src/mesa/drivers/dri/i965/brw_link.cpp

   1 /*
   2  * Copyright © 2015 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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_context.h"
  25 #include "brw_shader.h"
  26 #include "brw_fs.h"
  27 #include "brw_nir.h"
  28 #include "brw_program.h"
  29 #include "glsl/ir_optimization.h"
  30 #include "program/program.h"
  31 #include "main/shaderapi.h"
  32 #include "main/uniforms.h"
  33
  34 /**
  35  * Performs a compile of the shader stages even when we don't know
  36  * what non-orthogonal state will be set, in the hope that it reflects
  37  * the eventual NOS used, and thus allows us to produce link failures.
  38  */
  39 static bool
  40 brw_shader_precompile(struct gl_context *ctx,
  41                       struct gl_shader_program *sh_prog)
  42 {
  43    struct gl_shader *vs = sh_prog->_LinkedShaders[MESA_SHADER_VERTEX];
  44    struct gl_shader *tcs = sh_prog->_LinkedShaders[MESA_SHADER_TESS_CTRL];
  45    struct gl_shader *tes = sh_prog->_LinkedShaders[MESA_SHADER_TESS_EVAL];
  46    struct gl_shader *gs = sh_prog->_LinkedShaders[MESA_SHADER_GEOMETRY];
  47    struct gl_shader *fs = sh_prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
  48    struct gl_shader *cs = sh_prog->_LinkedShaders[MESA_SHADER_COMPUTE];
  49
  50    if (fs && !brw_fs_precompile(ctx, sh_prog, fs->Program))
  51       return false;
  52
  53    if (gs && !brw_gs_precompile(ctx, sh_prog, gs->Program))
  54       return false;
  55
  56    if (tes && !brw_tes_precompile(ctx, sh_prog, tes->Program))
  57       return false;
  58
  59    if (tcs && !brw_tcs_precompile(ctx, sh_prog, tcs->Program))
  60       return false;
  61
  62    if (vs && !brw_vs_precompile(ctx, sh_prog, vs->Program))
  63       return false;
  64
  65    if (cs && !brw_cs_precompile(ctx, sh_prog, cs->Program))
  66       return false;
  67
  68    return true;
  69 }
  70
  71 static void
  72 brw_lower_packing_builtins(struct brw_context *brw,
  73                            gl_shader_stage shader_type,
  74                            exec_list *ir)
  75 {
  76    /* Gens < 7 don't have instructions to convert to or from half-precision,
  77     * and Gens < 6 don't expose that functionality.
  78     */
  79    if (brw->gen != 6)
  80       return;
  81
  82    lower_packing_builtins(ir, LOWER_PACK_HALF_2x16 | LOWER_UNPACK_HALF_2x16);
  83 }
  84
  85 static void
  86 process_glsl_ir(gl_shader_stage stage,
  87                 struct brw_context *brw,
  88                 struct gl_shader_program *shader_prog,
  89                 struct gl_shader *shader)
  90 {
  91    struct gl_context *ctx = &brw->ctx;
  92    const struct brw_compiler *compiler = brw->intelScreen->compiler;
  93    const struct gl_shader_compiler_options *options =
  94       &ctx->Const.ShaderCompilerOptions[shader->Stage];
  95
  96    /* Temporary memory context for any new IR. */
  97    void *mem_ctx = ralloc_context(NULL);
  98
  99    ralloc_adopt(mem_ctx, shader->ir);
 100
 101    /* lower_packing_builtins() inserts arithmetic instructions, so it
 102     * must precede lower_instructions().
 103     */
 104    brw_lower_packing_builtins(brw, shader->Stage, shader->ir);
 105    do_mat_op_to_vec(shader->ir);
 106    lower_instructions(shader->ir,
 107                       MOD_TO_FLOOR |
 108                       DIV_TO_MUL_RCP |
 109                       SUB_TO_ADD_NEG |
 110                       EXP_TO_EXP2 |
 111                       LOG_TO_LOG2 |
 112                       LDEXP_TO_ARITH |
 113                       CARRY_TO_ARITH |
 114                       BORROW_TO_ARITH);
 115
 116    /* Pre-gen6 HW can only nest if-statements 16 deep.  Beyond this,
 117     * if-statements need to be flattened.
 118     */
 119    if (brw->gen < 6)
 120       lower_if_to_cond_assign(shader->ir, 16);
 121
 122    do_lower_texture_projection(shader->ir);
 123    brw_lower_texture_gradients(brw, shader->ir);
 124    do_vec_index_to_cond_assign(shader->ir);
 125    lower_vector_insert(shader->ir, true);
 126    lower_offset_arrays(shader->ir);
 127    brw_do_lower_unnormalized_offset(shader->ir);
 128    lower_noise(shader->ir);
 129    lower_quadop_vector(shader->ir, false);
 130
 131    bool lowered_variable_indexing =
 132       lower_variable_index_to_cond_assign((gl_shader_stage)stage,
 133                                           shader->ir,
 134                                           options->EmitNoIndirectInput,
 135                                           options->EmitNoIndirectOutput,
 136                                           options->EmitNoIndirectTemp,
 137                                           options->EmitNoIndirectUniform);
 138
 139    if (unlikely(brw->perf_debug && lowered_variable_indexing)) {
 140       perf_debug("Unsupported form of variable indexing in %s; falling "
 141                  "back to very inefficient code generation\n",
 142                  _mesa_shader_stage_to_abbrev(shader->Stage));
 143    }
 144
 145    bool progress;
 146    do {
 147       progress = false;
 148
 149       if (compiler->scalar_stage[shader->Stage]) {
 150          brw_do_channel_expressions(shader->ir);
 151          brw_do_vector_splitting(shader->ir);
 152       }
 153
 154       progress = do_lower_jumps(shader->ir, true, true,
 155                                 true, /* main return */
 156                                 false, /* continue */
 157                                 false /* loops */
 158                                 ) || progress;
 159
 160       progress = do_common_optimization(shader->ir, true, true,
 161                                         options, ctx->Const.NativeIntegers) || progress;
 162    } while (progress);
 163
 164    validate_ir_tree(shader->ir);
 165
 166    /* Now that we've finished altering the linked IR, reparent any live IR back
 167     * to the permanent memory context, and free the temporary one (discarding any
 168     * junk we optimized away).
 169     */
 170    reparent_ir(shader->ir, shader->ir);
 171    ralloc_free(mem_ctx);
 172
 173    if (ctx->_Shader->Flags & GLSL_DUMP) {
 174       fprintf(stderr, "\n");
 175       fprintf(stderr, "GLSL IR for linked %s program %d:\n",
 176               _mesa_shader_stage_to_string(shader->Stage),
 177               shader_prog->Name);
 178       _mesa_print_ir(stderr, shader->ir, NULL);
 179       fprintf(stderr, "\n");
 180    }
 181 }
 182
 183 extern "C" GLboolean
 184 brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
 185 {
 186    struct brw_context *brw = brw_context(ctx);
 187    const struct brw_compiler *compiler = brw->intelScreen->compiler;
 188    unsigned int stage;
 189
 190    for (stage = 0; stage < ARRAY_SIZE(shProg->_LinkedShaders); stage++) {
 191       struct gl_shader *shader = shProg->_LinkedShaders[stage];
 192       if (!shader)
 193          continue;
 194
 195       struct gl_program *prog =
 196          ctx->Driver.NewProgram(ctx, _mesa_shader_stage_to_program(stage),
 197                                 shader->Name);
 198       if (!prog)
 199         return false;
 200       prog->Parameters = _mesa_new_parameter_list();
 201
 202       _mesa_copy_linked_program_data((gl_shader_stage) stage, shProg, prog);
 203
 204       process_glsl_ir((gl_shader_stage) stage, brw, shProg, shader);
 205
 206       /* Make a pass over the IR to add state references for any built-in
 207        * uniforms that are used.  This has to be done now (during linking).
 208        * Code generation doesn't happen until the first time this shader is
 209        * used for rendering.  Waiting until then to generate the parameters is
 210        * too late.  At that point, the values for the built-in uniforms won't
 211        * get sent to the shader.
 212        */
 213       foreach_in_list(ir_instruction, node, shader->ir) {
 214          ir_variable *var = node->as_variable();
 215
 216          if ((var == NULL) || (var->data.mode != ir_var_uniform)
 217              || (strncmp(var->name, "gl_", 3) != 0))
 218             continue;
 219
 220          const ir_state_slot *const slots = var->get_state_slots();
 221          assert(slots != NULL);
 222
 223          for (unsigned int i = 0; i < var->get_num_state_slots(); i++) {
 224             _mesa_add_state_reference(prog->Parameters,
 225                                       (gl_state_index *) slots[i].tokens);
 226          }
 227       }
 228
 229       do_set_program_inouts(shader->ir, prog, shader->Stage);
 230
 231       prog->SamplersUsed = shader->active_samplers;
 232       prog->ShadowSamplers = shader->shadow_samplers;
 233       _mesa_update_shader_textures_used(shProg, prog);
 234
 235       _mesa_reference_program(ctx, &shader->Program, prog);
 236
 237       brw_add_texrect_params(prog);
 238
 239       prog->nir = brw_create_nir(brw, shProg, prog, (gl_shader_stage) stage,
 240                                  compiler->scalar_stage[stage]);
 241
 242       _mesa_reference_program(ctx, &prog, NULL);
 243    }
 244
 245    if ((ctx->_Shader->Flags & GLSL_DUMP) && shProg->Name != 0) {
 246       for (unsigned i = 0; i < shProg->NumShaders; i++) {
 247          const struct gl_shader *sh = shProg->Shaders[i];
 248          if (!sh)
 249             continue;
 250
 251          fprintf(stderr, "GLSL %s shader %d source for linked program %d:\n",
 252                  _mesa_shader_stage_to_string(sh->Stage),
 253                  i, shProg->Name);
 254          fprintf(stderr, "%s", sh->Source);
 255          fprintf(stderr, "\n");
 256       }
 257    }
 258
 259    if (brw->precompile && !brw_shader_precompile(ctx, shProg))
 260       return false;
 261
 262    return true;
 263 }