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 #include "compiler/glsl/gl_nir.h"
  28
  29 struct pipe_shader_state *
  30 st_nir_finish_builtin_shader(struct st_context *st,
  31                              nir_shader *nir,
  32                              const char *name)
  33 {
  34    struct pipe_context *pipe = st->pipe;
  35    struct pipe_screen *screen = pipe->screen;
  36
  37    nir->info.name = ralloc_strdup(nir, name);
  38    nir->info.separate_shader = true;
  39    if (nir->info.stage == MESA_SHADER_FRAGMENT)
  40       nir->info.fs.untyped_color_outputs = true;
  41
  42    NIR_PASS_V(nir, nir_lower_global_vars_to_local);
  43    NIR_PASS_V(nir, nir_split_var_copies);
  44    NIR_PASS_V(nir, nir_lower_var_copies);
  45    NIR_PASS_V(nir, nir_lower_system_values);
  46    NIR_PASS_V(nir, nir_lower_compute_system_values);
  47
  48    if (nir->options->lower_to_scalar) {
  49       nir_variable_mode mask =
  50          (nir->info.stage > MESA_SHADER_VERTEX ? nir_var_shader_in : 0) |
  51          (nir->info.stage < MESA_SHADER_FRAGMENT ? nir_var_shader_out : 0);
  52
  53       NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask);
  54    }
  55
  56    nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
  57
  58    st_nir_assign_vs_in_locations(nir);
  59    st_nir_assign_varying_locations(st, nir);
  60
  61    st_nir_lower_samplers(screen, nir, NULL, NULL);
  62    st_nir_lower_uniforms(st, nir);
  63    if (!screen->get_param(screen, PIPE_CAP_NIR_IMAGES_AS_DEREF))
  64       NIR_PASS_V(nir, gl_nir_lower_images, false);
  65
  66    if (screen->finalize_nir)
  67       screen->finalize_nir(screen, nir, true);
  68    else
  69       st_nir_opts(nir);
  70
  71    struct pipe_shader_state state = {
  72       .type = PIPE_SHADER_IR_NIR,
  73       .ir.nir = nir,
  74    };
  75
  76    switch (nir->info.stage) {
  77    case MESA_SHADER_VERTEX:
  78       return pipe->create_vs_state(pipe, &state);
  79    case MESA_SHADER_TESS_CTRL:
  80       return pipe->create_tcs_state(pipe, &state);
  81    case MESA_SHADER_TESS_EVAL:
  82       return pipe->create_tes_state(pipe, &state);
  83    case MESA_SHADER_GEOMETRY:
  84       return pipe->create_gs_state(pipe, &state);
  85    case MESA_SHADER_FRAGMENT:
  86       return pipe->create_fs_state(pipe, &state);
  87    default:
  88       unreachable("unsupported shader stage");
  89       return NULL;
  90    }
  91 }
  92
  93 /**
  94  * Make a simple shader that copies inputs to corresponding outputs.
  95  */
  96 struct pipe_shader_state *
  97 st_nir_make_passthrough_shader(struct st_context *st,
  98                                const char *shader_name,
  99                                gl_shader_stage stage,
 100                                unsigned num_vars,
 101                                unsigned *input_locations,
 102                                unsigned *output_locations,
 103                                unsigned *interpolation_modes,
 104                                unsigned sysval_mask)
 105 {
 106    struct nir_builder b;
 107    const struct glsl_type *vec4 = glsl_vec4_type();
 108    const nir_shader_compiler_options *options =
 109       st->ctx->Const.ShaderCompilerOptions[stage].NirOptions;
 110
 111    nir_builder_init_simple_shader(&b, NULL, stage, options);
 112
 113    char var_name[15];
 114
 115    for (unsigned i = 0; i < num_vars; i++) {
 116       nir_variable *in;
 117       if (sysval_mask & (1 << i)) {
 118          snprintf(var_name, sizeof(var_name), "sys_%u", input_locations[i]);
 119          in = nir_variable_create(b.shader, nir_var_system_value,
 120                                   glsl_int_type(), var_name);
 121          in->data.interpolation = INTERP_MODE_FLAT;
 122       } else {
 123          snprintf(var_name, sizeof(var_name), "in_%u", input_locations[i]);
 124          in = nir_variable_create(b.shader, nir_var_shader_in, vec4, var_name);
 125       }
 126       in->data.location = input_locations[i];
 127       if (interpolation_modes)
 128          in->data.interpolation = interpolation_modes[i];
 129
 130       snprintf(var_name, sizeof(var_name), "out_%u", output_locations[i]);
 131       nir_variable *out =
 132          nir_variable_create(b.shader, nir_var_shader_out, in->type, var_name);
 133       out->data.location = output_locations[i];
 134       out->data.interpolation = in->data.interpolation;
 135
 136       nir_copy_var(&b, out, in);
 137    }
 138
 139    return st_nir_finish_builtin_shader(st, b.shader, shader_name);
 140 }