source: branches/blt4/packages/vizservers/nanovis/shaders/velocityslicefp.cg @ 2936

/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */

#include "particle_common.cg"

float4 fpmain(float2 texCoord : TEXCOORD0,
              float3 color : COLOR, 
              float2 center : TEXCOORD2,
              float4 rotation : TEXCOORD3,
              uniform sampler2D arrows : register(s0)) : COLOR
{
    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;

    return float4(tex2D(arrows, rotTexCoord.xy).xyz * color, 1.0);
}