| /* |
| Copyright (C) Intel Corp. 2006. All Rights Reserved. |
| Intel funded Tungsten Graphics to |
| develop this 3D driver. |
| |
| 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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. |
| |
| **********************************************************************/ |
| /* |
| * Authors: |
| * Keith Whitwell <keithw@vmware.com> |
| */ |
| |
| #include "main/macros.h" |
| #include "main/enums.h" |
| #include "program/program.h" |
| |
| #include "intel_batchbuffer.h" |
| |
| #include "brw_defines.h" |
| #include "brw_context.h" |
| #include "brw_eu.h" |
| #include "brw_clip.h" |
| |
| static void release_tmps( struct brw_clip_compile *c ) |
| { |
| c->last_tmp = c->first_tmp; |
| } |
| |
| |
| void brw_clip_tri_alloc_regs( struct brw_clip_compile *c, |
| GLuint nr_verts ) |
| { |
| const struct brw_device_info *devinfo = c->func.devinfo; |
| GLuint i = 0,j; |
| |
| /* Register usage is static, precompute here: |
| */ |
| c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++; |
| |
| if (c->key.nr_userclip) { |
| c->reg.fixed_planes = brw_vec4_grf(i, 0); |
| i += (6 + c->key.nr_userclip + 1) / 2; |
| |
| c->prog_data.curb_read_length = (6 + c->key.nr_userclip + 1) / 2; |
| } |
| else |
| c->prog_data.curb_read_length = 0; |
| |
| |
| /* Payload vertices plus space for more generated vertices: |
| */ |
| for (j = 0; j < nr_verts; j++) { |
| c->reg.vertex[j] = brw_vec4_grf(i, 0); |
| i += c->nr_regs; |
| } |
| |
| if (c->vue_map.num_slots % 2) { |
| /* The VUE has an odd number of slots so the last register is only half |
| * used. Fill the second half with zero. |
| */ |
| for (j = 0; j < 3; j++) { |
| GLuint delta = brw_vue_slot_to_offset(c->vue_map.num_slots); |
| |
| brw_MOV(&c->func, byte_offset(c->reg.vertex[j], delta), brw_imm_f(0)); |
| } |
| } |
| |
| c->reg.t = brw_vec1_grf(i, 0); |
| c->reg.loopcount = retype(brw_vec1_grf(i, 1), BRW_REGISTER_TYPE_D); |
| c->reg.nr_verts = retype(brw_vec1_grf(i, 2), BRW_REGISTER_TYPE_UD); |
| c->reg.planemask = retype(brw_vec1_grf(i, 3), BRW_REGISTER_TYPE_UD); |
| c->reg.plane_equation = brw_vec4_grf(i, 4); |
| i++; |
| |
| c->reg.dpPrev = brw_vec1_grf(i, 0); /* fixme - dp4 will clobber r.1,2,3 */ |
| c->reg.dp = brw_vec1_grf(i, 4); |
| i++; |
| |
| c->reg.inlist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); |
| i++; |
| |
| c->reg.outlist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); |
| i++; |
| |
| c->reg.freelist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); |
| i++; |
| |
| if (!c->key.nr_userclip) { |
| c->reg.fixed_planes = brw_vec8_grf(i, 0); |
| i++; |
| } |
| |
| if (c->key.do_unfilled) { |
| c->reg.dir = brw_vec4_grf(i, 0); |
| c->reg.offset = brw_vec4_grf(i, 4); |
| i++; |
| c->reg.tmp0 = brw_vec4_grf(i, 0); |
| c->reg.tmp1 = brw_vec4_grf(i, 4); |
| i++; |
| } |
| |
| c->reg.vertex_src_mask = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD); |
| c->reg.clipdistance_offset = retype(brw_vec1_grf(i, 1), BRW_REGISTER_TYPE_W); |
| i++; |
| |
| if (devinfo->gen == 5) { |
| c->reg.ff_sync = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD); |
| i++; |
| } |
| |
| c->first_tmp = i; |
| c->last_tmp = i; |
| |
| c->prog_data.urb_read_length = c->nr_regs; /* ? */ |
| c->prog_data.total_grf = i; |
| } |
| |
| |
| |
| void brw_clip_tri_init_vertices( struct brw_clip_compile *c ) |
| { |
| struct brw_codegen *p = &c->func; |
| struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ |
| |
| /* Initial list of indices for incoming vertexes: |
| */ |
| brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK)); |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| BRW_CONDITIONAL_EQ, |
| tmp0, |
| brw_imm_ud(_3DPRIM_TRISTRIP_REVERSE)); |
| |
| /* XXX: Is there an easier way to do this? Need to reverse every |
| * second tristrip element: Can ignore sometimes? |
| */ |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_MOV(p, get_element(c->reg.inlist, 0), brw_address(c->reg.vertex[1]) ); |
| brw_MOV(p, get_element(c->reg.inlist, 1), brw_address(c->reg.vertex[0]) ); |
| if (c->need_direction) |
| brw_MOV(p, c->reg.dir, brw_imm_f(-1)); |
| } |
| brw_ELSE(p); |
| { |
| brw_MOV(p, get_element(c->reg.inlist, 0), brw_address(c->reg.vertex[0]) ); |
| brw_MOV(p, get_element(c->reg.inlist, 1), brw_address(c->reg.vertex[1]) ); |
| if (c->need_direction) |
| brw_MOV(p, c->reg.dir, brw_imm_f(1)); |
| } |
| brw_ENDIF(p); |
| |
| brw_MOV(p, get_element(c->reg.inlist, 2), brw_address(c->reg.vertex[2]) ); |
| brw_MOV(p, brw_vec8_grf(c->reg.outlist.nr, 0), brw_imm_f(0)); |
| brw_MOV(p, c->reg.nr_verts, brw_imm_ud(3)); |
| } |
| |
| |
| |
| void brw_clip_tri_flat_shade( struct brw_clip_compile *c ) |
| { |
| struct brw_codegen *p = &c->func; |
| struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ |
| |
| brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK)); |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| BRW_CONDITIONAL_EQ, |
| tmp0, |
| brw_imm_ud(_3DPRIM_POLYGON)); |
| |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_copy_flatshaded_attributes(c, 1, 0); |
| brw_clip_copy_flatshaded_attributes(c, 2, 0); |
| } |
| brw_ELSE(p); |
| { |
| if (c->key.pv_first) { |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| BRW_CONDITIONAL_EQ, |
| tmp0, |
| brw_imm_ud(_3DPRIM_TRIFAN)); |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_copy_flatshaded_attributes(c, 0, 1); |
| brw_clip_copy_flatshaded_attributes(c, 2, 1); |
| } |
| brw_ELSE(p); |
| { |
| brw_clip_copy_flatshaded_attributes(c, 1, 0); |
| brw_clip_copy_flatshaded_attributes(c, 2, 0); |
| } |
| brw_ENDIF(p); |
| } |
| else { |
| brw_clip_copy_flatshaded_attributes(c, 0, 2); |
| brw_clip_copy_flatshaded_attributes(c, 1, 2); |
| } |
| } |
| brw_ENDIF(p); |
| } |
| |
| |
| /** |
| * Loads the clip distance for a vertex into `dst`, and ends with |
| * a comparison of it to zero with the condition `cond`. |
| * |
| * - If using a fixed plane, the distance is dot(hpos, plane). |
| * - If using a user clip plane, the distance is directly available in the vertex. |
| */ |
| static inline void |
| load_clip_distance(struct brw_clip_compile *c, struct brw_indirect vtx, |
| struct brw_reg dst, GLuint hpos_offset, int cond) |
| { |
| struct brw_codegen *p = &c->func; |
| |
| dst = vec4(dst); |
| brw_AND(p, vec1(brw_null_reg()), 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); |
| { |
| struct brw_indirect temp_ptr = brw_indirect(7, 0); |
| brw_ADD(p, get_addr_reg(temp_ptr), get_addr_reg(vtx), c->reg.clipdistance_offset); |
| brw_MOV(p, vec1(dst), deref_1f(temp_ptr, 0)); |
| } |
| brw_ELSE(p); |
| { |
| brw_MOV(p, dst, deref_4f(vtx, hpos_offset)); |
| brw_DP4(p, dst, dst, c->reg.plane_equation); |
| } |
| brw_ENDIF(p); |
| |
| brw_CMP(p, brw_null_reg(), cond, vec1(dst), brw_imm_f(0.0f)); |
| } |
| |
| |
| /* 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); |
| } |
| |
| |
| |
| void brw_clip_tri_emit_polygon(struct brw_clip_compile *c) |
| { |
| struct brw_codegen *p = &c->func; |
| |
| /* for (loopcount = nr_verts-2; loopcount > 0; loopcount--) |
| */ |
| brw_ADD(p, |
| c->reg.loopcount, |
| c->reg.nr_verts, |
| brw_imm_d(-2)); |
| brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_G); |
| |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| struct brw_indirect v0 = brw_indirect(0, 0); |
| struct brw_indirect vptr = brw_indirect(1, 0); |
| |
| brw_MOV(p, get_addr_reg(vptr), brw_address(c->reg.inlist)); |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0)); |
| |
| brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE, |
| ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT) |
| | URB_WRITE_PRIM_START)); |
| |
| brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2)); |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0)); |
| |
| brw_DO(p, BRW_EXECUTE_1); |
| { |
| brw_clip_emit_vue(c, v0, BRW_URB_WRITE_ALLOCATE_COMPLETE, |
| (_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)); |
| |
| brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2)); |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 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); |
| |
| brw_clip_emit_vue(c, v0, BRW_URB_WRITE_EOT_COMPLETE, |
| ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT) |
| | URB_WRITE_PRIM_END)); |
| } |
| brw_ENDIF(p); |
| } |
| |
| static void do_clip_tri( struct brw_clip_compile *c ) |
| { |
| brw_clip_init_planes(c); |
| |
| brw_clip_tri(c); |
| } |
| |
| |
| static void maybe_do_clip_tri( struct brw_clip_compile *c ) |
| { |
| struct brw_codegen *p = &c->func; |
| |
| brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, c->reg.planemask, brw_imm_ud(0)); |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| do_clip_tri(c); |
| } |
| brw_ENDIF(p); |
| } |
| |
| static void brw_clip_test( struct brw_clip_compile *c ) |
| { |
| struct brw_reg t = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); |
| struct brw_reg t1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); |
| struct brw_reg t2 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); |
| struct brw_reg t3 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); |
| |
| struct brw_reg v0 = get_tmp(c); |
| struct brw_reg v1 = get_tmp(c); |
| struct brw_reg v2 = get_tmp(c); |
| |
| struct brw_indirect vt0 = brw_indirect(0, 0); |
| struct brw_indirect vt1 = brw_indirect(1, 0); |
| struct brw_indirect vt2 = brw_indirect(2, 0); |
| |
| struct brw_codegen *p = &c->func; |
| struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ |
| |
| GLuint hpos_offset = brw_varying_to_offset(&c->vue_map, |
| VARYING_SLOT_POS); |
| |
| brw_MOV(p, get_addr_reg(vt0), brw_address(c->reg.vertex[0])); |
| brw_MOV(p, get_addr_reg(vt1), brw_address(c->reg.vertex[1])); |
| brw_MOV(p, get_addr_reg(vt2), brw_address(c->reg.vertex[2])); |
| brw_MOV(p, v0, deref_4f(vt0, hpos_offset)); |
| brw_MOV(p, v1, deref_4f(vt1, hpos_offset)); |
| brw_MOV(p, v2, deref_4f(vt2, hpos_offset)); |
| brw_AND(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(~0x3f)); |
| |
| /* test nearz, xmin, ymin plane */ |
| /* clip.xyz < -clip.w */ |
| brw_CMP(p, t1, BRW_CONDITIONAL_L, v0, negate(get_element(v0, 3))); |
| brw_CMP(p, t2, BRW_CONDITIONAL_L, v1, negate(get_element(v1, 3))); |
| brw_CMP(p, t3, BRW_CONDITIONAL_L, v2, negate(get_element(v2, 3))); |
| |
| /* All vertices are outside of a plane, rejected */ |
| brw_AND(p, t, t1, t2); |
| brw_AND(p, t, t, t3); |
| brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1)); |
| brw_OR(p, tmp0, tmp0, get_element(t, 2)); |
| brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1)); |
| brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_kill_thread(c); |
| } |
| brw_ENDIF(p); |
| brw_set_default_predicate_control(p, BRW_PREDICATE_NONE); |
| |
| /* some vertices are inside a plane, some are outside,need to clip */ |
| brw_XOR(p, t, t1, t2); |
| brw_XOR(p, t1, t2, t3); |
| brw_OR(p, t, t, t1); |
| brw_AND(p, t, t, brw_imm_ud(0x1)); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 0), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<5))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 1), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<3))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 2), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<1))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| |
| /* test farz, xmax, ymax plane */ |
| /* clip.xyz > clip.w */ |
| brw_CMP(p, t1, BRW_CONDITIONAL_G, v0, get_element(v0, 3)); |
| brw_CMP(p, t2, BRW_CONDITIONAL_G, v1, get_element(v1, 3)); |
| brw_CMP(p, t3, BRW_CONDITIONAL_G, v2, get_element(v2, 3)); |
| |
| /* All vertices are outside of a plane, rejected */ |
| brw_AND(p, t, t1, t2); |
| brw_AND(p, t, t, t3); |
| brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1)); |
| brw_OR(p, tmp0, tmp0, get_element(t, 2)); |
| brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1)); |
| brw_inst_set_cond_modifier(p->devinfo, brw_last_inst, BRW_CONDITIONAL_NZ); |
| brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_kill_thread(c); |
| } |
| brw_ENDIF(p); |
| brw_set_default_predicate_control(p, BRW_PREDICATE_NONE); |
| |
| /* some vertices are inside a plane, some are outside,need to clip */ |
| brw_XOR(p, t, t1, t2); |
| brw_XOR(p, t1, t2, t3); |
| brw_OR(p, t, t, t1); |
| brw_AND(p, t, t, brw_imm_ud(0x1)); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 0), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<4))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 1), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<2))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, |
| get_element(t, 2), brw_imm_ud(0)); |
| brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<0))); |
| brw_inst_set_pred_control(p->devinfo, brw_last_inst, BRW_PREDICATE_NORMAL); |
| |
| release_tmps(c); |
| } |
| |
| |
| void brw_emit_tri_clip( struct brw_clip_compile *c ) |
| { |
| struct brw_codegen *p = &c->func; |
| brw_clip_tri_alloc_regs(c, 3 + c->key.nr_userclip + 6); |
| brw_clip_tri_init_vertices(c); |
| brw_clip_init_clipmask(c); |
| brw_clip_init_ff_sync(c); |
| |
| /* if -ve rhw workaround bit is set, |
| do cliptest */ |
| 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_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_test(c); |
| } |
| brw_ENDIF(p); |
| } |
| /* Can't push into do_clip_tri because with polygon (or quad) |
| * flatshading, need to apply the flatshade here because we don't |
| * respect the PV when converting to trifan for emit: |
| */ |
| if (c->has_flat_shading) |
| brw_clip_tri_flat_shade(c); |
| |
| if ((c->key.clip_mode == BRW_CLIPMODE_NORMAL) || |
| (c->key.clip_mode == BRW_CLIPMODE_KERNEL_CLIP)) |
| do_clip_tri(c); |
| else |
| maybe_do_clip_tri(c); |
| |
| brw_clip_tri_emit_polygon(c); |
| |
| /* Send an empty message to kill the thread: |
| */ |
| brw_clip_kill_thread(c); |
| } |