Annotation of /trunk/test/MIP/mip.cl

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1 :	lamonts	302	/* mip.cl
2 :			*
3 :			* COPYRIGHT (c) 2010 The Diderot Project (http://diderot.cs.uchicago.edu)
4 :			* All rights reserved.
5 :			*
6 :			* An OpenCL file containing a probe kernel and mip kernel implementation
7 :			*/
8 :
9 :			__constant float h[4][4] = { // bspln3
10 :			{ 1.33333, 2.0, 1.0, 0.166667 }, // -2 .. -1
11 :			{ 0.666667, 0.0, -1.0, -0.5 }, // -1 .. 0
12 :			{ 0.666667, 0.0, -1.0, 0.5 }, // 0 .. 1
13 :			{ 1.33333, -2.0, 1.0, -0.166667 }, // 1 .. 2
14 :			};
15 :
16 :	jhr	310	//__constant float4 eyeVec = (float4)(25,15,10,1);
17 :			//__constant float4 origVec = (float4)(8.83877,2.5911,7.65275,0);
18 :			//__constant float4 cVec= (float4)(-0.0151831,0.0278357,0,0);
19 :			//__constant float4 rVec = (float4)(0.0074887,0.00408474,-0.0305383,0);
20 :			__constant float4 eyeVec = (float4)(127.331, -1322.05, 272.53, 0);
21 :			__constant float4 origVec = (float4)(122.835,17.7112,188.044, 0);
22 :			__constant float4 cVec= (float4)(-0.00403611,-0.029826,-0.244066, 0);
23 :			__constant float4 rVec = (float4)(-0.245595,-0.0112916,0.00544129, 0);
24 :			__constant float stepSize = 0.5;
25 :	lamonts	302	__constant int s = 2;
26 :
27 :
28 :			__kernel float probe(float * img, int * sAxis, float4 imgPos) {
29 :
30 :			float probedVal;
31 :			float4 f, nf, t, hx, hy, hz;
32 :			int4 n;
33 :
34 :			float4 d = (float4) (h[3][0],h[2][0],h[1][0],h[0][0]);
35 :			float4 c = (float4) (h[3][1],h[2][1],h[1][1],h[0][1]);
36 :			float4 b = (float4) (h[3][2],h[2][2],h[1][2],h[0][2]);
37 :			float4 a = (float4) (h[3][3],h[2][3],h[1][3],h[0][3]);
38 :
39 :			f = modf(imgPos,&nf);
40 :			n = convert_int4(nf);
41 :
42 :
43 :			t = (float4) (f.x + 1, f.x, f.x -1, f.x - 2);
44 :			hx = d + t * (c + t * (b + t*a));
45 :			t = (float4) (f.y + 1, f.y, f.y - 1, f.y - 2);
46 :			hy = d + t * (c + t * (b + t*a));
47 :			t = (float4) (f.z + 1, f.z, f.z - 1, f.z -2);
48 :			hz = d + t * (c + t * (b + t*a));
49 :
50 :	jhr	310	float vx[4];
51 :			float vy[4];
52 :	lamonts	302
53 :	jhr	310	for(int k = 1-s; k <= s; k++) { // z is the slowest dimension
54 :			for(int j = 1-s; j <= s; j++) { // y is the medium dimension
55 :			int index = sAxis[0]*sAxis[1]*(n.z+k) + sAxis[0]*(n.y+j) + (n.x-1);
56 :			float4 v = (float4)(img[index], img[index+1], img[index+2], img[index+3]);
57 :			vx[j+s-1] = dot(v,hx);
58 :			}
59 :			vy[k+s-1] = dot ((float4) (vx[0],vx[1],vx[2],vx[3]),hy);
60 :	lamonts	302	}
61 :
62 :	jhr	310	probedVal = dot((float4) (vy[0],vy[1],vy[2],vy[3]),hz);
63 :	lamonts	302
64 :			return probedVal;
65 :
66 :			}
67 :			__kernel void mip ( float * img,
68 :			float * out,
69 :			float16 transformMatrix,
70 :			int2 workDim,
71 :			int * sAxis){
72 :
73 :	lamonts	177	int row = get_global_id(0), col = get_global_id(1);
74 :	lamonts	302
75 :			if(row <= workDim.x && col <= workDim.y)
76 :			{
77 :			float t, probedVal, maxValue = -INFINITY;
78 :			float4 imgPt;
79 :	lamonts	177
80 :	lamonts	302	float4 pos = origVec + (float)row * rVec + (float)col * cVec;
81 :			float4 dir = normalize(pos - eyeVec);
82 :	jhr	218
83 :	lamonts	302	pos.w = 0.0;
84 :			dir.w = 0.0;
85 :
86 :	jhr	310	for(t = 0.0; t < 200; t+= stepSize)
87 :	lamonts	302	{
88 :	lamonts	177	pos = pos + stepSize * dir;
89 :
90 :			// Transform the value to image space position.
91 :			imgPt = (float4) (dot(pos,transformMatrix.s0123),
92 :	jhr	218	dot(pos,transformMatrix.s4567),
93 :			dot(pos,transformMatrix.s89ab),
94 :			dot(pos,transformMatrix.scdef));
95 :	lamonts	177
96 :	lamonts	302
97 :			if( (imgPt.x > 1 && imgPt.x < (sAxis[0] - 2)) &&
98 :			(imgPt.y > 1 && imgPt.y < (sAxis[1]- 2)) &&
99 :			(imgPt.z > 1 && imgPt.z < (sAxis[2] - 2)))
100 :	lamonts	191	{
101 :	lamonts	302	probedVal = probe(img,sAxis,imgPt);
102 :	jhr	218	if(maxValue < probedVal)
103 :	lamonts	203	maxValue = probedVal;
104 :	lamonts	191	}
105 :	lamonts	203	}
106 :	lamonts	302	out[row * workDim.x + col] = maxValue;
107 :	lamonts	177	}
108 :			}

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