Start adding support cone maps.

src/nvimage/ConeMap.cpp

@@ -0,0 +1,122 @@
+// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
+// 
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#include <nvcore/Ptr.h>
+
+#include <nvmath/Color.h>
+
+#include <nvimage/NormalMap.h>
+#include <nvimage/Filter.h>
+#include <nvimage/FloatImage.h>
+#include <nvimage/Image.h>
+
+using namespace nv;
+
+
+static float processPixel(const FloatImage * img, uint x, uint y)
+{
+	nvDebugCheck(img != NULL);
+	
+	const uint w = img->width();
+	const uint h = img->height();
+	
+	float d = img->pixel(x, y, 0);
+	
+	float fx0 = (float) x / w;
+	float fy0 = (float) y / h;
+
+	float best_ratio = INF;
+	uint best_x = w;
+	uint best_y = h;
+	
+	for (uint yy = 0; yy < h; yy++)
+	{
+		for (uint xx = 0; xx < w; xx++)
+		{
+			float ch = d - img->pixel(xx, yy, 0);
+			
+			if (ch > 0)
+			{
+				float dx = float(xx - x);
+				float dy = float(yy - y);
+				
+				float ratio = (dx * dx + dy * dy) / ch;
+				
+				if (ratio < best_ratio)
+				{
+					best_x = xx;
+					best_y = yy;
+				}
+			}
+		}
+	}
+
+	if (best_x != w)
+	{
+		nvDebugCheck(best_y !=h);
+		
+		float dx = float(best_x - x) / w;
+		float dy = float(best_y - y) / h;
+		
+		float cw = sqrtf(dx*dx + dy*dy);
+		float ch = d - img->pixel(xx, yy, 0);
+		
+		return min(1, sqrtf(cw / ch));
+	}
+	
+	return 1;
+}
+
+
+// Create cone map using the given kernels.
+FloatImage * createConeMap(const Image * img, Vector4::Arg heightWeights)
+{
+	nvCheck(img != NULL);
+	
+	const uint w = img->width();
+	const uint h = img->height();
+	
+	AutoPtr<FloatImage> fimage(new FloatImage());
+	//fimage->allocate(2, w, h);
+	fimage->allocate(4, w, h);
+	
+	// Compute height and store in red channel:
+	float * heightChannel = fimage->channel(0);
+	for(uint i = 0; i < w*h; i++)
+	{
+		Vector4 color = toVector4(img->pixel(i));
+		heightChannel[i] = dot(color, heightWeights);
+	}
+	
+	// Compute cones:
+	for(uint y = 0; y < h; y++)
+	{
+		for(uint x = 0; x < w; x++)
+		{
+			processPixel(fimage, x, y);
+		}
+	}
+	
+	return fimage.release();
+}
+

src/nvimage/ConeMap.h

@@ -0,0 +1,39 @@
+// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
+// 
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef NV_IMAGE_CONEMAP_H
+#define NV_IMAGE_CONEMAP_H
+
+#include <nvmath/Vector.h>
+#include <nvimage/nvimage.h>
+
+namespace nv
+{
+	class Image;
+	class FloatImage;
+
+	FloatImage * createConeMap(const Image * img, Vector4::Arg heightWeights);
+
+} // nv namespace
+
+#endif // NV_IMAGE_CONEMAP_H