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PS2: Minorly tidy up assembly

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UnknownShadow200 2025-05-04 08:10:33 +10:00
parent 8b36940221
commit 1e414ac871
1 changed files with 23 additions and 40 deletions
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63
misc/ps2/VertexTransform.S
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@ -9,57 +9,44 @@
# vf7 = viewport scale
# NOTE: vclipw.xyz takes 4 cycles to produce result, which must be accounted for
.macro FUNC name
.global \name
.type \name,%function
\name:
.endm
# mips ISA has explicit delay slots
# (i.e. instruction after branches/jumps are always unconditionally executed)
.set noreorder
.align 4
.global LoadMvpMatrix
.type LoadMvpMatrix,%function
.global LoadClipScaleFactors
.type LoadClipScaleFactors,%function
.global LoadViewportOrigin
.type LoadViewportOrigin,%function
.global LoadViewportScale
.type LoadViewportScale,%function
.global TransformTexturedQuad
.type TransformTexturedQuad,%function
.global TransformColouredQuad
.type TransformColouredQuad,%function
.global ViewportTransform
.type ViewportTransform,%function
# Loads matrix into VU0 registers
# $a0 = addresss of mvp
LoadMvpMatrix:
FUNC LoadMvpMatrix
lqc2 $vf1, 0x00($a0) # vf1 = mvp.row1
lqc2 $vf2, 0x10($a0) # vf2 = mvp.row2
lqc2 $vf3, 0x20($a0) # vf3 = mvp.row3
lqc2 $vf4, 0x30($a0) # vf4 = mvp.row4
jr $ra
nop
lqc2 $vf4, 0x30($a0) # vf4 = mvp.row4
# Loads clipping scaling factors into VU0 registers
# $a0 = addresss of factors
LoadClipScaleFactors:
FUNC LoadClipScaleFactors
lqc2 $vf5, 0x00($a0) # vf5 = factors
jr $ra
nop
# Loads viewport origin into VU0 registers
# $a0 = addresss of origin
LoadViewportOrigin:
lqc2 $vf6, 0x00($a0) # vf6 = origin
FUNC LoadViewportOrigin
jr $ra
nop
lqc2 $vf6, 0x00($a0) # vf6 = origin
# Loads viewport scale into VU0 registers
# $a0 = addresss of scale
LoadViewportScale:
lqc2 $vf7, 0x00($a0) # vf7 = scale
FUNC LoadViewportScale
jr $ra
nop
lqc2 $vf7, 0x00($a0) # vf7 = scale
.macro TransformVertex1
@ -141,6 +128,7 @@ LoadViewportScale:
# STORE CLIP FLAGS 4 RESULT
cfc2 $t0, $18 # t0 = VP0_REGS[CLIP_FLAGS]
jr $ra
sw $t0,0x0C($a3) # clip_flags[3] = t0
.endm
@ -150,7 +138,7 @@ LoadViewportScale:
# $a1 = addresss of dst vertices
# $a2 = address of tmp vertex
# $a3 = address of clip flags
TransformTexturedQuad:
FUNC TransformTexturedQuad
# LOAD 1.0 into W
lw $t0,ONE_VALUE # t0 = 1.0f
sw $t0,0x0C($a2) # tmp.w = f5
@ -184,15 +172,13 @@ TransformTexturedQuad:
TransformVertex4
TransformFinish
jr $ra
nop
# Transforms 4 vertices with size of 16 bytes
# $a0 = addresss of src vertices
# $a1 = addresss of dst vertices
# $a2 = address of tmp vertex
# $a3 = address of clip flags
TransformColouredQuad:
FUNC TransformColouredQuad
# LOAD 1.0 into W
lw $t0,ONE_VALUE # t0 = 1.0f
sw $t0,0x0C($a2) # tmp.w = f5
@ -226,8 +212,6 @@ TransformColouredQuad:
TransformVertex4
TransformFinish
jr $ra
nop
.global ONE_VALUE
ONE_VALUE: .float 1.0
@ -235,12 +219,11 @@ ONE_VALUE: .float 1.0
# $a0 = addresss of src
# $a1 = addresss of dst
ViewportTransform:
FUNC ViewportTransform
lqc2 $vf16, 0x00($a0) # IN = src
vmulw $vf17, $vf16, $vf16 # TMP = IN[xyzw] * IN.w (inverse W)
vmul $vf18, $vf17, $vf7 # TMP = TMP * viewport_scale
vadd $vf19, $vf18, $vf6 # TMP = TMP + viewport_origin
vftoi0 $vf19, $vf19 # TMP = int(TMP)
sqc2 $vf19, 0x00($a1) # dst = TMP
jr $ra
nop
sqc2 $vf19, 0x00($a1) # dst = TMP