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Code Issues Releases Wiki Activity

#368 micro optimizations, some code cleanup

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This commit is contained in:
XProger
2022-02-13 14:10:02 +03:00
parent ae63f1c090
commit 6656837473
7 changed files with 125 additions and 129 deletions
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44
src/platform/gba/asm/faceAddMeshQuads.s
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@@ -59,26 +59,25 @@ faceAddMeshQuads_asm:
CCW .skip CCW .skip
// fetch ((clip << 8) | g) // fetch clip flags
ldrh vg0, [vp0, #VERTEX_G] ldrb vg0, [vp0, #VERTEX_CLIP]
ldrh vg1, [vp1, #VERTEX_G] ldrb vg1, [vp1, #VERTEX_CLIP]
ldrh vg2, [vp2, #VERTEX_G] ldrb vg2, [vp2, #VERTEX_CLIP]
ldrh vg3, [vp3, #VERTEX_G] ldrb vg3, [vp3, #VERTEX_CLIP]
// check clipping // check clipping
and tmp, vg0, vg1 and tmp, vg0, vg1
and tmp, tmp, vg2 and tmp, vg2
and tmp, tmp, vg3 ands tmp, vg3
tst tmp, #CLIP_MASK
bne .skip bne .skip
// mark if should be clipped by viewport // mark if should be clipped by viewport
orr tmp, vg0, vg1 orr tmp, vg0, vg1
orr tmp, tmp, vg2 orr tmp, vg2
orr tmp, tmp, vg3 orr tmp, vg3
tst tmp, #CLIP_MASK_VP tst tmp, #(CLIP_MASK_VP >> 8)
ldrh flags, [polys, #-8] ldrh flags, [polys, #-8]
orrne flags, flags, #FACE_CLIPPED orrne flags, #FACE_CLIPPED
// vz0 = AVG_Z4 (depth) // vz0 = AVG_Z4 (depth)
ldrh vz0, [vp0, #VERTEX_Z] ldrh vz0, [vp0, #VERTEX_Z]
@@ -86,28 +85,27 @@ faceAddMeshQuads_asm:
ldrh vz2, [vp2, #VERTEX_Z] ldrh vz2, [vp2, #VERTEX_Z]
ldrh vz3, [vp3, #VERTEX_Z] ldrh vz3, [vp3, #VERTEX_Z]
add depth, vz0, vz1 add depth, vz0, vz1
add depth, depth, vz2 add depth, vz2
add depth, depth, vz3 add depth, vz3
mov depth, depth, lsr #(2 + OT_SHIFT) lsr depth, #(2 + OT_SHIFT)
// faceAdd // faceAdd
ldr vertices, =gVertices ldr vertices, =gVertices
sub vp0, vertices
sub vp1, vertices
sub vp2, vertices
sub vp3, vertices
sub vp0, vp0, vertices lsr vp0, #3
sub vp1, vp1, vertices
sub vp2, vp2, vertices
sub vp3, vp3, vertices
mov vp0, vp0, lsr #3
orr vp1, vp0, vp1, lsl #(16 - 3) orr vp1, vp0, vp1, lsl #(16 - 3)
mov vp2, vp2, lsr #3 lsr vp2, #3
orr vp3, vp2, vp3, lsl #(16 - 3) orr vp3, vp2, vp3, lsl #(16 - 3)
ldr next, [ot, depth, lsl #2] ldr next, [ot, depth, lsl #2]
str face, [ot, depth, lsl #2] str face, [ot, depth, lsl #2]
stmia face!, {flags, next, vp1, vp3} stmia face!, {flags, next, vp1, vp3}
.skip: .skip:
subs count, count, #1 subs count, #1
bne .loop bne .loop
ldr tmp, =gFacesBase ldr tmp, =gFacesBase

33
src/platform/gba/asm/faceAddMeshTriangles.s
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@@ -56,40 +56,39 @@ faceAddMeshTriangles_asm:
CCW .skip CCW .skip
// fetch ((clip << 8) | g) // fetch clip flags
ldrh vg0, [vp0, #VERTEX_G] ldrb vg0, [vp0, #VERTEX_CLIP]
ldrh vg1, [vp1, #VERTEX_G] ldrb vg1, [vp1, #VERTEX_CLIP]
ldrh vg2, [vp2, #VERTEX_G] ldrb vg2, [vp2, #VERTEX_CLIP]
// check clipping // check clipping
and tmp, vg0, vg1 and tmp, vg0, vg1
and tmp, tmp, vg2 ands tmp, vg2
tst tmp, #CLIP_MASK
bne .skip bne .skip
// mark if should be clipped by viewport // mark if should be clipped by viewport
orr tmp, vg0, vg1 orr tmp, vg0, vg1
orr tmp, tmp, vg2 orr tmp, vg2
tst tmp, #CLIP_MASK_VP tst tmp, #(CLIP_MASK_VP >> 8)
ldrh flags, [polys, #-8] ldrh flags, [polys, #-8]
orrne flags, flags, #FACE_CLIPPED orrne flags, #FACE_CLIPPED
// vz0 = AVG_Z3 (depth) // vz0 = AVG_Z3 (depth)
ldrh vz0, [vp0, #VERTEX_Z] ldrh vz0, [vp0, #VERTEX_Z]
ldrh vz1, [vp1, #VERTEX_Z] ldrh vz1, [vp1, #VERTEX_Z]
ldrh vz2, [vp2, #VERTEX_Z] ldrh vz2, [vp2, #VERTEX_Z]
add depth, vz0, vz1 add depth, vz0, vz1
add depth, depth, vz2, lsl #1 add depth, vz2, lsl #1
mov depth, depth, lsr #(2 + OT_SHIFT) lsr depth, #(2 + OT_SHIFT)
// faceAdd // faceAdd
sub vp0, vp0, vertices sub vp0, vertices
sub vp1, vp1, vertices sub vp1, vertices
sub vp2, vp2, vertices sub vp2, vertices
mov vp0, vp0, lsr #3 lsr vp0, #3
orr vp1, vp0, vp1, lsl #(16 - 3) orr vp1, vp0, vp1, lsl #(16 - 3)
mov vp2, vp2, lsr #3 lsr vp2, #3
orr flags, #FACE_TRIANGLE orr flags, #FACE_TRIANGLE
@@ -97,7 +96,7 @@ faceAddMeshTriangles_asm:
str face, [ot, depth, lsl #2] str face, [ot, depth, lsl #2]
stmia face!, {flags, next, vp1, vp2} stmia face!, {flags, next, vp1, vp2}
.skip: .skip:
subs count, count, #1 subs count, #1
bne .loop bne .loop
ldr tmp, =gFacesBase ldr tmp, =gFacesBase

31
src/platform/gba/asm/faceAddRoomQuads.s
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@@ -65,25 +65,25 @@ faceAddRoomQuads_asm:
// check clipping // check clipping
and tmp, vg0, vg1 and tmp, vg0, vg1
and tmp, tmp, vg2 and tmp, vg2
and tmp, tmp, vg3 and tmp, vg3
tst tmp, #CLIP_MASK tst tmp, #CLIP_MASK
bne .skip bne .skip
// mark if should be clipped by viewport // mark if should be clipped by viewport
orr tmp, vg0, vg1 orr tmp, vg0, vg1
orr tmp, tmp, vg2 orr tmp, vg2
orr tmp, tmp, vg3 orr tmp, vg3
tst tmp, #CLIP_MASK_VP tst tmp, #CLIP_MASK_VP
ldrh flags, [polys, #-12] ldrh flags, [polys, #-12]
orrne flags, flags, #FACE_CLIPPED orrne flags, #FACE_CLIPPED
// shift and compare VERTEX_G for flat rasterization // shift and compare VERTEX_G for gouraud rasterization
mov vg0, vg0, lsl #24 lsl vg0, #24
cmp vg0, vg1, lsl #24 cmp vg0, vg1, lsl #24
cmpeq vg0, vg2, lsl #24 cmpeq vg0, vg2, lsl #24
cmpeq vg0, vg3, lsl #24 cmpeq vg0, vg3, lsl #24
addne flags, flags, #FACE_GOURAUD addne flags, #FACE_GOURAUD
CCW .skip CCW .skip
@@ -102,22 +102,21 @@ faceAddRoomQuads_asm:
// faceAdd // faceAdd
ldr vertices, =gVertices ldr vertices, =gVertices
sub vp0, vertices
sub vp1, vertices
sub vp2, vertices
sub vp3, vertices
sub vp0, vp0, vertices lsr vp0, #3
sub vp1, vp1, vertices
sub vp2, vp2, vertices
sub vp3, vp3, vertices
mov vp0, vp0, lsr #3
orr vp1, vp0, vp1, lsl #(16 - 3) orr vp1, vp0, vp1, lsl #(16 - 3)
mov vp2, vp2, lsr #3 lsr vp2, #3
orr vp3, vp2, vp3, lsl #(16 - 3) orr vp3, vp2, vp3, lsl #(16 - 3)
ldr next, [ot, depth, lsl #2] ldr next, [ot, depth, lsl #2]
str face, [ot, depth, lsl #2] str face, [ot, depth, lsl #2]
stmia face!, {flags, next, vp1, vp3} stmia face!, {flags, next, vp1, vp3}
.skip: .skip:
subs count, count, #1 subs count, #1
bne .loop bne .loop
ldr tmp, =gFacesBase ldr tmp, =gFacesBase

24
src/platform/gba/asm/faceAddRoomTriangles.s
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@@ -61,22 +61,22 @@ faceAddRoomTriangles_asm:
// check clipping // check clipping
and tmp, vg0, vg1 and tmp, vg0, vg1
and tmp, tmp, vg2 and tmp, vg2
tst tmp, #CLIP_MASK tst tmp, #CLIP_MASK
bne .skip bne .skip
// mark if should be clipped by viewport // mark if should be clipped by viewport
orr tmp, vg0, vg1 orr tmp, vg0, vg1
orr tmp, tmp, vg2 orr tmp, vg2
tst tmp, #CLIP_MASK_VP tst tmp, #CLIP_MASK_VP
ldrh flags, [polys, #-10] ldrh flags, [polys, #-10]
orrne flags, flags, #FACE_CLIPPED orrne flags, #FACE_CLIPPED
// shift and compare VERTEX_G for flat rasterization // shift and compare VERTEX_G for gouraud rasterization
mov vg0, vg0, lsl #24 lsl vg0, #24
cmp vg0, vg1, lsl #24 cmp vg0, vg1, lsl #24
cmpeq vg0, vg2, lsl #24 cmpeq vg0, vg2, lsl #24
addne flags, flags, #FACE_GOURAUD addne flags, #FACE_GOURAUD
CCW .skip CCW .skip
@@ -91,13 +91,13 @@ faceAddRoomTriangles_asm:
mov depth, vz0, lsr #OT_SHIFT mov depth, vz0, lsr #OT_SHIFT
// faceAdd // faceAdd
sub vp0, vp0, vertices sub vp0, vertices
sub vp1, vp1, vertices sub vp1, vertices
sub vp2, vp2, vertices sub vp2, vertices
mov vp0, vp0, lsr #3 lsr vp0, #3
orr vp1, vp0, vp1, lsl #(16 - 3) orr vp1, vp0, vp1, lsl #(16 - 3)
mov vp2, vp2, lsr #3 lsr vp2, #3
orr flags, #FACE_TRIANGLE orr flags, #FACE_TRIANGLE
@@ -105,7 +105,7 @@ faceAddRoomTriangles_asm:
str face, [ot, depth, lsl #2] str face, [ot, depth, lsl #2]
stmia face!, {flags, next, vp1, vp2} stmia face!, {flags, next, vp1, vp2}
.skip: .skip:
subs count, count, #1 subs count, #1
bne .loop bne .loop
ldr tmp, =gFacesBase ldr tmp, =gFacesBase

40
src/platform/gba/asm/transformMesh.s
View File

@@ -37,11 +37,11 @@ transformMesh_asm:
ldr ambient, =gLightAmbient ldr ambient, =gLightAmbient
ldr ambient, [ambient] ldr ambient, [ambient]
add vg, ambient, intensity add vg, ambient, intensity
mov vg, vg, asr #8 asr vg, #8
// clamp spAmbient to 0..31 // clamp spAmbient to 0..31
cmp vg, #31 cmp vg, #31
movge vg, #31 movge vg, #31
bic vg, vg, vg, asr #31 bic vg, vg, asr #31
ldr vp, =viewportRel ldr vp, =viewportRel
ldmia vp, {minXY, maxXY} ldmia vp, {minXY, maxXY}
@@ -57,66 +57,66 @@ transformMesh_asm:
ldrsh vy, [vertices], #2 ldrsh vy, [vertices], #2
ldrsh vz, [vertices], #2 ldrsh vz, [vertices], #2
bic vg, vg, #CLIP_MASK // clear clipping flags bic vg, #CLIP_MASK // clear clipping flags
// transform x // transform x
ldmia m!, {mx, my, mz, x} ldmia m!, {mx, my, mz, x}
mla x, mx, vx, x mla x, mx, vx, x
mla x, my, vy, x mla x, my, vy, x
mla x, mz, vz, x mla x, mz, vz, x
mov x, x, asr #FIXED_SHIFT asr x, #FIXED_SHIFT
// transform y // transform y
ldmia m!, {mx, my, mz, y} ldmia m!, {mx, my, mz, y}
mla y, mx, vx, y mla y, mx, vx, y
mla y, my, vy, y mla y, my, vy, y
mla y, mz, vz, y mla y, mz, vz, y
mov y, y, asr #FIXED_SHIFT asr y, #FIXED_SHIFT
// transform z // transform z
ldmia m!, {mx, my, mz, z} ldmia m!, {mx, my, mz, z}
mla z, mx, vx, z mla z, mx, vx, z
mla z, my, vy, z mla z, my, vy, z
mla z, mz, vz, z mla z, mz, vz, z
mov z, z, asr #FIXED_SHIFT asr z, #FIXED_SHIFT
sub m, #(12 * 4) // restore matrix ptr sub m, #(12 * 4) // restore matrix ptr
// z clipping // z clipping
cmp z, #VIEW_MIN cmp z, #VIEW_MIN
movle z, #VIEW_MIN movle z, #VIEW_MIN
orrle vg, vg, #CLIP_NEAR orrle vg, #CLIP_NEAR
cmp z, #VIEW_MAX cmp z, #VIEW_MAX
movge z, #VIEW_MAX movge z, #VIEW_MAX
orrge vg, vg, #CLIP_FAR orrge vg, #CLIP_FAR
// project // project
mov dz, z, lsr #4 mov dz, z, lsr #4
add dz, dz, z, lsr #6 add dz, z, lsr #6
divLUT tmp, dz divLUT tmp, dz
mul x, tmp, x mul x, tmp, x
mul y, tmp, y mul y, tmp, y
mov x, x, asr #(16 - PROJ_SHIFT) asr x, #(16 - PROJ_SHIFT)
mov y, y, asr #(16 - PROJ_SHIFT) asr y, #(16 - PROJ_SHIFT)
// viewport clipping // viewport clipping
ldmia sp, {minXY, maxXY} ldmia sp, {minXY, maxXY}
cmp x, minXY, asr #16 cmp x, minXY, asr #16
orrle vg, vg, #CLIP_LEFT orrle vg, #CLIP_LEFT
cmp x, maxXY, asr #16 cmp x, maxXY, asr #16
orrge vg, vg, #CLIP_RIGHT orrge vg, #CLIP_RIGHT
mov minXY, minXY, lsl #16 lsl minXY, #16
mov maxXY, maxXY, lsl #16 lsl maxXY, #16
cmp y, minXY, asr #16 cmp y, minXY, asr #16
orrle vg, vg, #CLIP_TOP orrle vg, #CLIP_TOP
cmp y, maxXY, asr #16 cmp y, maxXY, asr #16
orrge vg, vg, #CLIP_BOTTOM orrge vg, #CLIP_BOTTOM
add x, x, #(FRAME_WIDTH >> 1) add x, #(FRAME_WIDTH >> 1)
add y, y, #(FRAME_HEIGHT >> 1) add y, #(FRAME_HEIGHT >> 1)
// store the result // store the result
strh x, [res], #2 strh x, [res], #2
@@ -127,5 +127,5 @@ transformMesh_asm:
subs count, #1 subs count, #1
bne .loop bne .loop
add sp, sp, #SP_SIZE add sp, #SP_SIZE
ldmfd sp!, {r4-r11, pc} ldmfd sp!, {r4-r11, pc}

38
src/platform/gba/asm/transformRoom.s
View File

@@ -66,10 +66,10 @@ transformRoom_asm:
mla t, mx, vx, z mla t, mx, vx, z
mla t, my, vy, t mla t, my, vy, t
mla t, mz, vz, t mla t, mz, vz, t
mov t, t, asr #FIXED_SHIFT asr t, #FIXED_SHIFT
// skip if vertex is out of z-range // skip if vertex is out of z-range
add t, t, #VIEW_OFF add t, #VIEW_OFF
cmp t, #(VIEW_OFF + VIEW_OFF + VIEW_MAX) cmp t, #(VIEW_OFF + VIEW_OFF + VIEW_MAX)
movhi vg, #(CLIP_NEAR + CLIP_FAR) movhi vg, #(CLIP_NEAR + CLIP_FAR)
bhi .skip bhi .skip
@@ -82,58 +82,58 @@ transformRoom_asm:
mla y, mx, vx, y mla y, mx, vx, y
mla y, my, vy, y mla y, my, vy, y
mla y, mz, vz, y mla y, mz, vz, y
mov y, y, asr #FIXED_SHIFT asr y, #FIXED_SHIFT
// transform x // transform x
ldmdb m!, {mx, my, mz, x} ldmdb m!, {mx, my, mz, x}
mla x, mx, vx, x mla x, mx, vx, x
mla x, my, vy, x mla x, my, vy, x
mla x, mz, vz, x mla x, mz, vz, x
mov x, x, asr #FIXED_SHIFT asr x, #FIXED_SHIFT
// fog // fog
cmp z, #FOG_MIN cmp z, #FOG_MIN
subgt fog, z, #FOG_MIN subgt fog, z, #FOG_MIN
addgt vg, fog, lsl #6 addgt vg, fog, lsl #6
mov vg, vg, lsr #13 lsr vg, #13
cmp vg, #31 cmp vg, #31
movgt vg, #31 movgt vg, #31
// z clipping // z clipping
cmp z, #VIEW_MIN cmp z, #VIEW_MIN
movle z, #VIEW_MIN movle z, #VIEW_MIN
orrle vg, vg, #CLIP_NEAR orrle vg, #CLIP_NEAR
cmp z, #VIEW_MAX cmp z, #VIEW_MAX
movge z, #VIEW_MAX movge z, #VIEW_MAX
orrge vg, vg, #CLIP_FAR orrge vg, #CLIP_FAR
// project // project
mov dz, z, lsr #6 mov dz, z, lsr #6
add dz, dz, z, lsr #4 add dz, z, lsr #4
divLUT tmp, dz divLUT tmp, dz
mul x, tmp, x mul x, tmp, x
mul y, tmp, y mul y, tmp, y
mov x, x, asr #(16 - PROJ_SHIFT) asr x, #(16 - PROJ_SHIFT)
mov y, y, asr #(16 - PROJ_SHIFT) asr y, #(16 - PROJ_SHIFT)
// viewport clipping // viewport clipping
ldmia sp, {minXY, maxXY} ldmia sp, {minXY, maxXY}
cmp x, minXY, asr #16 cmp x, minXY, asr #16
orrle vg, vg, #CLIP_LEFT orrle vg, #CLIP_LEFT
cmp x, maxXY, asr #16 cmp x, maxXY, asr #16
orrge vg, vg, #CLIP_RIGHT orrge vg, #CLIP_RIGHT
mov minXY, minXY, lsl #16 lsl minXY, #16
mov maxXY, maxXY, lsl #16 lsl maxXY, #16
cmp y, minXY, asr #16 cmp y, minXY, asr #16
orrle vg, vg, #CLIP_TOP orrle vg, #CLIP_TOP
cmp y, maxXY, asr #16 cmp y, maxXY, asr #16
orrge vg, vg, #CLIP_BOTTOM orrge vg, #CLIP_BOTTOM
add x, x, #(FRAME_WIDTH >> 1) add x, #(FRAME_WIDTH >> 1)
add y, y, #(FRAME_HEIGHT >> 1) add y, #(FRAME_HEIGHT >> 1)
// store the result // store the result
strh x, [res, #-6] strh x, [res, #-6]
@@ -151,5 +151,5 @@ transformRoom_asm:
subs count, #1 subs count, #1
bne .loop bne .loop
add sp, sp, #SP_SIZE add sp, #SP_SIZE
ldmfd sp!, {r4-r11, pc} ldmfd sp!, {r4-r11, pc}

44
src/platform/gba/asm/transformRoomUW.s
View File

@@ -82,10 +82,10 @@ transformRoomUW_asm:
mla t, mx, vx, z mla t, mx, vx, z
mla t, my, vy, t mla t, my, vy, t
mla t, mz, vz, t mla t, mz, vz, t
mov t, t, asr #FIXED_SHIFT asr t, #FIXED_SHIFT
// skip if vertex is out of z-range // skip if vertex is out of z-range
add t, t, #VIEW_OFF add t, #VIEW_OFF
cmp t, #(VIEW_OFF + VIEW_OFF + VIEW_MAX) cmp t, #(VIEW_OFF + VIEW_OFF + VIEW_MAX)
movhi vg, #(CLIP_NEAR + CLIP_FAR) movhi vg, #(CLIP_NEAR + CLIP_FAR)
bhi .skip bhi .skip
@@ -98,68 +98,68 @@ transformRoomUW_asm:
mla y, mx, vx, y mla y, mx, vx, y
mla y, my, vy, y mla y, my, vy, y
mla y, mz, vz, y mla y, mz, vz, y
mov y, y, asr #FIXED_SHIFT asr y, #FIXED_SHIFT
// transform x // transform x
ldmdb m!, {mx, my, mz, x} ldmdb m!, {mx, my, mz, x}
mla x, mx, vx, x mla x, mx, vx, x
mla x, my, vy, x mla x, my, vy, x
mla x, mz, vz, x mla x, mz, vz, x
mov x, x, asr #FIXED_SHIFT asr x, #FIXED_SHIFT
// caustics // caustics
add tmp, sp, #SP_FRAME add tmp, sp, #SP_FRAME
ldmia tmp, {frame, caust, rand} ldmia tmp, {frame, caust, rand}
and tmp, count, #(MAX_RAND_TABLE - 1) and tmp, count, #(MAX_RAND_TABLE - 1)
ldr rand, [rand, tmp, lsl #2] ldr rand, [rand, tmp, lsl #2]
add rand, rand, frame add rand, frame
and rand, rand, #(MAX_CAUSTICS - 1) and rand, #(MAX_CAUSTICS - 1)
ldr caust, [caust, rand, lsl #2] ldr caust, [caust, rand, lsl #2]
add vg, vg, caust, lsl #5 add vg, caust, lsl #5
// fog // fog
cmp z, #FOG_MIN cmp z, #FOG_MIN
subgt fog, z, #FOG_MIN subgt fog, z, #FOG_MIN
addgt vg, fog, lsl #6 addgt vg, fog, lsl #6
mov vg, vg, lsr #13 lsr vg, #13
cmp vg, #31 cmp vg, #31
movgt vg, #31 movgt vg, #31
// z clipping // z clipping
cmp z, #VIEW_MIN cmp z, #VIEW_MIN
movle z, #VIEW_MIN movle z, #VIEW_MIN
orrle vg, vg, #CLIP_NEAR orrle vg, #CLIP_NEAR
cmp z, #VIEW_MAX cmp z, #VIEW_MAX
movge z, #VIEW_MAX movge z, #VIEW_MAX
orrge vg, vg, #CLIP_FAR orrge vg, #CLIP_FAR
// project // project
mov dz, z, lsr #6 mov dz, z, lsr #6
add dz, dz, z, lsr #4 add dz, z, lsr #4
divLUT tmp, dz divLUT tmp, dz
mul x, tmp, x mul x, tmp, x
mul y, tmp, y mul y, tmp, y
mov x, x, asr #(16 - PROJ_SHIFT) asr x, #(16 - PROJ_SHIFT)
mov y, y, asr #(16 - PROJ_SHIFT) asr y, #(16 - PROJ_SHIFT)
// viewport clipping // viewport clipping
ldmia sp, {minXY, maxXY} ldmia sp, {minXY, maxXY}
cmp x, minXY, asr #16 cmp x, minXY, asr #16
orrle vg, vg, #CLIP_LEFT orrle vg, #CLIP_LEFT
cmp x, maxXY, asr #16 cmp x, maxXY, asr #16
orrge vg, vg, #CLIP_RIGHT orrge vg, #CLIP_RIGHT
mov minXY, minXY, lsl #16 lsl minXY, #16
mov maxXY, maxXY, lsl #16 lsl maxXY, #16
cmp y, minXY, asr #16 cmp y, minXY, asr #16
orrle vg, vg, #CLIP_TOP orrle vg, #CLIP_TOP
cmp y, maxXY, asr #16 cmp y, maxXY, asr #16
orrge vg, vg, #CLIP_BOTTOM orrge vg, #CLIP_BOTTOM
add x, x, #(FRAME_WIDTH >> 1) add x, #(FRAME_WIDTH >> 1)
add y, y, #(FRAME_HEIGHT >> 1) add y, #(FRAME_HEIGHT >> 1)
// store the result // store the result
strh x, [res, #-6] strh x, [res, #-6]
@@ -177,5 +177,5 @@ transformRoomUW_asm:
subs count, #1 subs count, #1
bne .loop bne .loop
add sp, sp, #SP_SIZE add sp, #SP_SIZE
ldmfd sp!, {r4-r11, pc} ldmfd sp!, {r4-r11, pc}