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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "brw_vs.h"
namespace brw {
void
vec4_vs_visitor::emit_prolog()
{
}
dst_reg *
vec4_vs_visitor::make_reg_for_system_value(int location)
{
/* VertexID is stored by the VF as the last vertex element, but
* we don't represent it with a flag in inputs_read, so we call
* it VERT_ATTRIB_MAX, which setup_attributes() picks up on.
*/
dst_reg *reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX);
switch (location) {
case SYSTEM_VALUE_BASE_VERTEX:
reg->writemask = WRITEMASK_X;
vs_prog_data->uses_basevertex = true;
break;
case SYSTEM_VALUE_BASE_INSTANCE:
reg->writemask = WRITEMASK_Y;
vs_prog_data->uses_baseinstance = true;
break;
case SYSTEM_VALUE_VERTEX_ID:
case SYSTEM_VALUE_VERTEX_ID_ZERO_BASE:
reg->writemask = WRITEMASK_Z;
vs_prog_data->uses_vertexid = true;
break;
case SYSTEM_VALUE_INSTANCE_ID:
reg->writemask = WRITEMASK_W;
vs_prog_data->uses_instanceid = true;
break;
case SYSTEM_VALUE_DRAW_ID:
reg = new(mem_ctx) dst_reg(ATTR, VERT_ATTRIB_MAX + 1);
reg->writemask = WRITEMASK_X;
vs_prog_data->uses_drawid = true;
break;
default:
unreachable("not reached");
}
return reg;
}
void
vec4_vs_visitor::emit_urb_write_header(int mrf)
{
/* No need to do anything for VS; an implied write to this MRF will be
* performed by VS_OPCODE_URB_WRITE.
*/
(void) mrf;
}
vec4_instruction *
vec4_vs_visitor::emit_urb_write_opcode(bool complete)
{
/* For VS, the URB writes end the thread. */
if (complete) {
if (INTEL_DEBUG & DEBUG_SHADER_TIME)
emit_shader_time_end();
}
vec4_instruction *inst = emit(VS_OPCODE_URB_WRITE);
inst->urb_write_flags = complete ?
BRW_URB_WRITE_EOT_COMPLETE : BRW_URB_WRITE_NO_FLAGS;
return inst;
}
void
vec4_vs_visitor::emit_urb_slot(dst_reg reg, int varying)
{
reg.type = BRW_REGISTER_TYPE_F;
output_reg[varying].type = reg.type;
switch (varying) {
case VARYING_SLOT_COL0:
case VARYING_SLOT_COL1:
case VARYING_SLOT_BFC0:
case VARYING_SLOT_BFC1: {
/* These built-in varyings are only supported in compatibility mode,
* and we only support GS in core profile. So, this must be a vertex
* shader.
*/
vec4_instruction *inst = emit_generic_urb_slot(reg, varying);
if (inst && key->clamp_vertex_color)
inst->saturate = true;
break;
}
default:
return vec4_visitor::emit_urb_slot(reg, varying);
}
}
void
vec4_vs_visitor::emit_clip_distances(dst_reg reg, int offset)
{
/* From the GLSL 1.30 spec, section 7.1 (Vertex Shader Special Variables):
*
* "If a linked set of shaders forming the vertex stage contains no
* static write to gl_ClipVertex or gl_ClipDistance, but the
* application has requested clipping against user clip planes through
* the API, then the coordinate written to gl_Position is used for
* comparison against the user clip planes."
*
* This function is only called if the shader didn't write to
* gl_ClipDistance. Accordingly, we use gl_ClipVertex to perform clipping
* if the user wrote to it; otherwise we use gl_Position.
*/
gl_varying_slot clip_vertex = VARYING_SLOT_CLIP_VERTEX;
if (!(prog_data->vue_map.slots_valid & VARYING_BIT_CLIP_VERTEX)) {
clip_vertex = VARYING_SLOT_POS;
}
for (int i = 0; i + offset < key->nr_userclip_plane_consts && i < 4;
++i) {
reg.writemask = 1 << i;
emit(DP4(reg,
src_reg(output_reg[clip_vertex]),
src_reg(this->userplane[i + offset])));
}
}
void
vec4_vs_visitor::setup_uniform_clipplane_values()
{
for (int i = 0; i < key->nr_userclip_plane_consts; ++i) {
this->userplane[i] = dst_reg(UNIFORM, this->uniforms);
this->userplane[i].type = BRW_REGISTER_TYPE_F;
for (int j = 0; j < 4; ++j) {
stage_prog_data->param[this->uniforms * 4 + j] =
(gl_constant_value *) &clip_planes[i][j];
}
++this->uniforms;
}
}
void
vec4_vs_visitor::emit_thread_end()
{
setup_uniform_clipplane_values();
/* Lower legacy ff and ClipVertex clipping to clip distances */
if (key->nr_userclip_plane_consts > 0) {
current_annotation = "user clip distances";
output_reg[VARYING_SLOT_CLIP_DIST0] = dst_reg(this, glsl_type::vec4_type);
output_reg[VARYING_SLOT_CLIP_DIST1] = dst_reg(this, glsl_type::vec4_type);
emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST0], 0);
emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST1], 4);
}
/* For VS, we always end the thread by emitting a single vertex.
* emit_urb_write_opcode() will take care of setting the eot flag on the
* SEND instruction.
*/
emit_vertex();
}
vec4_vs_visitor::vec4_vs_visitor(const struct brw_compiler *compiler,
void *log_data,
const struct brw_vs_prog_key *key,
struct brw_vs_prog_data *vs_prog_data,
const nir_shader *shader,
gl_clip_plane *clip_planes,
void *mem_ctx,
int shader_time_index,
bool use_legacy_snorm_formula)
: vec4_visitor(compiler, log_data, &key->tex, &vs_prog_data->base, shader,
mem_ctx, false /* no_spills */, shader_time_index),
key(key),
vs_prog_data(vs_prog_data),
clip_planes(clip_planes),
use_legacy_snorm_formula(use_legacy_snorm_formula)
{
}
} /* namespace brw */
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