From 3bf9df6b2785fa6d951086978a3e66f49427166a Mon Sep 17 00:00:00 2001
From: FluorescentCIAAfricanAmerican <0934gj3049fk@protonmail.com>
Date: Wed, 22 Apr 2020 12:56:21 -0400
Subject: 1

---
 utils/Texturesynth/tsynth.cpp | 102 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 utils/Texturesynth/tsynth.cpp

(limited to 'utils/Texturesynth/tsynth.cpp')

diff --git a/utils/Texturesynth/tsynth.cpp b/utils/Texturesynth/tsynth.cpp
new file mode 100644
index 0000000..86a634e
--- /dev/null
+++ b/utils/Texturesynth/tsynth.cpp
@@ -0,0 +1,102 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#include "tier0/platform.h"
+#include "bitmap/float_bm.h"
+#include "mathlib/mathlib.h"
+#include "tier2/tier2.h"
+#include "bitmap/tgaloader.h"
+
+#define NEIGHBORHOOD_SIZE 5
+
+void SynthesizeTexture(FloatBitMap_t & output, FloatBitMap_t const & input)
+{
+	// init output with histogram-equalized random pixels
+	output.InitializeWithRandomPixelsFromAnotherFloatBM(input);
+
+	// build image pyramids
+	FloatImagePyramid_t input_pyramid(input,PYRAMID_MODE_GAUSSIAN);
+	FloatImagePyramid_t output_pyramid(output,PYRAMID_MODE_GAUSSIAN);
+
+	// now, synthesize texture from lowest res to highest
+	for(int level=min(input_pyramid.m_nLevels,output_pyramid.m_nLevels)-2;level>=0;level--)
+	{
+		FloatBitMap_t & output=*(output_pyramid.Level(level));
+		FloatBitMap_t & output0=*(output_pyramid.Level(level+1));
+		FloatBitMap_t & input=*(input_pyramid.Level(level));
+		FloatBitMap_t & input0=*(input_pyramid.Level(level+1));
+		if ( 
+			(input.Width < NEIGHBORHOOD_SIZE*3) ||
+			(input.Height < NEIGHBORHOOD_SIZE*3)
+			)
+		{
+			printf("skip level %d\n",level);
+			continue;
+		}
+		// now, synthesize each pixel
+		for(int yloop=0;yloop<output.Height;yloop++)
+		{
+			int yo=((yloop+NEIGHBORHOOD_SIZE) % output.Height);
+			printf("level %d line %d\n",level,yo);
+			for(int xo=0;xo<output.Width;xo++)
+			{
+				int best_pixel_x=-1, best_pixel_y=-1;
+				float best_error=1.0e22;
+				// traverse all neighborhoods of src
+				for(int nblk_y=NEIGHBORHOOD_SIZE;nblk_y<input.Height;nblk_y++)
+					for(int nblk_x=NEIGHBORHOOD_SIZE;nblk_x<input.Width-NEIGHBORHOOD_SIZE;nblk_x++)
+					{
+						float our_error=0;
+						// now, compare this block to the neighborhood around our output pixel
+						for(int oy=-NEIGHBORHOOD_SIZE;oy<=0;oy++)
+						{
+							int xlimit=NEIGHBORHOOD_SIZE/2;
+							if (oy==0)
+								xlimit=-1;					// on last line, don't step past our output pixel
+							for(int ox=-NEIGHBORHOOD_SIZE/2;ox<=xlimit;ox++)
+								for(int c=0;c<3;c++)
+								{
+									float pix_diff=
+										output.PixelWrapped(xo+ox,yo+oy,c)-
+										input.Pixel(nblk_x+ox,nblk_y+oy,c);
+									our_error+=pix_diff*pix_diff;
+									float pix_diff0=
+										output0.PixelWrapped(xo+ox,yo+oy,c)-
+										input0.PixelClamped(nblk_x+ox,nblk_y+oy,c);
+									our_error+=pix_diff0*pix_diff0;
+								}
+						}
+						if (our_error < best_error)
+						{
+							best_pixel_x=nblk_x;
+							best_pixel_y=nblk_y;
+							best_error=our_error;
+						}
+					}
+				for(int c=0;c<3;c++)
+					output.Pixel(xo,yo,c)=input.Pixel(best_pixel_x,best_pixel_y,c);
+			}
+		}
+	}
+	output_pyramid.WriteTGAs("synth_out");
+}
+
+
+
+void main(int argc,char **argv)
+{
+	InitCommandLineProgram( argc, argv );
+	FloatBitMap_t src_texture(argv[1]);
+
+	int out_width = atoi( argv[2] );
+	int out_height = atoi( argv[3] );
+
+
+	FloatBitMap_t output_map(out_width,out_height);
+
+	SynthesizeTexture(output_map,src_texture);
+
+}
-- 
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