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