/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include "particle_common.cg"

#ifdef USE_TIME_SERIES
#define LEVEL1 0.5
#define LEVEL2 0.4
#else
#define LEVEL1 0.7
#define LEVEL2 0.5
#endif

float4 fpmain(float2 texCoord : TEXCOORD0,
              float3 color : COLOR, 
              float2 center : TEXCOORD2,
              float4 rotation : TEXCOORD3,
              float skip : TEXCOORD4,
              float mag : TEXCOORD5,
              float zValue : TEXCOORD6,
              uniform sampler2D arrows : register(s0)) : COLOR
{
    if (skip > 0.5) {
        discard;
    }

    float2 newTexCoord = float2((texCoord.x - 0.5) / NUM_SUBIMAGE_X, (texCoord.y - 0.5) / NUM_SUBIMAGE_Y);
    float2 rotTexCoord;
    rotTexCoord.x = rotation.x * newTexCoord.x + rotation.y * newTexCoord.y;
    rotTexCoord.y = rotation.z * newTexCoord.x + rotation.w * newTexCoord.y;
    rotTexCoord.x = rotTexCoord.x + 0.5 / NUM_SUBIMAGE_X;
    rotTexCoord.y = rotTexCoord.y + 0.5 / NUM_SUBIMAGE_Y;
    rotTexCoord = rotTexCoord + center;
    float4 refColor;
#ifdef USE_J_WIRE	
    if (mag > 0.2)
        refColor = float4(1, 0, 0, 1.0);
    else if (mag > 0.1)
        refColor = float4(1, 1, 0, 0.3);
    else
        refColor = float4(1, 1, 1, 0.3);
#else
    if (mag > LEVEL1)
        refColor = float4(1, 0, 0, 1.0);
    //refColor = float4(1, 0, 0, 1.0 * (3.0 + zValue) / 3);
    else if (mag > LEVEL2)
        refColor = float4(1, 1, 0, 0.3);
    //refColor = float4(1, 1, 0, 1.0);
    else
        refColor = float4(0.5, 0.5, 0.5, 0.2);
    //refColor = float4(0.5, 0.5, 0.5, 1.0);
#endif
    float4 arrowc = tex2D(arrows, rotTexCoord.xy);
    float4 c = float4(arrowc.xyz, ((arrowc.w == 1.0)? 1 : 0));
    //float4 c = float4(arrowc.xyz, ((arrowc.w != 0.0)? 1 : 0));
	
    return c * refColor;
}