src/mesa/drivers/dri/i965/brw_tes.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file brw_tes.c
  26  *
  27  * Tessellation evaluation shader state upload code.
  28  */
  29
  30 #include "brw_context.h"
  31 #include "brw_nir.h"
  32 #include "brw_program.h"
  33 #include "brw_shader.h"
  34 #include "brw_state.h"
  35 #include "program/prog_parameter.h"
  36
  37 static void
  38 brw_tes_debug_recompile(struct brw_context *brw, struct gl_program *prog,
  39                        const struct brw_tes_prog_key *key)
  40 {
  41    struct brw_cache_item *c = NULL;
  42    const struct brw_tes_prog_key *old_key = NULL;
  43    bool found = false;
  44
  45    perf_debug("Recompiling tessellation evaluation shader for program %d\n",
  46               prog->Id);
  47
  48    for (unsigned int i = 0; i < brw->cache.size; i++) {
  49       for (c = brw->cache.items[i]; c; c = c->next) {
  50          if (c->cache_id == BRW_CACHE_TES_PROG) {
  51             old_key = c->key;
  52
  53             if (old_key->program_string_id == key->program_string_id)
  54                break;
  55          }
  56       }
  57       if (c)
  58          break;
  59    }
  60
  61    if (!c) {
  62       perf_debug("  Didn't find previous compile in the shader cache for "
  63                  "debug\n");
  64       return;
  65    }
  66
  67    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
  68    found |= key_debug(brw, "inputs read", old_key->inputs_read,
  69                       key->inputs_read);
  70    found |= key_debug(brw, "patch inputs read", old_key->patch_inputs_read,
  71                       key->patch_inputs_read);
  72
  73    if (!found) {
  74       perf_debug("  Something else\n");
  75    }
  76 }
  77
  78 static bool
  79 brw_codegen_tes_prog(struct brw_context *brw,
  80                      struct gl_shader_program *shader_prog,
  81                      struct brw_program *tep,
  82                      struct brw_tes_prog_key *key)
  83 {
  84    const struct brw_compiler *compiler = brw->screen->compiler;
  85    const struct gen_device_info *devinfo = &brw->screen->devinfo;
  86    struct brw_stage_state *stage_state = &brw->tes.base;
  87    nir_shader *nir = tep->program.nir;
  88    struct brw_tes_prog_data prog_data;
  89    bool start_busy = false;
  90    double start_time = 0;
  91
  92    memset(&prog_data, 0, sizeof(prog_data));
  93
  94    brw_assign_common_binding_table_offsets(MESA_SHADER_TESS_EVAL, devinfo,
  95                                            shader_prog, &tep->program,
  96                                            &prog_data.base.base, 0);
  97
  98    switch (tep->program.info.tes.spacing) {
  99    case GL_EQUAL:
 100       prog_data.partitioning = BRW_TESS_PARTITIONING_INTEGER;
 101       break;
 102    case GL_FRACTIONAL_ODD:
 103       prog_data.partitioning = BRW_TESS_PARTITIONING_ODD_FRACTIONAL;
 104       break;
 105    case GL_FRACTIONAL_EVEN:
 106       prog_data.partitioning = BRW_TESS_PARTITIONING_EVEN_FRACTIONAL;
 107       break;
 108    default:
 109       unreachable("invalid domain shader spacing");
 110    }
 111
 112    switch (tep->program.info.tes.primitive_mode) {
 113    case GL_QUADS:
 114       prog_data.domain = BRW_TESS_DOMAIN_QUAD;
 115       break;
 116    case GL_TRIANGLES:
 117       prog_data.domain = BRW_TESS_DOMAIN_TRI;
 118       break;
 119    case GL_ISOLINES:
 120       prog_data.domain = BRW_TESS_DOMAIN_ISOLINE;
 121       break;
 122    default:
 123       unreachable("invalid domain shader primitive mode");
 124    }
 125
 126    if (tep->program.info.tes.point_mode) {
 127       prog_data.output_topology = BRW_TESS_OUTPUT_TOPOLOGY_POINT;
 128    } else if (tep->program.info.tes.primitive_mode == GL_ISOLINES) {
 129       prog_data.output_topology = BRW_TESS_OUTPUT_TOPOLOGY_LINE;
 130    } else {
 131       /* Hardware winding order is backwards from OpenGL */
 132       switch (tep->program.info.tes.vertex_order) {
 133       case GL_CCW:
 134          prog_data.output_topology = BRW_TESS_OUTPUT_TOPOLOGY_TRI_CW;
 135          break;
 136       case GL_CW:
 137          prog_data.output_topology = BRW_TESS_OUTPUT_TOPOLOGY_TRI_CCW;
 138          break;
 139       default:
 140          unreachable("invalid domain shader vertex order");
 141       }
 142    }
 143
 144    /* Allocate the references to the uniforms that will end up in the
 145     * prog_data associated with the compiled program, and which will be freed
 146     * by the state cache.
 147     *
 148     * Note: param_count needs to be num_uniform_components * 4, since we add
 149     * padding around uniform values below vec4 size, so the worst case is that
 150     * every uniform is a float which gets padded to the size of a vec4.
 151     */
 152    int param_count = nir->num_uniforms / 4;
 153
 154    prog_data.base.base.param =
 155       rzalloc_array(NULL, const gl_constant_value *, param_count);
 156    prog_data.base.base.pull_param =
 157       rzalloc_array(NULL, const gl_constant_value *, param_count);
 158    prog_data.base.base.image_param =
 159       rzalloc_array(NULL, struct brw_image_param,
 160                     tep->program.info.num_images);
 161    prog_data.base.base.nr_params = param_count;
 162    prog_data.base.base.nr_image_params = tep->program.info.num_images;
 163
 164    brw_nir_setup_glsl_uniforms(nir, shader_prog, &tep->program,
 165                                &prog_data.base.base,
 166                                compiler->scalar_stage[MESA_SHADER_TESS_EVAL]);
 167
 168    int st_index = -1;
 169    if (unlikely(INTEL_DEBUG & DEBUG_SHADER_TIME))
 170       st_index = brw_get_shader_time_index(brw, &tep->program, ST_TES, true);
 171
 172    if (unlikely(brw->perf_debug)) {
 173       start_busy = brw->batch.last_bo && drm_intel_bo_busy(brw->batch.last_bo);
 174       start_time = get_time();
 175    }
 176
 177    void *mem_ctx = ralloc_context(NULL);
 178    unsigned program_size;
 179    char *error_str;
 180    const unsigned *program =
 181       brw_compile_tes(compiler, brw, mem_ctx, key, &prog_data, nir,
 182                       shader_prog, st_index, &program_size, &error_str);
 183    if (program == NULL) {
 184       tep->program.sh.data->LinkStatus = false;
 185       ralloc_strcat(&tep->program.sh.data->InfoLog, error_str);
 186
 187       _mesa_problem(NULL, "Failed to compile tessellation evaluation shader: "
 188                     "%s\n", error_str);
 189
 190       ralloc_free(mem_ctx);
 191       return false;
 192    }
 193
 194    if (unlikely(brw->perf_debug)) {
 195       if (tep->compiled_once) {
 196          brw_tes_debug_recompile(brw, &tep->program, key);
 197       }
 198       if (start_busy && !drm_intel_bo_busy(brw->batch.last_bo)) {
 199          perf_debug("TES compile took %.03f ms and stalled the GPU\n",
 200                     (get_time() - start_time) * 1000);
 201       }
 202       tep->compiled_once = true;
 203    }
 204
 205    /* Scratch space is used for register spilling */
 206    brw_alloc_stage_scratch(brw, stage_state,
 207                            prog_data.base.base.total_scratch,
 208                            devinfo->max_tes_threads);
 209
 210    brw_upload_cache(&brw->cache, BRW_CACHE_TES_PROG,
 211                     key, sizeof(*key),
 212                     program, program_size,
 213                     &prog_data, sizeof(prog_data),
 214                     &stage_state->prog_offset, &brw->tes.base.prog_data);
 215    ralloc_free(mem_ctx);
 216
 217    return true;
 218 }
 219
 220 void
 221 brw_tes_populate_key(struct brw_context *brw,
 222                      struct brw_tes_prog_key *key)
 223 {
 224    struct brw_program *tcp = (struct brw_program *) brw->tess_ctrl_program;
 225    struct brw_program *tep = (struct brw_program *) brw->tess_eval_program;
 226    struct gl_program *prog = &tep->program;
 227
 228    uint64_t per_vertex_slots = prog->info.inputs_read;
 229    uint32_t per_patch_slots = prog->info.patch_inputs_read;
 230
 231    memset(key, 0, sizeof(*key));
 232
 233    key->program_string_id = tep->id;
 234
 235    /* The TCS may have additional outputs which aren't read by the
 236     * TES (possibly for cross-thread communication).  These need to
 237     * be stored in the Patch URB Entry as well.
 238     */
 239    if (tcp) {
 240       struct gl_program *tcp_prog = &tcp->program;
 241       per_vertex_slots |= tcp_prog->info.outputs_written;
 242       per_patch_slots |= tcp_prog->info.patch_outputs_written;
 243    }
 244
 245    /* Ignore gl_TessLevelInner/Outer - we treat them as system values,
 246     * not inputs, and they're always present in the URB entry regardless
 247     * of whether or not we read them.
 248     */
 249    key->inputs_read = per_vertex_slots &
 250       ~(VARYING_BIT_TESS_LEVEL_INNER | VARYING_BIT_TESS_LEVEL_OUTER);
 251    key->patch_inputs_read = per_patch_slots;
 252
 253    /* _NEW_TEXTURE */
 254    brw_populate_sampler_prog_key_data(&brw->ctx, prog, &key->tex);
 255 }
 256
 257 void
 258 brw_upload_tes_prog(struct brw_context *brw)
 259 {
 260    struct gl_shader_program **current = brw->ctx._Shader->CurrentProgram;
 261    struct brw_stage_state *stage_state = &brw->tes.base;
 262    struct brw_tes_prog_key key;
 263    /* BRW_NEW_TESS_PROGRAMS */
 264    struct brw_program *tep = (struct brw_program *) brw->tess_eval_program;
 265
 266    if (!brw_state_dirty(brw,
 267                         _NEW_TEXTURE,
 268                         BRW_NEW_TESS_PROGRAMS))
 269       return;
 270
 271    brw_tes_populate_key(brw, &key);
 272
 273    if (!brw_search_cache(&brw->cache, BRW_CACHE_TES_PROG,
 274                          &key, sizeof(key),
 275                          &stage_state->prog_offset,
 276                          &brw->tes.base.prog_data)) {
 277       bool success = brw_codegen_tes_prog(brw, current[MESA_SHADER_TESS_EVAL],
 278                                           tep, &key);
 279       assert(success);
 280       (void)success;
 281    }
 282 }
 283
 284
 285 bool
 286 brw_tes_precompile(struct gl_context *ctx,
 287                    struct gl_shader_program *shader_prog,
 288                    struct gl_program *prog)
 289 {
 290    struct brw_context *brw = brw_context(ctx);
 291    struct brw_tes_prog_key key;
 292    uint32_t old_prog_offset = brw->tes.base.prog_offset;
 293    struct brw_stage_prog_data *old_prog_data = brw->tes.base.prog_data;
 294    bool success;
 295
 296    struct brw_program *btep = brw_program(prog);
 297
 298    memset(&key, 0, sizeof(key));
 299
 300    key.program_string_id = btep->id;
 301    key.inputs_read = prog->nir->info->inputs_read;
 302    key.patch_inputs_read = prog->nir->info->patch_inputs_read;
 303
 304    if (shader_prog->_LinkedShaders[MESA_SHADER_TESS_CTRL]) {
 305       struct gl_program *tcp =
 306          shader_prog->_LinkedShaders[MESA_SHADER_TESS_CTRL]->Program;
 307       key.inputs_read |= tcp->nir->info->outputs_written;
 308       key.patch_inputs_read |= tcp->nir->info->patch_outputs_written;
 309    }
 310
 311    /* Ignore gl_TessLevelInner/Outer - they're system values. */
 312    key.inputs_read &= ~(VARYING_BIT_TESS_LEVEL_INNER |
 313                         VARYING_BIT_TESS_LEVEL_OUTER);
 314
 315    brw_setup_tex_for_precompile(brw, &key.tex, prog);
 316
 317    success = brw_codegen_tes_prog(brw, shader_prog, btep, &key);
 318
 319    brw->tes.base.prog_offset = old_prog_offset;
 320    brw->tes.base.prog_data = old_prog_data;
 321
 322    return success;
 323 }