/* Line clipping, more or less following the following algorithm: * * for (p=0;p<MAX_PLANES;p++) { * if (clipmask & (1 << p)) { * GLfloat dp0 = DOTPROD( vtx0, plane[p] ); * GLfloat dp1 = DOTPROD( vtx1, plane[p] ); * * if (dp1 < 0.0f) { * GLfloat t = dp1 / (dp1 - dp0); * if (t > t1) t1 = t; * } else { * GLfloat t = dp0 / (dp0 - dp1); * if (t > t0) t0 = t; * } * * if (t0 + t1 >= 1.0) * return; * } * } * * interp( ctx, newvtx0, vtx0, vtx1, t0 ); * interp( ctx, newvtx1, vtx1, vtx0, t1 ); * */ static void clip_and_emit_line( struct brw_clip_compile *c ) { struct brw_codegen *p = &c->func; struct brw_indirect vtx0 = brw_indirect(0, 0); struct brw_indirect vtx1 = brw_indirect(1, 0); struct brw_indirect newvtx0 = brw_indirect(2, 0); struct brw_indirect newvtx1 = brw_indirect(3, 0); struct brw_indirect plane_ptr = brw_indirect(4, 0); struct brw_reg v1_null_ud = retype(vec1(brw_null_reg()), BRW_REGISTER_TYPE_UD); GLuint hpos_offset = brw_varying_to_offset(&c->vue_map, VARYING_SLOT_POS); GLint clipdist0_offset = c->key.nr_userclip ? brw_varying_to_offset(&c->vue_map, VARYING_SLOT_CLIP_DIST0) : 0; brw_MOV(p, get_addr_reg(vtx0), brw_address(c->reg.vertex[0])); brw_MOV(p, get_addr_reg(vtx1), brw_address(c->reg.vertex[1])); brw_MOV(p, get_addr_reg(newvtx0), brw_address(c->reg.vertex[2])); brw_MOV(p, get_addr_reg(newvtx1), brw_address(c->reg.vertex[3])); brw_MOV(p, get_addr_reg(plane_ptr), brw_clip_plane0_address(c)); /* Note: init t0, t1 together: */ brw_MOV(p, vec2(c->reg.t0), brw_imm_f(0)); brw_clip_init_planes(c); brw_clip_init_clipmask(c); /* -ve rhw workaround */ if (p->devinfo->has_negative_rhw_bug) { brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2), brw_imm_ud(1<<20)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(0x3f)); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); } /* Set the initial vertex source mask: The first 6 planes are the bounds * of the view volume; the next 8 planes are the user clipping planes. */ brw_MOV(p, c->reg.vertex_src_mask, brw_imm_ud(0x3fc0)); /* Set the initial clipdistance offset to be 6 floats before gl_ClipDistance[0]. * We'll increment 6 times before we start hitting actual user clipping. */ brw_MOV(p, c->reg.clipdistance_offset, brw_imm_d(clipdist0_offset - 6*sizeof(float))); brw_DO(p, BRW_EXECUTE_1); { /* if (planemask & 1) */ brw_AND(p, v1_null_ud, c->reg.planemask, brw_imm_ud(1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_IF(p, BRW_EXECUTE_1); { brw_AND(p, v1_null_ud, c->reg.vertex_src_mask, brw_imm_ud(1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_IF(p, BRW_EXECUTE_1); { /* user clip distance: just fetch the correct float from each vertex */ struct brw_indirect temp_ptr = brw_indirect(7, 0); brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx0), c->reg.clipdistance_offset); brw_MOV(p, c->reg.dp0, deref_1f(temp_ptr, 0)); brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx1), c->reg.clipdistance_offset); brw_MOV(p, c->reg.dp1, deref_1f(temp_ptr, 0)); } brw_ELSE(p); { /* fixed plane: fetch the hpos, dp4 against the plane. */ if (c->key.nr_userclip) brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0)); else brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0)); brw_DP4(p, vec4(c->reg.dp0), deref_4f(vtx0, hpos_offset), c->reg.plane_equation); brw_DP4(p, vec4(c->reg.dp1), deref_4f(vtx1, hpos_offset), c->reg.plane_equation); } brw_ENDIF(p); brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_L, vec1(c->reg.dp1), brw_imm_f(0.0f)); brw_IF(p, BRW_EXECUTE_1); { /* * Both can be negative on GM965/G965 due to RHW workaround * if so, this object should be rejected. */ if (p->devinfo->has_negative_rhw_bug) { brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_LE, c->reg.dp0, brw_imm_f(0.0)); brw_IF(p, BRW_EXECUTE_1); { brw_clip_kill_thread(c); } brw_ENDIF(p); } brw_ADD(p, c->reg.t, c->reg.dp1, negate(c->reg.dp0)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp1); brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t1 ); brw_MOV(p, c->reg.t1, c->reg.t); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); } brw_ELSE(p); { /* Coming back in. We know that both cannot be negative * because the line would have been culled in that case. */ /* If both are positive, do nothing */ /* Only on GM965/G965 */ if (p->devinfo->has_negative_rhw_bug) { brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.dp0, brw_imm_f(0.0)); brw_IF(p, BRW_EXECUTE_1); } { brw_ADD(p, c->reg.t, c->reg.dp0, negate(c->reg.dp1)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp0); brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_G, c->reg.t, c->reg.t0 ); brw_MOV(p, c->reg.t0, c->reg.t); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); } if (p->devinfo->has_negative_rhw_bug) { brw_ENDIF(p); } } brw_ENDIF(p); } brw_ENDIF(p); /* plane_ptr++; */ brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c)); /* while (planemask>>=1) != 0 */ brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_SHR(p, c->reg.vertex_src_mask, c->reg.vertex_src_mask, brw_imm_ud(1)); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); brw_ADD(p, c->reg.clipdistance_offset, c->reg.clipdistance_offset, brw_imm_w(sizeof(float))); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); } brw_WHILE(p); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); brw_ADD(p, c->reg.t, c->reg.t0, c->reg.t1); brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.t, brw_imm_f(1.0)); brw_IF(p, BRW_EXECUTE_1); { brw_clip_interp_vertex(c, newvtx0, vtx0, vtx1, c->reg.t0, false); brw_clip_interp_vertex(c, newvtx1, vtx1, vtx0, c->reg.t1, false); brw_clip_emit_vue(c, newvtx0, BRW_URB_WRITE_ALLOCATE_COMPLETE, (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT) | URB_WRITE_PRIM_START); brw_clip_emit_vue(c, newvtx1, BRW_URB_WRITE_EOT_COMPLETE, (_3DPRIM_LINESTRIP << URB_WRITE_PRIM_TYPE_SHIFT) | URB_WRITE_PRIM_END); } brw_ENDIF(p); brw_clip_kill_thread(c); }
/* Use mesa's clipping algorithms, translated to GEN4 assembly. */ void brw_clip_tri( struct brw_clip_compile *c ) { struct brw_compile *p = &c->func; struct brw_indirect vtx = brw_indirect(0, 0); struct brw_indirect vtxPrev = brw_indirect(1, 0); struct brw_indirect vtxOut = brw_indirect(2, 0); struct brw_indirect plane_ptr = brw_indirect(3, 0); struct brw_indirect inlist_ptr = brw_indirect(4, 0); struct brw_indirect outlist_ptr = brw_indirect(5, 0); struct brw_indirect freelist_ptr = brw_indirect(6, 0); struct brw_instruction *plane_loop; struct brw_instruction *plane_active; struct brw_instruction *vertex_loop; struct brw_instruction *next_test; struct brw_instruction *prev_test; brw_MOV(p, get_addr_reg(vtxPrev), brw_address(c->reg.vertex[2]) ); brw_MOV(p, get_addr_reg(plane_ptr), brw_clip_plane0_address(c)); brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); brw_MOV(p, get_addr_reg(freelist_ptr), brw_address(c->reg.vertex[3]) ); plane_loop = brw_DO(p, BRW_EXECUTE_1); { /* if (planemask & 1) */ brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); brw_AND(p, vec1(brw_null_reg()), c->reg.planemask, brw_imm_ud(1)); plane_active = brw_IF(p, BRW_EXECUTE_1); { /* vtxOut = freelist_ptr++ */ brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(freelist_ptr) ); brw_ADD(p, get_addr_reg(freelist_ptr), get_addr_reg(freelist_ptr), brw_imm_uw(c->nr_regs * REG_SIZE)); if (c->key.nr_userclip) brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0)); else brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0)); brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); brw_MOV(p, c->reg.nr_verts, brw_imm_ud(0)); vertex_loop = brw_DO(p, BRW_EXECUTE_1); { /* vtx = *input_ptr; */ brw_MOV(p, get_addr_reg(vtx), deref_1uw(inlist_ptr, 0)); /* IS_NEGATIVE(prev) */ brw_set_conditionalmod(p, BRW_CONDITIONAL_L); brw_DP4(p, vec4(c->reg.dpPrev), deref_4f(vtxPrev, c->offset_hpos), c->reg.plane_equation); prev_test = brw_IF(p, BRW_EXECUTE_1); { /* IS_POSITIVE(next) */ brw_set_conditionalmod(p, BRW_CONDITIONAL_GE); brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, c->offset_hpos), c->reg.plane_equation); next_test = brw_IF(p, BRW_EXECUTE_1); { /* Coming back in. */ brw_ADD(p, c->reg.t, c->reg.dpPrev, negate(c->reg.dp)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dpPrev); /* If (vtxOut == 0) vtxOut = vtxPrev */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtxPrev) ); brw_set_predicate_control(p, BRW_PREDICATE_NONE); brw_clip_interp_vertex(c, vtxOut, vtxPrev, vtx, c->reg.t, GL_FALSE); /* *outlist_ptr++ = vtxOut; * nr_verts++; * vtxOut = 0; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); } brw_ENDIF(p, next_test); } prev_test = brw_ELSE(p, prev_test); { /* *outlist_ptr++ = vtxPrev; * nr_verts++; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxPrev)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); /* IS_NEGATIVE(next) */ brw_set_conditionalmod(p, BRW_CONDITIONAL_L); brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, c->offset_hpos), c->reg.plane_equation); next_test = brw_IF(p, BRW_EXECUTE_1); { /* Going out of bounds. Avoid division by zero as we * know dp != dpPrev from DIFFERENT_SIGNS, above. */ brw_ADD(p, c->reg.t, c->reg.dp, negate(c->reg.dpPrev)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp); /* If (vtxOut == 0) vtxOut = vtx */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtx) ); brw_set_predicate_control(p, BRW_PREDICATE_NONE); brw_clip_interp_vertex(c, vtxOut, vtx, vtxPrev, c->reg.t, GL_TRUE); /* *outlist_ptr++ = vtxOut; * nr_verts++; * vtxOut = 0; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); } brw_ENDIF(p, next_test); } brw_ENDIF(p, prev_test); /* vtxPrev = vtx; * inlist_ptr++; */ brw_MOV(p, get_addr_reg(vtxPrev), get_addr_reg(vtx)); brw_ADD(p, get_addr_reg(inlist_ptr), get_addr_reg(inlist_ptr), brw_imm_uw(sizeof(short))); /* while (--loopcount != 0) */ brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); } brw_WHILE(p, vertex_loop); /* vtxPrev = *(outlist_ptr-1) OR: outlist[nr_verts-1] * inlist = outlist * inlist_ptr = &inlist[0] * outlist_ptr = &outlist[0] */ brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_w(-2)); brw_MOV(p, get_addr_reg(vtxPrev), deref_1uw(outlist_ptr, 0)); brw_MOV(p, brw_vec8_grf(c->reg.inlist.nr, 0), brw_vec8_grf(c->reg.outlist.nr, 0)); brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); } brw_ENDIF(p, plane_active); /* plane_ptr++; */ brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c)); /* nr_verts >= 3 */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_GE, c->reg.nr_verts, brw_imm_ud(3)); /* && (planemask>>=1) != 0 */ brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1)); } brw_WHILE(p, plane_loop); }
/* Use mesa's clipping algorithms, translated to GEN4 assembly. */ void brw_clip_tri( struct brw_clip_compile *c ) { struct brw_codegen *p = &c->func; struct brw_indirect vtx = brw_indirect(0, 0); struct brw_indirect vtxPrev = brw_indirect(1, 0); struct brw_indirect vtxOut = brw_indirect(2, 0); struct brw_indirect plane_ptr = brw_indirect(3, 0); struct brw_indirect inlist_ptr = brw_indirect(4, 0); struct brw_indirect outlist_ptr = brw_indirect(5, 0); struct brw_indirect freelist_ptr = brw_indirect(6, 0); GLuint hpos_offset = brw_varying_to_offset(&c->vue_map, VARYING_SLOT_POS); GLint clipdist0_offset = c->key.nr_userclip ? brw_varying_to_offset(&c->vue_map, VARYING_SLOT_CLIP_DIST0) : 0; brw_MOV(p, get_addr_reg(vtxPrev), brw_address(c->reg.vertex[2]) ); brw_MOV(p, get_addr_reg(plane_ptr), brw_clip_plane0_address(c)); brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); brw_MOV(p, get_addr_reg(freelist_ptr), brw_address(c->reg.vertex[3]) ); /* Set the initial vertex source mask: The first 6 planes are the bounds * of the view volume; the next 8 planes are the user clipping planes. */ brw_MOV(p, c->reg.vertex_src_mask, brw_imm_ud(0x3fc0)); /* Set the initial clipdistance offset to be 6 floats before gl_ClipDistance[0]. * We'll increment 6 times before we start hitting actual user clipping. */ brw_MOV(p, c->reg.clipdistance_offset, brw_imm_d(clipdist0_offset - 6*sizeof(float))); brw_DO(p, BRW_EXECUTE_1); { /* if (planemask & 1) */ brw_AND(p, vec1(brw_null_reg()), c->reg.planemask, brw_imm_ud(1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_IF(p, BRW_EXECUTE_1); { /* vtxOut = freelist_ptr++ */ brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(freelist_ptr) ); brw_ADD(p, get_addr_reg(freelist_ptr), get_addr_reg(freelist_ptr), brw_imm_uw(c->nr_regs * REG_SIZE)); if (c->key.nr_userclip) brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0)); else brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0)); brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); brw_MOV(p, c->reg.nr_verts, brw_imm_ud(0)); brw_DO(p, BRW_EXECUTE_1); { /* vtx = *input_ptr; */ brw_MOV(p, get_addr_reg(vtx), deref_1uw(inlist_ptr, 0)); load_clip_distance(c, vtxPrev, c->reg.dpPrev, hpos_offset, BRW_CONDITIONAL_L); /* (prev < 0.0f) */ brw_IF(p, BRW_EXECUTE_1); { load_clip_distance(c, vtx, c->reg.dp, hpos_offset, BRW_CONDITIONAL_GE); /* IS_POSITIVE(next) */ brw_IF(p, BRW_EXECUTE_1); { /* Coming back in. */ brw_ADD(p, c->reg.t, c->reg.dpPrev, negate(c->reg.dp)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dpPrev); /* If (vtxOut == 0) vtxOut = vtxPrev */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtxPrev)); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); brw_clip_interp_vertex(c, vtxOut, vtxPrev, vtx, c->reg.t, false); /* *outlist_ptr++ = vtxOut; * nr_verts++; * vtxOut = 0; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); } brw_ENDIF(p); } brw_ELSE(p); { /* *outlist_ptr++ = vtxPrev; * nr_verts++; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxPrev)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); load_clip_distance(c, vtx, c->reg.dp, hpos_offset, BRW_CONDITIONAL_L); /* (next < 0.0f) */ brw_IF(p, BRW_EXECUTE_1); { /* Going out of bounds. Avoid division by zero as we * know dp != dpPrev from DIFFERENT_SIGNS, above. */ brw_ADD(p, c->reg.t, c->reg.dp, negate(c->reg.dpPrev)); brw_math_invert(p, c->reg.t, c->reg.t); brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp); /* If (vtxOut == 0) vtxOut = vtx */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtx)); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); brw_clip_interp_vertex(c, vtxOut, vtx, vtxPrev, c->reg.t, true); /* *outlist_ptr++ = vtxOut; * nr_verts++; * vtxOut = 0; */ brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); } brw_ENDIF(p); } brw_ENDIF(p); /* vtxPrev = vtx; * inlist_ptr++; */ brw_MOV(p, get_addr_reg(vtxPrev), get_addr_reg(vtx)); brw_ADD(p, get_addr_reg(inlist_ptr), get_addr_reg(inlist_ptr), brw_imm_uw(sizeof(short))); /* while (--loopcount != 0) */ brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); } brw_WHILE(p); brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); /* vtxPrev = *(outlist_ptr-1) OR: outlist[nr_verts-1] * inlist = outlist * inlist_ptr = &inlist[0] * outlist_ptr = &outlist[0] */ brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_w(-2)); brw_MOV(p, get_addr_reg(vtxPrev), deref_1uw(outlist_ptr, 0)); brw_MOV(p, brw_vec8_grf(c->reg.inlist.nr, 0), brw_vec8_grf(c->reg.outlist.nr, 0)); brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); } brw_ENDIF(p); /* plane_ptr++; */ brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c)); /* nr_verts >= 3 */ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_GE, c->reg.nr_verts, brw_imm_ud(3)); brw_set_default_predicate_control(p, BRW_PREDICATE_NORMAL); /* && (planemask>>=1) != 0 */ brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1)); brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); brw_SHR(p, c->reg.vertex_src_mask, c->reg.vertex_src_mask, brw_imm_ud(1)); brw_ADD(p, c->reg.clipdistance_offset, c->reg.clipdistance_offset, brw_imm_w(sizeof(float))); } brw_WHILE(p); brw_set_default_predicate_control(p, BRW_PREDICATE_NONE); }