| /* |
| * 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][0].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, 0); |
| 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][0]), |
| 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][0] = |
| dst_reg(this, glsl_type::vec4_type); |
| output_reg[VARYING_SLOT_CLIP_DIST1][0] = |
| dst_reg(this, glsl_type::vec4_type); |
| output_num_components[VARYING_SLOT_CLIP_DIST0][0] = 4; |
| output_num_components[VARYING_SLOT_CLIP_DIST1][0] = 4; |
| |
| emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST0][0], 0); |
| emit_clip_distances(output_reg[VARYING_SLOT_CLIP_DIST1][0], 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 */ |
