diff --git a/.github/workflows/build_mac32.yml b/.github/workflows/build_mac32.yml
index e0193b199..38e3ffe6d 100644
--- a/.github/workflows/build_mac32.yml
+++ b/.github/workflows/build_mac32.yml
@@ -13,7 +13,7 @@ concurrency:
 
 jobs:
   build:
-    if: ${{ inputs.WEBHOOK_URL != '' }}
+    if: ${{ secrets.GHCR_ACCESS_KEY != '' }}
     runs-on: ubuntu-latest
     container:
       image: ghcr.io/classicube/minimal-osxcross:latest
diff --git a/misc/dreamcast/DrawColouredQuads.S b/misc/dreamcast/DrawColouredQuads.S
index a68f1127c..ba962a533 100644
--- a/misc/dreamcast/DrawColouredQuads.S
+++ b/misc/dreamcast/DrawColouredQuads.S
@@ -1,27 +1,3 @@
-!r0 = clip flags
-!r1 = GPU command
-!r2 = temp
-!r3 = prefetch address
-!r4 = src pointer ARG
-!r5 = dst pointer ARG
-!r6 = quads count ARG
-!r7 = ?
-
-!fr0  = temp
-!fr1  = u (0.0)
-!fr2  = v (0.0)
-!fr3  = c
-!fr4  = x
-!fr5  = y
-!fr6  = z
-!fr7  = w
-!fr8  = VIEWPORT_HWIDTH
-!fr9  = VIEWPORT_HHEIGHT
-!fr10 = VIEWPORT_X_PLUS_HWIDTH
-!fr11 = VIEWPORT_Y_PLUS_HHEIGHT
-
-!fv4  = XYZW
-
 #include "ViewportTransform.S"
 .global _DrawColouredQuads
 .align 4
@@ -90,4 +66,4 @@ _VP_COL_X_PLUS_HWIDTH:  .long 0
 
 .global _VP_COL_Y_PLUS_HHEIGHT
 .type   _VP_COL_Y_PLUS_HHEIGHT,%object
-_VP_COL_Y_PLUS_HHEIGHT: .long 0
\ No newline at end of file
+_VP_COL_Y_PLUS_HHEIGHT: .long 0
diff --git a/misc/dreamcast/DrawTexturedQuads.S b/misc/dreamcast/DrawTexturedQuads.S
index 9ef80f9fe..2771ac4ad 100644
--- a/misc/dreamcast/DrawTexturedQuads.S
+++ b/misc/dreamcast/DrawTexturedQuads.S
@@ -1,27 +1,3 @@
-!r0 = clip flags
-!r1 = GPU command
-!r2 = temp
-!r3 = prefetch address
-!r4 = src pointer ARG
-!r5 = dst pointer ARG
-!r6 = quads count ARG
-!r7 = ?
-
-!fr0  = temp
-!fr1  = u
-!fr2  = v
-!fr3  = c
-!fr4  = x
-!fr5  = y
-!fr6  = z
-!fr7  = w
-!fr8  = VIEWPORT_HWIDTH
-!fr9  = VIEWPORT_HHEIGHT
-!fr10 = VIEWPORT_X_PLUS_HWIDTH
-!fr11 = VIEWPORT_Y_PLUS_HHEIGHT
-
-!fv4  = XYZW
-
 #include "ViewportTransform.S"
 .global _DrawTexturedQuads
 .align 4
@@ -88,4 +64,4 @@ _VP_TEX_X_PLUS_HWIDTH:  .long 0
 
 .global _VP_TEX_Y_PLUS_HHEIGHT
 .type   _VP_TEX_Y_PLUS_HHEIGHT,%object
-_VP_TEX_Y_PLUS_HHEIGHT: .long 0
\ No newline at end of file
+_VP_TEX_Y_PLUS_HHEIGHT: .long 0
diff --git a/misc/dreamcast/ViewportTransform.S b/misc/dreamcast/ViewportTransform.S
index fee37ce0c..3ceb5bdb1 100644
--- a/misc/dreamcast/ViewportTransform.S
+++ b/misc/dreamcast/ViewportTransform.S
@@ -1,108 +1,170 @@
+! =========================================================
+! ======================== PROCESSOR INFO =================
+! =========================================================
+! The SH4 can dual issue (i.e. parallel execution) instructions
+! as long as the groups of the two instructions are different:
+! * LS - most APU and FPU register load/stores
+! * EX - most APU arithmetic instructions
+! * MT - TST, CMP, NOP, MOV Rm,Rn
+! * FE - most FPU arithmetic instructions
+! * CO - other instructions
+
+! Thee following general aspects of instructions are important to note per the SH4 manual:
+! * Issue rate: Interval between the issue of an instruction and that of the next instruction
+! * Latency: Interval between the issue of an instruction and the generation of its result (completion)
+! * Latency is also the interval between the execution of two instructions with an interdependent relationship.
+!   (although different cases may either increase or decrease Latency)
+! 
+! The instructions have the following latencies
+! * FADD.S/FMUL.S/FSUB.S/FMAC.S - 3/4
+! * FTRV - 5/8
+! * SHL/SHR - 1
+! * ADD/SUB/OR/XOR - 1
+
+
+! =========================================================
+! ======================== REGISTER USAGES ================
+! =========================================================
+! SH4 C ABI:
+! -  R0  to  R3 are return values (can be overwritten)
+! -  R4  to  R7 are input arguments (can be overwritten)
+! -  R8  to R13 are non-volatile (must be restored at end)
+! - R14  is the frame pointer (must be restored at end)
+! - R15  is the stack pointer (must be restored at end)
+! - FR0  to FR3 are return values (can be overwritten)
+! - FR4  to FR11 are input arguments (can be overwritten)
+! - FR12 to FR13 are non-volatile (must be restored at end)
+
+!r0 = clip flags
+!r1 = GPU command
+!r2 = temp
+!r3 = prefetch address
+!r4 = src pointer ARG
+!r5 = dst pointer ARG
+!r6 = quads count ARG
+!r7 = ?
+
+!fr0  = temp
+!fr1  = u
+!fr2  = v
+!fr3  = c
+!fr4  = x
+!fr5  = y
+!fr6  = z
+!fr7  = w
+!fr8  = VIEWPORT_HWIDTH
+!fr9  = VIEWPORT_HHEIGHT
+!fr10 = VIEWPORT_X_PLUS_HWIDTH
+!fr11 = VIEWPORT_Y_PLUS_HHEIGHT
+
+!fv4  = XYZW
+
+
 ! =========================================================
 ! ========================= VERTEX LOADING ================
 ! =========================================================
 .macro LoadColouredVertex
 ! PREPARE NEXT VERTEX
-    add #16, r3     ! r3 += VERTEX_STRIDE
-    pref @r3        ! PREFETCH r3 (next vertex)
-    add #64, r5     ! r5 += 2 * sizeof(VERTEX)
+    add #16, r3      ! EX, r3 += VERTEX_STRIDE
+    pref @r3         ! LS, PREFETCH r3 (next vertex)
+    add #64, r5      ! EX, r5 += 2 * sizeof(VERTEX)
 ! LOAD XYZ
-    fmov @r4+, fr4  ! X = src->x
-    fmov @r4+, fr5  ! Y = src->y
-    fmov @r4+, fr6  ! Z = src->z
-    fldi1 fr7       ! W = 1.0
+    fmov @r4+, fr4   ! LS, X = src->x
+    fmov @r4+, fr5   ! LS, Y = src->y
+    fmov @r4+, fr6   ! LS, Z = src->z
+    fldi1 fr7        ! LS, W = 1.0
 ! TRANSFORM VERTEX
-    ftrv xmtrx, fv4 ! TRANSFORM(XYZW)
+    ftrv xmtrx, fv4  ! FE, TRANSFORM(XYZW)
 ! LOAD ATTRIBUTES
-    fmov   @r4+,fr3 ! C = src->color
+    fmov   @r4+,fr3  ! LS, C = src->color
 .endm
 
 .macro LoadTexturedVertex
 ! PREPARE NEXT VERTEX
-    add #24, r3     ! r3 += VERTEX_STRIDE
-    pref @r3        ! PREFETCH r3 (next vertex)
-    add #64, r5     ! r5 += 2 * sizeof(VERTEX)
+    add #24, r3      ! EX, r3 += VERTEX_STRIDE
+    pref @r3         ! LS, PREFETCH r3 (next vertex)
+    add #64, r5      ! EX, r5 += 2 * sizeof(VERTEX)
 ! LOAD XYZ
-    fmov @r4+, fr4  ! X = src->x
-    fmov @r4+, fr5  ! Y = src->y
-    fmov @r4+, fr6  ! Z = src->z
-    fldi1 fr7       ! W = 1.0
+    fmov @r4+, fr4   ! LS, X = src->x
+    fmov @r4+, fr5   ! LS, Y = src->y
+    fmov @r4+, fr6   ! LS, Z = src->z
+    fldi1 fr7        ! LS, W = 1.0
 ! TRANSFORM VERTEX
-    ftrv xmtrx, fv4 ! TRANSFORM(XYZW)
+    ftrv xmtrx, fv4  ! FE, TRANSFORM(XYZW)
 ! LOAD ATTRIBUTES
-    fmov    @r4+,fr3 ! C = src->color
-    fmov    @r4+,fr1 ! U = src->u
-    fmov    @r4+,fr2 ! V = src->v
+    fmov    @r4+,fr3 ! LS, C = src->color
+    fmov    @r4+,fr1 ! LS, U = src->u
+    fmov    @r4+,fr2 ! LS, V = src->v
 .endm
 
 ! =========================================================
 ! ========================= VERTEX OUTPUT =================
 ! =========================================================
-! To take advantage of SH4 dual instruction processing, interleave
-!  the clipflag calculation and vertex output instructions
+! To take advantage of SH4 dual instruction processing, 
+!  clipflag calculation and vertex output are interleaved
 .macro ProcessVertex1
-    fmov.s  fr7,@-r5 ! dst->w = W
-    fmov.s  fr3,@-r5 ! dst->c = C
-    fneg    fr7      ! W = -W
-    fmov.s  fr2,@-r5 ! dst->v = V
-    fcmp/gt fr7,fr6  ! T = Z > W (i.e. Z > -W)
-    fmov.s  fr1,@-r5 ! dst->u = U
-    movt    r0       ! CLIPFLAGS = T
-    fmov.s  fr6,@-r5 ! dst->z = Z
-    fmov.s  fr5,@-r5 ! dst->y = Y
-    fmov.s  fr4,@-r5 ! dst->x = X
-    mov.l   r1,@-r5  ! dst->flags = CMD_VERT
+    fmov.s  fr7,@-r5 ! LS, dst->w = W
+    fmov.s  fr3,@-r5 ! LS, dst->c = C
+    fneg    fr7      ! LS, W = -W
+    fmov.s  fr2,@-r5 ! LS, dst->v = V
+    fcmp/gt fr7,fr6  ! CO, T = Z > W (i.e. Z > -W)
+    fmov.s  fr1,@-r5 ! LS, dst->u = U
+    movt    r0       ! EX, CLIPFLAGS = T
+    fmov.s  fr6,@-r5 ! LS, dst->z = Z
+    fmov.s  fr5,@-r5 ! LS, dst->y = Y
+    fmov.s  fr4,@-r5 ! LS, dst->x = X
+    mov.l   r1,@-r5  ! LS, dst->flags = CMD_VERT
 .endm
 
 .macro ProcessVertex2
-    fmov.s  fr7,@-r5 ! dst->w = W
-    fmov.s  fr3,@-r5 ! dst->c = C
-    fneg    fr7      ! W = -W
-    fmov.s  fr2,@-r5 ! dst->v = V
-    fcmp/gt fr7,fr6  ! T = Z > W (i.e. Z > -W)
-    fmov.s  fr1,@-r5 ! dst->u = U
-    movt    r2       ! tmp = T
-    fmov.s  fr6,@-r5 ! dst->z = Z
-    add     r2,r2    ! tmp = tmp + tmp
-    fmov.s  fr5,@-r5 ! dst->y = Y
-    or      r2,r0    ! CLIPFLAGS |= tmp (T << 1)
-    fmov.s  fr4,@-r5 ! dst->x = X
-    mov.l   r1,@-r5  ! dst->flags = CMD_VERT
+    fmov.s  fr7,@-r5 ! LS, dst->w = W
+    fmov.s  fr3,@-r5 ! LS, dst->c = C
+    fneg    fr7      ! LS, W = -W
+    fmov.s  fr2,@-r5 ! LS, dst->v = V
+    fcmp/gt fr7,fr6  ! CO, T = Z > W (i.e. Z > -W)
+    fmov.s  fr1,@-r5 ! LS, dst->u = U
+    movt    r2       ! EX, tmp = T
+    fmov.s  fr6,@-r5 ! LS, dst->z = Z
+    add     r2,r2    ! EX, tmp = tmp + tmp
+    fmov.s  fr5,@-r5 ! LS, dst->y = Y
+    or      r2,r0    ! EX, CLIPFLAGS |= tmp (T << 1)
+    fmov.s  fr4,@-r5 ! LS, dst->x = X
+    mov.l   r1,@-r5  ! LS, dst->flags = CMD_VERT
 .endm
 
 .macro ProcessVertex3
-    fmov.s  fr7,@-r5 ! dst->w = W
-    fmov.s  fr3,@-r5 ! dst->c = C
-    fneg    fr7      ! W = -W
-    fmov.s  fr2,@-r5 ! dst->v = V
-    fcmp/gt fr7,fr6  ! T = Z > W (i.e. Z > -W)
-    fmov.s  fr1,@-r5 ! dst->u = U
-    movt    r2       ! tmp = T
-    fmov.s  fr6,@-r5 ! dst->z = Z
-    fmov.s  fr5,@-r5 ! dst->y = Y
-    shll2   r2       ! tmp = tmp << 2
-    fmov.s  fr4,@-r5 ! dst->x = X
-    or      r2,r0    ! CLIPFLAGS |= tmp (T << 2)
-    mov.l   r1,@-r5  ! dst->flags = CMD_VERT
+    fmov.s  fr7,@-r5 ! LS, dst->w = W
+    fmov.s  fr3,@-r5 ! LS, dst->c = C
+    fneg    fr7      ! LS, W = -W
+    fmov.s  fr2,@-r5 ! LS, dst->v = V
+    fcmp/gt fr7,fr6  ! CO, T = Z > W (i.e. Z > -W)
+    fmov.s  fr1,@-r5 ! LS, dst->u = U
+    movt    r2       ! EX, tmp = T
+    fmov.s  fr6,@-r5 ! LS, dst->z = Z
+    fmov.s  fr5,@-r5 ! LS, dst->y = Y
+    shll2   r2       ! EX, tmp = tmp << 2
+    fmov.s  fr4,@-r5 ! LS, dst->x = X
+    or      r2,r0    ! EX, CLIPFLAGS |= tmp (T << 2)
+    mov.l   r1,@-r5  ! LS, dst->flags = CMD_VERT
 .endm
 
 .macro ProcessVertex4 eos_addr
-    fmov.s  fr7,@-r5 ! dst->w = W
-    fmov.s  fr3,@-r5 ! dst->c = C
-    fneg    fr7      ! W = -W
-    fmov.s  fr2,@-r5 ! dst->v = V
-    fcmp/gt fr7,fr6  ! T = Z > W (i.e. Z > -W)
-    fmov.s  fr1,@-r5 ! dst->u = U
-    movt    r2       ! tmp = T
-    fmov.s  fr6,@-r5 ! dst->z = Z
-    shll2   r2       ! tmp = tmp << 2
-    fmov.s  fr5,@-r5 ! dst->y = Y
-    add     r2,r2    ! tmp = (tmp << 2) + (tmp << 2)
-    fmov.s  fr4,@-r5 ! dst->x = X
-    mov.l \eos_addr, r1 ! r1  = GPU EOS command
-    or      r2,r0    ! CLIPFLAGS |= tmp (T << 3)
-    or      r0,r1    ! r1 |= CLIPFLAGS
-    mov.l   r1,@-r5  ! dst->flags = GPU EOS | CLIPFLAGS
+    fmov.s  fr7,@-r5 ! LS, dst->w = W
+    fmov.s  fr3,@-r5 ! LS, dst->c = C
+    fneg    fr7      ! LS, W = -W
+    fmov.s  fr2,@-r5 ! LS, dst->v = V
+    fcmp/gt fr7,fr6  ! CO, T = Z > W (i.e. Z > -W)
+    fmov.s  fr1,@-r5 ! LS, dst->u = U
+    movt    r2       ! EX, tmp = T
+    fmov.s  fr6,@-r5 ! LS, dst->z = Z
+    shll2   r2       ! EX, tmp = tmp << 2
+    fmov.s  fr5,@-r5 ! LS, dst->y = Y
+    add     r2,r2    ! EX, tmp = (tmp << 2) + (tmp << 2)
+    fmov.s  fr4,@-r5 ! LS, dst->x = X
+    mov.l \eos_addr, r1 ! LS, r1  = GPU EOS command
+    or      r2,r0    ! EX, CLIPFLAGS |= tmp (T << 3)
+    or      r0,r1    ! EX, r1 |= CLIPFLAGS
+    mov.l   r1,@-r5  ! LS, dst->flags = GPU EOS | CLIPFLAGS
 .endm
 
 
@@ -123,39 +185,39 @@
 !fr11 = VIEWPORT_Y_PLUS_HHEIGHT
 
 .macro ViewportTransformSetup viewport_addr
-    mova \viewport_addr, r0
-    fmov.s	@r0+,fr8  ! fr8  = VIEWPORT_HWIDTH
-    fmov.s	@r0+,fr9  ! fr9  = VIEWPORT_HHEIGHT
-    fmov.s	@r0+,fr10 ! fr10 = VIEWPORT_X_PLUS_HWIDTH
-    fmov.s	@r0+,fr11 ! fr11 = VIEWPORT_Y_PLUS_HHEIGHT
-    nop               ! align to even instructions
+    mova \viewport_addr, r0 ! EX, r0 = &VIEWPORT
+    fmov.s	@r0+,fr8  ! LS, fr8  = VIEWPORT_HWIDTH
+    fmov.s	@r0+,fr9  ! LS, fr9  = VIEWPORT_HHEIGHT
+    fmov.s	@r0+,fr10 ! LS, fr10 = VIEWPORT_X_PLUS_HWIDTH
+    fmov.s	@r0+,fr11 ! LS, fr11 = VIEWPORT_Y_PLUS_HHEIGHT
+    nop               ! MT, align to even instructions
 .endm
 
 .macro ViewportTransformVertex
 ! INVERSE W CALCULATION
-    add #28, r5       ! r5  = &vertex->w
-    fmov.s  @r5,fr0   ! fr0 = vertex->w
-    fmul    fr0,fr0   ! fr0 = fr0 * fr0
-    add #-24, r5      ! r5  = &vertex->x
-    fsrra   fr0       ! fr0 = 1 / sqrt(fr0) -> 1 / vertex->w
+    add #28, r5       ! EX, r5  = &vertex->w
+    fmov.s  @r5,fr0   ! LS, fr0 = vertex->w
+    fmul    fr0,fr0   ! FE, fr0 = fr0 * fr0
+    add #-24, r5      ! EX, r5  = &vertex->x
+    fsrra   fr0       ! FE, fr0 = 1 / sqrt(fr0) -> 1 / vertex->w
 
 ! TRANSFORM X
-    fmov.s @r5,fr4    ! fr4 = vertex->x
-    fmov  fr10,fr5    ! fr5 = VIEWPORT_X_PLUS_HWIDTH
-    fmul  fr8,fr4     ! fr4 = VIEWPORT_HWIDTH * vertex->x
-    fmac  fr0,fr4,fr5 ! fr5 = fr0 * fr4 + fr5 -- (X * F * hwidth) + x_plus_hwidth
-    fmov.s fr5,@r5    ! vertex->x = fr5
-    add #4, r5        ! r5  = &vertex->y
+    fmov.s @r5,fr4    ! LS, fr4 = vertex->x
+    fmov  fr10,fr5    ! LS, fr5 = VIEWPORT_X_PLUS_HWIDTH
+    fmul  fr8,fr4     ! FE, fr4 = VIEWPORT_HWIDTH * vertex->x
+    fmac  fr0,fr4,fr5 ! FE, fr5 = fr0 * fr4 + fr5 -- (X * F * hwidth) + x_plus_hwidth
+    fmov.s fr5,@r5    ! LS, vertex->x = fr5
+    add #4, r5        ! EX, r5  = &vertex->y
 
 ! TRANSFORM Y
-    fmov.s @r5,fr4    ! fr4 = vertex->y
-    fmov  fr11,fr5    ! fr5  = VIEWPORT_Y_PLUS_HHEIGHT
-    fmul  fr9,fr4     ! fr4  = VIEWPORT_HHEIGHT * vertex->y
-    fmac  fr0,fr4,fr5 ! fr5  = fr0 * fr4 + fr5 -- (Y * F * hheight) + y_plus_hheight
-    fmov.s fr5,@r5    ! vertex->y = fr5
-    add #4, r5        ! r5  = &vertex->z
+    fmov.s @r5,fr4    ! LS, fr4 = vertex->y
+    fmov  fr11,fr5    ! LS, fr5  = VIEWPORT_Y_PLUS_HHEIGHT
+    fmul  fr9,fr4     ! FE, fr4  = VIEWPORT_HHEIGHT * vertex->y
+    fmac  fr0,fr4,fr5 ! FE, fr5  = fr0 * fr4 + fr5 -- (Y * F * hheight) + y_plus_hheight
+    fmov.s fr5,@r5    ! LS, vertex->y = fr5
+    add #4, r5        ! EX, r5  = &vertex->z
 
 ! ASSIGN Z
-    fmov.s fr0,@r5    ! vertex->z = fr0
-    add #20, r5       ! r5 += 20 (points to start of next vertex)
-.endm
\ No newline at end of file
+    fmov.s fr0,@r5    ! LS, vertex->z = fr0
+    add #20, r5       ! EX, r5 += 20 (points to start of next vertex)
+.endm