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#407 32X add missing transformRoom.s
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,224 @@ | ||
| #include "common.i" | ||
| SEG_TRANS | ||
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| #define tmp r0 | ||
| #define maxZ r1 | ||
| #define divLUT r2 | ||
| #define res r3 | ||
| #define vertices r4 // arg | ||
| #define count r5 // arg | ||
| #define vp r6 | ||
| #define m r7 | ||
| #define x r8 | ||
| #define y r9 | ||
| #define z r10 | ||
| #define vx r11 | ||
| #define vy r12 | ||
| #define vz r13 | ||
| #define vg r14 | ||
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| #define minX tmp | ||
| #define minY tmp | ||
| #define maxX tmp | ||
| #define maxY tmp | ||
| #define minZ tmp | ||
| #define dz tmp | ||
| #define fog vx | ||
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| .macro transform v, row | ||
| mov.w @(\row * 6, m), tmp | ||
| muls.w vx, tmp | ||
| sts MACL, \v | ||
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| mov.w @(\row * 6 + 2, m), tmp | ||
| muls.w vy, tmp | ||
| sts MACL, tmp | ||
| add tmp, \v | ||
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| mov.w @(\row * 6 + 4, m), tmp | ||
| muls.w vz, tmp | ||
| sts MACL, tmp | ||
| add tmp, \v | ||
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| mov.w @(\row * 2 + M03, m), tmp | ||
| shll2 \v | ||
| shlr8 \v | ||
| exts.w \v, \v | ||
| add tmp, \v | ||
| .endm | ||
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| .align 4 | ||
| .global _transformRoom_asm | ||
| _transformRoom_asm: | ||
| // push | ||
| mov.l r8, @-sp | ||
| mov.l r9, @-sp | ||
| mov.l r10, @-sp | ||
| mov.l r11, @-sp | ||
| mov.l r12, @-sp | ||
| mov.l r13, @-sp | ||
| mov.l r14, @-sp | ||
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| mov.l var_viewportRel, vp | ||
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| mov.l var_gVerticesBase, tmp | ||
| mov.l @tmp, res | ||
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| mov.l var_gMatrixPtr, tmp | ||
| mov.l @tmp, m | ||
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| mov.l var_divTable, divLUT | ||
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| add #8, res // extra offset for @-Rn | ||
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| .loop: | ||
| // unpack vertex | ||
| mov.l @vertices+, vg | ||
| extu.b vg, vx | ||
| shlr8 vg | ||
| extu.b vg, vy | ||
| shlr8 vg | ||
| extu.b vg, vz | ||
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| // transform to view space | ||
| transform z, 2 | ||
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| .z_range_check: | ||
| // tmp = z + VIEW_OFF = z + 4096 | ||
| mov #16, tmp | ||
| shll8 tmp | ||
| add z, tmp | ||
| // maxZ = VIEW_OFF + VIEW_MAX + VIEW_OFF = 18432 | ||
| mov #72, maxZ | ||
| shll8 maxZ | ||
| // check if z in [-VIEW_OFF..VIEW_MAX + VIEW_OFF] | ||
| cmp/hi maxZ, tmp | ||
| bf/s .visible | ||
| mov #40, maxZ // maxZ = 40 (delay slot) | ||
| mov #(CLIP_NEAR + CLIP_FAR), vg | ||
| mov.w vg, @-res | ||
| dt count | ||
| bf/s .loop | ||
| add #10, res | ||
| bra .done | ||
| // delay slot from transform (mov.w) | ||
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| .visible: | ||
| transform x, 0 | ||
| transform y, 1 | ||
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| // maxZ = VIEW_MAX = (1024 * 10) = (40 << 8) | ||
| shll8 maxZ | ||
| shlr8 vg | ||
| // tmp = FOG_MIN = 6144 = (24 << 8) | ||
| mov #24, tmp | ||
| shll8 tmp | ||
| // if z <= FOG_MIN -> skip fog calc | ||
| cmp/gt tmp, z | ||
| bf/s .clip_z_near | ||
| mov z, fog | ||
| sub tmp, fog // fog = z - FOG_MIN | ||
| shll fog // FOG_SHIFT | ||
| shlr8 fog // shift down to 0..31 range | ||
| add fog, vg | ||
| // vg = min(vg, 31) | ||
| mov #31, tmp | ||
| cmp/gt tmp, vg | ||
| bf .clip_z_near | ||
| mov #31, vg | ||
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| // z clipping | ||
| .clip_z_near: | ||
| shll8 vg // clear lower 8-bits of vg for clipping flags | ||
| mov #VIEW_MIN, minZ // minZ = VIEW_MIN = 64 | ||
| cmp/gt z, minZ | ||
| bf/s .clip_z_far | ||
| cmp/ge maxZ, z | ||
| mov minZ, z | ||
| add #CLIP_NEAR, vg | ||
| .clip_z_far: | ||
| bf/s .project | ||
| mov z, dz // dz = z (delay slot) | ||
| mov maxZ, z | ||
| add #CLIP_FAR, vg | ||
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| .project: | ||
| // dz = divTable[z >> (PROJ_SHIFT = 4)] | ||
| shlr2 dz | ||
| shlr2 dz | ||
| shll dz | ||
| mov.w @(dz, divLUT), dz | ||
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| // x = x * dz >> (16 - PROJ_SHIFT) | ||
| muls.w dz, x | ||
| sts MACL, x | ||
| shll2 x | ||
| shll2 x | ||
| shlr16 x | ||
| exts.w x, x | ||
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| // y = y * dz >> (16 - PROJ_SHIFT) | ||
| muls.w dz, y | ||
| sts MACL, y | ||
| shll2 y | ||
| shll2 y | ||
| shlr16 y | ||
| exts.w y, y | ||
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| // viewport clipping | ||
| .clip_vp_minX: | ||
| mov.w @(0, vp), minX | ||
| cmp/gt x, minX | ||
| bf/s .clip_vp_minY | ||
| mov.w @(2, vp), minY | ||
| add #CLIP_LEFT, vg | ||
| .clip_vp_minY: | ||
| cmp/ge y, minY | ||
| bf/s .clip_vp_maxX | ||
| mov.w @(4, vp), maxX | ||
| add #CLIP_TOP, vg | ||
| .clip_vp_maxX: | ||
| cmp/gt maxX, x | ||
| bf/s .clip_vp_maxY | ||
| mov.w @(6, vp), maxY | ||
| add #CLIP_RIGHT, vg | ||
| .clip_vp_maxY: | ||
| cmp/ge maxY, y | ||
| bf/s .store_vertex | ||
| dt count | ||
| add #CLIP_BOTTOM, vg | ||
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| .store_vertex: | ||
| // x += FRAME_WIDTH / 2 (160) | ||
| add #100, x | ||
| add #60, x | ||
| // y += FRAME_HEIGHT / 2 (112) | ||
| add #112, y | ||
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| mov.w vg, @-res | ||
| mov.w z, @-res | ||
| mov.w y, @-res | ||
| mov.w x, @-res | ||
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| bf/s .loop | ||
| add #16, res | ||
| .done: | ||
| // pop | ||
| mov.l @sp+, r14 | ||
| mov.l @sp+, r13 | ||
| mov.l @sp+, r12 | ||
| mov.l @sp+, r11 | ||
| mov.l @sp+, r10 | ||
| mov.l @sp+, r9 | ||
| rts | ||
| mov.l @sp+, r8 | ||
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| .align 2 | ||
| var_viewportRel: | ||
| .long _viewportRel | ||
| var_gVerticesBase: | ||
| .long _gVerticesBase | ||
| var_gMatrixPtr: | ||
| .long _gMatrixPtr | ||
| var_divTable: | ||
| .long _divTable |