src/mesa/drivers/dri/i965/brw_nir_uniforms.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_shader.h"
  25 #include "brw_nir.h"
  26 #include "glsl/ir.h"
  27 #include "glsl/ir_uniform.h"
  28
  29 static void
  30 brw_nir_setup_glsl_builtin_uniform(nir_variable *var,
  31                                    const struct gl_program *prog,
  32                                    struct brw_stage_prog_data *stage_prog_data,
  33                                    unsigned comps_per_unit)
  34 {
  35    const nir_state_slot *const slots = var->state_slots;
  36    assert(var->state_slots != NULL);
  37
  38    unsigned uniform_index = var->data.driver_location * comps_per_unit;
  39    for (unsigned int i = 0; i < var->num_state_slots; i++) {
  40       /* This state reference has already been setup by ir_to_mesa, but we'll
  41        * get the same index back here.
  42        */
  43       int index = _mesa_add_state_reference(prog->Parameters,
  44                                             (gl_state_index *)slots[i].tokens);
  45
  46       /* Add each of the unique swizzles of the element as a parameter.
  47        * This'll end up matching the expected layout of the
  48        * array/matrix/structure we're trying to fill in.
  49        */
  50       int last_swiz = -1;
  51       for (unsigned j = 0; j < 4; j++) {
  52          int swiz = GET_SWZ(slots[i].swizzle, j);
  53
  54          /* If we hit a pair of identical swizzles, this means we've hit the
  55           * end of the builtin variable.  In scalar mode, we should just quit
  56           * and move on to the next one.  In vec4, we need to continue and pad
  57           * it out to 4 components.
  58           */
  59          if (swiz == last_swiz && comps_per_unit == 1)
  60             break;
  61
  62          last_swiz = swiz;
  63
  64          stage_prog_data->param[uniform_index++] =
  65             &prog->Parameters->ParameterValues[index][swiz];
  66       }
  67    }
  68 }
  69
  70 static void
  71 brw_nir_setup_glsl_uniform(gl_shader_stage stage, nir_variable *var,
  72                            struct gl_shader_program *shader_prog,
  73                            struct brw_stage_prog_data *stage_prog_data,
  74                            unsigned comps_per_unit)
  75 {
  76    int namelen = strlen(var->name);
  77
  78    /* The data for our (non-builtin) uniforms is stored in a series of
  79     * gl_uniform_driver_storage structs for each subcomponent that
  80     * glGetUniformLocation() could name.  We know it's been set up in the same
  81     * order we'd walk the type, so walk the list of storage and find anything
  82     * with our name, or the prefix of a component that starts with our name.
  83     */
  84    unsigned uniform_index = var->data.driver_location * comps_per_unit;
  85    for (unsigned u = 0; u < shader_prog->NumUniformStorage; u++) {
  86       struct gl_uniform_storage *storage = &shader_prog->UniformStorage[u];
  87
  88       if (storage->builtin)
  89          continue;
  90
  91       if (strncmp(var->name, storage->name, namelen) != 0 ||
  92           (storage->name[namelen] != 0 &&
  93            storage->name[namelen] != '.' &&
  94            storage->name[namelen] != '[')) {
  95          continue;
  96       }
  97
  98       if (storage->type->is_image()) {
  99          brw_setup_image_uniform_values(stage, stage_prog_data,
 100                                         uniform_index, storage);
 101       } else {
 102          gl_constant_value *components = storage->storage;
 103          unsigned vector_count = (MAX2(storage->array_elements, 1) *
 104                                   storage->type->matrix_columns);
 105          unsigned vector_size = storage->type->vector_elements;
 106
 107          for (unsigned s = 0; s < vector_count; s++) {
 108             unsigned i;
 109             for (i = 0; i < vector_size; i++) {
 110                stage_prog_data->param[uniform_index++] = components++;
 111             }
 112
 113             /* Pad out with zeros if needed (only needed for vec4) */
 114             for (; i < comps_per_unit; i++) {
 115                static const gl_constant_value zero = { 0.0 };
 116                stage_prog_data->param[uniform_index++] = &zero;
 117             }
 118          }
 119       }
 120    }
 121 }
 122
 123 void
 124 brw_nir_setup_glsl_uniforms(nir_shader *shader,
 125                             struct gl_shader_program *shader_prog,
 126                             const struct gl_program *prog,
 127                             struct brw_stage_prog_data *stage_prog_data,
 128                             bool is_scalar)
 129 {
 130    unsigned comps_per_unit = is_scalar ? 1 : 4;
 131
 132    foreach_list_typed(nir_variable, var, node, &shader->uniforms) {
 133       /* UBO's, atomics and samplers don't take up space in the
 134          uniform file */
 135       if (var->interface_type != NULL || var->type->contains_atomic())
 136          continue;
 137
 138       if (strncmp(var->name, "gl_", 3) == 0) {
 139          brw_nir_setup_glsl_builtin_uniform(var, prog, stage_prog_data,
 140                                             comps_per_unit);
 141       } else {
 142          brw_nir_setup_glsl_uniform(shader->stage, var, shader_prog,
 143                                     stage_prog_data, comps_per_unit);
 144       }
 145    }
 146 }
 147
 148 void
 149 brw_nir_setup_arb_uniforms(nir_shader *shader, struct gl_program *prog,
 150                            struct brw_stage_prog_data *stage_prog_data)
 151 {
 152    struct gl_program_parameter_list *plist = prog->Parameters;
 153
 154 #ifndef NDEBUG
 155    if (!shader->uniforms.is_empty()) {
 156       /* For ARB programs, only a single "parameters" variable is generated to
 157        * support uniform data.
 158        */
 159       assert(shader->uniforms.length() == 1);
 160       nir_variable *var = (nir_variable *) shader->uniforms.get_head();
 161       assert(strcmp(var->name, "parameters") == 0);
 162       assert(var->type->array_size() == (int)plist->NumParameters);
 163    }
 164 #endif
 165
 166    for (unsigned p = 0; p < plist->NumParameters; p++) {
 167       /* Parameters should be either vec4 uniforms or single component
 168        * constants; matrices and other larger types should have been broken
 169        * down earlier.
 170        */
 171       assert(plist->Parameters[p].Size <= 4);
 172
 173       unsigned i;
 174       for (i = 0; i < plist->Parameters[p].Size; i++) {
 175          stage_prog_data->param[4 * p + i] = &plist->ParameterValues[p][i];
 176       }
 177       for (; i < 4; i++) {
 178          static const gl_constant_value zero = { 0.0 };
 179          stage_prog_data->param[4 * p + i] = &zero;
 180       }
 181    }
 182 }