src/mesa/state_tracker/st_nir_builtins.c

   1 /*
   2  * Copyright © 2018 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 shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include "tgsi/tgsi_from_mesa.h"
  24 #include "st_nir.h"
  25
  26 #include "compiler/nir/nir_builder.h"
  27
  28 struct pipe_shader_state *
  29 st_nir_finish_builtin_shader(struct st_context *st,
  30                              nir_shader *nir,
  31                              const char *name)
  32 {
  33    struct pipe_context *pipe = st->pipe;
  34    struct pipe_screen *screen = pipe->screen;
  35
  36    nir->info.name = ralloc_strdup(nir, name);
  37    nir->info.separate_shader = true;
  38    if (nir->info.stage == MESA_SHADER_FRAGMENT)
  39       nir->info.fs.untyped_color_outputs = true;
  40
  41    NIR_PASS_V(nir, nir_lower_global_vars_to_local);
  42    NIR_PASS_V(nir, nir_split_var_copies);
  43    NIR_PASS_V(nir, nir_lower_var_copies);
  44    NIR_PASS_V(nir, nir_lower_system_values);
  45
  46    if (nir->options->lower_to_scalar) {
  47       nir_variable_mode mask =
  48          (nir->info.stage > MESA_SHADER_VERTEX ? nir_var_shader_in : 0) |
  49          (nir->info.stage < MESA_SHADER_FRAGMENT ? nir_var_shader_out : 0);
  50
  51       NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask);
  52    }
  53
  54    nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
  55
  56    st_nir_assign_vs_in_locations(nir);
  57    st_nir_assign_varying_locations(st, nir);
  58
  59    st_nir_lower_samplers(screen, nir, NULL, NULL);
  60    st_nir_lower_uniforms(st, nir);
  61
  62    if (screen->finalize_nir)
  63       screen->finalize_nir(screen, nir, true);
  64    else
  65       st_nir_opts(nir);
  66
  67    struct pipe_shader_state state = {
  68       .type = PIPE_SHADER_IR_NIR,
  69       .ir.nir = nir,
  70    };
  71
  72    switch (nir->info.stage) {
  73    case MESA_SHADER_VERTEX:
  74       return pipe->create_vs_state(pipe, &state);
  75    case MESA_SHADER_TESS_CTRL:
  76       return pipe->create_tcs_state(pipe, &state);
  77    case MESA_SHADER_TESS_EVAL:
  78       return pipe->create_tes_state(pipe, &state);
  79    case MESA_SHADER_GEOMETRY:
  80       return pipe->create_gs_state(pipe, &state);
  81    case MESA_SHADER_FRAGMENT:
  82       return pipe->create_fs_state(pipe, &state);
  83    default:
  84       unreachable("unsupported shader stage");
  85       return NULL;
  86    }
  87 }
  88
  89 /**
  90  * Make a simple shader that copies inputs to corresponding outputs.
  91  */
  92 struct pipe_shader_state *
  93 st_nir_make_passthrough_shader(struct st_context *st,
  94                                const char *shader_name,
  95                                gl_shader_stage stage,
  96                                unsigned num_vars,
  97                                unsigned *input_locations,
  98                                unsigned *output_locations,
  99                                unsigned *interpolation_modes,
 100                                unsigned sysval_mask)
 101 {
 102    struct nir_builder b;
 103    const struct glsl_type *vec4 = glsl_vec4_type();
 104    const nir_shader_compiler_options *options =
 105       st->ctx->Const.ShaderCompilerOptions[stage].NirOptions;
 106
 107    nir_builder_init_simple_shader(&b, NULL, stage, options);
 108
 109    char var_name[15];
 110
 111    for (unsigned i = 0; i < num_vars; i++) {
 112       nir_variable *in;
 113       if (sysval_mask & (1 << i)) {
 114          snprintf(var_name, sizeof(var_name), "sys_%u", input_locations[i]);
 115          in = nir_variable_create(b.shader, nir_var_system_value,
 116                                   glsl_int_type(), var_name);
 117          in->data.interpolation = INTERP_MODE_FLAT;
 118       } else {
 119          snprintf(var_name, sizeof(var_name), "in_%u", input_locations[i]);
 120          in = nir_variable_create(b.shader, nir_var_shader_in, vec4, var_name);
 121       }
 122       in->data.location = input_locations[i];
 123       if (interpolation_modes)
 124          in->data.interpolation = interpolation_modes[i];
 125
 126       snprintf(var_name, sizeof(var_name), "out_%u", output_locations[i]);
 127       nir_variable *out =
 128          nir_variable_create(b.shader, nir_var_shader_out, in->type, var_name);
 129       out->data.location = output_locations[i];
 130       out->data.interpolation = in->data.interpolation;
 131
 132       nir_copy_var(&b, out, in);
 133    }
 134
 135    return st_nir_finish_builtin_shader(st, b.shader, shader_name);
 136 }