src/intel/compiler/brw_vec4_vs_visitor.cpp

   1 /*
   2  * Copyright © 2013 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24
  25 #include "brw_vec4_vs.h"
  26 #include "dev/gen_debug.h"
  27
  28 namespace brw {
  29
  30 void
  31 vec4_vs_visitor::emit_prolog()
  32 {
  33 }
  34
  35
  36 void
  37 vec4_vs_visitor::emit_urb_write_header(int mrf)
  38 {
  39    /* No need to do anything for VS; an implied write to this MRF will be
  40     * performed by VS_OPCODE_URB_WRITE.
  41     */
  42    (void) mrf;
  43 }
  44
  45
  46 vec4_instruction *
  47 vec4_vs_visitor::emit_urb_write_opcode(bool complete)
  48 {
  49    /* For VS, the URB writes end the thread. */
  50    if (complete) {
  51       if (INTEL_DEBUG & DEBUG_SHADER_TIME)
  52          emit_shader_time_end();
  53    }
  54
  55    vec4_instruction *inst = emit(VS_OPCODE_URB_WRITE);
  56    inst->urb_write_flags = complete ?
  57       BRW_URB_WRITE_EOT_COMPLETE : BRW_URB_WRITE_NO_FLAGS;
  58
  59    return inst;
  60 }
  61
  62
  63 void
  64 vec4_vs_visitor::emit_urb_slot(dst_reg reg, int varying)
  65 {
  66    reg.type = BRW_REGISTER_TYPE_F;
  67    output_reg[varying][0].type = reg.type;
  68
  69    switch (varying) {
  70    case VARYING_SLOT_COL0:
  71    case VARYING_SLOT_COL1:
  72    case VARYING_SLOT_BFC0:
  73    case VARYING_SLOT_BFC1: {
  74       /* These built-in varyings are only supported in compatibility mode,
  75        * and we only support GS in core profile.  So, this must be a vertex
  76        * shader.
  77        */
  78       vec4_instruction *inst = emit_generic_urb_slot(reg, varying, 0);
  79       if (inst && key->clamp_vertex_color)
  80          inst->saturate = true;
  81       break;
  82    }
  83    default:
  84       return vec4_visitor::emit_urb_slot(reg, varying);
  85    }
  86 }
  87
  88
  89 void
  90 vec4_vs_visitor::emit_thread_end()
  91 {
  92    /* For VS, we always end the thread by emitting a single vertex.
  93     * emit_urb_write_opcode() will take care of setting the eot flag on the
  94     * SEND instruction.
  95     */
  96    emit_vertex();
  97 }
  98
  99
 100 vec4_vs_visitor::vec4_vs_visitor(const struct brw_compiler *compiler,
 101                                  void *log_data,
 102                                  const struct brw_vs_prog_key *key,
 103                                  struct brw_vs_prog_data *vs_prog_data,
 104                                  const nir_shader *shader,
 105                                  void *mem_ctx,
 106                                  int shader_time_index)
 107    : vec4_visitor(compiler, log_data, &key->base.tex, &vs_prog_data->base,
 108                   shader, mem_ctx, false /* no_spills */, shader_time_index),
 109      key(key),
 110      vs_prog_data(vs_prog_data)
 111 {
 112 }
 113
 114
 115 } /* namespace brw */