Function getPickerFragmentShader

source/MRViewer/MRShaderBlocks.cpp:7–48

{

std::string getPickerFragmentShader( bool points, bool cornerMode )
{
    const std::string head =
        MR_GLSL_VERSION_LINE R"(
            precision highp float;
            precision highp int;
  uniform bool useClippingPlane;
  uniform vec4 clippingPlane;
  uniform uint uniGeomId;

  in vec3 world_pos;
  
  in float primitiveIdf0;
  in float primitiveIdf1;

  out highp uvec4 color;
)";

    const std::string primId =
        cornerMode ? R"(
    uint primitiveId = ( uint(primitiveIdf1) << 20u ) + uint(primitiveIdf0);
)" : R"(
    uint primitiveId = uint(gl_PrimitiveID);
)";

    const std::string tail = R"(
    color.r = primitiveId;

    color.g = uniGeomId;

    color.a = uint(gl_FragCoord.z * 4294967295.0);
)";

    return
        head +
        getShaderMainBeginBlock( false ) +
        ( points ? getFragmentShaderPointSizeBlock() : R"()" ) +
        getFragmentShaderClippingBlock() +
        primId +
        tail +
        getFragmentShaderEndBlock( ShaderTransparencyMode::None );
}

std::string getFragmentShaderClippingBlock()
{