effect_particle_fire.frag

///////////////////////////////////////////////////////
//*-------------------------------------------------*//
//| Part of Project One (https://www.maus-games.at) |//
//*-------------------------------------------------*//
//| Copyright (c) 2010 Martin Mauersics             |//
//| Released under the zlib License                 |//
//*-------------------------------------------------*//
///////////////////////////////////////////////////////


// shader input
flat varying vec2 v_v2Time;   // current simulation times (from 0.0 to 1.0)


void FragmentMain()
{
    // interpolate texture flipped over time
    float v1Value = mix(coreTexture2D(0, v_av2TexCoord[0]).r,
                        coreTexture2D(0, v_av2TexCoord[1]).r, v_v2Time.x) * 1.2 * smoothstep(0.0, 0.3, u_v4Color.a);

    // draw as alpha map
    gl_FragColor = vec4(u_v4Color.rgb, v1Value * (u_v4Color.a * u_v4Color.a) * v_v2Time.y);
}