#include "PipelineMerger.hpp"

const double PipelineMerger::e(2.71828182845904523536);
const double PipelineMerger::s(0.5);

void PipelineMerger::mergePipelines(const Pipeline & a, const Pipeline & b, Pipeline & out, float ratio)

{

    const double invratio = 1.0 - ratio;

	out.textureWrap = ( ratio < 0.5 ) ? a.textureWrap : b.textureWrap;

	out.screenDecay = lerp ( b.screenDecay, a.screenDecay, ratio );

	out.drawables.clear();
	out.compositeDrawables.clear();

	for ( std::vector<RenderItem*>::const_iterator pos = a.drawables.begin();
	        pos != a.drawables.end(); ++pos )
	{
		( *pos )->masterAlpha = invratio;
		out.drawables.push_back ( *pos );
	}

	for ( std::vector<RenderItem*>::const_iterator pos = b.drawables.begin();
	        pos != b.drawables.end();++pos )
	{
		( *pos )->masterAlpha = ratio;
		out.drawables.push_back ( *pos );
	}

    if(ratio < 0.5)
    {
        const double local_ratio = (invratio - 0.5) * 2;

        for (std::vector<RenderItem*>::const_iterator pos = a.compositeDrawables.begin();
        pos != a.compositeDrawables.end(); ++pos)
        {
            (*pos)->masterAlpha = local_ratio;
            out.compositeDrawables.push_back(*pos);
        }
    }
    else
    {
        const double local_ratio = (ratio - 0.5) * 2;

        for (std::vector<RenderItem*>::const_iterator pos = b.compositeDrawables.begin();
        pos != b.compositeDrawables.end();++pos)
        {
            (*pos)->masterAlpha = local_ratio;
            out.compositeDrawables.push_back(*pos);
        }
    }

	if (a.staticPerPixel && b.staticPerPixel)
	{
		out.staticPerPixel = true;
		 for (int x=0;x<a.gx;x++)
		    {
		      for(int y=0;y<a.gy;y++)
			{
			  out.x_mesh[x][y]  = a.x_mesh[x][y]* invratio + b.x_mesh[x][y]*ratio;
			}
		    }
		 for (int x=0;x<a.gx;x++)
		    {
		      for(int y=0;y<a.gy;y++)
			{
			  out.y_mesh[x][y]  = a.y_mesh[x][y]* invratio + b.y_mesh[x][y]*ratio;
			}
		    }
	}

    if(ratio < 0.5)
    {
        out.compositeShader = a.compositeShader;
        out.warpShader = a.warpShader;
        out.warpShaderFilename = a.warpShaderFilename;
        out.compositeShaderFilename = a.compositeShaderFilename;
    }
    else
    {
        out.compositeShader = b.compositeShader;
        out.warpShader = b.warpShader;
        out.warpShaderFilename = b.warpShaderFilename;
        out.compositeShaderFilename = b.compositeShaderFilename;
    }
}