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[opencl] Fix nodata value in slope, aspect and hillshade
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,109 +1,56 @@ | ||
| #include "calcfirstder.cl" | ||
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| // Calculate the first derivative from a 3x3 cell matrix | ||
| float calcFirstDer( float x11, float x21, float x31, float x12, float x22, float x32, float x13, float x23, float x33, | ||
| float inputNodataValue, float zFactor, float mCellSize ) | ||
| { | ||
| //the basic formula would be simple, but we need to test for nodata values... | ||
| //X: return (( (x31 - x11) + 2 * (x32 - x12) + (x33 - x13) ) / (8 * cellSizeX)); | ||
| //Y: return (((x11 - x13) + 2 * (x21 - x23) + (x31 - x33)) / ( 8 * cellSizeY)); | ||
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| if ( x11 == inputNodataValue ) | ||
| { | ||
| x11 = x22; | ||
| } | ||
| if ( x12 == inputNodataValue ) | ||
| { | ||
| x12 = x22; | ||
| } | ||
| if ( x13 == inputNodataValue ) | ||
| { | ||
| x13 = x22; | ||
| } | ||
| if ( x21 == inputNodataValue ) | ||
| { | ||
| x21 = x22; | ||
| } | ||
| if ( x23 == inputNodataValue ) | ||
| { | ||
| x23 = x22; | ||
| } | ||
| if ( x31 == inputNodataValue ) | ||
| { | ||
| x31 = x22; | ||
| } | ||
| if ( x32 == inputNodataValue ) | ||
| { | ||
| x32 = x22; | ||
| } | ||
| if ( x33 == inputNodataValue ) | ||
| { | ||
| x33 = x22; | ||
| } | ||
| return ( ( ( x13 + x23 + x23 + x33 ) - ( x11 + x21 + x21 + x31 ) ) / ( 8 * mCellSize )) * zFactor; | ||
| } | ||
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| #ifndef M_PI | ||
| #define M_PI 3.14159265358979323846 | ||
| #endif | ||
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| __kernel void processNineCellWindow( __global float *scanLine1, | ||
| __global float *scanLine2, | ||
| __global float *scanLine3, | ||
| __global uchar4 *resultLine, // This is an image! | ||
| __global float *rasterParams // [ mInputNodataValue, mOutputNodataValue, mZFactor, mCellSizeX, mCellSizeY, | ||
| // azimuthRad, cosZenithRad, sinZenithRad, mOpacity ] | ||
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| ) { | ||
| __global float *scanLine2, | ||
| __global float *scanLine3, | ||
| __global float *resultLine, | ||
| __global float *rasterParams // mInputNodataValue, mOutputNodataValue, mZFactor, mCellSizeX, mCellSizeY, zenith_rad, azimuth_rad | ||
| ) | ||
| { | ||
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| // Get the index of the current element | ||
| const int i = get_global_id(0); | ||
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| float res; | ||
| if ( scanLine2[i+1] == rasterParams[1] ) | ||
| if ( scanLine2[i+1] == rasterParams[0] ) | ||
| { | ||
| res = rasterParams[2]; | ||
| resultLine[i] = rasterParams[1]; | ||
| } | ||
| else | ||
| { | ||
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| // Do the operation | ||
| //return (( (x31 - x11) + 2 * (x32 - x12) + (x33 - x13) ) / (8 * mCellSizeX)) | ||
| float derX = calcFirstDer( scanLine1[i], scanLine2[i], scanLine3[i], | ||
| scanLine1[i+1], scanLine2[i+1], scanLine3[i+1], | ||
| scanLine1[i+2], scanLine2[i+2], scanLine3[i+2], | ||
| rasterParams[0], rasterParams[2], rasterParams[3] | ||
| ); | ||
| //return (((x11 - x13) + 2 * (x21 - x23) + (x31 - x33)) / ( 8 * mCellSizeY)); | ||
| float derY = calcFirstDer( scanLine1[i+2], scanLine1[i+1], scanLine1[i], | ||
| scanLine2[i+2], scanLine2[i+1], scanLine2[i], | ||
| scanLine3[i+2], scanLine3[i+1], scanLine3[i], | ||
| rasterParams[0], rasterParams[2], rasterParams[4] | ||
| ); | ||
| float derX = calcFirstDer( scanLine1[i], scanLine1[i+1], scanLine1[i+2], | ||
| scanLine2[i], scanLine2[i+1], scanLine2[i+2], | ||
| scanLine3[i], scanLine3[i+1], scanLine3[i+2], | ||
| rasterParams[0], rasterParams[1], rasterParams[2], rasterParams[3] ); | ||
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| float derY = calcFirstDer( scanLine3[i], scanLine2[i], scanLine1[i], | ||
| scanLine3[i+1], scanLine2[i+1], scanLine1[i+1], | ||
| scanLine3[i+2], scanLine2[i+2], scanLine1[i+2], | ||
| rasterParams[0], rasterParams[1], rasterParams[2], rasterParams[4]); | ||
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| if ( derX == rasterParams[1] || derY == rasterParams[1] ) | ||
| { | ||
| res = rasterParams[2]; | ||
| resultLine[i] = rasterParams[1]; | ||
| } | ||
| else | ||
| { | ||
| float aspect = atan2( derX, - derY ); | ||
| // aspect = aspect * M_PI * 255; // for display | ||
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| float slope = sqrt( derX * derX + derY * derY ); | ||
| slope = atan( slope ); | ||
| // res = slope * M_PI * 255; for display | ||
| float slope_rad = sqrt( derX * derX + derY * derY ); | ||
| slope_rad = atan( slope_rad ); | ||
| float aspect_rad; | ||
| if ( derX == 0.0f && derY == 0.0f) | ||
| aspect_rad = rasterParams[7] / 2.0f; | ||
| else | ||
| aspect_rad = M_PI + atan2( derX, derY ); | ||
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| // Final | ||
| res = 255.0f * ( rasterParams[6] * cos( slope ) | ||
| + rasterParams[7] * sin( slope ) | ||
| * cos( rasterParams[5] - aspect ) ); | ||
| resultLine[i] = max(0.0f, 255.0f * ( ( rasterParams[5] * cos( slope_rad ) ) + | ||
| ( rasterParams[6] * sin( slope_rad ) * | ||
| cos( rasterParams[7] - aspect_rad ) ) ) ); | ||
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| } | ||
| } | ||
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| // Opacity | ||
| res = res * rasterParams[7]; | ||
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| resultLine[i] = (uchar4)(res, res, res, 255 * rasterParams[7]); | ||
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| } |
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