| /* |
| Copyright (C) Intel Corp. 2006. All Rights Reserved. |
| Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.com> |
| */ |
| |
| #include "brw_defines.h" |
| #include "brw_context.h" |
| #include "brw_eu.h" |
| #include "brw_util.h" |
| #include "brw_clip.h" |
| |
| |
| |
| /* This is performed against the original triangles, so no indirection |
| * required: |
| BZZZT! |
| */ |
| static void compute_tri_direction( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_reg e = c->reg.tmp0; |
| struct brw_reg f = c->reg.tmp1; |
| struct brw_reg v0 = byte_offset(c->reg.vertex[0], c->offset[VERT_RESULT_HPOS]); |
| struct brw_reg v1 = byte_offset(c->reg.vertex[1], c->offset[VERT_RESULT_HPOS]); |
| struct brw_reg v2 = byte_offset(c->reg.vertex[2], c->offset[VERT_RESULT_HPOS]); |
| |
| |
| /* Calculate the vectors of two edges of the triangle: |
| */ |
| brw_ADD(p, e, v0, negate(v2)); |
| brw_ADD(p, f, v1, negate(v2)); |
| |
| /* Take their crossproduct: |
| */ |
| brw_set_access_mode(p, BRW_ALIGN_16); |
| brw_MUL(p, vec4(brw_null_reg()), brw_swizzle(e, 1,2,0,3), brw_swizzle(f,2,0,1,3)); |
| brw_MAC(p, vec4(e), negate(brw_swizzle(e, 2,0,1,3)), brw_swizzle(f,1,2,0,3)); |
| brw_set_access_mode(p, BRW_ALIGN_1); |
| |
| brw_MUL(p, c->reg.dir, c->reg.dir, vec4(e)); |
| } |
| |
| |
| static void cull_direction( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *ccw; |
| unsigned conditional; |
| |
| assert (!(c->key.fill_ccw == CLIP_CULL && |
| c->key.fill_cw == CLIP_CULL)); |
| |
| if (c->key.fill_ccw == CLIP_CULL) |
| conditional = BRW_CONDITIONAL_GE; |
| else |
| conditional = BRW_CONDITIONAL_L; |
| |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| conditional, |
| get_element(c->reg.dir, 2), |
| brw_imm_f(0)); |
| |
| ccw = brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_kill_thread(c); |
| } |
| brw_ENDIF(p, ccw); |
| } |
| |
| |
| |
| static void copy_bfc( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *ccw; |
| unsigned conditional; |
| |
| /* Do we have any colors to copy? |
| */ |
| if (!(c->offset[VERT_RESULT_COL0] && c->offset[VERT_RESULT_BFC0]) && |
| !(c->offset[VERT_RESULT_COL1] && c->offset[VERT_RESULT_BFC1])) |
| return; |
| |
| /* In some wierd degnerate cases we can end up testing the |
| * direction twice, once for culling and once for bfc copying. Oh |
| * well, that's what you get for setting wierd GL state. |
| */ |
| if (c->key.copy_bfc_ccw) |
| conditional = BRW_CONDITIONAL_GE; |
| else |
| conditional = BRW_CONDITIONAL_L; |
| |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| conditional, |
| get_element(c->reg.dir, 2), |
| brw_imm_f(0)); |
| |
| ccw = brw_IF(p, BRW_EXECUTE_1); |
| { |
| unsigned i; |
| |
| for (i = 0; i < 3; i++) { |
| if (c->offset[VERT_RESULT_COL0] && c->offset[VERT_RESULT_BFC0]) |
| brw_MOV(p, |
| byte_offset(c->reg.vertex[i], c->offset[VERT_RESULT_COL0]), |
| byte_offset(c->reg.vertex[i], c->offset[VERT_RESULT_BFC0])); |
| |
| if (c->offset[VERT_RESULT_COL1] && c->offset[VERT_RESULT_BFC1]) |
| brw_MOV(p, |
| byte_offset(c->reg.vertex[i], c->offset[VERT_RESULT_COL1]), |
| byte_offset(c->reg.vertex[i], c->offset[VERT_RESULT_BFC1])); |
| } |
| } |
| brw_ENDIF(p, ccw); |
| } |
| |
| |
| |
| |
| /* |
| float iz = 1.0 / dir.z; |
| float ac = dir.x * iz; |
| float bc = dir.y * iz; |
| offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE; |
| offset += MAX2( abs(ac), abs(bc) ) * ctx->Polygon.OffsetFactor; |
| offset *= MRD; |
| */ |
| static void compute_offset( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_reg off = c->reg.offset; |
| struct brw_reg dir = c->reg.dir; |
| |
| brw_math_invert(p, get_element(off, 2), get_element(dir, 2)); |
| brw_MUL(p, vec2(off), dir, get_element(off, 2)); |
| |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| BRW_CONDITIONAL_GE, |
| brw_abs(get_element(off, 0)), |
| brw_abs(get_element(off, 1))); |
| |
| brw_SEL(p, vec1(off), brw_abs(get_element(off, 0)), brw_abs(get_element(off, 1))); |
| brw_set_predicate_control(p, BRW_PREDICATE_NONE); |
| |
| brw_MUL(p, vec1(off), off, brw_imm_f(c->key.offset_factor)); |
| brw_ADD(p, vec1(off), off, brw_imm_f(c->key.offset_units)); |
| } |
| |
| |
| static void merge_edgeflags( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *is_poly; |
| struct brw_reg tmp0 = get_element_ud(c->reg.tmp0, 0); |
| |
| 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)); |
| |
| /* Get away with using reg.vertex because we know that this is not |
| * a _3DPRIM_TRISTRIP_REVERSE: |
| */ |
| is_poly = brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_set_conditionalmod(p, BRW_CONDITIONAL_EQ); |
| brw_AND(p, vec1(brw_null_reg()), get_element_ud(c->reg.R0, 2), brw_imm_ud(1<<8)); |
| brw_MOV(p, byte_offset(c->reg.vertex[0], c->offset[VERT_RESULT_EDGE]), brw_imm_f(0)); |
| brw_set_predicate_control(p, BRW_PREDICATE_NONE); |
| |
| brw_set_conditionalmod(p, BRW_CONDITIONAL_EQ); |
| brw_AND(p, vec1(brw_null_reg()), get_element_ud(c->reg.R0, 2), brw_imm_ud(1<<9)); |
| brw_MOV(p, byte_offset(c->reg.vertex[2], c->offset[VERT_RESULT_EDGE]), brw_imm_f(0)); |
| brw_set_predicate_control(p, BRW_PREDICATE_NONE); |
| } |
| brw_ENDIF(p, is_poly); |
| } |
| |
| |
| |
| static void apply_one_offset( struct brw_clip_compile *c, |
| struct brw_indirect vert ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_reg pos = deref_4f(vert, c->offset[VERT_RESULT_HPOS]); |
| struct brw_reg z = get_element(pos, 2); |
| |
| brw_ADD(p, z, z, vec1(c->reg.offset)); |
| } |
| |
| |
| |
| /*********************************************************************** |
| * Output clipped polygon as an unfilled primitive: |
| */ |
| static void emit_lines(struct brw_clip_compile *c, |
| boolean do_offset) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *loop; |
| struct brw_instruction *draw_edge; |
| struct brw_indirect v0 = brw_indirect(0, 0); |
| struct brw_indirect v1 = brw_indirect(1, 0); |
| struct brw_indirect v0ptr = brw_indirect(2, 0); |
| struct brw_indirect v1ptr = brw_indirect(3, 0); |
| |
| /* Need a seperate loop for offset: |
| */ |
| if (do_offset) { |
| brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); |
| brw_MOV(p, get_addr_reg(v0ptr), brw_address(c->reg.inlist)); |
| |
| loop = brw_DO(p, BRW_EXECUTE_1); |
| { |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(v0ptr, 0)); |
| brw_ADD(p, get_addr_reg(v0ptr), get_addr_reg(v0ptr), brw_imm_uw(2)); |
| |
| apply_one_offset(c, v0); |
| |
| brw_set_conditionalmod(p, BRW_CONDITIONAL_G); |
| brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); |
| } |
| brw_WHILE(p, loop); |
| } |
| |
| /* v1ptr = &inlist[nr_verts] |
| * *v1ptr = v0 |
| */ |
| brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); |
| brw_MOV(p, get_addr_reg(v0ptr), brw_address(c->reg.inlist)); |
| brw_ADD(p, get_addr_reg(v1ptr), get_addr_reg(v0ptr), retype(c->reg.nr_verts, BRW_REGISTER_TYPE_UW)); |
| brw_ADD(p, get_addr_reg(v1ptr), get_addr_reg(v1ptr), retype(c->reg.nr_verts, BRW_REGISTER_TYPE_UW)); |
| brw_MOV(p, deref_1uw(v1ptr, 0), deref_1uw(v0ptr, 0)); |
| |
| loop = brw_DO(p, BRW_EXECUTE_1); |
| { |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(v0ptr, 0)); |
| brw_MOV(p, get_addr_reg(v1), deref_1uw(v0ptr, 2)); |
| brw_ADD(p, get_addr_reg(v0ptr), get_addr_reg(v0ptr), brw_imm_uw(2)); |
| |
| /* draw edge if edgeflag != 0 */ |
| brw_CMP(p, |
| vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, |
| deref_1f(v0, c->offset[VERT_RESULT_EDGE]), |
| brw_imm_f(0)); |
| draw_edge = brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_emit_vue(c, v0, 1, 0, (_3DPRIM_LINESTRIP << 2) | R02_PRIM_START); |
| brw_clip_emit_vue(c, v1, 1, 0, (_3DPRIM_LINESTRIP << 2) | R02_PRIM_END); |
| } |
| brw_ENDIF(p, draw_edge); |
| |
| brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); |
| brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); |
| } |
| brw_WHILE(p, loop); |
| } |
| |
| |
| |
| static void emit_points(struct brw_clip_compile *c, |
| boolean do_offset ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *loop; |
| struct brw_instruction *draw_point; |
| |
| struct brw_indirect v0 = brw_indirect(0, 0); |
| struct brw_indirect v0ptr = brw_indirect(2, 0); |
| |
| brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); |
| brw_MOV(p, get_addr_reg(v0ptr), brw_address(c->reg.inlist)); |
| |
| loop = brw_DO(p, BRW_EXECUTE_1); |
| { |
| brw_MOV(p, get_addr_reg(v0), deref_1uw(v0ptr, 0)); |
| brw_ADD(p, get_addr_reg(v0ptr), get_addr_reg(v0ptr), brw_imm_uw(2)); |
| |
| /* draw if edgeflag != 0 |
| */ |
| brw_CMP(p, |
| vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, |
| deref_1f(v0, c->offset[VERT_RESULT_EDGE]), |
| brw_imm_f(0)); |
| draw_point = brw_IF(p, BRW_EXECUTE_1); |
| { |
| if (do_offset) |
| apply_one_offset(c, v0); |
| |
| brw_clip_emit_vue(c, v0, 1, 0, (_3DPRIM_POINTLIST << 2) | R02_PRIM_START | R02_PRIM_END); |
| } |
| brw_ENDIF(p, draw_point); |
| |
| brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); |
| brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); |
| } |
| brw_WHILE(p, loop); |
| } |
| |
| |
| |
| |
| |
| |
| |
| static void emit_primitives( struct brw_clip_compile *c, |
| unsigned mode, |
| boolean do_offset ) |
| { |
| switch (mode) { |
| case CLIP_FILL: |
| brw_clip_tri_emit_polygon(c); |
| break; |
| |
| case CLIP_LINE: |
| emit_lines(c, do_offset); |
| break; |
| |
| case CLIP_POINT: |
| emit_points(c, do_offset); |
| break; |
| |
| case CLIP_CULL: |
| assert(0); |
| break; |
| } |
| } |
| |
| |
| |
| static void emit_unfilled_primitives( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *ccw; |
| |
| /* Direction culling has already been done. |
| */ |
| if (c->key.fill_ccw != c->key.fill_cw && |
| c->key.fill_ccw != CLIP_CULL && |
| c->key.fill_cw != CLIP_CULL) |
| { |
| brw_CMP(p, |
| vec1(brw_null_reg()), |
| BRW_CONDITIONAL_GE, |
| get_element(c->reg.dir, 2), |
| brw_imm_f(0)); |
| |
| ccw = brw_IF(p, BRW_EXECUTE_1); |
| { |
| emit_primitives(c, c->key.fill_ccw, c->key.offset_ccw); |
| } |
| ccw = brw_ELSE(p, ccw); |
| { |
| emit_primitives(c, c->key.fill_cw, c->key.offset_cw); |
| } |
| brw_ENDIF(p, ccw); |
| } |
| else if (c->key.fill_cw != CLIP_CULL) { |
| emit_primitives(c, c->key.fill_cw, c->key.offset_cw); |
| } |
| else if (c->key.fill_ccw != CLIP_CULL) { |
| emit_primitives(c, c->key.fill_ccw, c->key.offset_ccw); |
| } |
| } |
| |
| |
| |
| |
| static void check_nr_verts( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *if_insn; |
| |
| brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.nr_verts, brw_imm_d(3)); |
| if_insn = brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_kill_thread(c); |
| } |
| brw_ENDIF(p, if_insn); |
| } |
| |
| |
| void brw_emit_unfilled_clip( struct brw_clip_compile *c ) |
| { |
| struct brw_compile *p = &c->func; |
| struct brw_instruction *do_clip; |
| |
| |
| c->need_direction = ((c->key.offset_ccw || c->key.offset_cw) || |
| (c->key.fill_ccw != c->key.fill_cw) || |
| c->key.fill_ccw == CLIP_CULL || |
| c->key.fill_cw == CLIP_CULL || |
| c->key.copy_bfc_cw || |
| c->key.copy_bfc_ccw); |
| |
| brw_clip_tri_alloc_regs(c, 3 + c->key.nr_userclip + 6); |
| brw_clip_tri_init_vertices(c); |
| |
| assert(c->offset[VERT_RESULT_EDGE]); |
| |
| if (c->key.fill_ccw == CLIP_CULL && |
| c->key.fill_cw == CLIP_CULL) { |
| brw_clip_kill_thread(c); |
| return; |
| } |
| |
| merge_edgeflags(c); |
| |
| /* Need to use the inlist indirection here: |
| */ |
| if (c->need_direction) |
| compute_tri_direction(c); |
| |
| if (c->key.fill_ccw == CLIP_CULL || |
| c->key.fill_cw == CLIP_CULL) |
| cull_direction(c); |
| |
| if (c->key.offset_ccw || |
| c->key.offset_cw) |
| compute_offset(c); |
| |
| if (c->key.copy_bfc_ccw || |
| c->key.copy_bfc_cw) |
| copy_bfc(c); |
| |
| /* Need to do this whether we clip or not: |
| */ |
| if (c->key.do_flat_shading) |
| brw_clip_tri_flat_shade(c); |
| |
| brw_clip_init_clipmask(c); |
| brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, c->reg.planemask, brw_imm_ud(0)); |
| do_clip = brw_IF(p, BRW_EXECUTE_1); |
| { |
| brw_clip_init_planes(c); |
| brw_clip_tri(c); |
| check_nr_verts(c); |
| } |
| brw_ENDIF(p, do_clip); |
| |
| emit_unfilled_primitives(c); |
| brw_clip_kill_thread(c); |
| } |
| |
| |
| |