mirror of
https://github.com/ClassiCube/ClassiCube.git
synced 2025-09-08 06:47:23 -04:00
Dreamcast: Slightly optimise clipping
This commit is contained in:
UnknownShadow200
parent
7a532a8662
commit
5ee12395a7
@ -1,15 +1,38 @@
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! FR0 = 0
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! FR1 = 0
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! FR2 = A.1
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! FR3 = B.1
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! FR4 = 0
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! FR5 = 0
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! FR6 = A.2
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! FR7 = B.2
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! FR8 = 0
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! FR9 = 0
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! FR10 = invT
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! FR11 = t
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! Calculates vertex as the near plane intersection point between two points:
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! float t = fabsf(v1->z) / fabsf(v2->z - v1->z)
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! float w = (1 - t) * v1->w + t * v2->w;
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!
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! out->c = type << 24
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! out->x = ((1 - t) * v1->x + t * v2->x) * 1/w
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! out->y = ((1 - t) * v1->y + t * v2->y) * 1/w
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! out->w = 1/w
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!
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! out->u = (1 - t) * v1->u + t * v2->u;
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! out->v = (1 - t) * v1->v + t * v2->v;
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!
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! out->b = (1 - t) * v1->b + t * v2->b;
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! out->g = (1 - t) * v1->g + t * v2->g;
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! out->r = (1 - t) * v1->r + t * v2->r;
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! out->a = (1 - t) * v1->a + t * v2->a;
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! Optimisations:
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! - w always ends up being zNear
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! - Calculations of (1 - t) * v1 + t * v2 can be rearranged to t * (v2 - v1) + v1
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! - These rearranges calculations can then take advantage of FMAC
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! Final calculation:
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! out->c = type << 24
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! out->x = ((v2->x - v1->x) + v1->x) * 1/zNear
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! out->y = ((v2->y - v1->y) + v1->y) * 1/zNear
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! out->w = 1/zNear
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!
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! out->u = (v2->u - v1->u) + v1->u;
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! out->v = (v2->v - v1->v) + v1->v;
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!
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! out->b = (v2->b - v1->b) + v1->b;
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! out->g = (v2->g - v1->g) + v1->g;
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! out->r = (v2->r - v1->r) + v1->r;
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! out->a = (v2->a - v1->a) + v1->a;
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! INPUT ARGUMENTS
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#define IN1 r4 // input vertex 1
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@ -23,187 +46,161 @@
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#define CL2 r5 // input colour 2
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#define CLO r7 // output colour
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! Writes output vertex as the near plane intersection point between two points:
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! float t = fabsf(v1->z) / fabsf(v2->z - v1->z)
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! float invt = 1.0f - t;
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! // note: w = invt * v1->w + t * v2->w;, always ends up being zNear
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!
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! out->c = type << 24
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! out->x = (invt * v1->x + t * v2->x) * 1/zNear
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! out->y = (invt * v1->y + t * v2->y) * 1/zNear
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! out->w = 1/zNear
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!
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! out->u = invt * v1->u + t * v2->u;
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! out->v = invt * v1->v + t * v2->v;
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!
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! out->b = invt * v1->b + t * v2->b;
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! out->g = invt * v1->g + t * v2->g;
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! out->r = invt * v1->r + t * v2->r;
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! out->a = invt * v1->a + t * v2->a;
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! To optimise these calculations, FIPR is used:
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! FIPR = FVm.x*FVn.x + FVm.y*FVn.x + FVm.z*FVn.z + FVm.w*FVn.w --> FVn.w
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! FIPR can be used to accomplish "vout->Q = invt * v1->Q + t * v2->Q" by:
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! - assigning x/y components to 0 for both vectors
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! - assigning t and invT to z/w of FVm vector
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! - assigning v1 and v2 to z/w of FVn vector
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! FIPR = 0*0 + 0*0 + t*v1->Q + invT*v2->Q --> FVn.w
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! FIPR = t*v1->Q + invT*v2->Q --> FVn.w
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#define F_T fr0
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#define F_W fr1
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#define F_X1 fr2
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#define F_X2 fr3
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#define F_Y1 fr4
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#define F_Y2 fr5
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#define F_U1 fr6
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#define F_U2 fr7
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#define F_V1 fr8
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#define F_V2 fr9
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#define F_Z1 fr10
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#define F_Z2 fr11
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#define Ftmp fr11
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.global _ClipEdge
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.align 4
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_ClipEdge:
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fschg ! FE (swap to 32 bit FPU loads/stores)
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add #28, IN1 ! EX, IN1 = &v1->z
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fldi0 fr4 ! LS, fr4 = 0
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fmov.s @IN1, fr2 ! LS, fr2 = v1->z
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add #28, IN2 ! EX, IN = &v2->z
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fldi0 fr5 ! LS, fr5 = 0
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fmov.s @IN2,fr11 ! LS, fr11 = v2->z
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fsub fr2,fr11 ! FE, fr11 = v2->z - v1->z
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fldi0 fr8 ! LS, fr8 = 0
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shll16 TYP ! EX, TYP <<= 16
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fmul fr11,fr11 ! FE, fr11 = (v2->z - v1->z) * (v2->z * v1->z)
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fldi0 fr9 ! LS, fr9 = 0
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fldi0 fr0 ! LS, fr0 = 0
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fldi0 fr1 ! LS, fr1 = 0
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fsrra fr11 ! FE, fr11 = 1 / abs(v2->z - v1->z)
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shll8 TYP ! EX, TYP <<= 8
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fabs fr2 ! LS, fr2 = abs(v1->z)
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mov.l TYP,@OUT ! LS, dst->cmd = TYPE
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fmul fr2,fr11 ! FE, fr11 = abs(v1->Z) / abs(v2->z - v1->z) --> t
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add #-24, IN1 ! EX, IN1 = &v1->x
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fldi1 fr10 ! LS, fr10 = 1
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add #-24, IN2 ! EX, IN2 = &v2->x
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add #4, OUT ! EX, OUT = &dst->x
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fsub fr11,fr10 ! FE, invT = 1.0 - t --> invT
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! Load X components
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fmov.s @IN1+, fr2 ! LS, A1 = v1->x, IN1 = &v1->y
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fmov.s @IN2+, fr3 ! LS, B1 = v2->x, IN2 = &v2->y
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! Start interpolating X
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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! Load Y components
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fmov.s @IN1, fr6 ! LS, A2 = v1->y
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fmov.s @IN2, fr7 ! LS, B2 = v2->y
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fschg ! FE (swap to 32 bit FPU loads/stores)
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! Start calculating interpolation factor
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add #28, IN1 ! EX, IN1 = &v1->z
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mov.l _NEAR_CLIP_W,TM1 ! LS, tmp = invW (1/zNear)
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fmov.s @IN1, F_Z1 ! LS, Z1 = v1->z
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add #28, IN2 ! EX, IN = &v2->z
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fmov.s @IN2, F_Z2 ! LS, Z2 = v2->z
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shll16 TYP ! EX, TYP <<= 16
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fsub F_Z1, Ftmp ! FE, tmp = v2->z - v1->z
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! Load W
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mov.l _NEAR_CLIP_W,TM1 ! tmp = zNear
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lds TM1,fpul ! LS, FPUL = zNear
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fsts fpul,fr2 ! LS, fr2 = FPUL
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! Store interpolated X
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fmul fr2,fr3 ! EX, fr7 = LERP * invW
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fmov.s fr3,@OUT ! LS, dst->x = LERP * invW
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add #4, OUT ! EX, OUT = &dst->y
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lds TM1,fpul ! LS, FPUL = invW (1/zNear)
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add #-24, IN1 ! EX, IN1 = &v1->x
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fsts fpul,F_W ! LS, invW = FPUL
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add #-24, IN2 ! EX, IN2 = &v2->x
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! Finish calculating interpolation factor
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shll8 TYP ! EX, TYP <<= 8
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fmul Ftmp,Ftmp ! FE, tmp = (v2->z - v1->z) * (v2->z * v1->z)
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mov.l TYP,@OUT ! LS, dst->cmd = TYPE
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! Start interpolating Y
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fipr fv8, fv4 ! FE, LERP(A2, B2)
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! Skip Z of input vertices
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add #8, IN1 ! EX, IN1 = &v1->u
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add #8, IN2 ! EX, IN2 = &v2->u
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! Load components
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fmov.s @IN1+, F_X1 ! LS, X1 = v1->x
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fmov.s @IN2+, F_X2 ! LS, X2 = v2->x
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fmov.s @IN1+, F_Y1 ! LS, Y1 = y1->x
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fmov.s @IN2+, F_Y2 ! LS, Y2 = y2->x
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fsrra Ftmp ! FE, tmp = 1 / abs(v2->z - v1->z)
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add #4, IN1 ! EX, skip over W
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fabs F_Z1 ! LS, z1 = abs(v1->z)
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add #4, IN2 ! EX, skip over W
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fmov.s @IN1+, F_U1 ! LS, U1 = v1->u
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fmov.s @IN2+, F_U2 ! LS, U2 = v2->u
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fmov.s @IN1+, F_V1 ! LS, V1 = v1->v
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fmul F_Z1,Ftmp ! FE, tmp = abs(v1->Z) / abs(v2->z - v1->z)
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fmov.s @IN2+, F_V2 ! LS, V2 = v2->v
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! Store interpolated Y
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fmul fr2,fr7 ! EX, fr7 = LERP * invW
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fmov.s fr7,@OUT ! LS, OUT->y = LERP * invW
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add #4, OUT ! EX, OUT = &dst->w
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! Store W
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fmov.s fr2,@OUT ! LS, OUT->w = 1/zNear
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add #4, OUT ! EX, OUT = &dst->u
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! Interpolate vertices
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fsub F_X1, F_X2 ! FE, X2 = X2 - X1
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fsub F_Y1, F_Y2 ! FE, Y2 = Y2 - Y1
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fsub F_U1, F_U2 ! FE, U2 = U2 - U1
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fmov Ftmp, F_T ! LS, T = tmp
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fsub F_V1, F_V2 ! FE, V2 = V2 - V1
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fmac F_T,F_X2,F_X1 ! FE, X = T * (X2 - X1) + X1
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fmac F_T,F_Y2,F_Y1 ! FE, Y = T * (Y2 - Y1) + Y1
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fmac F_T,F_U2,F_U1 ! FE, U = T * (U2 - U1) + U1
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fmac F_T,F_V2,F_V1 ! FE, V = T * (V2 - V1) + V1
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! Load U components
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fmov.s @IN1+, fr2 ! LS, A1 = v1->u, IN1 = &v1->v
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fmov.s @IN2+, fr3 ! LS, B1 = v2->u, IN2 = &v1->v
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! Adjust by w
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fmul F_W, F_X1 ! FE, x = invW * x
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fmul F_W, F_Y1 ! FE, x = invY * x
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! Start interpolating U
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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! Load V components
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fmov.s @IN1+, fr6 ! LS, A2 = v1->v, IN1 = &v1->bgra
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fmov.s @IN2+, fr7 ! LS, B2 = v2->v, IN2 = &v2->bgra
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! Store interpolated U
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fmov.s fr3,@OUT ! LS, dst->u = LERP
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add #4, OUT ! EX, OUT = &dst->v
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! Start interpolating V
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fipr fv8, fv4 ! FE, LERP(A2, B2)
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! Load colours and check if equal
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mov.l @IN1,CL1 ! LS, ACOLOR = v1->bgra
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mov.l @IN2,CL2 ! LS, BCOLOR = v2->bgra
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cmp/eq CL1,CL2 ! MT, T = ACOLOR == BCOLOR
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! Store V
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fmov.s fr7,@OUT ! LS, dst->v = LERP
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add #4, OUT ! EX, OUT = &dst->bgra
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mov.l @IN1,CL1 ! LS, ACOLOR = v1->bgra
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mov.l @IN2,CL2 ! LS, BCOLOR = v2->bgra
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cmp/eq CL1,CL2 ! MT, T = ACOLOR == BCOLOR
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add #28, OUT ! EX, dst = &dst->padding
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! Bypass RGBA interpolation if unnecessary
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bt.s 1f ! BR, if (T) goto 1;
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mov CL1,CLO ! MT, OUTCOLOR = ACOLOR (branch delay instruction)
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bt.s 1f ! BR, if (T) goto 1;
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mov CL1,CLO ! MT, OUTCOLOR = ACOLOR (branch delay instruction)
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! Interpolate B
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extu.b CL1,TM1 ! EX, val = ACOLOR.b
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr2 ! FE, fr2 = float(FPUL)
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extu.b CL2,TM1 ! EX, val = BCOLOR.b
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr3 ! FE, fr3 = float(FPUL)
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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shlr8 CL1 ! EX, ACOLOR >>= 8
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc fr3,fpul ! FE, FPUL = int(lerp)
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sts fpul,TM2 ! LS, tmp = FPUL
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extu.b CL1,TM1 ! EX, val = ACOLOR.b
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z1 ! FE, C1 = float(val)
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extu.b CL2,TM1 ! EX, val = BCOLOR.b
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z2 ! FE, C2 = float(val)
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fsub F_Z1, F_Z2 ! FE, C2 = C2 - C1
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fmac F_T,F_Z2,F_Z1 ! FE, C = T * (C2 - C1) + C1
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shlr8 CL1 ! EX, ACOLOR >>= 8
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc F_Z1,fpul ! FE, FPUL = int(C)
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sts fpul,TM2 ! LS, tmp = FPUL
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! Interpolate G
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extu.b CL1,TM1 ! EX, val = ACOLOR.g
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr2 ! FE, fr2 = float(FPUL)
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extu.b CL2,TM1 ! EX, val = BCOLOR.g
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr3 ! FE, fr3 = float(FPUL)
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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shlr8 CL1 ! EX, ACOLOR >>= 8
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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mov TM2,CLO ! MT, OUTCOLOR.b = tmp
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc fr3,fpul ! FE, FPUL = int(lerp)
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sts fpul,TM2 ! LS, tmp = FPUL
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extu.b CL1,TM1 ! EX, val = ACOLOR.g
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z1 ! FE, C1 = float(val)
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extu.b CL2,TM1 ! EX, val = BCOLOR.g
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z2 ! FE, C2 = float(val)
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fsub F_Z1, F_Z2 ! FE, C2 = C2 - C1
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fmac F_T,F_Z2,F_Z1 ! FE, C = T * (C2 - C1) + C1
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shlr8 CL1 ! EX, ACOLOR >>= 8
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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mov TM2,CLO ! MT, OUTCOLOR.b = tmp
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc F_Z1,fpul ! FE, FPUL = int(C)
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sts fpul,TM2 ! LS, tmp = FPUL
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! Interpolate R
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extu.b CL1,TM1 ! EX, val = ACOLOR.r
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr2 ! FE, fr2 = float(FPUL)
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extu.b CL2,TM1 ! EX, val = BCOLOR.r
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr3 ! FE, fr3 = float(FPUL)
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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shlr8 CL1 ! EX, ACOLOR >>= 8
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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shll8 TM2 ! EX, tmp <<= 8
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or TM2,CLO ! EX, OUTCOLOR.g |= tmp
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc fr3,fpul ! FE, FPUL = int(lerp)
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sts fpul,TM2 ! LS, tmp = FPUL
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extu.b CL1,TM1 ! EX, val = ACOLOR.r
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z1 ! FE, C1 = float(val)
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extu.b CL2,TM1 ! EX, val = BCOLOR.r
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z2 ! FE, C2 = float(val)
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fsub F_Z1, F_Z2 ! FE, C2 = C2 - C1
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fmac F_T,F_Z2,F_Z1 ! FE, C = T * (C2 - C1) + C1
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shlr8 CL1 ! EX, ACOLOR >>= 8
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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shll8 TM2 ! EX, tmp <<= 8
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or TM2,CLO ! EX, OUTCOLOR.g |= tmp
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shlr8 CL2 ! EX, BCOLOR >>= 8
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ftrc F_Z1,fpul ! FE, FPUL = int(C)
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sts fpul,TM2 ! LS, tmp = FPUL
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! Interpolate A
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extu.b CL1,TM1 ! EX, val = ACOLOR.a
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr2 ! FE, fr2 = float(FPUL)
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extu.b CL2,TM1 ! EX, val = BCOLOR.a
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lds TM1,fpul ! LS, FPUL = val
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float fpul,fr3 ! FE, fr3 = float(FPUL)
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fipr fv8, fv0 ! FE, LERP(A1, B1)
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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shll16 TM2 ! EX, tmp <<= 16
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or TM2,CLO ! EX, OUTCOLOR.r |= tmp
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ftrc fr3,fpul ! FE, FPUL = int(lerp)
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sts fpul,TM2 ! LS, tmp = FPUL
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extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
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shll16 TM2 ! EX, tmp <<= 16
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shll8 TM2 ! EX, tmp <<= 8
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or TM2,CLO ! EX, OUTCOLOR.a |= tmp
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extu.b CL1,TM1 ! EX, val = ACOLOR.a
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lds TM1,fpul ! LS, FPUL = val
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float fpul,F_Z1 ! FE, C1 = float(val)
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extu.b CL2,TM1 ! EX, val = BCOLOR.a
|
||||
lds TM1,fpul ! LS, FPUL = val
|
||||
float fpul,F_Z2 ! FE, C2 = float(val)
|
||||
fsub F_Z1, F_Z2 ! FE, C2 = C2 - C1
|
||||
fmac F_T,F_Z2,F_Z1 ! FE, C = T * (C2 - C1) + C1
|
||||
extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
|
||||
shll16 TM2 ! EX, tmp <<= 16
|
||||
or TM2,CLO ! EX, OUTCOLOR.r |= tmp
|
||||
ftrc F_Z1,fpul ! FE, FPUL = int(C)
|
||||
sts fpul,TM2 ! LS, tmp = FPUL
|
||||
extu.b TM2,TM2 ! EX, tmp = (uint8)tmp
|
||||
shll16 TM2 ! EX, tmp <<= 16
|
||||
shll8 TM2 ! EX, tmp <<= 8
|
||||
or TM2,CLO ! EX, OUTCOLOR.a |= tmp
|
||||
|
||||
1:
|
||||
mov.l CLO,@OUT ! LS, OUT->color = OUTCOLOR
|
||||
add #-24, OUT ! EX, OUT += 8
|
||||
fschg ! FE (swap to 64 bit FPU loads/stores)
|
||||
rts ! CO, return after executing instruction in delay slot
|
||||
pref @OUT ! LS, trigger store queue flush
|
||||
! Store output
|
||||
mov.l CLO,@-OUT ! LS, dst->color = OUTCOLOR
|
||||
fmov.s F_V1,@-OUT ! LS, dst->v = v
|
||||
fmov.s F_U1,@-OUT ! LS, dst->u = u
|
||||
fmov.s F_W ,@-OUT ! LS, dst->w = invW
|
||||
fmov.s F_Y1,@-OUT ! LS, dst->y = y
|
||||
fmov.s F_X1,@-OUT ! LS, dst->x = x
|
||||
|
||||
fschg ! FE (swap to 64 bit FPU loads/stores)
|
||||
rts ! CO, return after executing instruction in delay slot
|
||||
pref @OUT ! LS, trigger store queue flush
|
||||
.size _ClipEdge, .-_ClipEdge
|
||||
.type _ClipEdge, %function
|
||||
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user