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Merge pull request #17 from shpuld/fix/revert-clipping-vfpu-asm
Fix: revert changes to vfpu clipping asm, it was too good to be true
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1 changed files with 0 additions and 9 deletions
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@ -289,22 +289,13 @@ namespace quake
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"addu $10, $10, $8\n" // $10 = $10 + $8
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"addu $10, $10, $8\n" // $10 = $10 + $8
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"addiu %0, $0, 1\n" // res = 1
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"addiu %0, $0, 1\n" // res = 1
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"vzero.q C600\n" // C600 = [0.0f, 0.0f, 0.0f. 0.0f]
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"vzero.q C600\n" // C600 = [0.0f, 0.0f, 0.0f. 0.0f]
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"vone.s S500\n"
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"0:\n" // loop
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"0:\n" // loop
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"lv.s S610, 8($8)\n" // S610 = v[i].xyz[0]
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"lv.s S610, 8($8)\n" // S610 = v[i].xyz[0]
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"lv.s S611, 12($8)\n" // S611 = v[i].xyz[1]
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"lv.s S611, 12($8)\n" // S611 = v[i].xyz[1]
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"lv.s S612, 16($8)\n" // S612 = v[i].xyz[2]
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"lv.s S612, 16($8)\n" // S612 = v[i].xyz[2]
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"vhtfm4.q C620, M700, C610\n" // C620 = frustrum * v[i].xyz
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"vhtfm4.q C620, M700, C610\n" // C620 = frustrum * v[i].xyz
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/* shpuld: older code checked if vertex is outside any clipping plane
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"vcmp.q LT, C620, C600\n" // S620 < 0.0f || S621 < 0.0f || S622 < 0.0f || S623 < 0.0f
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"vcmp.q LT, C620, C600\n" // S620 < 0.0f || S621 < 0.0f || S622 < 0.0f || S623 < 0.0f
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"bvt 4, 1f\n" // if ( CC[4] == 1 ) jump to exit
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"bvt 4, 1f\n" // if ( CC[4] == 1 ) jump to exit
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*/
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/* newer code checks if vertex is outside 2 clipping planes, as psp isn't that aggressive */
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"vslt.q C630, C620, C600\n" // C630 = S620 < 0.f, S621 < 0.f, S622 < 0.f, S623 < 0.f
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"vfad.q S510, C630\n" // S510 = sum of C630.q
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"vcmp.s GT, S510, S500\n" // S510 > 1
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"bvt 0, 1f\n" // exit if true
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"addiu $8, $8, 20\n" // $8 = $8 + 20( sizeof( gu_vert_t ) ) ( delay slot )
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"addiu $8, $8, 20\n" // $8 = $8 + 20( sizeof( gu_vert_t ) ) ( delay slot )
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"bne $10, $8, 0b\n" // if ( $10 != $8 ) jump to loop
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"bne $10, $8, 0b\n" // if ( $10 != $8 ) jump to loop
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"nop\n" // ( delay slot )
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"nop\n" // ( delay slot )
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