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Slightly simplify ST calculation

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UnknownShadow200 2025-04-30 20:54:35 +10:00
parent 3dc7b93eff
commit 34474b32aa
2 changed files with 20 additions and 24 deletions
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1
misc/n64/gl_constants.h
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@ -43,4 +43,5 @@
#define PRIM_VTX_TRCODE 40 // trivial-reject clipping flags (against -w/+w)
#define PRIM_VTX_SIZE 42
#endif

43
misc/n64/rsp_gpu.S
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@ -137,7 +137,7 @@ GPUCmd_UploadVertex:
addi vtx, %lo(VERTEX_CACHE)
sdv vpos, PRIM_VTX_X ,vtx
sdv vcol, PRIM_VTX_R ,vtx
sdv vtex, PRIM_VTX_TEX_S ,vtx
slv vtex, PRIM_VTX_TEX_S ,vtx
# == matrix multiply ==
li mtx_ptr, %lo(GL_MATRIX_MVP)
@ -343,41 +343,36 @@ GL_TnL:
#define vtexsize $v06
#define vtexoffset $v07
#define vstrq $v08
#define vst $v08
ldv vstrq, PRIM_VTX_TEX_S,vtx # S + T + R + Q
llv vst, PRIM_VTX_TEX_S,vtx # S + T
suv vrgba, SCREEN_VTX_RGBA,vtx
li s1, %lo(GL_STATE_TEX_SIZE)
llv vtexsize.s, 0,s1
llv vtexoffset.s, 4,s1
#define vinvq_i $v26
#define vinvq_f $v27
#define vstrq_i $v28
#define vstrq_f $v29
#define q e3
#define vst_i $v28
#define vst_f $v29
# Scale texcoord by texsize and subtract offset (to correct for bilinear sampling if active)
#vmudn v___, vstrq, vtexsize
# vmadh vstrq, vtexoffset, K1
#vmudn v___, vst, vtexsize
# vmadh vst, vtexoffset, K1
#vmudn v___, vstrq, vtexsize
#vmadh vstrq, vtexoffset, K1
#vmudl vstrq, vstrq, vtexsize
#vmudn v___, vst, vtexsize
#vmadh vst, vtexoffset, K1
#vmudl vst, vst, vtexsize
vmudh v___, vstrq, vtexsize
vsar vstrq_i, COP2_ACC_HI
vsar vstrq_f, COP2_ACC_MD
vmudh v___, vst, vtexsize
vsar vst_i, COP2_ACC_HI
vsar vst_f, COP2_ACC_MD
vmudl vstrq_f, vstrq_f, K8192
vmadm vstrq_i, vstrq_i, K8192
vmadn vstrq, vzero, vzero
vmudl vst_f, vst_f, K8192
vmadm vst_i, vst_i, K8192
vmadn vst, vzero, vzero
#undef vinvq_i
#undef vinvq_f
#undef vstrq_i
#undef vstrq_f
#undef vst_i
#undef vst_f
#undef q
lbu t0, PRIM_VTX_TRCODE(vtx)
@ -393,7 +388,7 @@ GL_TnL:
sb t0, PRIM_VTX_TRCODE(vtx)
jal GL_CalcScreenSpace
slv vstrq.s, SCREEN_VTX_S,vtx
slv vst.s, SCREEN_VTX_S,vtx
j GL_CalcClipCodes
move ra, ra2