Shader

#version 120

#define MAX_NUM_CAMS 8
varying vec3 location;
varying vec3 location_obj;
uniform mat4 viewMat;
uniform int numCameras;
uniform sampler2D texSampler[MAX_NUM_CAMS];
uniform sampler2D weightSampler[MAX_NUM_CAMS];

void main()
{
	int i;
	float sumw = 0.0;
	float camw[MAX_NUM_CAMS];
	vec3 colour = vec3(0,0,0);
	vec4 p = vec4(location, 1.0);
    vec4 p_obj = vec4(location_obj, 1.0);
    vec4 tc = viewMat * p_obj;
    i = 0;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[0],tc).r;
			sumw += camw[i];
		}
    i = 1;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[1],tc).r;
			sumw += camw[i];
		}
    i = 2;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[2],tc).r;
			sumw += camw[i];
		}
    i = 3;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[3],tc).r;
			sumw += camw[i];
		}
    i = 4;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[4],tc).r;
			sumw += camw[i];
		}
    i = 5;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[5],tc).r;
			sumw += camw[i];
		}
    i = 6;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[6],tc).r;
			sumw += camw[i];
		}
    i = 7;
		camw[i]=0.0;
		if (i<numCameras)
		{
			camw[i] = texture2DProj(weightSampler[7],tc).r;
			sumw += camw[i];
		}
	i = 0;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[0],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 1;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[1],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 2;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[2],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 3;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[3],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 4;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[4],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 5;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[5],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 6;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[6],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	i = 7;
		if (i<numCameras && sumw>0.0)
		{
			vec4 texCoord = gl_TextureMatrix[i] * p;
			vec4 texColour = texture2DProj(texSampler[7],texCoord);
			float w = camw[i] / sumw;
			if (w>1.0) w = 1.0;
			colour += texColour.rgb*w;
		}
	if (sumw==0.0) discard;
	//colour = colour*0.5;
	gl_FragColor = vec4(colour, 0.5);
	//gl_FragData[0] = vec4(colour, 0.5);
	//gl_FragData[1] = vec4(colour, 0.5);
}