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https://github.com/HackerN64/F3DEX3.git
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Implemented texgen in ltadv
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Sauraen
108
f3dex3.s
108
f3dex3.s
@@ -967,14 +967,16 @@ vpWrlF equ $v13 // vertex pair World position Frac part
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vpWrlI equ $v14 // vertex pair World position Int part
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aDPosF equ $v15 // ltadv Delta Position Frac part
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aDPosI equ $v16 // ltadv Delta Position Int part
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aOffsA equ $v17 // ltadv Offset Alpha
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aOAFrs equ $v17 // ltadv Offset Alpha (elem 3,7) and Fresnel (elem 0,4)
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// Uses vpRGBA, vpLtTot, vpNrmlX, vpNrmlY, vpNrmlZ = $v18, $v19, $v20, $v21, $v22
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aParam equ $v23 // ltadv Parameters = AO, texgen, and Fresnel params
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aAOF2 equ aLen2F // Version of aAOF in init, can't be aDPosI/F or vpMdl there
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aPLFcF equ aLen2F // Point Light Factor Frac part
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aPLFcF equ aLen2F // ltadv Point Light Factor Frac part
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aLTC equ aLen2F // ltadv Light Color
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aPLFcI equ aLen2I // Point Light Factor Int part
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aLkDt0 equ aLen2F // ltadv Lookat Dot product 0 for texgen
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aPLFcI equ aLen2I // ltadv Point Light Factor Int part
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aLkDt1 equ aLen2I // ltadv Lookat Dot product 1 for texgen
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aDOT equ vpMdl // ltadv Dot product = normals dot direction; also briefly light dir
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aClOut equ vpWrlF // ltadv Color Out
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aAlOut equ vpWrlI // ltadv Alpha Out
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@@ -983,6 +985,7 @@ aDotSc equ aDPosF // ltadv Dot product Scale factor
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aLenF equ aDPosI // ltadv Length Frac part
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aAOF equ aDPosI // ltadv Ambient Occlusion Factor
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aProj equ aDPosI // ltadv Projection
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// vpST equ aOAFrs // ST used in texgen
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vpWNrm equ vpNrmlX // vertex pair World space Normals
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aRcpLn equ $v29 // ltadv Reciprocal of Length
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aLenI equ $v29 // ltadv Length Int part
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@@ -993,9 +996,8 @@ aLenI equ $v29 // ltadv Length Int part
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// always be free during vtx load or clipping.
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tempVpRGBA equ 0x00 // Only used during loop
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tempXfrmLt equ tempVpRGBA // ltbasic only used during init
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tempUnpackings equ tempVpRGBA // ltadv only during init
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tempVtx1ST equ tempVpRGBA // ltadv only during init
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tempAmbient equ 0x10 // ltbasic set during init, used during loop
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tempNormalScales equ tempAmbient // ltadv only during init
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tempPrevInvalVtxStart equ 0x20
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tempPrevInvalVtx equ (tempPrevInvalVtxStart + vtxSize) // 0x46; fog writes here
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tempPrevInvalVtxEnd equ (tempPrevInvalVtx + vtxSize) // 0x6C; rest of vtx writes here
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@@ -3297,35 +3299,45 @@ lLkDrs equ lDTC // lighting Lookat Directions
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lLkDt0 equ vpLtTot // lighting Lookat Dot product 0
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lLkDt1 equ lDOT // lighting Lookat Dot product 1
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lpv lLkDrs[0], (xfrmLookatDirs + 0)($zero) // Lookat 0 in 0-2, 1 in 4-6
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vmulf $v29, vpNrmlX, lLkDrs[0] // Normals X elems 0, 4 * lookat 0 X
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vmacf $v29, vpNrmlY, lLkDrs[1] // Normals Y elems 0, 4 * lookat 0 Y
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.macro texgen_dots, lookats, dot0, dot1
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vmulf $v29, vpNrmlX, lookats[0] // Normals X * lookat 0 X
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vmacf $v29, vpNrmlY, lookats[1] // Normals Y * lookat 0 Y
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vmacf dot0, vpNrmlZ, lookats[2] // Normals Z * lookat 0 Z
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vmulf $v29, vpNrmlX, lookats[4] // Normals X * lookat 1 X
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vmacf $v29, vpNrmlY, lookats[5] // Normals Y * lookat 1 Y
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vmacf dot1, vpNrmlZ, lookats[6] // Normals Z * lookat 1 Z
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.endmacro
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texgen_dots lLkDrs, lLkDt0, lLkDt1
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.if !CFG_NO_OCCLUSION_PLANE
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addi outVtxBase, outVtxBase, -2*vtxSize // Undo doing this twice due to repeating ST scale
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.endif
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vmacf lLkDt0, vpNrmlZ, lLkDrs[2] // Normals Z elems 0, 4 * lookat 0 Z
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vmulf $v29, vpNrmlX, lLkDrs[4] // Normals X elems 0, 4 * lookat 1 X
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vmacf $v29, vpNrmlY, lLkDrs[5] // Normals Y elems 0, 4 * lookat 1 Y
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vmacf lLkDt1, vpNrmlZ, lLkDrs[6] // Normals Z elems 0, 4 * lookat 1 Z
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vmudh lLkDt0, vOne, lLkDt0[3h] // Move lookat 0 dot product to elem 0
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lLkCns equ lLkDrs // lighting Lookat Constants
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llv lLkCns[0], (texgenLinearCoeffs - altBase)(altBaseReg)
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vne $v29, $v31, $v31[1h] // Set VCC to 10111011
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// In ltbasic, normals are in elems 3, 7; in ltadv, elems 0, 4
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vmudh lLkDt0, vOne, lLkDt0[3h] // Move dot 0 from elems 3, 7 to 0, 4
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.macro texgen_body, lookats, dot0, dot1, normalselem, branch_no_texgen_linear
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// lookats now holds texgen linear coefficients elems 0, 1
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llv lookats[0], (texgenLinearCoeffs - altBase)(altBaseReg)
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vne $v29, $v31, $v31[1h] // Set VCC to 10111011
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andi $11, vGeomMid, G_TEXTURE_GEN_LINEAR >> 8
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vmrg lLkDt0, lLkDt0, lLkDt1[3h] // Dot products in elements 0, 1, 4, 5
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vmudh $v29, vOne, $v31[5] // 1 * 0x4000
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beqz $11, vtx_return_from_texgen
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vmacf vpST, lLkDt0, $v31[5] // + dot products * 0x4000 ( / 2)
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vmrg dot0, dot0, dot1[normalselem] // Dot products in elements 0, 1, 4, 5
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vmudh $v29, vOne, $v31[5] // 1 * 0x4000
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beqz $11, branch_no_texgen_linear
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vmacf vpST, dot0, $v31[5] // + dot products * 0x4000 ( / 2)
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// Texgen_Linear:
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vmulf vpST, lLkDt0, $v31[5] // dot products * 0x4000 ( / 2)
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lLkST2 equ lLkDt0 // lighting Lookat ST squared
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vmulf lLkST2, vpST, vpST // ST squared
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vmulf $v29, vpST, $v31[7] // Move ST to accumulator (0x7FFF = 1)
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lLkTmp equ lLkDt1 // lighting Lookat Temp
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vmacf lLkTmp, vpST, lLkCns[1] // + ST * 0x6CB3
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vmudh $v29, vOne, $v31[5] // 1 * 0x4000
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vmacf vpST, vpST, lLkCns[0] // + ST * 0x44D3
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vmulf vpST, dot0, $v31[5] // dot products * 0x4000 ( / 2)
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// dot0 now holds lighting Lookat ST squared
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vmulf dot0, vpST, vpST // ST squared
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vmulf $v29, vpST, $v31[7] // Move ST to accumulator (0x7FFF = 1)
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// dot1 now holds lighting Lookat Temp
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vmacf dot1, vpST, lookats[1] // + ST * 0x6CB3
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vmudh $v29, vOne, $v31[5] // 1 * 0x4000
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vmacf vpST, vpST, lookats[0] // + ST * 0x44D3
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.endmacro
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texgen_body lLkDrs, lLkDt0, lLkDt1, 3h, vtx_return_from_texgen
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j vtx_return_from_texgen
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vmacf vpST, lLkST2, lLkTmp // + ST squared * (ST + ST * coeff)
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.macro texgen_lastinstr, dot0, dot1
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vmacf vpST, dot0, dot1 // + ST squared * (ST + ST * coeff)
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.endmacro
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texgen_lastinstr lLkDt0, lLkDt1
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ovl2_end:
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.align 8
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@@ -3396,7 +3408,8 @@ ltadv_vtx_loop:
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andi laPacked, vGeomMid, G_PACKED_NORMALS >> 8
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vmadh vpWrlI, vMTX3I, vOne
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luv vpLtTot, (ltBufOfs + 0)(curLight) // Total light level, init to ambient
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vsub aOffsA, vpRGBA, $v31[7] // 0x7FFF; offset alpha
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// aOAFrs <- vpST
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vsub aOAFrs, vpRGBA, $v31[7] // 0x7FFF; offset alpha elems 3, 7
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vmudm $v29, aPNScl, vpMdl[3h] // Packed normals from elem 3,7 of model pos
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bnez laPacked, @@skip_regular_normals
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vmadn vpMdl, $v31, $v31[2] // 0; load lower (vpMdl unsigned but must be T operand)
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@@ -3404,7 +3417,7 @@ ltadv_vtx_loop:
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@@skip_regular_normals:
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vmudh $v29, vOne, $v31[7] // Load accum mid with 0x7FFF (1 in s.15)
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jal ltadv_xfrm
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vmadm aAOF2, aOffsA, aParam[0] // + (alpha - 1) * aoAmb factor; elems 3, 7
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vmadm aAOF2, aOAFrs, aParam[0] // + (alpha - 1) * aoAmb factor; elems 3, 7
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// aDOT <- vpMdl
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vmulf vpLtTot, vpLtTot, aAOF2[3h] // light color *= ambient factor
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// aLTC <- aAOF2
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@@ -3427,7 +3440,7 @@ ltadv_normals_to_regs:
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ltadv_loop:
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vmudh $v29, vOne, $v31[7] // Load accum mid with 0x7FFF (1 in s.15)
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lbu $11, (ltBufOfs + 3 - lightSize)(curLight) // Light type / constant attenuation
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vmadm aAOF, aOffsA, aParam[1] // + (alpha - 1) * aoDir factor; elems 3, 7
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vmadm aAOF, aOAFrs, aParam[1] // + (alpha - 1) * aoDir factor; elems 3, 7
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beq curLight, altBaseReg, ltadv_post
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lpv aDOT[0], (ltBufOfs + 8 - lightSize)(curLight) // Light or lookat 0 dir in elems 0-2
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bnez $11, ltadv_point
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@@ -3462,8 +3475,8 @@ ltadv_spec_fres_setup:
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j ltadv_normal_to_vertex
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ldv aDPosI[8], (cameraWorldPos - altBase)(altBaseReg)
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ltadv_after_camera:
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vmov aOffsA[0], aDOT[0] // Save Fresnel dot product in aOffsA[0h]
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vmov aOffsA[4], aDOT[4]
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vmov aOAFrs[0], aDOT[0] // Save Fresnel dot product in aOAFrs[0h]
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vmov aOAFrs[4], aDOT[4] // elems 0, 4
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bgez laSpecular, ltadv_loop // Sign bit clear = not specular
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li laSpecFres, 0 // Clear flag for specular or fresnel
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// aProj <- aLenF
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@@ -3501,26 +3514,35 @@ ltadv_post:
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beqz $11, @@skip_fresnel
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vmrg vpRGBA, aClOut, aAlOut // Merge base output and alpha output
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lsv aAOF[0], (vTRC_0100_addr - altBase)(altBaseReg) // Load constant 0x0100 to temp
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vabs aOffsA, aOffsA, aOffsA // Fresnel dot in aOffsA[0h]; absolute value for underwater
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vabs aOAFrs, aOAFrs, aOAFrs // Fresnel dot in aOAFrs[0h]; absolute value for underwater
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andi $11, vGeomMid, G_FRESNEL_COLOR >> 8
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vmudh $v29, vOne, aParam[7] // Fresnel offset
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vmacf aOffsA, aOffsA, aParam[6] // + factor * scale
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vmacf aOAFrs, aOAFrs, aParam[6] // + factor * scale
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beqz $11, @@skip
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vmudh aOffsA, aOffsA, aAOF[0] // Result * 0x0100, clamped to 0x7FFF
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vmudh aOAFrs, aOAFrs, aAOF[0] // Result * 0x0100, clamped to 0x7FFF
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veq $v29, $v31, $v31[3h] // Set VCC to 00010001 if G_FRESNEL_COLOR
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@@skip:
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vmrg vpRGBA, vpRGBA, aOffsA[0h] // Replace color or alpha with fresnel
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vmrg vpRGBA, vpRGBA, aOAFrs[0h] // Replace color or alpha with fresnel
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vge vpRGBA, vpRGBA, $v31[2] // Clamp to >= 0 for fresnel; doesn't affect others
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@@skip_fresnel:
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beqz laTexgen, @@skip_texgen // no texgen
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beqz laTexgen, ltadv_after_texgen
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suv vpRGBA, (VTX_IN_TC - 2 * inputVtxSize)(laPtr) // Vtx 2:1 RGBA
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// Texgen: aDOT still contains lookat 0 in elems 0-2, lookat 1 in elems 4-6
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nop // TODO
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@@skip_texgen:
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// Texgen: aDOT still contains lookat 0 in elems 0-2, lookat 1 in elems 4-6
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// vpST <- aOAFrs
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texgen_dots aDOT, aLkDt0, aLkDt1
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texgen_body aDOT, aLkDt0, aLkDt1, 0h, ltadv_texgen_end
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texgen_lastinstr aLkDt0, aLkDt1
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ltadv_texgen_end: // Vtx 2 ST in vpST elem 0, 1; vtx 1 ST in vpST elem 4, 5
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slv vpST[8], (tempVtx1ST)(rdpCmdBufEndP1) // Vtx 1 ST
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bltz laVtxLeft, ltadv_after_texgen // Only vtx 1 is valid, don't write vtx 2
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lw laSTKept, (tempVtx1ST)(rdpCmdBufEndP1) // Overwrite stored Vtx 1 ST
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slv vpST[0], (VTX_IN_TC - 1 * inputVtxSize)(laPtr) // Vtx 2 ST
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ltadv_after_texgen:
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// vpMdl <- aDOT
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lw $11, (VTX_IN_TC - 2 * inputVtxSize)(laPtr) // Vtx 2 RGBA from vtx 1 ST slot
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bltz laVtxLeft, vtx_setup_no_lighting
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sw laSTKept, (VTX_IN_TC - 2 * inputVtxSize)(laPtr) // Real vtx 1 ST
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sw laSTKept, (VTX_IN_TC - 2 * inputVtxSize)(laPtr) // Restore vtx 1 ST
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ltadv_vtx_loop_end:
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bgtz laVtxLeft, ltadv_vtx_loop
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sw $11, (VTX_IN_CN - 1 * inputVtxSize)(laPtr) // Real vtx 2 RGBA
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j vtx_setup_no_lighting
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@@ -3605,7 +3627,7 @@ ltadv_normalize: // Normalize vector in aDPosI:vpWrlF i/f
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vmadh aPLFcI, aLen2I, aNrmSc[7] // + len^2 int * quadratic factor int = aLen2I int
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// aAOF <- aLenF
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vmudh aAOF, vOne, $v31[7] // Load accum mid with 0x7FFF (1 in s.15)
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vmadm aAOF, aOffsA, aParam[2] // + (alpha - 1) * aoPoint factor; elems 3, 7
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vmadm aAOF, aOAFrs, aParam[2] // + (alpha - 1) * aoPoint factor; elems 3, 7
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// aDotSc <- aDIR
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vrcph aDotSc[1], aPLFcI[0] // 1/(2*light factor), input of 0000.8000 -> no change normals
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vrcpl aDotSc[2], aPLFcF[0] // Light factor 0001.0000 -> normals /= 2
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