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 "compiler/glsl/ir_uniform.h"
  27
  28 static void
  29 brw_nir_setup_glsl_builtin_uniform(nir_variable *var,
  30                                    const struct gl_program *prog,
  31                                    struct brw_stage_prog_data *stage_prog_data,
  32                                    bool is_scalar)
  33 {
  34    const nir_state_slot *const slots = var->state_slots;
  35    assert(var->state_slots != NULL);
  36
  37    unsigned uniform_index = var->data.driver_location / 4;
  38    for (unsigned int i = 0; i < var->num_state_slots; i++) {
  39       /* This state reference has already been setup by ir_to_mesa, but we'll
  40        * get the same index back here.
  41        */
  42       int index = _mesa_add_state_reference(prog->Parameters,
  43                                             (gl_state_index *)slots[i].tokens);
  44
  45       /* Add each of the unique swizzles of the element as a parameter.
  46        * This'll end up matching the expected layout of the
  47        * array/matrix/structure we're trying to fill in.
  48        */
  49       int last_swiz = -1;
  50       for (unsigned j = 0; j < 4; j++) {
  51          int swiz = GET_SWZ(slots[i].swizzle, j);
  52
  53          /* If we hit a pair of identical swizzles, this means we've hit the
  54           * end of the builtin variable.  In scalar mode, we should just quit
  55           * and move on to the next one.  In vec4, we need to continue and pad
  56           * it out to 4 components.
  57           */
  58          if (swiz == last_swiz && is_scalar)
  59             break;
  60
  61          last_swiz = swiz;
  62
  63          stage_prog_data->param[uniform_index++] =
  64             &prog->Parameters->ParameterValues[index][swiz];
  65       }
  66    }
  67 }
  68
  69 static void
  70 brw_nir_setup_glsl_uniform(gl_shader_stage stage, nir_variable *var,
  71                            struct gl_shader_program *shader_prog,
  72                            struct brw_stage_prog_data *stage_prog_data,
  73                            bool is_scalar)
  74 {
  75    int namelen = strlen(var->name);
  76
  77    /* The data for our (non-builtin) uniforms is stored in a series of
  78     * gl_uniform_driver_storage structs for each subcomponent that
  79     * glGetUniformLocation() could name.  We know it's been set up in the same
  80     * order we'd walk the type, so walk the list of storage and find anything
  81     * with our name, or the prefix of a component that starts with our name.
  82     */
  83    unsigned uniform_index = var->data.driver_location / 4;
  84    for (unsigned u = 0; u < shader_prog->NumUniformStorage; u++) {
  85       struct gl_uniform_storage *storage = &shader_prog->UniformStorage[u];
  86
  87       if (storage->builtin)
  88          continue;
  89
  90       if (strncmp(var->name, storage->name, namelen) != 0 ||
  91           (storage->name[namelen] != 0 &&
  92            storage->name[namelen] != '.' &&
  93            storage->name[namelen] != '[')) {
  94          continue;
  95       }
  96
  97       if (storage->type->is_image()) {
  98          brw_setup_image_uniform_values(stage, stage_prog_data,
  99                                         uniform_index, storage);
 100          uniform_index +=
 101             BRW_IMAGE_PARAM_SIZE * MAX2(storage->array_elements, 1);
 102       } else {
 103          gl_constant_value *components = storage->storage;
 104          unsigned vector_count = (MAX2(storage->array_elements, 1) *
 105                                   storage->type->matrix_columns);
 106          unsigned vector_size = storage->type->vector_elements;
 107
 108          for (unsigned s = 0; s < vector_count; s++) {
 109             unsigned i;
 110             for (i = 0; i < vector_size; i++) {
 111                stage_prog_data->param[uniform_index++] = components++;
 112             }
 113
 114             if (!is_scalar) {
 115                /* Pad out with zeros if needed (only needed for vec4) */
 116                for (; i < 4; i++) {
 117                   static const gl_constant_value zero = { 0.0 };
 118                   stage_prog_data->param[uniform_index++] = &zero;
 119                }
 120             }
 121          }
 122       }
 123    }
 124 }
 125
 126 void
 127 brw_nir_setup_glsl_uniforms(nir_shader *shader,
 128                             struct gl_shader_program *shader_prog,
 129                             const struct gl_program *prog,
 130                             struct brw_stage_prog_data *stage_prog_data,
 131                             bool is_scalar)
 132 {
 133    nir_foreach_variable(var, &shader->uniforms) {
 134       /* UBO's, atomics and samplers don't take up space in the
 135          uniform file */
 136       if (var->interface_type != NULL || var->type->contains_atomic())
 137          continue;
 138
 139       if (strncmp(var->name, "gl_", 3) == 0) {
 140          brw_nir_setup_glsl_builtin_uniform(var, prog, stage_prog_data,
 141                                             is_scalar);
 142       } else {
 143          brw_nir_setup_glsl_uniform(shader->stage, var, shader_prog,
 144                                     stage_prog_data, is_scalar);
 145       }
 146    }
 147 }
 148
 149 void
 150 brw_nir_setup_arb_uniforms(nir_shader *shader, struct gl_program *prog,
 151                            struct brw_stage_prog_data *stage_prog_data)
 152 {
 153    struct gl_program_parameter_list *plist = prog->Parameters;
 154
 155 #ifndef NDEBUG
 156    if (!shader->uniforms.is_empty()) {
 157       /* For ARB programs, only a single "parameters" variable is generated to
 158        * support uniform data.
 159        */
 160       assert(shader->uniforms.length() == 1);
 161       nir_variable *var = (nir_variable *) shader->uniforms.get_head();
 162       assert(strcmp(var->name, "parameters") == 0);
 163       assert(var->type->array_size() == (int)plist->NumParameters);
 164    }
 165 #endif
 166
 167    for (unsigned p = 0; p < plist->NumParameters; p++) {
 168       /* Parameters should be either vec4 uniforms or single component
 169        * constants; matrices and other larger types should have been broken
 170        * down earlier.
 171        */
 172       assert(plist->Parameters[p].Size <= 4);
 173
 174       unsigned i;
 175       for (i = 0; i < plist->Parameters[p].Size; i++) {
 176          stage_prog_data->param[4 * p + i] = &plist->ParameterValues[p][i];
 177       }
 178       for (; i < 4; i++) {
 179          static const gl_constant_value zero = { 0.0 };
 180          stage_prog_data->param[4 * p + i] = &zero;
 181       }
 182    }
 183 }