downsampletiltshift.frag

Enable keyboard shortcuts

VARYING vec2 TexCoord0;

VARYING vec2 TexCoord1;

VARYING vec2 TexCoord2;

VARYING vec2 TexCoord3;

float advancedGetTiltShiftMultiplier(vec2 inTexCoord, float inFocusBarHeight, float inFocusWidth,

                                     bool inVertical, bool inInvert)

    float texPos = inVertical ? inTexCoord.x : 0.5 + (inTexCoord.y - 0.5) * (-FRAMEBUFFER_Y_UP);

    float focusDiff = max(0.0, abs(texPos - inFocusBarHeight) - (inFocusWidth / 2.0))

            / inFocusWidth;

    float retval = clamp(focusDiff, 0.0, 1.0);

    return inInvert ? 1.0 - retval : retval;

vec4 advancedBoxTiltShiftBlur(sampler2D inBlurSampler,

                              float inFocusBarHeight, float inFocusWidth,

                              bool inVertical, bool inInvert)

    float mult0 = .25 * advancedGetTiltShiftMultiplier(TexCoord0, inFocusBarHeight, inFocusWidth,

                                                       inVertical, inInvert);

    float mult1 = .25 * advancedGetTiltShiftMultiplier(TexCoord1, inFocusBarHeight, inFocusWidth,

                                                       inVertical, inInvert);

    float mult2 = .25 * advancedGetTiltShiftMultiplier(TexCoord2, inFocusBarHeight, inFocusWidth,

                                                       inVertical, inInvert);

    float mult3 = .25 * advancedGetTiltShiftMultiplier(TexCoord3, inFocusBarHeight, inFocusWidth,

                                                       inVertical, inInvert);

    float multTotal = mult0 + mult1 + mult2 + mult3;

    float totalDivisor = multTotal != 0.0 ? 1.0 / multTotal : 0.0;

    vec4 outCol = texture(inBlurSampler, TexCoord0) * mult0;

    outCol += texture(inBlurSampler, TexCoord1) * mult1;

    outCol += texture(inBlurSampler, TexCoord2) * mult2;

    outCol += texture(inBlurSampler, TexCoord3) * mult3;

    return outCol * totalDivisor;

void MAIN()

    FRAGCOLOR = advancedBoxTiltShiftBlur(INPUT, focusPosition, focusWidth, isVertical, isInverted);