| [opengtl-commits] [597] add more kernels to the collection |
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Revision: 597
Author: cyrille
Date: 2009-03-12 17:57:55 +0100 (Thu, 12 Mar 2009)
Log Message:
-----------
add more kernels to the collection
Added Paths:
-----------
trunk/shiva-collections/filters/blur.shiva
trunk/shiva-collections/filters/oilify.shiva
trunk/shiva-collections/generators/MandelbrotSet.shiva
trunk/shiva-collections/generators/PerlinNoise.shiva
Copied: trunk/shiva-collections/filters/blur.shiva (from rev 560, trunk/OpenGTL/OpenShiva/tests/convolution/blur.shiva)
===================================================================
--- trunk/shiva-collections/filters/blur.shiva (rev 0)
+++ trunk/shiva-collections/filters/blur.shiva 2009-03-12 16:57:55 UTC (rev 597)
@@ -0,0 +1,7 @@
+kernel Blur
+{
+ void evaluatePixel(image img, out pixel result)
+ {
+ result = ( img.sampleNearest( result.coord ) + img.sampleNearest( result.coord - 1.0 ) + img.sampleNearest( result.coord + 1.0 ) ) / 3.0;
+ }
+}
Property changes on: trunk/shiva-collections/filters/blur.shiva
___________________________________________________________________
Name: svn:mergeinfo
+
Copied: trunk/shiva-collections/filters/oilify.shiva (from rev 560, trunk/OpenGTL/OpenShiva/tests/convolution/oilify.shiva)
===================================================================
--- trunk/shiva-collections/filters/oilify.shiva (rev 0)
+++ trunk/shiva-collections/filters/oilify.shiva 2009-03-12 16:57:55 UTC (rev 597)
@@ -0,0 +1,40 @@
+kernel Oilify
+{
+ int intensity( float4 px )
+ {
+ int v = (0.5 * px[1] + 0.3 * px[2] + 0.2 * px[0]) * 255;
+ if( v < 0 ) return 0;
+ if( v > 255) return 255;
+ return v;
+ }
+ void evaluatePixel(image4 img, out pixel4 result)
+ {
+ int xc = result.coord.x;
+ int yc = result.coord.y;
+ int histogram[256];
+ for(int i = 0; i < 255; ++i)
+ {
+ histogram[i] = 0;
+ }
+ float4 max_px;
+ int max = 0;
+ for( int y = yc - 4; y < yc + 4; ++y)
+ {
+ for( int x = xc - 4; x < xc + 4; ++x)
+ {
+ float4 px = img.sampleNearest( float2(x,y ) );
+ int hv = ++histogram[ intensity( px ) ];
+ if( hv > max )
+ {
+ max_px = px;
+ max = hv;
+ }
+ }
+ }
+ result = max_px;
+ }
+ region changed(region changed_input_region, int input_index, region input_DOD[])
+ {
+ return changed_input_region;
+ }
+}
Property changes on: trunk/shiva-collections/filters/oilify.shiva
___________________________________________________________________
Name: svn:mergeinfo
+
Copied: trunk/shiva-collections/generators/MandelbrotSet.shiva (from rev 560, trunk/OpenGTL/OpenShiva/tests/imagegenerators/MandelbrotSet.shiva)
===================================================================
--- trunk/shiva-collections/generators/MandelbrotSet.shiva (rev 0)
+++ trunk/shiva-collections/generators/MandelbrotSet.shiva 2009-03-12 16:57:55 UTC (rev 597)
@@ -0,0 +1,47 @@
+kernel MandelbrotSet
+{
+ void evaluatePixel(out pixel result)
+ {
+ // Parameters
+ float xaxis = 700.0;
+ float yaxis = 500.0;
+ float scale = 1 / 400.0;
+ int max_iteration = 25;
+ // Do it
+ float x = (result.coord[0] - xaxis) * scale;
+ float x0 = x;
+ float y = (result.coord[1] - yaxis) * scale;
+ float y0 = y;
+
+ int iteration = 0;
+ while( (x*x + y*y) <= (2*2) and iteration < max_iteration)
+ {
+ float xtemp = x*x - y*y + x0;
+ y = 2*x*y + y0;
+ x = xtemp;
+ ++iteration;
+ }
+ int v = (765 * iteration)/max_iteration;
+ if( iteration == max_iteration)
+ {
+ result[0] = 0.0;
+ result[1] = 0.0;
+ result[2] = 0.0;
+ } if ( v >= 510 )
+ {
+ result[0] = 1.0;
+ result[1] = 1.0;
+ result[2] = (v - 510 ) / 255.0;
+ }
+ else if( v > 255 )
+ {
+ result[0] = 1.0;
+ result[1] = 1.0;
+ result[2] = (v - 255) / 255.0;
+ } else {
+ result[0] = v;
+ result[1] = 0.0;
+ result[2] = 0.0;
+ }
+ }
+}
Property changes on: trunk/shiva-collections/generators/MandelbrotSet.shiva
___________________________________________________________________
Name: svn:mergeinfo
+
Copied: trunk/shiva-collections/generators/PerlinNoise.shiva (from rev 591, trunk/OpenGTL/OpenShiva/tests/imagegenerators/PerlinNoise.shiva)
===================================================================
--- trunk/shiva-collections/generators/PerlinNoise.shiva (rev 0)
+++ trunk/shiva-collections/generators/PerlinNoise.shiva 2009-03-12 16:57:55 UTC (rev 597)
@@ -0,0 +1,129 @@
+<
+ parameters: <
+ amount: <
+ label: "Amount";
+ type: float;
+ >;
+ offset: <
+ label: "Offset";
+ type: float;
+ >;
+ factor: <
+ label: "Factor";
+ type: float;
+ defaultValue: 1.0;
+ maxValue: 10.0;
+ >;
+ xscale: <
+ label: "Horizontal scale";
+ type: float;
+ defaultValue: 4.0;
+ maxValue: 100.0;
+ >;
+ yscale: <
+ label: "Vertical scale";
+ type: float;
+ defaultValue: 4.0;
+ maxValue: 100.0;
+ >;
+ octaves: <
+ label: "Octaves";
+ type: int;
+ defaultValue: 2;
+ maxValue:10;
+ >;
+ width: <
+ label: "Image width";
+ type: int;
+ defaultValue: 800;
+ maxValue:10000;
+ >;
+ height: <
+ label: "Image height";
+ type: int;
+ defaultValue: 600;
+ maxValue:10000;
+ >;
+ >;
+>;
+kernel PerlinNoise
+{
+ const int RAND_MAX = 2147483647;
+
+ dependent float grad_x[64];
+ dependent float grad_y[64];
+ dependent int permutation[64];
+
+ float fade(float t)
+ {
+ return ((2.0*fabs(t)-3.0)*(t)*(t)+1.0);
+ }
+
+ // Pregenerate grad_x, grad_y and permuation
+ void evaluateDependents()
+ {
+ // Init permutations
+ for(int i = 0; i < 64; ++i)
+ {
+ permutation[i] = i;
+ }
+ for (int i = 0; i < 1000; ++i) {
+ int j = rand() % 64;
+ int k = rand() % 64;
+ int t = permutation[j];
+ permutation[j] = permutation[k];
+ permutation[k] = t;
+ }
+ // Initialize the gradient table
+ for(int i = 0; i < 64; ++i)
+ {
+ grad_x[i] = rand() / float(RAND_MAX) - 0.5;
+ grad_y[i] = rand() / float(RAND_MAX) - 0.5;
+ float norm = 1.0 / sqrt(grad_x[i] * grad_x[i] + grad_y[i] * grad_y[i]);
+ grad_x[i] *= norm;
+ grad_y[i] *= norm;
+ }
+ }
+
+ void evaluatePixel(out pixel4 result)
+ {
+ float total = 0.0;
+ int frequency = 1;
+ float x = (result.coord.x ) / float(width);
+ float y = (result.coord.y ) / float(height);
+ x *= xscale;
+ y *= yscale;
+ for(int oct = 0; oct < octaves; ++oct)
+ {
+ float xs = x * frequency;
+ float ys = y * frequency;
+ int xs_frac = int(xs);
+ int ys_frac = int(ys);
+ float intermtotal = 0.0;
+ for(int i = 0; i < 2; ++i)
+ {
+ for(int j = 0; j < 2; ++j)
+ {
+ int n = permutation[(xs_frac + i + permutation[(ys_frac + j) % 64]) % 64];
+ float vx = xs - xs_frac - i;
+ float vy = ys - ys_frac - j;
+ intermtotal += fade(vx) * fade(vy) * (grad_x[n] * vx + grad_y[n] * vy );
+ }
+ }
+
+ total += intermtotal / frequency;
+ frequency *= 2;
+ }
+ total += offset;
+ total *= factor;
+ if( total > 1.0) total = 1.0;
+ if( total < 0) total = 0;
+ result = float4(total,total,total,1.0);
+ }
+
+ region generated()
+ {
+ region reg1 = { 0, 0, 800, 600 };
+ return reg1;
+ }
+}
Property changes on: trunk/shiva-collections/generators/PerlinNoise.shiva
___________________________________________________________________
Name: svn:mergeinfo
+