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path: root/src/intel/compiler/brw_clip_tri.c
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Diffstat (limited to 'src/intel/compiler/brw_clip_tri.c')
-rw-r--r--src/intel/compiler/brw_clip_tri.c662
1 files changed, 662 insertions, 0 deletions
diff --git a/src/intel/compiler/brw_clip_tri.c b/src/intel/compiler/brw_clip_tri.c
new file mode 100644
index 00000000000..8ccf9e49b20
--- /dev/null
+++ b/src/intel/compiler/brw_clip_tri.c
@@ -0,0 +1,662 @@
+/*
+ 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 <[email protected]>
+ */
+
+#include "main/macros.h"
+#include "main/enums.h"
+#include "program/program.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 gen_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->key.contains_flat_varying)
+ brw_clip_tri_flat_shade(c);
+
+ if ((c->key.clip_mode == BRW_CLIP_MODE_NORMAL) ||
+ (c->key.clip_mode == BRW_CLIP_MODE_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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 23:21:28 +0000