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_glsl_types.h"
  25 #include "st_nir.h"
  26
  27 #include "compiler/nir/nir_builder.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    enum pipe_shader_type p_stage = pipe_shader_type_from_mesa(nir->info.stage);
  37    bool is_scalar =
  38       screen->get_shader_param(screen, p_stage, PIPE_SHADER_CAP_SCALAR_ISA);
  39
  40    nir->info.name = ralloc_strdup(nir, name);
  41    nir->info.separate_shader = true;
  42    if (nir->info.stage == MESA_SHADER_FRAGMENT)
  43       nir->info.fs.untyped_color_outputs = true;
  44
  45    NIR_PASS_V(nir, nir_lower_global_vars_to_local);
  46    NIR_PASS_V(nir, nir_split_var_copies);
  47    NIR_PASS_V(nir, nir_lower_var_copies);
  48    NIR_PASS_V(nir, nir_lower_system_values);
  49
  50    if (is_scalar) {
  51       nir_variable_mode mask =
  52          (nir->info.stage > MESA_SHADER_VERTEX ? nir_var_shader_in : 0) |
  53          (nir->info.stage < MESA_SHADER_FRAGMENT ? nir_var_shader_out : 0);
  54
  55       NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask);
  56    }
  57
  58    st_nir_opts(nir, is_scalar);
  59
  60    nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
  61
  62    st_nir_assign_varying_locations(st, nir);
  63
  64    st_nir_lower_samplers(screen, nir, NULL, NULL);
  65
  66    if (st->ctx->Const.PackedDriverUniformStorage) {
  67       NIR_PASS_V(nir, nir_lower_io, nir_var_uniform, st_glsl_type_dword_size,
  68                  (nir_lower_io_options)0);
  69       NIR_PASS_V(nir, nir_lower_uniforms_to_ubo, 4);
  70    } else {
  71       NIR_PASS_V(nir, nir_lower_io, nir_var_uniform, st_glsl_uniforms_type_size,
  72                  (nir_lower_io_options)0);
  73    }
  74
  75    struct pipe_shader_state state = {
  76       .type = PIPE_SHADER_IR_NIR,
  77       .ir.nir = nir,
  78    };
  79
  80    switch (nir->info.stage) {
  81    case MESA_SHADER_VERTEX:
  82       return pipe->create_vs_state(pipe, &state);
  83    case MESA_SHADER_TESS_CTRL:
  84       return pipe->create_tcs_state(pipe, &state);
  85    case MESA_SHADER_TESS_EVAL:
  86       return pipe->create_tes_state(pipe, &state);
  87    case MESA_SHADER_GEOMETRY:
  88       return pipe->create_gs_state(pipe, &state);
  89    case MESA_SHADER_FRAGMENT:
  90       return pipe->create_fs_state(pipe, &state);
  91    default:
  92       unreachable("unsupported shader stage");
  93       return NULL;
  94    }
  95 }
  96
  97 /**
  98  * Make a simple shader that copies inputs to corresponding outputs.
  99  */
 100 struct pipe_shader_state *
 101 st_nir_make_passthrough_shader(struct st_context *st,
 102                                const char *shader_name,
 103                                gl_shader_stage stage,
 104                                unsigned num_vars,
 105                                unsigned *input_locations,
 106                                unsigned *output_locations,
 107                                unsigned *interpolation_modes,
 108                                unsigned sysval_mask)
 109 {
 110    struct nir_builder b;
 111    const struct glsl_type *vec4 = glsl_vec4_type();
 112    const nir_shader_compiler_options *options =
 113       st->ctx->Const.ShaderCompilerOptions[stage].NirOptions;
 114
 115    nir_builder_init_simple_shader(&b, NULL, stage, options);
 116
 117    char var_name[15];
 118
 119    for (unsigned i = 0; i < num_vars; i++) {
 120       nir_variable *in;
 121       if (sysval_mask & (1 << i)) {
 122          snprintf(var_name, sizeof(var_name), "sys_%u", input_locations[i]);
 123          in = nir_variable_create(b.shader, nir_var_system_value,
 124                                   glsl_int_type(), var_name);
 125          in->data.interpolation = INTERP_MODE_FLAT;
 126       } else {
 127          snprintf(var_name, sizeof(var_name), "in_%u", input_locations[i]);
 128          in = nir_variable_create(b.shader, nir_var_shader_in, vec4, var_name);
 129       }
 130       in->data.location = input_locations[i];
 131       if (interpolation_modes)
 132          in->data.interpolation = interpolation_modes[i];
 133
 134       snprintf(var_name, sizeof(var_name), "out_%u", output_locations[i]);
 135       nir_variable *out =
 136          nir_variable_create(b.shader, nir_var_shader_out, in->type, var_name);
 137       out->data.location = output_locations[i];
 138       out->data.interpolation = in->data.interpolation;
 139
 140       nir_copy_var(&b, out, in);
 141    }
 142
 143    return st_nir_finish_builtin_shader(st, b.shader, shader_name);
 144 }