/* * 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_vec4_vs.h" #include "dev/gen_debug.h" namespace brw { void vec4_vs_visitor::emit_prolog() { } 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() { if (key->nr_userclip_plane_consts == 0) return; assert(stage_prog_data->nr_params == (unsigned)this->uniforms * 4); brw_stage_prog_data_add_params(stage_prog_data, key->nr_userclip_plane_consts * 4); 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] = BRW_PARAM_BUILTIN_CLIP_PLANE(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, void *mem_ctx, int shader_time_index) : 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) { } } /* namespace brw */