0,0 → 1,314 |
/* |
Copyright (C) Intel Corp. 2006. All Rights Reserved. |
Intel funded Tungsten Graphics to |
develop this 3D driver. |
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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/glheader.h" |
#include "main/macros.h" |
#include "main/enums.h" |
#include "program/program.h" |
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#include "intel_batchbuffer.h" |
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#include "brw_defines.h" |
#include "brw_context.h" |
#include "brw_eu.h" |
#include "brw_clip.h" |
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static void brw_clip_line_alloc_regs( struct brw_clip_compile *c ) |
{ |
const struct brw_device_info *devinfo = c->func.devinfo; |
GLuint i = 0,j; |
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/* Register usage is static, precompute here: |
*/ |
c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++; |
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if (c->key.nr_userclip) { |
c->reg.fixed_planes = brw_vec4_grf(i, 0); |
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; |
} |
else |
c->prog_data.curb_read_length = 0; |
|
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/* Payload vertices plus space for more generated vertices: |
*/ |
for (j = 0; j < 4; j++) { |
c->reg.vertex[j] = brw_vec4_grf(i, 0); |
i += c->nr_regs; |
} |
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c->reg.t = brw_vec1_grf(i, 0); |
c->reg.t0 = brw_vec1_grf(i, 1); |
c->reg.t1 = brw_vec1_grf(i, 2); |
c->reg.planemask = retype(brw_vec1_grf(i, 3), BRW_REGISTER_TYPE_UD); |
c->reg.plane_equation = brw_vec4_grf(i, 4); |
i++; |
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c->reg.dp0 = brw_vec1_grf(i, 0); /* fixme - dp4 will clobber r.1,2,3 */ |
c->reg.dp1 = brw_vec1_grf(i, 4); |
i++; |
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if (!c->key.nr_userclip) { |
c->reg.fixed_planes = brw_vec8_grf(i, 0); |
i++; |
} |
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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++; |
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if (devinfo->gen == 5) { |
c->reg.ff_sync = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD); |
i++; |
} |
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c->first_tmp = i; |
c->last_tmp = i; |
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c->prog_data.urb_read_length = c->nr_regs; /* ? */ |
c->prog_data.total_grf = i; |
} |
|
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/* 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; |
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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)); |
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/* Note: init t0, t1 together: |
*/ |
brw_MOV(p, vec2(c->reg.t0), brw_imm_f(0)); |
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brw_clip_init_planes(c); |
brw_clip_init_clipmask(c); |
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/* -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); |
} |
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/* 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)); |
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/* 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))); |
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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); |
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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)); |
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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); |
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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); |
{ |
/* |
* 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); |
} |
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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); |
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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); |
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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); |
} |
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if (p->devinfo->has_negative_rhw_bug) { |
brw_ENDIF(p); |
} |
} |
brw_ENDIF(p); |
} |
brw_ENDIF(p); |
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/* plane_ptr++; |
*/ |
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 |
*/ |
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); |
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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); |
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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); |
} |
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void brw_emit_line_clip( struct brw_clip_compile *c ) |
{ |
brw_clip_line_alloc_regs(c); |
brw_clip_init_ff_sync(c); |
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if (c->has_flat_shading) { |
if (c->key.pv_first) |
brw_clip_copy_flatshaded_attributes(c, 1, 0); |
else |
brw_clip_copy_flatshaded_attributes(c, 0, 1); |
} |
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clip_and_emit_line(c); |
} |