struct svga_vertex_shader *vs,
  77                          const struct svga_compile_key *key)
  78 {
  79    if (svga_have_vgpu10(svga)) {
  80       return svga_tgsi_vgpu10_translate(svga, &vs->base, key,
  81                                         PIPE_SHADER_VERTEX);
  82    }
  83    else {
  84       return svga_tgsi_vgpu9_translate(svga, &vs->base, key,
  85                                        PIPE_SHADER_VERTEX);
  86    }
  87 }
  88
  89
  90 /**
  91  * Replace the given shader's instruction with a simple / dummy shader.
  92  * We use this when normal shader translation fails.
  93  */
  94 static struct svga_shader_variant *
  95 get_compiled_dummy_vertex_shader(struct svga_context *svga,
  96                                  struct svga_vertex_shader *vs,
  97                                  const struct svga_compile_key *key)
  98 {
  99    const struct tgsi_token *dummy = get_dummy_vertex_shader();
 100    struct svga_shader_variant *variant;
 101
 102    if (!dummy) {
 103       return NULL;
 104    }
 105
 106    FREE((void *) vs->base.tokens);
 107    vs->base.tokens = dummy;
 108
 109    variant = translate_vertex_program(svga, vs, key);
 110    return variant;
 111 }
 112
 113
 114 /**
 115  * Translate TGSI shader into an svga shader variant.
 116  */
 117 static enum pipe_error
 118 compile_vs(struct svga_context *svga,
 119            struct svga_vertex_shader *vs,
 120            const struct svga_compile_key *key,
 121            struct svga_shader_variant **out_variant)
 122 {
 123    struct svga_shader_variant *variant;
 124    enum pipe_error ret = PIPE_ERROR;
 125
 126    variant = translate_vertex_program(svga, vs, key);
 127    if (variant == NULL) {
 128       debug_printf("Failed to compile vertex shader,"
 129                    " using dummy shader instead.\n");
 130       variant = get_compiled_dummy_vertex_shader(svga, vs, key);
 131    }
 132    else if (svga_shader_too_large(svga, variant)) {
 133       /* too big, use dummy shader */
 134       debug_printf("Shader too large (%u bytes),"
 135                    " using dummy shader instead.\n",
 136                    (unsigned) (variant->nr_tokens
 137                                * sizeof(variant->tokens[0])));
 138       /* Free the too-large variant */
 139       svga_destroy_shader_variant(svga, SVGA3D_SHADERTYPE_VS, variant);
 140       /* Use simple pass-through shader instead */
 141       variant = get_compiled_dummy_vertex_shader(svga, vs, key);
 142    }
 143
 144    if (!variant) {
 145       return PIPE_ERROR;
 146    }
 147
 148    ret = svga_define_shader(svga, SVGA3D_SHADERTYPE_VS, variant);
 149    if (ret != PIPE_OK) {
 150       svga_destroy_shader_variant(svga, SVGA3D_SHADERTYPE_VS, variant);
 151       return ret;
 152    }
 153
 154    *out_variant = variant;
 155
 156    return PIPE_OK;
 157 }
 158
 159
 160 /* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS
 161  */
 162 static void
 163 make_vs_key(struct svga_context *svga, struct svga_compile_key *key)
 164 {
 165    const unsigned shader = PIPE_SHADER_VERTEX;
 166
 167    memset(key, 0, sizeof *key);
 168
 169    if (svga->state.sw.need_swtnl && svga_have_vgpu10(svga)) {
 170       /* Set both of these flags, to match compile_passthrough_vs() */
 171       key->vs.passthrough = 1;
 172       key->vs.undo_viewport = 1;
 173       return;
 174    }
 175
 176    /* SVGA_NEW_PRESCALE */
 177    key->vs.need_prescale = svga->state.hw_clear.prescale.enabled &&
 178                            (svga->curr.gs == NULL);
 179
 180    /* SVGA_NEW_RAST */
 181    key->vs.allow_psiz = svga->curr.rast->templ.point_size_per_vertex;
 182
 183    /* SVGA_NEW_FS */
 184    key->vs.fs_generic_inputs = svga->curr.fs->generic_inputs;
 185
 186    svga_remap_generics(key->vs.fs_generic_inputs, key->generic_remap_table);
 187
 188    /* SVGA_NEW_VELEMENT */
 189    key->vs.adjust_attrib_range = svga->curr.velems->adjust_attrib_range;
 190    key->vs.adjust_attrib_w_1 = svga->curr.velems->adjust_attrib_w_1;
 191    key->vs.attrib_is_pure_int = svga->curr.velems->attrib_is_pure_int;
 192    key->vs.adjust_attrib_itof = svga->curr.velems->adjust_attrib_itof;
 193    key->vs.adjust_attrib_utof = svga->curr.velems->adjust_attrib_utof;
 194    key->vs.attrib_is_bgra = svga->curr.velems->attrib_is_bgra;
 195    key->vs.attrib_puint_to_snorm = svga->curr.velems->attrib_puint_to_snorm;
 196    key->vs.attrib_puint_to_uscaled = svga->curr.velems->attrib_puint_to_uscaled;
 197    key->vs.attrib_puint_to_sscaled = svga->curr.velems->attrib_puint_to_sscaled;
 198
 199    /* SVGA_NEW_TEXTURE_BINDING | SVGA_NEW_SAMPLER */
 200    svga_init_shader_key_common(svga, shader, key);
 201
 202    /* SVGA_NEW_RAST */
 203    key->clip_plane_enable = svga->curr.rast->templ.clip_plane_enable;
 204 }
 205
 206
 207 /**
 208  * svga_reemit_vs_bindings - Reemit the vertex shader bindings
 209  */
 210 enum pipe_error
 211 svga_reemit_vs_bindings(struct svga_context *svga)
 212 {
 213    enum pipe_error ret;
 214    struct svga_winsys_gb_shader *gbshader = NULL;
 215    SVGA3dShaderId shaderId = SVGA3D_INVALID_ID;
 216
 217    assert(svga->rebind.flags.vs);
 218    assert(svga_have_gb_objects(svga));
 219
 220    if (svga->state.hw_draw.vs) {
 221       gbshader = svga->state.hw_draw.vs->gb_shader;
 222       shaderId = svga->state.hw_draw.vs->id;
 223    }
 224
 225    if (!svga_need_to_rebind_resources(svga)) {
 226       ret =  svga->swc->resource_rebind(svga->swc, NULL, gbshader,
 227                                         SVGA_RELOC_READ);
 228       goto out;
 229    }
 230
 231    if (svga_have_vgpu10(svga))
 232       ret = SVGA3D_vgpu10_SetShader(svga->swc, SVGA3D_SHADERTYPE_VS,
 233                                     gbshader, shaderId);
 234    else
 235       ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);
 236
 237  out:
 238    if (ret != PIPE_OK)
 239       return ret;
 240
 241    svga->rebind.flags.vs = FALSE;
 242    return PIPE_OK;
 243 }
 244
 245
 246 /**
 247  * The current vertex shader is already executed by the 'draw'
 248  * module, so we just need to generate a simple vertex shader
 249  * to pass through all those VS outputs that will
 250  * be consumed by the fragment shader.
 251  * Used when we employ the 'draw' module.
 252  */
 253 static enum pipe_error
 254 compile_passthrough_vs(struct svga_context *svga,
 255                        struct svga_vertex_shader *vs,
 256                        struct svga_fragment_shader *fs,
 257                        struct svga_shader_variant **out_variant)
 258 {
 259    struct svga_shader_variant *variant = NULL;
 260    unsigned num_inputs;
 261    unsigned i;
 262    unsigned num_elements;
 263    struct svga_vertex_shader new_vs;
 264    struct ureg_src src[PIPE_MAX_SHADER_INPUTS];
 265    struct ureg_dst dst[PIPE_MAX_SHADER_OUTPUTS];
 266    struct ureg_program *ureg;
 267    unsigned num_tokens;
 268    struct svga_compile_key key;
 269    enum pipe_error ret;
 270
 271    assert(svga_have_vgpu10(svga));
 272    assert(fs);
 273
 274    num_inputs = fs->base.info.num_inputs;
 275
 276    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
 277    if (!ureg)
 278       return PIPE_ERROR_OUT_OF_MEMORY;
 279
 280    /* draw will always add position */
 281    dst[0] = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
 282    src[0] = ureg_DECL_vs_input(ureg, 0);
 283    num_elements = 1;
 284
 285    /**
 286     * swtnl backend redefines the input layout based on the
 287     * fragment shader's inputs. So we only need to passthrough
 288     * those inputs that will be consumed by the fragment shader.
 289     * Note: DX10 requires the number of vertex elements
 290     * specified in the input layout to be no less than the
 291     * number of inputs to the vertex shader.
 292     */
 293    for (i = 0; i < num_inputs; i++) {
 294       switch (fs->base.info.input_semantic_name[i]) {
 295       case TGSI_SEMANTIC_COLOR:
 296       case TGSI_SEMANTIC_GENERIC:
 297       case TGSI_SEMANTIC_FOG:
 298          dst[num_elements] = ureg_DECL_output(ureg,
 299                                 fs->base.info.input_semantic_name[i],
 300                                 fs->base.info.input_semantic_index[i]);
 301          src[num_elements] = ureg_DECL_vs_input(ureg, num_elements);
 302          num_elements++;
 303          break;
 304       default:
 305          break;
 306       }
 307    }
 308
 309    for (i = 0; i < num_elements; i++) {
 310       ureg_MOV(ureg, dst[i], src[i]);
 311    }
 312
 313    ureg_END(ureg);
 314
 315    memset(&new_vs, 0, sizeof(new_vs));
 316    new_vs.base.tokens = ureg_get_tokens(ureg, &num_tokens);
 317    tgsi_scan_shader(new_vs.base.tokens, &new_vs.base.info);
 318
 319    memset(&key, 0, sizeof(key));
 320    key.vs.undo_viewport = 1;
 321
 322    ret = compile_vs(svga, &new_vs, &key, &variant);
 323    if (ret != PIPE_OK)
 324       return ret;
 325
 326    ureg_free_tokens(new_vs.base.tokens);
 327    ureg_destroy(ureg);
 328
 329    /* Overwrite the variant key to indicate it's a pass-through VS */
 330    memset(&variant->key, 0, sizeof(variant->key));
 331    variant->key.vs.passthrough = 1;
 332    variant->key.vs.undo_viewport = 1;
 333
 334    *out_variant = variant;
 335
 336    return PIPE_OK;
 337 }
 338
 339
 340 static enum pipe_error
 341 emit_hw_vs(struct svga_context *svga, unsigned dirty)
 342 {
 343    struct svga_shader_variant *variant;
 344    struct svga_vertex_shader *vs = svga->curr.vs;
 345    struct svga_fragment_shader *fs = svga->curr.fs;
 346    enum pipe_error ret = PIPE_OK;
 347    struct svga_compile_key key;
 348
 349    /* If there is an active geometry shader, and it has stream output
 350     * defined, then we will skip the stream output from the vertex shader
 351     */
 352    if (!svga_have_gs_streamout(svga)) {
 353       /* No GS stream out */
 354       if (svga_have_vs_streamout(svga)) {
 355          /* Set VS stream out */
 356          svga_set_stream_output(svga, vs->base.stream_output);
 357       }
 358       else {
 359          /* turn off stream out */
 360          svga_set_stream_output(svga, NULL);
 361       }
 362    }
 363
 364    /* SVGA_NEW_NEED_SWTNL */
 365    if (svga->state.sw.need_swtnl && !svga_have_vgpu10(svga)) {
 366       /* No vertex shader is needed */
 367       variant = NULL;
 368    }
 369    else {
 370       make_vs_key(svga, &key);
 371
 372       /* See if we already have a VS variant that matches the key */
 373       variant = svga_search_shader_key(&vs->base, &key);
 374
 375       if (!variant) {
 376          /* Create VS variant now */
 377          if (key.vs.passthrough) {
 378             ret = compile_passthrough_vs(svga, vs, fs, &variant);
 379          }
 380          else {
 381             ret = compile_vs(svga, vs, &key, &variant);
 382          }
 383          if (ret != PIPE_OK)
 384             return ret;
 385
 386          /* insert the new variant at head of linked list */
 387          assert(variant);
 388          variant->next = vs->base.variants;
 389          vs->base.variants = variant;
 390       }
 391    }
 392
 393    if (variant != svga->state.hw_draw.vs) {
 394       /* Bind the new variant */
 395       if (variant) {
 396          ret = svga_set_shader(svga, SVGA3D_SHADERTYPE_VS, variant);
 397          if (ret != PIPE_OK)
 398             return ret;
 399          svga->rebind.flags.vs = FALSE;
 400       }
 401
 402       svga->dirty |= SVGA_NEW_VS_VARIANT;
 403       svga->state.hw_draw.vs = variant;
 404    }
 405
 406    return PIPE_OK;
 407 }
 408
 409 struct svga_tracked_state svga_hw_vs =
 410 {
 411    "vertex shader (hwtnl)",
 412    (SVGA_NEW_VS |
 413     SVGA_NEW_FS |
 414     SVGA_NEW_TEXTURE_BINDING |
 415     SVGA_NEW_SAMPLER |
 416     SVGA_NEW_RAST |
 417     SVGA_NEW_PRESCALE |
 418     SVGA_NEW_VELEMENT |
 419     SVGA_NEW_NEED_SWTNL),
 420    emit_hw_vs
 421 };