spark/src/shaders/computeVec4.glsl

precision highp float;
precision highp int;
precision highp sampler2D;
precision highp usampler2D;
precision highp isampler2D;
precision highp sampler2DArray;
precision highp usampler2DArray;
precision highp isampler2DArray;
precision highp sampler3D;
precision highp usampler3D;
precision highp isampler3D;

#include <splatDefines>

uniform uint targetLayer;
uniform int targetBase;
uniform int targetCount;

out vec4 target;

{{ GLOBALS }}

void computeReadback(int index) {
    {{ STATEMENTS }}
}

void main() {
    int targetIndex = int(targetLayer << SPLAT_TEX_LAYER_BITS) + int(uint(gl_FragCoord.y) << SPLAT_TEX_WIDTH_BITS) + int(gl_FragCoord.x);
    int index = targetIndex - targetBase;

    if ((index >= 0) && (index < targetCount)) {
        computeReadback(index);
    } else {
        target = vec4(0.0, 0.0, 0.0, 0.0);
    }
}