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Merge pull request #17 from shpuld/fix/revert-clipping-vfpu-asm

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Fix: revert changes to vfpu clipping asm, it was too good to be true
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cypress 2023-09-11 10:38:34 -04:00 committed by GitHub
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source/psp/clipping.cpp
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@ -289,22 +289,13 @@ namespace quake
"addu $10, $10, $8\n" // $10 = $10 + $8 "addu $10, $10, $8\n" // $10 = $10 + $8
"addiu %0, $0, 1\n" // res = 1 "addiu %0, $0, 1\n" // res = 1
"vzero.q C600\n" // C600 = [0.0f, 0.0f, 0.0f. 0.0f] "vzero.q C600\n" // C600 = [0.0f, 0.0f, 0.0f. 0.0f]
"vone.s S500\n"
"0:\n" // loop "0:\n" // loop
"lv.s S610, 8($8)\n" // S610 = v[i].xyz[0] "lv.s S610, 8($8)\n" // S610 = v[i].xyz[0]
"lv.s S611, 12($8)\n" // S611 = v[i].xyz[1] "lv.s S611, 12($8)\n" // S611 = v[i].xyz[1]
"lv.s S612, 16($8)\n" // S612 = v[i].xyz[2] "lv.s S612, 16($8)\n" // S612 = v[i].xyz[2]
"vhtfm4.q C620, M700, C610\n" // C620 = frustrum * v[i].xyz "vhtfm4.q C620, M700, C610\n" // C620 = frustrum * v[i].xyz
/* shpuld: older code checked if vertex is outside any clipping plane
"vcmp.q LT, C620, C600\n" // S620 < 0.0f || S621 < 0.0f || S622 < 0.0f || S623 < 0.0f "vcmp.q LT, C620, C600\n" // S620 < 0.0f || S621 < 0.0f || S622 < 0.0f || S623 < 0.0f
"bvt 4, 1f\n" // if ( CC[4] == 1 ) jump to exit "bvt 4, 1f\n" // if ( CC[4] == 1 ) jump to exit
*/
/* newer code checks if vertex is outside 2 clipping planes, as psp isn't that aggressive */
"vslt.q C630, C620, C600\n" // C630 = S620 < 0.f, S621 < 0.f, S622 < 0.f, S623 < 0.f
"vfad.q S510, C630\n" // S510 = sum of C630.q
"vcmp.s GT, S510, S500\n" // S510 > 1
"bvt 0, 1f\n" // exit if true
"addiu $8, $8, 20\n" // $8 = $8 + 20( sizeof( gu_vert_t ) ) ( delay slot ) "addiu $8, $8, 20\n" // $8 = $8 + 20( sizeof( gu_vert_t ) ) ( delay slot )
"bne $10, $8, 0b\n" // if ( $10 != $8 ) jump to loop "bne $10, $8, 0b\n" // if ( $10 != $8 ) jump to loop
"nop\n" // ( delay slot ) "nop\n" // ( delay slot )