i965: Move clip program compilation to the compiler
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jason Ekstrand
306
src/intel/compiler/brw_clip_line.c
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306
src/intel/compiler/brw_clip_line.c
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/*
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Copyright (C) Intel Corp. 2006. All Rights Reserved.
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Intel funded Tungsten Graphics to
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develop this 3D driver.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice (including the
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next paragraph) shall be included in all copies or substantial
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portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**********************************************************************/
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/*
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* Authors:
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* Keith Whitwell <keithw@vmware.com>
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*/
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#include "main/macros.h"
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#include "main/enums.h"
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#include "program/program.h"
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#include "brw_clip.h"
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static void brw_clip_line_alloc_regs( struct brw_clip_compile *c )
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{
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const struct gen_device_info *devinfo = c->func.devinfo;
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GLuint i = 0,j;
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/* Register usage is static, precompute here:
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*/
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c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++;
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if (c->key.nr_userclip) {
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c->reg.fixed_planes = brw_vec4_grf(i, 0);
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i += (6 + c->key.nr_userclip + 1) / 2;
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c->prog_data.curb_read_length = (6 + c->key.nr_userclip + 1) / 2;
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}
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else
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c->prog_data.curb_read_length = 0;
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/* Payload vertices plus space for more generated vertices:
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*/
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for (j = 0; j < 4; j++) {
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c->reg.vertex[j] = brw_vec4_grf(i, 0);
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i += c->nr_regs;
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}
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c->reg.t = brw_vec1_grf(i, 0);
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c->reg.t0 = brw_vec1_grf(i, 1);
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c->reg.t1 = brw_vec1_grf(i, 2);
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c->reg.planemask = retype(brw_vec1_grf(i, 3), BRW_REGISTER_TYPE_UD);
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c->reg.plane_equation = brw_vec4_grf(i, 4);
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i++;
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c->reg.dp0 = brw_vec1_grf(i, 0); /* fixme - dp4 will clobber r.1,2,3 */
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c->reg.dp1 = brw_vec1_grf(i, 4);
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i++;
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if (!c->key.nr_userclip) {
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c->reg.fixed_planes = brw_vec8_grf(i, 0);
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i++;
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}
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c->reg.vertex_src_mask = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD);
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c->reg.clipdistance_offset = retype(brw_vec1_grf(i, 1), BRW_REGISTER_TYPE_W);
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i++;
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if (devinfo->gen == 5) {
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c->reg.ff_sync = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD);
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i++;
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}
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c->first_tmp = i;
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c->last_tmp = i;
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c->prog_data.urb_read_length = c->nr_regs; /* ? */
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c->prog_data.total_grf = i;
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}
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/* Line clipping, more or less following the following algorithm:
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*
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* for (p=0;p<MAX_PLANES;p++) {
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* if (clipmask & (1 << p)) {
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* GLfloat dp0 = DOTPROD( vtx0, plane[p] );
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* GLfloat dp1 = DOTPROD( vtx1, plane[p] );
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*
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* if (dp1 < 0.0f) {
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* GLfloat t = dp1 / (dp1 - dp0);
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* if (t > t1) t1 = t;
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* } else {
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* GLfloat t = dp0 / (dp0 - dp1);
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* if (t > t0) t0 = t;
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* }
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*
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* if (t0 + t1 >= 1.0)
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* return;
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* }
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* }
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*
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* interp( ctx, newvtx0, vtx0, vtx1, t0 );
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* interp( ctx, newvtx1, vtx1, vtx0, t1 );
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*
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*/
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static void clip_and_emit_line( struct brw_clip_compile *c )
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{
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struct brw_codegen *p = &c->func;
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struct brw_indirect vtx0 = brw_indirect(0, 0);
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struct brw_indirect vtx1 = brw_indirect(1, 0);
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struct brw_indirect newvtx0 = brw_indirect(2, 0);
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struct brw_indirect newvtx1 = brw_indirect(3, 0);
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struct brw_indirect plane_ptr = brw_indirect(4, 0);
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struct brw_reg v1_null_ud = retype(vec1(brw_null_reg()), BRW_REGISTER_TYPE_UD);
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GLuint hpos_offset = brw_varying_to_offset(&c->vue_map, VARYING_SLOT_POS);
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GLint clipdist0_offset = c->key.nr_userclip
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? brw_varying_to_offset(&c->vue_map, VARYING_SLOT_CLIP_DIST0)
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: 0;
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brw_MOV(p, get_addr_reg(vtx0), brw_address(c->reg.vertex[0]));
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brw_MOV(p, get_addr_reg(vtx1), brw_address(c->reg.vertex[1]));
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brw_MOV(p, get_addr_reg(newvtx0), brw_address(c->reg.vertex[2]));
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brw_MOV(p, get_addr_reg(newvtx1), brw_address(c->reg.vertex[3]));
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brw_MOV(p, get_addr_reg(plane_ptr), brw_clip_plane0_address(c));
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/* Note: init t0, t1 together:
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*/
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brw_MOV(p, vec2(c->reg.t0), brw_imm_f(0));
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brw_clip_init_planes(c);
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brw_clip_init_clipmask(c);
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/* -ve rhw workaround */
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if (p->devinfo->has_negative_rhw_bug) {
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brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2),
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brw_imm_ud(1<<20));
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brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ);
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brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(0x3f));
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brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL);
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}
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/* Set the initial vertex source mask: The first 6 planes are the bounds
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* of the view volume; the next 8 planes are the user clipping planes.
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*/
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brw_MOV(p, c->reg.vertex_src_mask, brw_imm_ud(0x3fc0));
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/* Set the initial clipdistance offset to be 6 floats before gl_ClipDistance[0].
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* We'll increment 6 times before we start hitting actual user clipping. */
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brw_MOV(p, c->reg.clipdistance_offset, brw_imm_d(clipdist0_offset - 6*sizeof(float)));
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brw_DO(p, BRW_EXECUTE_1);
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{
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/* if (planemask & 1)
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*/
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brw_AND(p, v1_null_ud, c->reg.planemask, brw_imm_ud(1));
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brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ);
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brw_IF(p, BRW_EXECUTE_1);
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{
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brw_AND(p, v1_null_ud, c->reg.vertex_src_mask, brw_imm_ud(1));
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brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ);
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brw_IF(p, BRW_EXECUTE_1);
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{
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/* user clip distance: just fetch the correct float from each vertex */
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struct brw_indirect temp_ptr = brw_indirect(7, 0);
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brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx0), c->reg.clipdistance_offset);
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brw_MOV(p, c->reg.dp0, deref_1f(temp_ptr, 0));
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brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx1), c->reg.clipdistance_offset);
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brw_MOV(p, c->reg.dp1, deref_1f(temp_ptr, 0));
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}
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brw_ELSE(p);
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{
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/* fixed plane: fetch the hpos, dp4 against the plane. */
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if (c->key.nr_userclip)
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brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0));
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else
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brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0));
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brw_DP4(p, vec4(c->reg.dp0), deref_4f(vtx0, hpos_offset), c->reg.plane_equation);
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brw_DP4(p, vec4(c->reg.dp1), deref_4f(vtx1, hpos_offset), c->reg.plane_equation);
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}
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brw_ENDIF(p);
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brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_L, vec1(c->reg.dp1), brw_imm_f(0.0f));
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brw_IF(p, BRW_EXECUTE_1);
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{
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/*
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* Both can be negative on GM965/G965 due to RHW workaround
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* if so, this object should be rejected.
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*/
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if (p->devinfo->has_negative_rhw_bug) {
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brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_LE, c->reg.dp0, brw_imm_f(0.0));
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brw_IF(p, BRW_EXECUTE_1);
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{
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brw_clip_kill_thread(c);
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}
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brw_ENDIF(p);
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}
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brw_ADD(p, c->reg.t, c->reg.dp1, negate(c->reg.dp0));
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brw_math_invert(p, c->reg.t, c->reg.t);
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brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp1);
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brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t1 );
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brw_MOV(p, c->reg.t1, c->reg.t);
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brw_inst_set_pred_control(p->devinfo, brw_last_inst,
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BRW_PREDICATE_NORMAL);
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}
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brw_ELSE(p);
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{
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/* Coming back in. We know that both cannot be negative
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* because the line would have been culled in that case.
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*/
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/* If both are positive, do nothing */
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/* Only on GM965/G965 */
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if (p->devinfo->has_negative_rhw_bug) {
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brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.dp0, brw_imm_f(0.0));
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brw_IF(p, BRW_EXECUTE_1);
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}
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{
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brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1));
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brw_math_invert(p, c->reg.t, c->reg.t);
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brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0);
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brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 );
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brw_MOV(p, c->reg.t0, c->reg.t);
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brw_inst_set_pred_control(p->devinfo, brw_last_inst,
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BRW_PREDICATE_NORMAL);
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}
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if (p->devinfo->has_negative_rhw_bug) {
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brw_ENDIF(p);
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}
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}
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brw_ENDIF(p);
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}
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brw_ENDIF(p);
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/* plane_ptr++;
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*/
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brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c));
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/* while (planemask>>=1) != 0
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*/
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brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1));
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brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ);
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brw_SHR(p, c->reg.vertex_src_mask, c->reg.vertex_src_mask, brw_imm_ud(1));
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brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL);
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brw_ADD(p, c->reg.clipdistance_offset, c->reg.clipdistance_offset, brw_imm_w(sizeof(float)));
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brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL);
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}
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brw_WHILE(p);
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brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL);
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brw_ADD(p, c->reg.t, c->reg.t0, c->reg.t1);
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brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.t, brw_imm_f(1.0));
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brw_IF(p, BRW_EXECUTE_1);
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{
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brw_clip_interp_vertex(c, newvtx0, vtx0, vtx1, c->reg.t0, false);
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brw_clip_interp_vertex(c, newvtx1, vtx1, vtx0, c->reg.t1, false);
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brw_clip_emit_vue(c, newvtx0, BRW_URB_WRITE_ALLOCATE_COMPLETE,
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(_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
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| URB_WRITE_PRIM_START);
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brw_clip_emit_vue(c, newvtx1, BRW_URB_WRITE_EOT_COMPLETE,
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(_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT)
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| URB_WRITE_PRIM_END);
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}
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brw_ENDIF(p);
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brw_clip_kill_thread(c);
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}
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void brw_emit_line_clip( struct brw_clip_compile *c )
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{
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brw_clip_line_alloc_regs(c);
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brw_clip_init_ff_sync(c);
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if (c->key.contains_flat_varying) {
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if (c->key.pv_first)
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brw_clip_copy_flatshaded_attributes(c, 1, 0);
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else
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brw_clip_copy_flatshaded_attributes(c, 0, 1);
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}
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clip_and_emit_line(c);
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}
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