hackern64/F3DEX3
0
0
Fork 0
mirror of https://github.com/HackerN64/F3DEX3.git synced 2026-01-21 10:37:45 -08:00
Code Issues Packages Projects Releases Wiki Activity

Replaced dot product algorithm

Browse Source
This commit is contained in:
Sauraen
2024-03-31 11:02:11 -07:00
parent bd7132743a
commit 7f04ef0bb3
1 changed files with 16 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
f3dex3.s
View File

@@ -2878,16 +2878,12 @@ lt_vtx_pair:
.endif
move curLight, $3 // Point to ambient light
lt_loop:
/* TODO try this, this saves one vnop cycle before
vmudh $v29, $v31, $v31[2] // 0; clear whole accumulator
vadd $v29, vAAA, vAAA[1h] // accum lo 0 = 0 + 1, 4 = 4 + 5
vmadn vAAA, vOne, vAAA[2h] // + 2,6; built-in saturation (clamping) ends up not a problem
*/
vmudh $v29, vOne, vAAA[0h] // Sum components of dot product as signed
lpv vCCC[4], (ltBufOfs + 0 - 2*lightSize)(curLight) // Xfrmed dir in elems 0-2
vmadh $v29, vOne, vAAA[1h]
// vnop
vadd $v29, vAAA, vAAA[1h] // accum lo 0 = 0 + 1, 4 = 4 + 5
lpv vDDD[0], (ltBufOfs + 8 - 2*lightSize)(curLight) // Xfrmed dir in elems 4-6
vmadh vAAA, vOne, vAAA[2h]
vmadn vAAA, vOne, vAAA[2h] // + 2,6; built-in saturation (clamping) ends up not a problem
beq curLight, altBaseReg, lt_post
luv vBBB, (ltBufOfs + 0 - lightSize)(curLight) // Light color
vlt $v29, $v31, $v31[4] // Set VCC to 11110000
@@ -3022,13 +3018,13 @@ lt_loop:
vmrg vAAA, vAAA, vCCC // vAAA = light direction
bnez $11, lt_point
luv vDDD, (ltBufOfs + 0 - lightSize)(curLight) // Light color
vcopy vBBB, vOne // Directional light dot scaling = 0001.0001, approx == 1.0
vmulf vAAA, vAAA, vPairNrml // Light dir * normalized normals
vmudh $v29, vOne, $v31[7] // Load accum mid with 0x7FFF (1 in s.15)
vmadm vCCC, vPairRGBA, $v30[1] // + (alpha - 1) * aoDir factor; elems 3, 7
vcopy vBBB, vOne // Directional light dot scaling = 0001.0001, approx == 1.0
vmudh $v29, vOne, vAAA[0h] // Sum components of dot product as signed
vmadh $v29, vOne, vAAA[1h]
vmadh vAAA, vOne, vAAA[2h]
vmudh $v29, $v31, $v31[2] // 0; clear whole accumulator
vadd $v29, vAAA, vAAA[1h] // accum lo 0 = 0 + 1, 4 = 4 + 5
vmadn vAAA, vOne, vAAA[2h] // + 2,6; built-in saturation (clamping) ends up not a problem
lt_finish_light:
// vAAA is unclamped dot product, vBBB[2h:3h] is point light scaling on dot product,
// vCCC is amb occ factor, vDDD is light color
@@ -3094,17 +3090,17 @@ lt_skip_novtxcolor:
lt_skip_fresnel:
beqz $10, vtx_return_from_lighting // no texgen
// Texgen: vLookat0, vPairNrml, have to leave vPairPosI/F, vPairRGBA; output vPairST
vmudh $v29, vOne, vLookat0[0h]
vmudh $v29, $v31, $v31[2] // 0; clear whole accumulator
lpv vLookat1[4], (ltBufOfs + 0 - lightSize)(curLight) // Lookat 1 dir in elems 0-2
vmadh $v29, vOne, vLookat0[1h]
vadd $v29, vLookat0, vLookat0[1h] // accum lo 0 = 0 + 1, 4 = 4 + 5
lpv vDDD[0], (ltBufOfs + 8 - lightSize)(curLight) // Lookat 1 dir in elems 4-6
vmadh vLookat0, vOne, vLookat0[2h] // vLookat0 = dot product 0
vmadn vLookat0, vOne, vLookat0[2h] // + 2,6; vLookat0 = dot product 0
vlt $v29, $v31, $v31[4] // Set VCC to 11110000
vmrg vLookat1, vLookat1, vDDD // vLookat1 = lookat 1 dir
vmulf vLookat1, vPairNrml, vLookat1 // Normal * lookat 1 dir
vmudh $v29, vOne, vLookat1[0h]
vmadh $v29, vOne, vLookat1[1h]
vmadh vLookat1, vOne, vLookat1[2h] // vLookat1 = dot product 1
vmudh $v29, $v31, $v31[2] // 0; clear whole accumulator
vadd $v29, vLookat1, vLookat1[1h] // accum lo 0 = 0 + 1, 4 = 4 + 5
vmadn vLookat1, vOne, vLookat1[2h] // + 2,6; vLookat1 = dot product 1
vne $v29, $v31, $v31[1h] // Set VCC to 10111011
andi $11, $5, G_TEXTURE_GEN_LINEAR >> 8
vmrg vLookat0, vLookat0, vLookat1[0h] // Dot products in elements 0, 1, 4, 5
@@ -3156,10 +3152,10 @@ lt_normal_to_vertex:
vmadm vBBB, vCCC, vCCC[3] // PL: + len^2 int * quadratic factor frac
vmadn $v29, vDDD, vCCC[7] // PL: + len^2 frac * quadratic factor int = $v29 frac
vmadh vCCC, vCCC, vCCC[7] // PL: + len^2 int * quadratic factor int = vCCC int
vmudh vBBB, vOne, vAAA[0h] // Both: Sum components of dot product as signed
vmadh vBBB, vOne, vAAA[1h] // Both:
vmudh vBBB, $v31, $v31[2] // Both: Clear accumulator (sum dot product components)
vadd vBBB, vAAA, vAAA[1h] // Both: accum lo 0 = 0 + 1, 4 = 4 + 5
bnez $10, lt_after_camera // $10 set if computing specular or fresnel
vmadh vAAA, vOne, vAAA[2h] // Both: vAAA dot product
vmadn vAAA, vOne, vAAA[2h] // Both: + 2,6; vAAA dot product
vrcph vBBB[1], vCCC[0] // 1/(2*light factor), input of 0000.8000 -> no change normals
luv vDDD, (ltBufOfs + 0 - lightSize)(curLight) // vDDD = light color
vrcpl vBBB[2], $v29[0] // Light factor 0001.0000 -> normals /= 2